UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ		QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

o		TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 000-50633

CYTOKINETICS, INCORPORATED

Delaware (State or other jurisdiction of incorporation or organization)		94-3291317 (I.R.S. Employer Identification Number)
280 East Grand Avenue South San Francisco, California (Address of principal executive offices)		94080 (Zip Code)

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ No o

     Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).* Yes o No o

*        The registrant has not yet been phased into the interactive data requirements.

     Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer o		Accelerated filer þ		Non-accelerated filer o (Do not check if a smaller reporting company)		Smaller reporting company o

     Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

     Number of shares of common stock, $0.001 par value, outstanding as of October 30, 2009: 60,929,626.

 

 

CYTOKINETICS, INCORPORATED
TABLE OF CONTENTS FOR FORM 10-Q
FOR THE QUARTER ENDED SEPTEMBER 30, 2009

		Page
PART I. FINANCIAL INFORMATION			3
Item 1. Financial Statements			3
Unaudited Condensed Balance Sheets as of September 30, 2009 and December 31, 2008			3
Unaudited Condensed Statements of Operations for the three and nine months ended September 30, 2009 and 2008, and the period from August 5, 1997 (date of inception) to September 30, 2009			4
Unaudited Condensed Statements of Cash Flows for the nine months ended September 30, 2009 and 2008, and the period from August 5, 1997 (date of inception) to September 30, 2009			5
Notes to Unaudited Condensed Financial Statements			6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations			17
Item 3. Quantitative and Qualitative Disclosures About Market Risk			33
Item 4. Controls and Procedures			33
PART II. OTHER INFORMATION			33
Item 1. Legal Proceedings			33
Item 1A. Risk Factors			33
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds			50
Item 3. Defaults Upon Senior Securities			50
Item 4. Submission of Matters to a Vote of Security Holders			50
Item 5. Other Information			50
Item 6. Exhibits			51
SIGNATURES			52
EXHIBIT INDEX			53
Exhibit 31.1
Exhibit 31.2
Exhibit 32.1

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

CYTOKINETICS, INCORPORATED
(A Development Stage Enterprise)

CONDENSED BALANCE SHEETS
(In thousands, except share and per share data)
(Unaudited)

		September 30,				December 31,
		2009				2008
ASSETS
Current assets:
Cash and cash equivalents		$	23,715			$	41,819
Short-term investments			79,723				15,048
Investments in auction rate securities			15,782				—
Investment put option related to auction rate securities rights			2,368				—
Related party accounts receivable			4,544				221
Related party notes receivable — short-term portion			9				40
Prepaid and other current assets			2,010				1,782
Total current assets			128,151				58,910
Investments in auction rate securities			—				16,636
Investment put option related to auction rate securities rights			—				3,389
Property and equipment, net			3,865				5,087
Assets held-for-sale			178				325
Related party notes receivable — long-term portion			—				9
Restricted cash			1,674				2,750
Other assets			296				348
Total assets		$	134,164			$	87,454
LIABILITIES and STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable		$	1,349			$	1,382
Accrued liabilities			6,207				7,174
Related party payables and accrued liabilities			10				—
Short-term portion of equipment financing lines			1,725				2,025
Short-term portion of deferred revenue			708				12,296
Loan with UBS			10,470				—
Total current liabilities			20,469				22,877
Long-term portion of equipment financing lines			1,338				2,615
Long-term portion of deferred revenue			—				12,196
Total liabilities			21,807				37,688
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value:
Authorized: 170,000,000 shares; Issued and outstanding: 60,908,591 shares at September 30, 2009 and 49,939,069 shares at December 31, 2008			61				50
Additional paid-in capital			411,106				385,605
Accumulated other comprehensive income			24				18
Deficit accumulated during the development stage			(298,834	)			(335,907	)
Total stockholders’ equity			112,357				49,766
Total liabilities and stockholders’ equity		$	134,164			$	87,454

The accompanying notes are an integral part of these financial statements.

CYTOKINETICS, INCORPORATED
(A Development Stage Enterprise)

CONDENSED STATEMENTS OF OPERATIONS
(In thousands, except per share data)
(Unaudited)

																		Period from
																		August 5, 1997
		Three Months Ended								Nine Months Ended								(Date of Inception)
		September 30,				September 30,				September 30,				September 30,				to September 30,
		2009				2008				2009				2008				2009
Revenues:
Research and development revenues from related party		$	5,506			$	67			$	6,148			$	93			$	46,587
Research and development, grant and other revenues			—				—				—				—				2,955
License revenues from related parties			—				3,058				74,367				9,175				112,935
Total revenues			5,506				3,125				80,515				9,268				162,477
Operating expenses:
Research and development			9,857				13,519				30,018				42,480				367,456
General and administrative			3,878				3,826				12,025				12,235				112,561
Restructuring charges (reversals)			(21	)			2,492				(23	)			2,492				2,451
Total operating expenses			13,714				19,837				42,020				57,207				482,468
Operating income (loss)			(8,208	)			(16,712	)			38,495				(47,939	)			(319,991	)
Interest and other, net			6				453				(1,422	)			2,421				21,157
Net income (loss)		$	(8,202	)		$	(16,259	)		$	37,073			$	(45,518	)		$	(298,834	)
Net income (loss) per common share:
Basic		$	(0.14	)		$	(0.33	)		$	0.66			$	(0.92	)
Diluted			(0.14	)		$	(0.33	)		$	0.65			$	(0.92	)
Weighted-average number of shares used in computing net income (loss) per common share:
Basic			60,502				49,416				56,212				49,359
Diluted			60,502				49,416				56,697				49,359

The accompanying notes are an integral part of these financial statements.

CYTOKINETICS, INCORPORATED
(A Development Stage Enterprise)

CONDENSED STATEMENTS OF CASH FLOWS

(In thousands)
(Unaudited)

										Period from
										August 5, 1997
		Nine Months Ended								(date of inception)
		September 30,				September 30,				to September 30,
		2009				2008				2009
Cash flows from operating activities:
Net income (loss)		$	37,073			$	(45,518	)		$	(298,834	)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment			1,527				1,893				24,972
(Gain) loss on disposal of property and equipment			(48	)			—				303
Non-cash restructuring expenses, net of reversals			22				840				364
Non-cash interest expense			—				69				504
Non-cash forgiveness of loan to officer			10				11				425
Stock-based compensation			3,734				4,309				24,087
Non-cash warrant expense			1,585				—				1,626
Other non-cash expenses			—				7				141
Changes in operating assets and liabilities:
Related party accounts receivable			(4,323	)			8				(4,895	)
Prepaid and other assets			(176	)			(43	)			(2,334	)
Accounts payable			97				(252	)			1,485
Accrued liabilities			(965	)			(392	)			6,151
Related party payables and accrued liabilities			10				(12	)			10
Deferred revenue			(23,784	)			(9,176	)			708
Net cash provided by (used in) operating activities			14,762				(48,256	)			(245,287	)
Cash flows from investing activities:
Purchases of investments			(98,723	)			(9,400	)			(768,088	)
Proceeds from sales and maturities of investments			35,929				12,576				670,322
Purchases of property and equipment			(339	)			(638	)			(29,889	)
Proceeds from sale of property and equipment			74				—				124
(Increase) decrease in restricted cash			1,076				2,417				(1,674	)
Issuance of related party notes receivable			—				—				(1,146	)
Proceeds from payments of related party notes receivable			30				130				859
Net cash provided by (used in) investing activities			(61,953	)			5,085				(129,492	)
Cash flows from financing activities:
Proceeds from initial public offering, sale of common stock to related party, and public offerings, net of issuance costs			12,938				—				206,872
Proceeds from draw down of Committed Equity Financing Facility, net of issuance costs			6,850				—				38,896
Proceeds from other issuances of common stock			406				391				6,563
Proceeds from issuance of preferred stock, net of issuance costs			—				—				133,172
Repurchase of common stock			—				—				(68	)
Proceeds from loan with UBS			12,441				—				12,441
Repayment of loan with UBS			(1,971	)			—				(1,971	)
Proceeds from equipment financing lines			—				—				23,696
Repayment of equipment financing lines			(1,577	)			(3,148	)			(21,107	)
Net cash provided by (used in) financing activities			29,087				(2,757	)			398,494
Net increase (decrease) in cash and cash equivalents			(18,104	)			(45,928	)			23,715
Cash and cash equivalents, beginning of period			41,819				116,564				—
Cash and cash equivalents, end of period		$	23,715			$	70,636			$	23,715

The accompanying notes are an integral part of these financial statements.

CYTOKINETICS, INCORPORATED

(A DEVELOPMENT STAGE ENTERPRISE)

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

Note 1. Organization and Summary of Significant Accounting Policies

Overview

     Cytokinetics, Incorporated (the “Company”, “we” or “our”) was incorporated under the laws of the state of Delaware on August 5, 1997. The Company is a clinical-stage biopharmaceutical company focused on the discovery and development of novel small molecule therapeutics that modulate muscle function for the potential treatment of serious diseases and medical conditions. The Company is a development stage enterprise and has been primarily engaged in conducting research, developing drug candidates and technologies, and raising capital.

     The Company’s registration statement for its initial public offering (“IPO”) was declared effective by the Securities and Exchange Commission (“SEC”) on April 29, 2004. The Company’s common stock commenced trading on the NASDAQ National Market, now the NASDAQ Global Market, on April 29, 2004 under the trading symbol “CYTK”.

     The Company’s consolidated financial statements contemplate the conduct of the Company’s operations in the normal course of business. The Company has incurred an accumulated deficit since inception and there can be no assurance that the Company will attain profitability. The Company had net income of $37.1 million and net cash provided from operations of $14.8 million for the nine months ended September 30, 2009 and an accumulated deficit of approximately $298.8 million as of September 30, 2009. Cash, cash equivalents and short-term investments (excluding investments in auction rate securities and the investment put option related to the auction rate security rights) increased from $56.9 million at December 31, 2008 to $103.4 million at September 30, 2009. The Company anticipates it will continue to have operating losses and net cash outflows in future periods. If sufficient additional capital is not available on terms acceptable to the Company, its liquidity will be impaired.

     The Company has funded its operations primarily through sales of common stock and convertible preferred stock, contract payments under its collaboration agreements, debt financing arrangements, government grants and interest income. Until it achieves profitable operations, the Company intends to continue to fund operations through payments from strategic collaborations, additional sales of equity securities and debt financings. Based on the current status of its development plans, the Company believes that its existing cash, cash equivalents and short-term investments (excluding investments in auction rate securities) at September 30, 2009 will be sufficient to fund its cash requirements for at least the next 12 months. If, at any time, the Company’s prospects for financing its research and development programs decline, the Company may decide to reduce research and development expenses by delaying, discontinuing or reducing its funding of one or more of its research or development programs. Alternatively, the Company might raise funds through strategic relationships, public or private financings or other arrangements. Such funding, if needed, may not be available on favorable terms, or at all.

Basis of Presentation

     The accompanying unaudited condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The financial statements include all adjustments (consisting only of normal recurring adjustments) that management believes are necessary for the fair statement of the balances and results for the periods presented. These interim financial statement results are not necessarily indicative of results to be expected for the full fiscal year or any future interim period.

     The Company has evaluated subsequent events through November 5, 2009, the issuance date of the financial statements.

     The balance sheet at December 31, 2008 has been derived from the audited financial statements at that date. The financial statements and related disclosures have been prepared with the presumption that users of the interim financial statements have read or have access to the audited financial statements for the preceding fiscal year. Accordingly, these financial statements should be read in conjunction with the audited financial statements and notes thereto contained in the Company’s Form 10-K for the year ended December 31, 2008.

Comprehensive Income (Loss)

     Comprehensive income (loss) consists of the net income (loss) and other comprehensive income (loss). Other comprehensive income (loss) includes certain changes in stockholders’ equity that are excluded from net income (loss). Comprehensive net income (loss) and its components for the three and nine months ended September 30, 2009 and 2008 were as follows (in thousands):

		Three months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Net income (loss)		$	(8,202	)		$	(16,259	)		$	37,073			$	(45,518	)
Change in unrealized gain (loss) on investments			27				(519	)			6				(1,794	)
Comprehensive income (loss)		$	(8,175	)		$	(16,778	)		$	37,079			$	(47,312	)

Restricted Cash

     In accordance with the terms of the Company’s line of credit agreements with General Electric Capital Corporation, the Company is obligated to maintain a certificate of deposit with the lender. The balance of the certificate of deposit was $1.7 million at September 30, 2009 and $2.8 million at December 31, 2008, and was classified as restricted cash.

Fair Value of Financial Instruments

     The carrying amount of the Company’s cash and cash equivalents, accounts receivable, accounts payable and notes payable approximates the fair value due to the short-term nature of these instruments. The Company bases the fair value of short-term investments, other than auction rate securities (“ARS”) and the investment put option related to the Series C-2 Auction Rate Securities Rights issued to the Company by UBS AG (the “ARS Rights”), on current market prices and the fair value of ARS and the investment put option related to the ARS Rights using discounted cash flow models (Note 5). In connection with the failed auctions of the Company’s ARS, which were marketed and sold by UBS AG and its affiliates, in October 2008, the Company accepted a settlement with UBS AG pursuant to which UBS AG issued to the Company the ARS Rights. The carrying value of the investment put option related to the ARS Rights (Note 5) represents its fair value, based on the Black-Scholes option pricing model, which approximates the difference in value between the par value and the fair value of the associated ARS. As permitted under fair value accounting for financial instruments, the Company may elect fair value measurement for certain financial assets on a case by case basis. The Company has elected to use fair value measurement permitted under fair value accounting for the investment put option related to the ARS Rights.

Stock-Based Compensation

     The Company applies the accounting guidance for stock compensation, which establishes accounting for share-based payment awards made to employees and directors, including employee stock options and employee stock purchases. Under this guidance, stock-based compensation cost is measured at the grant date based on the calculated fair value of the award, and is recognized as an expense on a straight-line basis over the employee’s requisite service period, generally the vesting period of the award.

     The Company uses the Black-Scholes option pricing model to determine the fair value of stock options and employee stock purchase plan (“ESPP”) shares. The key input assumptions used to estimate the fair value of these awards include the exercise price of the award, the expected option term, the expected volatility of the Company’s stock over the option’s expected term, the risk-free interest rate over the option’s expected term and the Company’s expected dividend yield, if any.

     For employee stock options, the fair value of share-based payments was estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:

		Three Months Ended								Nine Months Ended
		September 30, 2009				September 30, 2008				September 30, 2009				September 30, 2008
Risk-free interest rate			2.78	%			3.54	%			2.69	%			2.98	%
Volatility			74	%			68	%			76	%			64	%
Expected term (in years)			6.13				6.12				6.07				6.08
Expected dividend yield			0.00	%			0.00	%			0.00	%			0.00	%

     For the ESPP, the fair value of share-based payments was estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:

		Three Months Ended								Nine Months Ended
		September 30, 2009				September 30, 2008				September 30, 2009				September 30, 2008
Risk-free interest rate			0.62	%			2.23	%			0.62	%			2.23	%
Volatility			75	%			67	%			75	%			67	%
Expected term (in years)			1.25				1.25				1.25				1.25
Expected dividend yield			0.00	%			0.00	%			0.00	%			0.00	%

     The risk-free interest rate that the Company uses in the option pricing model is based on the U.S. Treasury zero-coupon issues with

remaining terms similar to the expected terms of the options. The Company does not anticipate paying dividends in the foreseeable future and therefore uses an expected dividend yield of zero in the option pricing model. The Company is required to estimate forfeitures at the time of grant and revise those estimates in subsequent periods if actual forfeitures differ from those estimates. Historical data is used to estimate pre-vesting option forfeitures and record stock-based compensation expense only on those awards that are expected to vest.

     The Company used the simplified method of estimating the expected term for share-based compensation from January 1, 2006, the date it adopted the new share-based payment accounting guidance, through December 31, 2007. Starting January 1, 2008, the Company ceased to use the simplified method, and now uses its own historical exercise activity and extrapolates the life cycle of options outstanding to arrive at its estimated expected term for new option grants.

     From January 1, 2006 through December 31, 2007, the Company estimated the volatility of its common stock by using an average of historical stock price volatility of comparable companies due to the limited length of trading history. Starting January 1, 2008, the Company has used its own volatility history based on its stock’s trading history for the period subsequent to the Company’s IPO in April 2004. Because its outstanding options have an expected term of approximately six years, the Company supplements its own volatility history by using comparable companies’ volatility history for the relevant period preceding the Company’s IPO.

     The Company measures compensation expense for restricted stock awards at fair value on the date of grant and recognizes the expense over the expected vesting period. The fair value for restricted stock awards is based on the closing price of the Company’s common stock on the date of grant.

Note 2. Net Income (Loss) Per Common Share

     Basic net income (loss) per common share is computed by dividing net income (loss) by the weighted-average number of vested common shares outstanding during the period. Diluted net income (loss) per common share is computed by giving effect to all potentially dilutive common shares, including outstanding stock options, unvested restricted stock, warrants and shares issuable under the ESPP by applying the treasury stock method. The following is the calculation of basic and diluted net income (loss) per common share (in thousands, except per share data):

		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Net income (loss)		$	(8,202	)		$	(16,259	)		$	37,073			$	(45,518	)
Weighted-average common shares outstanding			60,829				49,416				56,583				49,359
Unvested restricted stock			(327	)			—				(371	)			—
Weighted-average shares used in computing net income (loss) per common share — basic			60,502				49,416				56,212				49,359
Dilutive effect of stock options and unvested restricted stock			—				—				485				—
Weighted-average shares used in computing net income (loss) per common share — basic			60,502				49,416				56,697				49,359
Net income (loss) per common share:
Basic		$	(0.14	)		$	(0.33	)		$	0.66			$	(0.92	)
Diluted		$	(0.14	)		$	(0.33	)		$	0.65			$	(0.92	)

     The following instruments were excluded from the computation of diluted net income (loss) per common share for the periods presented, because their effect would have been antidilutive (in thousands):

		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Options to purchase common stock			5,002				6,264				6,329				6,264
Warrants to purchase common stock			4,027				474				2,205				474
Shares issuable related to the ESPP			75				75				75				75
Total shares			9,104				6,813				8,609				6,813

Note 3. Supplemental Cash Flow Data

     Supplemental cash flow data was as follows (in thousands):

										Period from
										August 5, 1997
		Nine Months Ended								(date of inception)
		September 30,				September 30,				to September 30,
		2009				2008				2009
Significant non-cash investing and financing activities:
Deferred stock-based compensation		$	—			$	—			$	6,940
Purchases of property and equipment through accounts payable			62				5				62
Purchases of property and equipment through trade in value of disposed property and equipment			10				—				268
Penalty on restructuring of equipment financing lines			—				—				475
Conversion of convertible preferred stock to common stock			—				—				133,172

Note 4. Related Party Agreements

Research and Development Arrangements

     Amgen Inc. (“Amgen”). In May 2009, Amgen exercised its option under the 2006 collaboration and option agreement between the Company and Amgen (the “Amgen Agreement”) to obtain an exclusive, worldwide (excluding Japan) license to the Company’s cardiac muscle contractility program. The license includes omecamtiv mecarbil, formerly known as CK-1827452, a novel cardiac muscle myosin activator being developed for the potential treatment of heart failure. In connection with the exercise of the option, Amgen paid the Company a non-refundable option exercise fee of $50.0 million in June 2009. At that time, Amgen assumed responsibility for the development and commercialization of omecamtiv mecarbil and related compounds, at Amgen’s expense, subject to the Company’s specified development and commercial participation rights. Amgen’s license extends for the life of the intellectual property related to the cardiac muscle contractility program, and the Company has no further performance obligations related to research and development under the program, except as defined by the annual joint research and development plans as the parties may mutually agree. Accordingly, the Company recognized the $50.0 million option exercise fee as license revenue from related party in the three months ended June 30, 2009.

     Prior to Amgen’s payment of the option exercise fee in June 2009, the Company was amortizing the 2006 non-exclusive license and technology access fee from Amgen and related stock purchase premium over the maximum term of the non-exclusive license, which was four years. The non-exclusive license period ended upon the exercise of Amgen’s option in May 2009. The Company has no further performance obligations related to the non-exclusive license. Accordingly, the Company recognized as revenue the balance of the deferred Amgen revenue at the time Amgen exercised its option. The Company recognized zero and $74.4 million as revenue from related party in the three and nine months ended September 30, 2009, respectively, related to the Amgen 2006 non-exclusive license and technology access fee and stock purchase premium. In the three and nine months ended September 30, 2008, the Company recognized license revenue related to the Amgen non-exclusive license and technology access fee and stock purchase premium of $3.1 million and $9.2 million, respectively.

     Subsequent to Amgen obtaining the exclusive license to the cardiac muscle contractility program, the Company is providing research and development support of the program, as and when agreed to by both parties. Under the Amgen Agreement, Amgen reimburses the Company for such activities at predetermined rates per full-time employee equivalent (“FTE”), and for related out of pocket expenses at cost, including purchases of clinical trial material at manufacturing cost. The FTE rates are negotiated rates that approximate the Company’s costs, which the Company believes approximate fair value.

     In the third quarter of 2009, pursuant to the Amgen Agreement, the Company transferred to Amgen for $4.0 million the majority of the Company’s existing inventories of omecamtiv mecarbil and related reference materials. The $4.0 million purchase price was a negotiated price and represents the fair value of the materials transferred. The Company’s out of pocket costs for the transferred materials were incurred and recorded as research and development expense in prior periods.

     The Company recorded total research and development revenues under the Amgen Agreement of $5.5 million in the three months ended September 30, 2009, including $4.0 million for the material transferred and $1.5 million for FTE and out of pocket expense reimbursements. For the nine months ended September 30, 2009, the Company recorded total research and development revenues under the Amgen Agreement of $6.1 million, including $4.0 million for the material transferred and $2.1 million for FTE and out of pocket expense reimbursements.

     Deferred revenue related to Amgen was $0.7 million at September 30, 2009 and $24.5 million at December 31, 2008. The deferred revenue balance at September 30, 2009 resulted from Amgen’s prepayment of FTE reimbursements. The deferred revenue balance at December 31, 2008 represented the unrecognized portion of the upfront license fee and stock purchase premium from Amgen in 2006. Related party accounts receivable from Amgen were $4.5 million and $0.1 million at September 30, 2009 and December 31, 2008, respectively.

     GlaxoSmithKline (“GSK”). Pursuant to the collaboration and license agreement between the Company and GSK (the “GSK Agreement”), the Company recognized patent expense reimbursements from GSK of $19,000 and $67,000 for the three months ended

September 30, 2009 and 2008, respectively, and $45,000 and $93,000 for the nine months ended September 30, 2009 and 2008, respectively. These reimbursements were recorded as research and development revenues from related party. Related party accounts receivable from GSK were $49,000 and $0.1 million at September 30, 2009 and December 31, 2008, respectively.

Board Members

     James H. Sabry, M.D., Ph.D. is the Chairman of the Company’s Board of Directors and a consultant to the Company. The Company incurred consulting fees for services provided by Dr. Sabry of $15,000 and $15,000 for the three months ended September 30, 2009 and 2008, respectively, and $45,000 and $105,000 for the nine months ended September 30, 2009 and 2008, respectively. Related party payables and accrued liabilities included $5,000 and zero payable to Dr. Sabry at September 30, 2009 and December 31, 2008, respectively.

     James Spudich, Ph.D. is a member of the Company’s Board of Directors and a consultant to the Company. The Company incurred consulting fees for services provided by Dr. Spudich of $5,000 and $5,000 for the three months ended September 30, 2009 and 2008, respectively and $19,000 and $30,000 for the nine months ended September 30, 2009 and 2008, respectively. Related party payables and accrued liabilities included $5,000 and zero payable to Dr. Spudich at September 30, 2009 and December 31, 2008, respectively.

Note 5. Cash Equivalents, Investments and Fair Value Measurements

Cash Equivalents and Available for Sale Investments

     The amortized cost and fair value of cash equivalents and available for sale investments at September 30, 2009 and December 31, 2008 were as follows (in thousands):

		September 30, 2009
		Amortized				Unrealized				Unrealized				Fair				Maturity
		Cost				Gains				Losses				Value				Dates
Cash equivalents — money market funds		$	21,699				—				—			$	21,699
Short-term investments — U.S. Treasury securities		$	79,699			$	24			$				$	79,723				10/2009 — 3/2010

		December 31, 2008
		Amortized				Unrealized				Unrealized				Fair				Maturity
		Cost				Gains				Losses				Value				Dates
Cash equivalents — money market funds		$	41,224				—				—			$	41,224
Short-term investments — U.S. Treasury securities		$	15,030			$	18			$	—			$	15,048				1/2009 — 3/2009

     As of September 30, 2009 and December 31, 2008, the Company’s cash equivalents and short-term investments had no unrealized losses.

     Interest income was $0.1 million and $0.6 million for the three months ended September 30, 2009 and 2008, respectively; $0.5 million and $2.8 million for the nine months ended September 30, 2009 and 2008, respectively; and $28.0 million for the period August 5, 1997 (inception) through September 30, 2009.

Investments in Auction Rate Securities and Investment Put Option Related to Auction Rate Securities Rights

     The Company’s short-term investments in ARS as of September 30, 2009 and long-term investments in ARS as of December 31, 2008, refer to securities that are structured with short-term interest reset dates every 28 days but with maturities generally greater than 10 years. At the end of each reset period, investors can attempt to sell the securities through an auction process or continue to hold the securities. The Company has classified its ARS holdings as short-term investments as of September 30, 2009 and long-term investments as of December 31, 2008, based on its intention to liquidate the investments on June 30, 2010, the earliest date it can exercise the ARS Rights.

     At September 30, 2009, the Company held approximately $18.1 million in par value, $15.8 million carrying value, of ARS classified as short-term investments. The assets underlying these ARS are student loans that are substantially backed by the federal government. In February 2008, auctions began to fail for these securities and each auction since then has failed. Consequently, the investments are not currently liquid and the Company will not be able to access these funds until a future auction of these investments is successful, a buyer is found outside of the auction process, the investments are redeemed by the issuer or they mature. Historically, the fair value of ARS investments approximated par value due to the frequent interest rate resets associated with the auction process. However, there is not a current active market for these securities, and therefore they do not have a readily determinable market value. Accordingly, the estimated fair value of the ARS no longer approximates par value. The ARS continue to pay interest according to their stated terms.

     In the fourth quarter of 2008, based on valuation models of the individual securities, the Company recognized in the statement of operations a loss of approximately $3.4 million on ARS in Interest and Other, net, for which the Company concluded that an other-than-temporary impairment existed. The fair value of the Company’s investments in its ARS as of September 30, 2009 and December 31, 2008 was determined to be $15.8 million and $16.6 million, respectively. The Company sold $1.9 million of ARS at par value during the first nine months of 2009. Changes in the fair value of the ARS are recognized in current period earnings in Interest and Other, net. Therefore, the Company recognized unrealized gains of $352,000 and $1.0 million on its ARS in the third quarter and first nine months of 2009, respectively, to record the change in fair value.

     In connection with the failed auctions of the Company’s ARS, which were marketed and sold by UBS AG and its affiliates, in October 2008, the Company accepted a settlement with UBS AG pursuant to which UBS AG issued to the Company the ARS Rights. The ARS Rights provide the Company the right to receive the par value of its ARS, i.e., the liquidation preference of the ARS plus accrued but unpaid interest. Pursuant to the ARS Rights, the Company may require UBS to purchase its ARS at par value at any time between June 30, 2010 and July 2, 2012. In addition, UBS or its affiliates may sell or otherwise dispose of some or all of the ARS at its discretion at any time prior to expiration of the ARS Rights, subject to the obligation to pay the Company the par value of such ARS. The ARS Rights are not transferable, tradable or marginable, and will not be listed or quoted on any securities exchange or any electronic communications network. As consideration for the ARS Rights, the Company agreed to release UBS AG, UBS Securities LLC and UBS Financial Services, Inc., and/or their affiliates, directors, and officers from any claims directly or indirectly relating to the marketing and sale of the ARS, other than for consequential damages. UBS’s obligations in connection with the ARS Rights are not secured by its assets and UBS is not required to obtain any financing to support these obligations. UBS has disclaimed any assurance that it will have sufficient financial resources to satisfy its obligations in connection with the ARS Rights. If UBS has insufficient funding to buy back the ARS and the auction process continues to fail, the Company may incur further losses on the carrying value of the ARS.

     The ARS Rights represent a firm agreement in accordance with the accounting guidance for derivatives and hedging, which defines a firm agreement as an agreement with an unrelated party, binding on both parties and usually legally enforceable, with the following characteristics: a) the agreement specifies all significant terms, including the quantity to be exchanged, the fixed price and the timing of the transaction; and b) the agreement includes a disincentive for nonperformance that is sufficiently large to make performance probable. The enforceability of the ARS Rights results in a put option that is recognized as a separate freestanding instrument that is accounted for separately from the ARS investments. As of September 30, 2009 and December 31, 2008, the Company recorded $2.4 million and $3.4 million, respectively, as the fair value of the investment put option related to the ARS Rights, classified as short-term and long-term assets, respectively, on the balance sheet. The Company recorded a corresponding credit of $3.4 million to Interest and Other, net in the statement of operations for the year ended December 31, 2008 and a charge of $1.0 million for the nine months ended September 30, 2009. The investment put option related to the ARS Rights does not meet the definition of a derivative instrument. Therefore, the Company elected to measure the investment put option at fair value to mitigate volatility in reported earnings due to their linkage to the ARS. The Company valued the investment put option using a Black-Scholes option pricing model that included estimates of interest rates, based on data available, and was adjusted for any bearer risk associated with UBS’s financial ability to repurchase the ARS beginning June 30, 2010. Any change in these assumptions and market conditions would affect the value of the investment put option related to the ARS Rights.

     The Company records the investment put option related to the ARS Rights in accordance with the fair value option permitted under fair value accounting guidance for financial instruments. Changes in the fair value of the investment put option are recognized in current period earnings in Interest and Other, net. Accordingly, the Company recognized unrealized losses of $352,000 and $1.0 million on the investment put option in the third quarter and first nine months of 2009, respectively. The Company anticipates that any future changes in the fair value of the investment put option related to the ARS Rights will be offset by the changes in the fair value of the related ARS with no material net impact to the statements of operations, subject to adjustment for changes in UBS’s credit profile. The investment put option related to the ARS Rights will continue to be measured at fair value until the earlier of the Company’s exercise of the ARS Rights, UBS’s purchase of the ARS in connection with the ARS Rights, or the maturity of the ARS underlying the ARS Rights.

     The Company continues to monitor the market for ARS and consider its impact (if any) on the fair market value of its investments. If the market conditions deteriorate further, the Company may be required to record additional unrealized losses in earnings, offset by corresponding increases in the investment put option related to the ARS Rights, assuming no deterioration of UBS’s credit rating.

Fair Value Measurements

     The Company adopted the fair value accounting guidance to value its financial assets and liabilities. Fair value is defined as the price that would be received for assets when sold or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The Company utilizes market data or assumptions that the Company believes market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. These inputs can be readily observable, market corroborated or generally unobservable.

     The Company primarily applies the market approach for recurring fair value measurements and endeavors to utilize the best information reasonably available. Accordingly, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, and considers the security issuers’ and the third-party insurers’

credit risk in its assessment of fair value.

     The Company classifies the determined fair value based on the observability of those inputs. Fair value accounting guidance establishes a fair value hierarchy that prioritizes the inputs used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The three defined levels of the fair value hierarchy are as follows:

     Level 1 — Observable inputs, such as quoted prices in active markets for identical assets or liabilities;

     Level 2 — Inputs, other than the quoted prices in active markets, that are observable either directly or through corroboration with observable market data; and

     Level 3 — Unobservable inputs, for which there is little or no market data for the assets or liabilities, such as internally-developed valuation models.

     Financial assets measured at fair value on a recurring basis as of September 30, 2009 are classified in the table below in one of the three categories described above (in thousands):

		Fair Value Measurements Using												Assets
		Level 1				Level 2				Level 3				At Fair Value
Money market funds		$	21,699			$	—			$	—			$	21,699
U.S. Treasury securities			79,723				—				—				79,723
Investments in ARS			—				—				15,782				15,782
Investment put option related to ARS Rights			—				—				2,368				2,368
Total		$	101,422			$	—			$	18,150			$	119,572
Amounts included in:
Cash and cash equivalents		$	21,699			$	—			$	—			$	21,699
Short-term investments			79,723				—				—				79,723
Investments in ARS			—				—				15,782				15,782
Investment put option related to ARS Rights			—				—				2,368				2,368
Total		$	101,422			$	—			$	18,150			$	119,572

     Financial assets measured at fair value on a recurring basis as of December 31, 2008 are classified in the table below in one of the three categories described above (in thousands):

		Fair Value Measurements Using												Assets
		Level 1				Level 2				Level 3				At Fair Value
Money market funds		$	41,224			$	—			$	—			$	41,224
U.S. Treasury securities			15,048				—				—				15,048
Investments in ARS			—				—				16,636				16,636
Investment put option related to ARS Rights			—				—				3,389				3,389
Total		$	56,272			$	—			$	20,025			$	76,297
Amounts included in:
Cash and cash equivalents		$	41,224			$	—			$	—			$	41,224
Short-term investments			15,048				—				—				15,048
Investments in ARS			—				—				16,636				16,636
Investment put option related to ARS Rights			—				—				3,389				3,389
Total		$	56,272			$	—			$	20,025			$	76,297

     The valuation technique used to measure fair value for the Company’s Level 1 assets is a market approach, using prices and other relevant information generated by market transactions involving identical assets. The valuation technique used to measure fair value for Level 3 assets is an income approach, where, in most cases, the expected future cash flows are discounted back to present value for each asset, except for the investment put option related to the ARS Rights, which is based on Black-Scholes option pricing model and approximates the difference in value between the par value and the fair value of the associated ARS.

     At September 30, 2009, the Company held approximately $15.8 million in fair value of ARS classified as short-term investments. The assets underlying the ARS are student loans which are substantially backed by the federal government. The fair values of these securities as of September 30, 2009 were estimated utilizing a discounted cash flow (“DCF”) analysis. In the first quarter of fiscal year 2008, the Company reclassified its ARS to the Level 3 category, as some of the inputs used in the DCF model are unobservable. The valuation of the Company’s ARS investment portfolio is subject to uncertainties that are difficult to predict. The assumptions used in preparing the DCF model include estimates of interest rates, timing and amount of cash flows, credit and liquidity premiums and expected holding periods of the ARS, based on data available as of September 30, 2009. These assumptions are volatile and subject to change as the underlying sources of these assumptions and market conditions change, which could result in significant changes to the

fair value of the ARS. The significant assumptions of the DCF model are discount margins that are based on industry recognized student loan sector indices, an additional liquidity discount and an estimated term to liquidity. Other items that this analysis considers are the collateralization underlying the security investments, the creditworthiness of the counterparty and the timing of expected future cash flows. The Company’s ARS were also compared, when possible, to other observable market data for securities with similar characteristics as the ARS.

     Due to the change of the fair value of the Company’s ARS and the investment put option related to the ARS Rights, unrealized gains of $352,000 on the ARS and unrealized losses of $352,000 on the investment put option related to the ARS Rights were included in Interest and Other, net in the accompanying statements of operations for three months ended September 30, 2009. For the nine months ended September 30, 2009, unrecognized gains of $1.0 million on the ARS and unrealized losses of $1.0 million on the investment put option related to the ARS Rights were included in Interest and Other, net. The ARS investments continue to pay interest according to their stated terms.

     Changes to estimates and assumptions used in estimating the fair value of the ARS and the investment put option related to the ARS Rights may result in materially different values. In addition, actual market exchanges, if any, may occur at materially different amounts. Other factors that may impact the valuation of the Company’s ARS and investment put option related to the ARS Rights include changes to credit ratings of the securities and to the underlying assets supporting those securities, rates of default of the underlying assets, underlying collateral value, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity.

     As of September 30, 2009, the Company’s financial assets measured at fair value on a recurring basis using significant Level 3 inputs consisted solely of the ARS and the investment put option related to the ARS Rights. The following table provides a reconciliation for all assets measured at fair value using significant Level 3 inputs for the nine months ended September 30, 2009 (in thousands):

						Investment Put Option
		ARS				Related to ARS Rights
Balance as of December 31, 2008		$	16,636			$	3,389
Unrealized gain on ARS, included in Interest and Other, net			1,021				—
Unrealized loss on the investment put option related to ARS Rights, included in Interest and Other, net			—				(1,021	)
Sale of ARS			(1,875	)			—
Balance as of September 30, 2009		$	15,782			$	2,368

     The total amount of assets measured using valuation methodologies based on Level 3 inputs represented approximately 15% of the Company’s total assets that were measured at fair value as of September 30, 2009.

Note 6. Loan with UBS

     In connection with the settlement with UBS AG relating to the Company’s ARS, the Company entered into a loan agreement with UBS Bank USA and UBS Financial Services Inc. On January 5, 2009, the Company borrowed approximately $12.4 million under the loan agreement, with its ARS held in accounts with UBS and its affiliates as collateral. The loan amount was based on 75% of the fair value of the ARS as assessed by UBS at the time of the loan. The Company has drawn down the full amount available under the loan agreement. In general, the amount of interest payable under the loan agreement is intended to equal the amount of interest the Company would otherwise receive with respect to its ARS. During the three months ended September 30, 2009, the interest rate due on the UBS loan was higher than the interest rate earned from the ARS. During the nine months ended September 30, 2009, the interest rate due on the UBS loan was approximately the same as the interest rate earned from the ARS. The principal balance of the loan was lower than the par value of the ARS during the nine months ended September 30, 2009. During the three months ended September 30, 2009, the Company paid $41,000 of interest expense associated with the loan and received $33,000 in interest income from the ARS. During the nine months ended September 30, 2009, the Company paid $122,000 of interest expense associated with the loan and received $218,000 in interest income from the ARS. In accordance with the loan agreement, the Company applied the net interest received and the proceeds of $1.9 million from sales of ARS to the principal of the loan.

     The carrying amount of the loan with UBS approximates its fair value due to the loan’s short-term nature.

     The borrowings under the loan agreement are payable upon demand. However, upon such demand, UBS Financial Services Inc. or its affiliates will be required to arrange alternative financing for the Company on terms and conditions substantially the same as those under the loan agreement, unless the demand right was exercised as a result of certain specified events or the customer relationship between UBS and the Company is terminated for cause by UBS. If such alternative financing cannot be established, then a UBS affiliate will purchase the pledged ARS at par value. Proceeds of sales of the ARS will first be applied to repayment of the loan with the balance, if any, for the Company’s account.

Note 7. Restructuring

     In September 2008, the Company announced a restructuring plan to realign its workforce and operations in line with a strategic

reassessment of its research and development activities and corporate objectives. As a result, at the time, the Company focused its research activities to its muscle contractility programs while continuing to advance its then-ongoing clinical trials in heart failure and cancer, and discontinued early research activities directed to oncology. The Company communicated to affected employees a plan of organizational restructuring through involuntary terminations. Pursuant to the accounting guidance for exit or disposal cost obligations, the Company recorded a charge of approximately $2.5 million in 2008. To implement this plan, the Company reduced its workforce at the time by approximately 29%, or 45 employees. The affected employees were provided with severance and related benefits payments and outplacement assistance.

     The Company has completed substantially all restructuring activities and recognized all anticipated restructuring charges. All severance payments were made as of December 31, 2008.

     As a result of the restructuring plan, in the year ended December 31, 2008, the Company recorded restructuring charges of $2.2 million for employee severance and benefit related costs and $0.3 million related to the impairment of lab equipment that is held-for-sale. In the three months ended September 30, 2009, the Company recorded restructuring expenses of ($21,000), consisting of reversals of accrued employee benefit related restructuring costs and gains on disposals of held-for-sale equipment. In the nine months ended September 30, 2009, the Company recorded restructuring expenses of ($23,000), primarily consisting of reversals of accrued employee benefit related restructuring costs, partially offset by impairment charges for held-for-sale equipment. The Company is seeking to dispose of the remaining held-for-sale equipment.

     The following table summarizes the accrual balances and utilization by cost type for the restructuring plan (in thousands):

		Employee Severance				Impairment of Fixed
		and Related Benefit				Assets				Total
Restructuring liability at December 31, 2008		$	193			$	—			$	193
Charges (reversals of charges) — quarter ended March 31, 2009			(33	)			(25	)			(58	)
Charges (reversals of charges) — quarter ended June 30, 2009			(14	)			70				56
Charges (reversals of charges) — quarter ended September 30, 2009			(11	)			(10	)			(21	)
Cash payments			(135	)			45				(90	)
Non-cash settlement			—				(80	)			(80	)
Restructuring liability at September 30, 2009		$	—			$	—			$	—

Note 8. Stockholders’ Equity

Common Stock

     In October 2007, the Company entered into a committed equity financing facility (the “2007 CEFF”) with Kingsbridge Capital Limited (“Kingsbridge”), pursuant to which Kingsbridge committed to finance up to $75.0 million of capital for a three-year period. Subject to certain conditions and limitations, including a minimum volume-weighted average price of $2.00 for the Company’s common stock, from time to time under this facility, at the Company’s election, Kingsbridge is committed to purchase newly-issued shares of the Company’s common stock at a price between 90% and 94% of the volume-weighted average price on each trading day during an eight day, forward-looking pricing period. The maximum number of shares the Company may issue in any pricing period is the lesser of 2.5% of its market capitalization immediately prior to the commencement of the pricing period or $15.0 million. As part of the 2007 CEFF arrangement, the Company issued a warrant to Kingsbridge to purchase 230,000 shares of the Company’s common stock at a price of $7.99 per share, which represents a premium over the closing price of the common stock on the date the Company entered into this facility. This warrant is exercisable beginning six months after the date of grant and for a period of three years thereafter. The Company may sell a maximum of 9,779,411 shares (exclusive of the shares underlying the warrant) under the 2007 CEFF. Under the rules of the NASDAQ Stock Market LLC, this is approximately the maximum number of shares the Company may sell to Kingsbridge without its stockholders’ approval. This restriction may further limit the amount of proceeds the Company is able to obtain from the 2007 CEFF. The Company is not obligated to sell any of the $75.0 million of common stock available under the 2007 CEFF and there are no minimum commitments or minimum use penalties. The 2007 CEFF does not contain any restrictions on the Company’s operating activities, any automatic pricing resets or any minimum market volume restrictions. For the three and nine months ended September 30, 2009, under the 2007 CEFF, the Company sold 3,596,728 shares of its common stock to Kingsbridge and received gross proceeds of $6.9 million, before issuance costs of $98,000. 6,182,683 shares remain available to the Company for sale under the 2007 CEFF as of September 30, 2009.

     In May 2009, pursuant to a registered direct equity offering, the Company entered into subscription agreements with selected institutional investors to sell an aggregate of 7,106,600 units for a price of $1.97 per unit. Each unit consisted of one share of the Company’s common stock and one warrant to purchase 0.50 shares of common stock. Accordingly, a total of 7,106,600 shares of common stock and warrants to purchase 3,553,300 shares of common stock were issued and sold in this offering. The gross proceeds of the offering were $14.0 million. In connection with the offering, the Company paid placement agent fees to two registered broker-dealers totaling $0.8 million. After deducting the placement agent fees and the other offering costs, the Company received net proceeds of approximately $12.9 million from the offering. The offering was made pursuant to the Company’s shelf registration statement on Form S-3 (SEC File No.: 333-155259) declared effective by the SEC on November 19, 2008. The difference of

$9.7 million between the total offering proceeds of $12.9 million and the valuation of the warrants of $3.2 million was allocated to the common stock issued and was recorded as such in stockholders’ equity.

Warrants

     The Company issued warrants to purchase 3,553,300 shares of common stock to selected institutional investors in connection with the May 2009 registered direct equity offering. The initial exercise price of the warrants was $2.75 per share. If Amgen did not elect to exercise its option to obtain an exclusive, worldwide (excluding Japan) license to omecamtiv mecarbil for the potential treatment for heart failure by June 30, 2009, then the exercise price of the warrants would be changed to equal the volume-weighted average price of the Company’s common stock for the five days prior to June 30, 2009. In such case, the exercise price of the warrants could not exceed $2.75 or be less than $1.50 per share. If Amgen did exercise its option to obtain the exclusive license, then the warrant exercise price would remain at $2.75 per share. Because Amgen exercised its option to obtain the exclusive license prior to June 30, 2009, the exercise price of the warrants remained at $2.75 per share. The warrants are exercisable from the date of issuance and for 30 months thereafter. The warrants may not be exercised by a net cash exercise without the Company’s consent. Failure to maintain an effective registration statement is not considered within the Company’s control, and there is no circumstance that would require the Company to net cash settle the warrant in the event the Company does not have an effective registration statement.

     On the date of issuance, the warrants were valued at $3.2 million using the Black-Scholes pricing model, assigning probabilities to different assumed outcomes regarding whether Amgen would or would not exercise its option and obtain the exclusive license and to the resulting impact on the Company’s stock price. The assumptions were as follows: a contractual term of 30 months; a risk-free interest rate of 1.16%; volatility of 89%; the fair value of the Company’s common stock price on the issuance date, May 18, 2009, of $1.97 per share; a 90% probability that Amgen would obtain the exclusive license and a resulting stock price of $2.75 per share; and a 10% probability that Amgen would not obtain the exclusive license, with a resulting stock price of $1.97 per share. The assumed stock price of $2.75 upon Amgen obtaining the exclusive license approximated the per-share impact of an increase in the Company’s market capitalization of $50.0 million, the amount the Company would receive from Amgen for the exclusive license. The assumed stock price of $1.97 if Amgen did not obtain the license assumed no change to the Company’s market capitalization or stock price if Amgen did not obtain the exclusive license. The resulting valuation of $3.2 million for the warrants was recorded as a liability in the balance sheet on the date of issuance.

     On May 21, 2009, the date that the provision for repricing of warrants lapsed when Amgen exercised its option to obtain the license, the exercise price of the warrants became known, and the warrants were re-valued at $4.8 million using the Black-Scholes pricing model and the following assumptions: a contractual term of 30 months; a risk-free interest rate of 1.12%; volatility of 89%; the Company’s enterprise value on the valuation date, May 21, 2009, factoring in the $50 million proceeds from Amgen; and the contractual warrant exercise price of $2.75. The $1.6 million difference between the original valuation of the warrants and the subsequent valuation on May 21, 2009, was charged to Interest and Other, net, in the statements of operations for the three months ended June 30, 2009. The resulting valuation amount of $4.8 million for the warrants was reclassified from liabilities to additional paid-in capital in stockholders’ equity.

Stock Option Plans

     Stock option activity for the nine months ended September 30, 2009 under the 2004 Equity Incentive Plan, as amended, and the 1997 Stock Option/Stock Issuance Plan was as follows:

		Shares
		Available for								Weighted
		Grant of								Average Exercise
		Options				Stock Options				Price per Share
		or Awards				Outstanding				Stock Options
Balance at December 31, 2008			3,590,118				5,975,216			$	5.18
Increase in authorized shares			2,000,000				—				—
Options granted			(1,762,750	)			1,762,750			$	1.89
Options exercised			—				(196,183	)		$	1.43
Options forfeited/expired			96,934				(96,934	)		$	5.23
Restricted stock awards forfeited			5,520				—				—
Balance at September 30, 2009			3,929,822				7,444,849			$	4.50

     The weighted average fair value of options granted in the nine months ended September 30, 2009 was $1.28 per share.

     Restricted stock award activity for the nine months ended September 30, 2009 was as follows:

		Shares
		Available
		for Grant of				Weighted
		Options				Average Award Date
		or Awards				Fair Value per Share
Restricted stock awards outstanding at December 31, 2008			396,460			$	2.37
Awards granted			—				—
Award released			(195,470	)		$	2.37
Awards forfeited			(5,520	)		$	2.37
Restricted stock awards outstanding at September 30, 2009			195,470			$	2.37

Note 9. Interest and Other, net

     Components of Interest and Other, net were as follows (in thousands):

																		Period from
																		August 5, 1997
		Three Months Ended								Nine Months Ended								(date of inception)
		September 30,				September 30,				September 30,				September 30,				to September 30,
		2009				2008				2009				2008				2009
Unrealized gain (loss) on ARS (Note 5)		$	352			$	—			$	1,020			$	—			$	(2,368	)
Unrealized gain (loss) on investment put option related to ARS Rights (Note 5)			(352	)			—				(1,020	)			—				2,368
Warrant expense (Note 8)			—				—				(1,585	)			—				(1,585	)
Interest income and other income			112				571				480				2,819				28,420
Interest expense and other expense			(106	)			(118	)			(317	)			(398	)			(5,678	)
Interest and Other, net		$	6			$	453			$	(1,422	)		$	2,421			$	21,157

     Investments that the Company designates as trading securities are reported at fair value, with gains or losses resulting from changes in fair value recognized in earnings and included in Interest and Other, net. The Company classified its investments in ARS as trading securities in short-term assets on the balance sheet as of September 30, 2009.

     The Company elected to measure the investment put option related to the ARS Rights at fair value to mitigate volatility in reported earnings due to their linkage to the ARS. The Company recorded $2.4 million as the fair value of the investment put option related to the ARS Rights as of September 30, 2009, classified as a short-term asset on the balance sheet with a corresponding credit to Interest and Other, net. Changes in the fair value of the ARS are recognized in current period earnings in Interest and Other, net.

     Warrant expense of zero and $1.6 million for the three and nine months ended September 30, 2009, respectively, related to the change in the fair value of the warrant liability was recorded in connection with the Company’s registered direct equity offering in May 2009. See Note 8, “Stockholders’ Equity — Warrants ” for further discussion.

     Interest income and other income consists primarily of interest income generated from the Company’s cash, cash equivalents and investments. Interest expense and other expense primarily consists of interest expense on borrowings under the Company’s equipment financing lines, and, for the three and nine months ended September 30, 2009, interest expense on its loan agreement with UBS Bank USA and UBS Financial Services Inc.

Note 10. Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

     The Company adopted the new accounting guidance for determining fair value when the volume and level of activity for an asset or liability have significantly decreased and for identifying transactions that are not orderly. The new guidance provides additional direction for determining fair values when there is no active market or where the price inputs represent distressed sales. The new guidance reaffirms existing guidance that fair value is the amount for which an asset would be sold in an orderly transaction (as opposed to a forced liquidation or distressed sale) under current market conditions at the date of the financial statements. The new guidance amends the disclosure provisions of existing guidance to require entities to disclose the valuation inputs and techniques in interim and annual financial statements, and to disclose fair value hierarchies and the Level 3 reconciliation by major security types. The Company’s adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on its financial position or results of operations.

     The Company adopted the new accounting guidance on interim disclosures about the fair value of financial instruments. The new guidance amends the existing guidance to require public companies to provide disclosures about the fair value of financial instruments in interim and annual financial statements. The Company’s adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on its financial position or results of operations.

     The Company adopted the new accounting guidance for recognition and presentation of other-than-temporary impairments. The new guidance provides additional direction for determining the credit and non-credit components of other-than-temporary

impairments of debt securities classified as available-for-sale or held-to-maturity. The guidance also increases and clarifies existing disclosure requirements and extends the disclosure frequency to interim and annual periods. The Company’s adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on its financial position or results of operations.

     The Company adopted the new accounting guidance for subsequent events, which establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued or are available to be issued. It provides guidance regarding the period after the balance sheet date during which management should evaluate events or transactions for potential recognition or disclosure in the financial statements, the circumstances under which an entity should recognize events or transactions occurring after the balance sheet date, and the disclosures that an entity should make about events or transactions that occurred after the balance sheet date. The Company’s adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on its financial position or results of operations.

     The Company adopted the Financial Accounting Standard Board’s (“FASB”) new guidance on the hierarchy and sources of GAAP. The new guidance identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of financial statements of nongovernmental entities that are presented in conformity with GAAP in the United States. The guidance establishes the FASB Accounting Standards Codification (the “Codification”) as the source of authoritative accounting principles recognized by the FASB to be applied by nongovernmental entities in the preparation of financial statements in conformity with GAAP. The issuance of the Codification did not change GAAP. The Company’s adoption of the new guidance in the quarter ended September 30, 2009 did not have a material impact on its financial position or results of operations. However, all references to GAAP literature in the Company’s current and historical filings are superseded by references to the Codification.

Accounting Pronouncements Not Yet Adopted

     In August 2009, the FASB issued new accounting guidance for measuring liabilities at fair value. The new guidance amends existing guidance to provide clarification on how to measure the fair value of a liability in circumstances in which a quoted price in an active market for the identical liability is not available. It also clarifies that when estimating the fair value of a liability, an entity is not required to include or adjust an input relating to a restriction that prevents the transfer of the liability. The new guidance also clarifies that the quoted price for an identical liability when traded as an asset in an active market may be used as a Level 1 fair value measurement for a liability. The Company will adopt the new guidance in the quarter ending December 31, 2009, and does not expect that the adoption will have a material impact on its financial position or results of operation.

     In October 2009, the FASB issued new accounting guidance for recognizing revenue for a multiple-deliverable revenue arrangement. The new guidance amends the existing guidance for separately accounting for individual deliverables in a revenue arrangement with multiple deliverables, and removes the criterion that an entity must use objective and reliable evidence of fair value to separately account for the deliverables. The new guidance also establishes a hierarchy for determining the value of each deliverable and establishes the relative selling price method for allocating consideration when vendor specific objective evidence or third party evidence of value does not exist. The Company must adopt the new guidance prospectively for new revenue arrangements entered into or materially modified beginning in the first quarter of 2011. Earlier adoption is permitted. The Company is currently evaluating the impact that the new guidance will have on its financial statements and the timing of its adoption.

ITEM 2.		MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     This discussion and analysis should be read in conjunction with our financial statements and accompanying notes included elsewhere in this report. Operating results are not necessarily indicative of results that may occur in future periods.

     This report contains forward-looking statements that are based upon current expectations within the meaning of the Private Securities Litigation Reform Act of 1995. We intend that such statements be protected by the safe harbor created thereby. Forward-looking statements involve risks and uncertainties and our actual results and the timing of events may differ significantly from the results discussed in the forward-looking statements. Examples of such forward-looking statements include, but are not limited to, statements about or relating to:

	•		guidance concerning revenues, research and development expenses and general and administrative expenses for 2009;
	•		the sufficiency of existing resources to fund our operations for at least the next 12 months;
	•		our capital requirements and needs for additional financing;
	•		the initiation, design, progress, timing and scope of clinical trials and development activities for our drug candidates and potential drug candidates conducted by ourselves or our partners, including the anticipated timing for initiation of clinical trials and anticipated dates of data becoming available or being announced from clinical trials;
	•		the results from the clinical trials of our drug candidates omecamtiv mecarbil (formerly known as CK-1827452), CK-2017357, ispinesib, SB-743921 and GSK-923295, and the significance of such results;

	•		the advancement of potential drug candidates into and through preclinical studies and clinical trials;
	•		our and our partners’ plans or ability to conduct the continued research and development of our drug candidates and potential drug candidates;
	•		our expected roles in research, development or commercialization under our strategic alliances, such as with Amgen Inc. (“Amgen”) and GlaxoSmithKline (“GSK”);
	•		the properties and potential benefits of, and the potential market opportunities for, our drug candidates and potential drug candidates;
	•		the sufficiency of the clinical trials conducted with our drug candidates to demonstrate that they are safe and efficacious;
	•		our plans or ability to commercialize drugs with or without a partner, including our intention to develop sales and marketing capabilities;
	•		our receipt of milestone payments, royalties, reimbursements and other funds from our partners under strategic alliances, such as with Amgen and GSK;
	•		our ability to continue to identify additional potential drug candidates that may be suitable for clinical development;
	•		the focus, scope and size of our research and development activities and programs;
	•		the issuance of shares of our common stock under our committed equity financing facility entered into with Kingsbridge Capital Limited (“Kingsbridge”) in 2007;
	•		our plans and ability to liquidate our auction rate securities (“ARS”) investments;
	•		our ability to protect our intellectual property and to avoid infringing the intellectual property rights of others;
	•		expected future sources of revenue and capital;
	•		losses, costs, expenses and expenditures;
	•		future payments under lease obligations and equipment financing lines;
	•		potential competitors and competitive products;
	•		increasing the number of our employees, retaining key personnel and recruiting additional key personnel;
	•		expected future amortization of employee stock-based compensation; and
	•		the potential impact of recent accounting pronouncements on our financial position or results of operations.

     Such forward-looking statements involve risks and uncertainties, including, but not limited to, those risks and uncertainties relating to:

	•		Amgen’s and GSK’s decisions with respect to the timing, design and conduct of development activities for omecamtiv mecarbil and GSK-923295, respectively;
	•		our ability to obtain additional financing;
	•		our receipt of funds under our strategic alliances;
	•		difficulties or delays in the development, testing, production or commercialization of our drug candidates, including decisions by Amgen or GSK to postpone or discontinue research or development activities relating to omecamtiv mecarbil or GSK-923295, respectively;
	•		difficulties or delays in or slower than anticipated patient enrollment in our or our partners’ clinical trials;
	•		unexpected adverse side effects or inadequate therapeutic efficacy of our drug candidates that could slow or prevent product approval (including the risk that current and past results of preclinical studies or clinical trials may not be indicative of future clinical trials results);
	•		results from non-clinical studies that may adversely impact the further development of our drug candidates and potential drug candidates;
	•		the possibility that the U.S. Food and Drug Administration (“FDA”) or foreign regulatory agencies may delay or limit our or our partners’ ability to conduct clinical trials or may delay or withhold approvals for the manufacture and sale of our products;

	•		activities and decisions of, and market conditions affecting, current and future strategic partners;
	•		the conditions in our 2007 committed equity financing facility with Kingsbridge that must be fulfilled before we can require Kingsbridge to purchase our common stock, including the minimum volume-weighted average share price;
	•		our ability to maintain the effectiveness of our registration statement permitting resale of securities to be issued to Kingsbridge by us in connection with our 2007 committed equity financing facility;
	•		changing standards of care and the introduction of products by competitors or alternative therapies for the treatment of indications we target that may make our drug candidates commercially unviable;
	•		the uncertainty of protection for our intellectual property, whether in the form of patents, trade secrets or otherwise; and
	•		potential infringement or misuse by us of the intellectual property rights of third parties.

     In addition such statements are subject to the risks and uncertainties discussed in the “Risk Factors” section and elsewhere in this document. Operating results reported are not necessarily indicative of results that may occur in future periods.

     When used in this report, unless otherwise indicated, “Cytokinetics,” “the Company,” “we,” “our” and “us” refers to Cytokinetics, Incorporated.

     CYTOKINETICS, and our logo used alone and with the mark CYTOKINETICS, are registered service marks and trademarks of Cytokinetics. Other service marks, trademarks and trade names referred to in this report are the property of their respective owners.

Overview

     We are a clinical-stage biopharmaceutical company focused on the discovery and development of novel small molecule therapeutics that modulate muscle function for the potential treatment of serious diseases and medical conditions. Our research and development activities are founded on our knowledge and expertise regarding the cytoskeleton, a complex biological infrastructure that plays a fundamental role within every human cell. These activities initially focused on inhibitors of cell division, and are now directed to the biology of muscle function, and in particular, to small molecule modulators of the contractility of cardiac, smooth and skeletal muscle. We intend to leverage our expertise in muscle contractility in order to expand our current pipeline into new therapeutic areas, and expect to continue to be able to identify additional potential drug candidates that may be suitable for clinical development.

     We have five drug candidates currently in human clinical trials: omecamtiv mecarbil (formerly known as CK-1827452) is in Phase IIa clinical development for the potential treatment of heart failure; CK-2071357 is in Phase I clinical development and may be developed for diseases or medical conditions associated with muscle weakness or wasting; ispinesib is the subject of a Phase I/II clinical trial in breast cancer patients; SB-743921 is the subject of a Phase I/II clinical trial in patients with Hodgkin or non-Hodgkin lymphoma; and GSK-923295 is the subject of Phase I clinical trial in patients with advanced, refractory solid tumors. We also have two potential drug candidates currently in preclinical development: a back-up development compound for CK-2017357 and an inhibitor of smooth muscle myosin intended for inhaled delivery that may be useful as a potential treatment of diseases such as pulmonary arterial hypertension, asthma or chronic obstructive pulmonary disease.

Muscle Contractility Programs

     Cardiac Muscle Contractility

     Our lead drug candidate, omecamtiv mecarbil, a novel cardiac muscle myosin activator for the potential treatment of heart failure, is currently in Phase IIa clinical development to evaluate the safety, tolerability, pharmacodynamics and pharmacokinetic profile of this drug candidate in both an intravenous and oral formulation.

     In December 2006, we entered into a collaboration and option agreement with Amgen Inc. to discover, develop and commercialize novel small molecule therapeutics that activate cardiac muscle contractility for potential applications in the treatment of heart failure, including omecamtiv mecarbil. The agreement provided Amgen with a non-exclusive license and access to certain technology. The agreement also granted Amgen an option to obtain an exclusive license worldwide, except Japan, to develop and commercialize omecamtiv mecarbil and other drug candidates arising from the collaboration. In May 2009, Amgen exercised this option and subsequently paid us an exercise fee of $50.0 million. Amgen is now responsible for the development and commercialization of omecamtiv mecarbil and related compounds, at its expense, subject to our development and commercialization participation rights. The agreement provides for potential pre-commercialization and commercialization milestone payments of up to $600.0 million in the aggregate on omecamtiv mecarbil and other potential products arising from research under the collaboration, and royalties that escalate based on increasing levels of annual net sales of products commercialized under the agreement. The agreement also provides for us to receive increased royalties by co-funding Phase III development costs of drug candidates under the collaboration. If we elect to co-fund such costs, we would be entitled to co-promote omecamtiv mecarbil in North America and participate in agreed commercialization activities in institutional care settings, at Amgen’s expense.

     In August 2009, at the Annual Meeting of the European Society of Cardiology (ESC), and in September at the 2009 Heart Failure Society of America (HFSA) Annual Meeting, final data from the Phase IIa clinical trial of omecamtiv mecarbil in stable heart failure patients was presented. The authors concluded that patients with reduced stroke volumes (< 50 mL) at baseline had generally greater pharmacodynamic responses to omecamtiv mecarbil than those in patients with greater stroke volumes at baseline, demonstrating robust pharmacodynamic activity in this more severely affected sub-population of patients from the study. Statistically significant increases in systolic ejection time, and in stroke volume, cardiac output, fractional shortening, and ejection fraction (all measures of cardiac function), occurred across the patient population in a concentration-dependent manner. In addition, the data demonstrated statistically significant correlations between increasing omecamtiv mecarbil plasma concentration and decreases in left ventricular end-systolic volume, left ventricular end-diastolic volume and heart rate.

     In August 2009, at the Annual Meeting of the ESC, and in September at the 2009 HFSA Annual Meeting, final data from the Phase IIa clinical trial of omecamtiv mecarbil in patients with ischemic cardiomyopathy and angina was presented. The authors concluded that in these patients, who theoretically could be most vulnerable to the possible deleterious consequences of systolic ejection time prolongation, treatment with omecamtiv mecarbil, at plasma concentrations previously demonstrated in other Phase IIa trials to increase cardiac function, did not adversely affect a broad range of safety assessments in the setting of exercise.

     During the third quarter of 2009, the Phase IIa clinical trial designed to evaluate the pharmacokinetics of both modified and immediate release oral formulations of omecamtiv mecarbil in patients with stable heart failure continued to enroll patients.

     In July 2009, Cytokinetics and Amgen announced the discontinuation of the Phase IIa clinical trial evaluating an intravenous formulation of omecamtiv mecarbil in patients with stable heart failure undergoing clinically indicated coronary angiography in the cardiac catheterization laboratory. This decision, made jointly by the companies, was due to the challenges of the current trial design and the constraints on enrolling eligible and consenting patients. The companies may revisit the objectives of this trial in the context of the overall clinical development program for omecamtiv mecarbil.

     Cytokinetics and Amgen have agreed on next steps relating to the further development of omecamtiv mecarbil. The companies are planning a clinical trial designed to further assess the pharmacokinetics of both modified and immediate release oral formulations of omecamtiv mecarbil in patients with stable heart failure, using active pharmaceutical ingredient and drug product manufactured by Amgen. In addition, the companies are planning to conduct another pharmacokinetic trial to evaluate omecamtiv mecarbil in patients with renal dysfunction, along with additional pre-clinical activities. Cytokinetics and Amgen anticipate the initiation of the Phase IIb clinical trials program to occur in 2011, but the companies are discussing if and how the timeline potentially could be accelerated into 2010.

     The clinical trials program for omecamtiv mecarbil may proceed for several years, and we will not be in a position to generate any revenues or material net cash flows from sales of this drug candidate until the program is successfully completed, regulatory approval is achieved, and the drug is commercialized. Omecamtiv mecarbil is at too early a stage of development for us to predict when or if this may occur. We funded all research and development costs associated with this program prior to Amgen’s option exercise. We recorded research and development expenses for activities relating to our cardiac muscle contractility program of approximately $9.1 million and $15.7 million in the nine months ended September 30, 2009 and 2008, respectively. We anticipate that our expenditures relating to the research and development of compounds in our cardiac muscle contractility program will increase if we participate in the future advancement of omecamtiv mecarbil through clinical development. Our expenditures will also increase if Amgen terminates development of omecamtiv mecarbil or related compounds and we elect to develop them independently or if we elect to co-fund later-stage development of omecamtiv mecarbil or other compounds in our cardiac muscle contractility program under our collaboration and option agreement with Amgen.

Skeletal Muscle Contractility

     In April 2008, we announced that we had selected CK-2017357 as the lead potential drug candidate from our skeletal sarcomere activator program. In January 2009, we announced that we had selected another compound from this program as a backup development compound to CK-2017357. CK-2017357 and its backup development compound are structurally distinct small molecule activators of the skeletal sarcomere. These compounds act on fast skeletal muscle troponin. Activation of troponin increases its sensitivity to calcium, leading to an increase in skeletal muscle contractility. This mechanism of action has demonstrated encouraging pharmacological activity in preclinical models. We are evaluating the potential indications for which CK-2017357 may be useful. These may include diseases and medical conditions associated with skeletal muscle weakness or wasting, such as amyotrophic lateral sclerosis, also known as ALS or Lou Gehrig’s disease, claudication, cachexia in connection with heart failure or cancer, sarcopenia, post-surgical rehabilitation and general frailty associated with aging.

     We continue to dose healthy volunteers in a Phase I, first-time-in-humans, ascending, single-dose, double-blind, placebo-controlled clinical trial of CK-2017357 designed to assess the safety, tolerability and pharmacokinetic profile of this drug candidate and to determine its maximum tolerated dose and plasma concentration. Although the trial is still ongoing and thus remains blinded, to date, no adverse events have been observed in trial participants to indicate that an intolerable dose has been administered. Consequently,

the maximum tolerated dose has not yet been determined. However, doses that produced CK-2017357 blood levels associated with increased skeletal muscle function in preclinical models have been tolerated by the healthy volunteers in this study.

     We anticipate initiating a Phase I multi-dose study of CK-2017357 in healthy volunteers in 2009. We are scheduled to present non-clinical data from CK-2017357 at the Society on Cachexia and Wasting Disorders’ 5th Annual Cachexia Conference in Barcelona, Spain in December 2009.

     CK-2017357 is at too early a stage of development for us to predict if or when we will be in a position to generate any revenues or material net cash flows from its commercialization. We currently fund all research and development costs associated with this program. We recorded research and development expenses for activities relating to our skeletal muscle contractility program of approximately $10.6 million and $7.5 million in the nine months ended September 30, 2009 and 2008, respectively. We anticipate that our expenditures relating to the research and development of compounds in our skeletal muscle contractility program will increase significantly if and as we advance CK-2017357, its back-up compound or other compounds from this program into and through development.

Smooth Muscle Contractility

     In January 2009, we announced that we had selected a lead potential drug candidate from this program for advancement. This compound is a small molecule direct inhibitor of smooth muscle myosin. By inhibiting the function of the myosin motor central to the contraction of smooth muscle, this small molecule directly leads to the relaxation of contracted smooth muscle. Specifically intended for inhaled delivery applications, this potential drug candidate has demonstrated encouraging pharmacological activity in preclinical models as a novel mechanism vasodilator and bronchodilator. This data suggests that it may be useful as a potential treatment of diseases such as pulmonary arterial hypertension, asthma or chronic obstructive pulmonary disease. This potential drug candidate is currently in investigational new drug application (“IND”)-enabling studies, and we are continuing to conduct non-clinical development of other smooth muscle myosin inhibitors.

     We are scheduled to present non-clinical data from our smooth muscle myosin inhibitor program at the 2009 Scientific Sessions of the American Heart Association in Orlando, Florida in November 2009.

     This potential drug candidate is at too early a stage of development for us to predict if or when we will be in a position to generate any revenues or material net cash flows from its commercialization. We currently fund all research and development costs associated with this program. We recorded research and development expenses for activities relating to our smooth muscle contractility program of approximately $4.3 million and $5.8 million in the nine months ended September 30, 2009 and 2008, respectively. We anticipate that our expenditures relating to the research and development of compounds in our smooth muscle contractility program will increase significantly if and as we advance this smooth muscle myosin inhibitor or other compounds from this program into and through development.

Oncology Program: Mitotic Kinesin Inhibitors

     We currently have three drug candidates in clinical trials for the potential treatment of cancer: ispinesib, SB-743921 and GSK-923295. All of these arose from our earlier research activities directed to the role of the cytoskeleton in cell division and progressed under our strategic alliance with GSK. This strategic alliance was established in 2001 to discover, develop and commercialize novel small molecule therapeutics targeting mitotic kinesins for applications in the treatment of cancer and other diseases. Mitotic kinesins are a family of cytoskeletal motor proteins involved in the process of cell division, or mitosis. Under that strategic alliance, we focused primarily on two mitotic kinesins: kinesin spindle protein (“KSP”) and centromere-associated protein E (“CENP-E”). In November 2006, we amended the agreement and assumed responsibility, at our expense, for the continued research, development and commercialization of inhibitors of KSP, including ispinesib and SB-743921, and other mitotic kinesins, other than CENP-E. GSK retained an option to resume responsibility for the development and commercialization of either or both of ispinesib and SB-743921. This option expired at the end of 2008. Accordingly, we retain all rights to both ispinesib and SB-743921, subject to certain royalty obligations to GSK. In each of June 2006, 2007 and 2008, we amended the agreement to extend the research term of the GSK strategic alliance for an additional year to continue joint research directed to CENP-E. This research term expired in June 2009. However, collaborative translational research continues as part of the development program for GSK-923295.

Ispinesib

     A broad Phase II clinical trials program has been conducted for ispinesib across multiple tumor types. To date, we believe clinical activity for ispinesib has been observed in non-small cell lung, ovarian and breast cancers, with the most robust clinical activity observed in a Phase II clinical trial evaluating ispinesib in the treatment of patients with locally advanced or metastatic breast cancer that had failed treatment with taxanes and anthracyclines. In addition, preclinical and Phase Ib clinical data relating to ispinesib indicate that it may have an additive effect when combined with certain existing chemotherapeutic agents.

     We continue to treat a patient in the Phase I portion of a Phase I/II clinical trial for ispinesib in chemotherapy-naïve locally advanced or metastatic breast cancer patients using a more dose-dense schedule than was previously evaluated. This clinical trial is intended to determine if the overall response to ispinesib can be increased while maintaining its existing safety profile and to further define its clinical activity profile. In June 2009, at the Annual Meeting of the American Society of Clinical Oncology (“ASCO”), a poster

containing interim data from the Phase I portion of this trial was presented. This poster highlighted the safety and tolerability of ispinesib and tumor reductions of at least 30 percent in 3 patients in this trial. Ispinesib appeared to demonstrate anti-cancer activity with a similar toxicity profile when compared with prior clinical trials conducted with a once every 21 days dosing schedule. We are seeking a strategic partner for the future development and commercialization of ispinesib.

SB-743921

     We continue to conduct the Phase I portion of a Phase I/II clinical trial evaluating SB-743921’s safety, tolerability and pharmacokinetics in patients with Hodgkin or non-Hodgkin lymphoma using a more dose-dense schedule than was previously evaluated. This clinical trial is intended to determine if the overall response to SB-743921 can be increased while maintaining its existing safety profile. At the ASCO Annual Meeting in May 2009, a poster containing interim data from the Phase I portion of this trial was presented. A preliminary potential efficacy signal in the form of partial responses has been observed at doses at or above 6 mg/m² in four patients with Hodgkin lymphoma and indolent non-Hodgkin lymphoma. The poster highlighted data indicating an objective partial response rate of 30 percent (3 of 10 patients) in the last two dosing levels of 8 mg/m² and 9 mg/ m². The main toxicity of SB-743921 observed has been myelosuppression, predominantly neutropenia. Grade 3 or 4 toxicities other than myelosuppression are infrequent; in particular, there has been no evidence of neuropathy or alopecia greater than Grade 1. We are scheduled to present data from the Phase I portion of this trial at the Annual Meeting of the American Society of Hematology in New Orleans, Louisiana in December 2009.

     We intend to complete the Phase I portion of this trial and are seeking a strategic partner for the future development and commercialization of SB-743921.

GSK-923295

     Under our strategic alliance, GSK is responsible, at its expense, for the development of and commercialization of GSK-923295. GSK continues to enroll and dose-escalate patients in a Phase I first-in-humans clinical trial evaluating GSK-923295 in patients with advanced, refractory solid tumors.

     GSK is scheduled to present pharmacogenomic and drug combination data evaluating GSK-923295 with a MEK inhibitor in preclinical models at the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics in Boston, Massachusetts in November 2009.

     We will receive royalties from GSK’s sales of any drugs developed under the strategic alliance. For those drug candidates that GSK develops under the strategic alliance, we can elect to co-fund certain later-stage development activities which would increase our potential royalty rates on sales of resulting drugs and provide us with the option to secure co-promotion rights in North America. If we elect to co-fund later-stage development, we expect that the royalties to be paid on future sales of GSK-923295 could potentially increase based on increasing product sales and our anticipated level of co-funding. If we exercise our co-promotion option, then we are entitled to receive reimbursement from GSK for certain sales force costs we incur in support of our commercialization activities.

     The clinical trials program for each of ispinesib, SB-743921 and GSK-923295 may proceed for several years, and we will not be in a position to generate any revenues or material net cash flows from sales of any of these drug candidates until its clinical trials program is successfully completed, regulatory approval is achieved and the drug is commercialized. Each of these drug candidates is at too early a stage of development for us to predict when or if this may occur. We currently fund all research and development costs associated with ispinesib and SB-743921. If we continue to conduct our Phase I/II clinical trials for either or both of ispinesib and SB-743921, our expenditures relating to research and development of these drug candidate will increase significantly. We recorded research and development expenses for activities relating to our mitotic kinesin inhibitors program of approximately $3.2 million and $5.9 million for the nine months ended September 30, 2009 and 2008, respectively. We received and recognized as revenue reimbursements from GSK of full-time employee equivalent (“FTE”) and other expenses related to our mitotic kinesin inhibitors program of $45,000 and $93,000 for the nine months ended September 30, 2009 and 2008, respectively.

Development Risks

     Whether any of our drug candidates will successfully complete development and be approved for commercial sale is highly uncertain. Moreover, we cannot estimate with certainty or know the exact nature, timing and costs of the activities necessary to complete the development of any of our drug candidates or the date of completion of these development activities due to numerous risks and uncertainties, including, but not limited to:

	•		decisions made by Amgen with respect to the development of omecamtiv mecarbil or by GSK with respect to the development of GSK-923295;
	•		the uncertainty of the timing of the initiation and completion of patient enrollment and treatment in our clinical trials;
	•		the possibility of delays in the collection of clinical trial data and the uncertainty of the timing of the analyses of our clinical trial data after these trials have been initiated and completed;

	•		our potential inability to obtain additional funding and resources for our development activities on acceptable terms, if at all, including, but not limited to, our potential inability to obtain or retain partners to assist in the design, management, conduct and funding of clinical trials;
	•		delays or additional costs in manufacturing of our drug candidates for clinical trial use, including developing appropriate formulations of our drug candidates;
	•		the uncertainty of clinical trial results, including variability in patient response;
	•		the uncertainty of obtaining FDA or other foreign regulatory agency approval required for the clinical investigation of our drug candidates;
	•		the uncertainty related to the development of manufacturing processes and qualification of appropriate manufacturing facilities and controls; and
	•		possible delays in the characterization, synthesis or optimization of potential drug candidates.

     If we fail to complete the development of any of our drug candidates in a timely manner, it could have a material adverse effect on our operations, financial position and liquidity. In addition, any failure by us or our partners to obtain, or any delay in obtaining, regulatory approvals for our drug candidates could have a material adverse effect on our results of operations. A further discussion of the risks and uncertainties associated with completing our programs on schedule, or at all, and certain consequences of failing to do so are discussed further in the risk factors entitled “We have never generated, and may never generate, revenues from commercial sales of our drugs and we may not have drugs to market for at least several years, if ever,” “Clinical trials may fail to demonstrate the desired safety and efficacy of our drug candidates, which could prevent or significantly delay completion of clinical development and regulatory approval” and “Clinical trials are expensive, time-consuming and subject to delay,” and other risk factors.

Revenues

     Our current revenue sources are limited, and we do not expect to generate any revenue from product sales for several years, if at all. We have recognized revenues from our strategic alliances with Amgen and GSK for license fees and agreed research and development activities.

     Under our collaboration and option agreement with Amgen, we received an upfront, non-refundable non-exclusive license and technology access fee of $42.0 million in 2006. In connection with entering into the agreement, we also entered into a common stock purchase agreement with Amgen. In January 2007, we issued 3,484,806 shares of our common stock to Amgen for net proceeds of $32.9 million, of which the $6.9 million purchase premium was recorded as deferred revenue. Through the first quarter of 2009, we were amortizing the upfront non-exclusive license and technology access fee and stock purchase premium to license revenue ratably over the maximum term of the non-exclusive license, which was four years. In the second quarter of 2009, we recognized as revenue the remaining balance of $21.4 million of the related deferred revenue when Amgen exercised its option, triggering the end of the non-exclusive license period. In the second quarter of 2009, we received a non-refundable option exercise fee from Amgen of $50.0 million, which we recognized in revenue as license fees from related party. We may receive additional payments from Amgen upon achieving certain precommercialization and commercialization milestones. Milestone payments are non-refundable and are recognized as revenue when earned, as evidenced by the achievement of the specified milestones and the absence of ongoing performance obligations.

     We have received reimbursements, and may be eligible to receive further reimbursements, from Amgen for agreed research and development activities, which we will record as revenue if and when the related expenses are incurred. We record amounts received in advance of performance as deferred revenue.

     Revenues from GSK in 2006 were based on negotiated rates intended to approximate the costs for our FTEs performing research under the strategic alliance and our out-of-pocket expenses, which we recorded as the related expenses were incurred. GSK paid us an upfront licensing fee, which we recognized ratably over the strategic alliance’s initial five-year research term, which ended in June 2006. In 2007, we received a $1.0 million milestone payment from GSK relating to its initiation of a Phase I clinical trial of GSK-923295. We may receive additional payments from GSK upon the achievement of certain precommercialization milestones. Milestone payments are non-refundable and are recognized as revenue when earned, as evidenced by achievement of the specified milestones and the absence of ongoing performance obligations. We record amounts received in advance of performance as deferred revenue. The revenues recognized to date are non-refundable, even if the relevant research effort is not successful. In December 2008, GSK’s option to license ispinesib and SB-743291 expired and all rights to these drug candidates remain with us under the collaboration and license agreement, subject to our royalty obligations to GSK. GSK continues to conduct the development of GSK-923295 under the agreement.

     Because a substantial portion of our revenues for the foreseeable future will depend on achieving development and other precommercialization milestones under our strategic alliances with Amgen and GSK, our results of operations may vary substantially from year to year.

     If one or more of our drug candidate is approved for sale as a drug, we expect that our future revenues will most likely be derived from royalties on sales from drugs licensed to Amgen or GSK under our strategic alliances and from those licensed to future partners, and from direct sales of our drugs. We retain a product-by-product option to co-fund certain later-stage development activities under our strategic alliance with Amgen, thereby potentially increasing our royalties and affording us co-promotion rights in North America. For products developed by GSK under our strategic alliance, we also retain a product-by-product option to co-fund certain later-stage development activities, thereby potentially increasing our royalties and affording us co-promotion rights in North America. If we exercise our co-promotion rights under either strategic alliance, we are entitled to receive reimbursement for certain sales force costs we incur in support of our commercial activities.

Research and Development

     We incur research and development expenses associated with both partnered and unpartnered research activities. We expect to incur research and development expenses for omecamtiv mecarbil for the treatment of heart failure in accordance with the agreed upon research and development plans with Amgen. We expect to incur research and development expenses for the continued conduct of preclinical studies and clinical trials for CK-2017357 and other skeletal sarcomere activators for the potential treatment of diseases and medical conditions associated with muscle weakness or wasting; our smooth muscle myosin inhibitor potential drug candidate and other smooth muscle myosin inhibitor compounds for the potential treatment of pulmonary arterial hypertension, systemic hypertension and diseases and medical conditions associated with bronchoconstriction and in connection with our research programs in other disease areas.

     Research and development expenses related to our strategic alliance with GSK consisted primarily of costs related to research and screening, lead optimization and other activities relating to the identification of compounds for development as mitotic kinesin inhibitors for the treatment of cancer. Prior to June 2006, certain of these costs were reimbursed by GSK on an FTE basis. From 2001 through November 2006, GSK funded the majority of the costs related to the clinical development of ispinesib and SB-743921. Under our amended collaboration and license agreement with GSK, we assumed responsibility for the continued research, development and commercialization of inhibitors of KSP, including ispinesib and SB-743921, and other mitotic kinesins other than CENP-E, at our sole expense. We also have the option to co-fund certain later-stage development activities for GSK-923295. Our potential exercise of our co-funding option for GSK-923295 would result in a significant increase in research and development expenses. In addition, we expect to incur development expenses for the close-out of the clinical trials for ispinesib for the potential treatment of breast cancer and SB-743921 for the potential treatment of Hodgkin and non-Hodgkin lymphoma.

     Research and development expenses related to any development and commercialization activities we elect to fund would consist primarily of employee compensation, supplies and materials, costs for consultants and contract research, facilities costs and depreciation of equipment. From our inception through September 30, 2009, we incurred costs of approximately $129.0 million for research and development activities relating to our cardiac muscle contractility program, $29.0 million for our skeletal muscle contractility program, $30.8 million for our smooth muscle contractility program, $70.5 million for our mitotic kinesin inhibitors, $53.5 million for our proprietary technologies and $54.7 million for other research programs.

General and Administrative Expenses

     General and administrative expenses consist primarily of compensation for employees in executive and administrative functions, including, but not limited to, finance, human resources, legal, business and commercial development and strategic planning. Other significant costs include facilities costs and professional fees for accounting and legal services, including legal services associated with obtaining and maintaining patents and regulatory compliance. We expect that general and administrative expenses will continue to increase in the last quarter of 2009.

Restructuring

     In September 2008, we announced a restructuring plan to realign our workforce and operations in line with a strategic reassessment of our research and development activities and corporate objectives. As a result, at the time, we focused our research activities to our muscle contractility programs while continuing our then-ongoing clinical trials in heart failure and cancer, and discontinued early research activities directed to oncology. To implement this plan, we reduced our workforce at the time by approximately 29%, or 45 employees, to 112 employees. The affected employees were provided with severance and related benefits payments and outplacement assistance.

     We have completed substantially all restructuring activities and recognized all anticipated restructuring charges. All severance payments were made as of December 31, 2008.

     As a result of the restructuring plan, in 2008 we recorded total restructuring charges of $2.2 million for employee severance and benefit related costs and a $0.3 million charge related to the impairment of lab equipment that is held for sale. In the first nine months of 2009, we recorded a net reduction in restructuring charges of $23,000, representing primarily the reversal of employee benefit related accruals partially offset by impairment losses on held-for-sale equipment. We are seeking to dispose of the remaining held-for-sale equipment.

Stock Compensation

     The following table summarizes stock-based compensation related to employee stock options, restricted stock awards and employee stock purchases for the three and nine months ended September 30, 2009 and September 30, 2008, which was allocated as follows (in thousands):

		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Research and development		$	607			$	702			$	1,794			$	2,220
General and administrative			654				733				1,940				2,089
Stock-based compensation included in operating expenses		$	1,261			$	1,435			$	3,734			$	4,309

     As of September 30, 2009, there was $6.5 million of total unrecognized compensation cost related to non-vested stock-based compensation arrangements granted under our stock option plans. That cost is expected to be recognized over a weighted-average period of 2.4 years. The total unrecognized compensation expense related to restricted stock awards as of September 30, 2009 was $0.5 million and is expected to be recognized over a weighted-average period of 0.9 years. In addition, through 2008, we continued to amortize deferred stock-based compensation recorded for stock options granted prior to our initial public offering. The remaining balance became fully amortized in the fourth quarter of 2008.

Income Taxes

     We account for and report income taxes in accordance with the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. We did not record an income tax provision in the three and nine month periods ended September 30, 2009 and September 30, 2008 because we expected a net taxable loss for the full year in each of those periods. Given that we have a history of recurring losses, we have recorded a full valuation allowance against our net deferred tax assets.

     We also follow the accounting guidance that defines the threshold for recognizing the benefits of tax return positions in the financial statements as “more-likely-than-not” to be sustained by the taxing authorities based solely on the technical merits of the position. If the recognition threshold is met, the tax benefit is measured and recognized as the largest amount of tax benefit that, in our judgment, is greater than 50% likely to be realized. We are currently not undergoing any income tax examinations. In general, the statute of limitations for tax liabilities for these years remains open for the purpose of adjusting the amounts of the losses and credits carried forward from those years.

     Interest and penalties were zero for the three and nine month periods ended September 30, 2009 and September 30, 2008. We account for interest and penalties by classifying both as income tax expense in the financial statements. We do not expect our unrecognized tax benefits, net of valuation allowances necessary to reflect our expectations of realizability, to change materially over the next 12 months.

Results of Operations

Revenues

     We recorded total revenues of $5.5 million and $3.1 million for the third quarter of 2009 and 2008, respectively, and $80.5 million and $9.3 million for the first nine months of 2009 and 2008, respectively.

     Research and development revenues from related parties refers to research and development revenues from our strategic alliance with Amgen and GSK. Research and development revenues from Amgen were $5.5 million and zero in the third quarter of 2009 and 2008, respectively, and $6.1 and zero for the first nine months of 2009 and 2008, respectively. Research and development revenues of $5.5 million from Amgen for the third quarter of 2009 consisted of $4.0 million for the transfer of the majority of the Company’s existing inventories of omecamtiv mecarbil and related reference materials, and $1.5 million for FTE and out of pocket expense reimbursements. Research and development revenues of $6.1 million from Amgen for the first nine months of 2009 consisted of $4.0 million for the transfer of the majority of the Company’s existing inventories of omecamtiv mecarbil and related reference materials, and $2.1 million for FTE and out of pocket expense reimbursements. Research and development revenues from GSK were $19,000 and $67,000 in the third quarter 2009 and 2008, respectively, and $45,000 and $93,000 for the first nine months of 2009 and 2008, respectively. Research and development revenues from GSK represented patent expense reimbursements.

     License revenues from related parties refers to license revenues from our strategic alliance with Amgen. License revenues were zero and $3.1 million for the third quarter of 2009 and 2008, respectively, and $74.4 million and $9.2 million for the first nine months of 2009 and 2008, respectively. License revenues for first nine months of 2009 consisted of the June 2009 $50.0 million option exercise fee received from Amgen and the recognition of deferred revenue of $24.4 million related to the 2006 upfront non-exclusive license and technology access fee and stock purchase premium from Amgen. License revenue for the third quarter and first nine months of 2008 of $3.1 million and $9.2 million, respectively, consisted of amortization of the 2006 upfront non-exclusive license and

technology access fee and stock purchase premium from Amgen.

     Deferred revenue related to the Amgen agreement and the related common stock purchase agreement between the Company and Amgen was $0.7 million at September 30, 2009 and $24.5 million at December 31, 2008. The deferred revenue balance at September 30, 2009 related to Amgen’s prepayment of FTE reimbursements. The deferred revenue balance at December 31, 2008 represented the unrecognized portion of the non-exclusive license and technology access fee and stock purchase premium from 2006.

Research and Development Expenses

     Research and development expenses were $9.9 million in the third quarter of 2009, down from $13.5 million in the third quarter of 2008, and $30.0 million for the first nine months of 2009, down from $42.5 million in the first nine months of 2008. The $3.6 million decrease in research and development expense in the third quarter of 2009, compared to the same period in 2008, was primarily due to lower clinical and preclinical outsourcing costs of $2.6 million related to our muscle contractility and mitotic kinesin inhibitors clinical trial programs and a decrease of $1.0 million for personnel related costs. The $12.5 million decrease in the first nine months of 2009, compared to the same period in 2008, was primarily due to decreases in clinical and preclinical outsourcing costs of $7.4 million related to our muscle contractility and mitotic kinesin inhibitors clinical trial programs and preclinical outsourcing costs, $2.9 million for personnel related costs and $1.8 million for laboratory and facility related costs.

     From a program perspective, the decline in spending in the third quarter of 2009, compared to the third quarter of 2008, was due to decreased spending of $3.4 million for our cardiac muscle contractility program, $0.2 million for our smooth muscle contractility program, $1.0 million for our mitotic kinesin inhibitors program, $0.4 million for our proprietary technologies and $1.0 million for our other research and preclinical programs, partially offset by an increase of $2.4 million for our skeletal muscle contractility program. For the first nine months of 2009, compared to the first nine months of 2008, the decline in spending was due to decreases of $6.6 million for our cardiac muscle contractility program, $1.5 million for our smooth muscle contractility program, $2.7 million for our mitotic kinesin inhibitors program, $1.5 million for our proprietary technologies and $3.3 million for our other research and preclinical programs, partially offset by an increase of $3.1 million for our skeletal muscle contractility program.

     Research and development expenses incurred related to the following programs (in millions):

		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Cardiac muscle contractility		$	1.8			$	5.2			$	9.1				15.7
Skeletal muscle contractility			4.9				2.5				10.6				7.5
Smooth muscle contractility			1.2				1.4				4.3				5.8
Mitotic kinesin inhibitors			0.9				1.9				3.2				5.9
Proprietary technologies			0.4				0.8				0.9				2.4
All other research programs			0.7				1.7				1.9				5.2
Total research and development expenses		$	9.9			$	13.5			$	30.0			$	42.5

     We recognized revenue from Amgen for reimbursement of research and development costs of $5.5 million and zero for the third quarter of 2009 and 2008, respectively, and $6.1 million and zero for the first nine months of 2009 and 2008, respectively. The research and development revenue from Amgen in 2009 represents the recording of FTE and out of pocket expense reimbursements, and the sale of clinical trial and related materials from our cardiac muscle contractility development program. In the third quarter of 2009, pursuant to the Amgen agreement, we transferred to Amgen for $4.0 million the majority of our existing inventories of omecamtiv mecarbil and related reference materials Our out of pocket costs for the transferred materials were incurred and recorded as research and development expense in prior periods. We recorded total research and development revenues under the Amgen agreement of $5.5 million in the three months ended September 30, 2009, including $4.0 million for the material transferred and $1.5 million for FTE and out of pocket expense reimbursements. For the nine months ended September 30, 2009, we recorded total research and development revenues under the Amgen agreement of $6.1 million, including $4.0 million for the material transferred and $2.1 million for FTE and out of pocket expense reimbursements. The FTE reimbursements from Amgen are at negotiated rates that approximate our costs, which we believe approximate fair value.

     We recognized revenue from GSK for reimbursement of patent costs related to mitotic kinesin inhibitors of $19,000 and $67,000 for the third quarter of 2009 and 2008, respectively, and $45,000 and $93,000 for the first nine months of 2009 and 2008, respectively. We recorded these reimbursements as related party research and development revenue.

     Clinical development timelines, likelihood of success and total completion costs vary significantly for each drug candidate and are difficult to estimate. We anticipate that we will determine on an on-going basis which early research programs to pursue and how much funding to direct to each program taking into account the scientific and clinical success of each drug candidate. The lengthy process of seeking regulatory approvals and subsequent compliance with applicable regulations requires the expenditure of substantial resources. Any failure by us to obtain and maintain, or any delay in obtaining, regulatory approvals could cause our research and development expenditures to increase and, in turn, could have a material adverse effect on our results of operations.

     We expect our research and development expenditures to decrease for the full year 2009, compared to 2008, as a result of our restructuring in September 2008 and the prioritization of our development programs. We expect to continue development of our drug candidate omecamtiv mecarbil for the potential treatment of heart failure, our drug candidate CK-2017357 for the potential treatment of diseases and medical conditions associated with muscle weakness or wasting, and our smooth muscle myosin inhibitor for the potential treatment of pulmonary arterial hypertension and diseases and medical conditions associated with bronchoconstriction. We also expect to continue to incur costs associated with the close-out of each of the clinical trials of our drug candidates ispinesib and SB-743921 for the potential treatment of cancer. For the year ending December 31, 2009, we anticipate research and development expenses will be in the range of $44.0 million to $49.0 million. Non-cash expenses such as stock-based compensation and depreciation of approximately $4.4 million are included in the 2009 research and development expenses.

General and Administrative Expenses

     General and administrative expenses were $3.9 million and $3.8 million in the third quarter of 2009 and 2008, respectively. There were no major fluctuations in any area of spending. General and administrative expenses were $12.0 million and $12.2 million in the first nine months of 2009 and 2008, respectively. The decrease in the first nine months of 2009 was primarily due to a decrease in legal expenses of $0.7 million, partially offset by an increase in personnel expenses of $0.4 million. The increase in personnel expense in the first nine months of 2009, compared to the first nine months of 2008, was primarily due to an employee special bonus in recognition of our employees’ contributions that resulted in Amgen exercising its option for an exclusive license to our cardiac muscle contractility program and our closing of the registered direct equity offering in the second quarter of 2009, partially offset by decreases in salaries and stock-based compensation.

     We expect that general and administrative expenses will increase in 2009 from 2008 levels. For the year ending December 31, 2009, we anticipate general and administrative expenses will be in the range of $18.0 million to $20.0 million. Non-cash expenses such as stock-based compensation and depreciation of approximately $3.0 million are included in the 2009 general and administrative expenses.

Restructuring Expenses

     Restructuring expenses were ($21,000) in the third quarter of 2009, and primarily consisted of reductions of accrued employee benefit related accrued restructuring costs and gains on disposals of held-for-sale equipment. Restructuring expenses were ($23,000) in the first nine months of 2009 and primarily consisted of a reduction of accrued employee benefit related restructuring costs partially offset by impairment charges for held-for-sale equipment. In September 2008, we announced a restructuring plan to realign our workforce and operations in line with a strategic reassessment of our research and development activities and corporate objectives. As a result of the restructuring plan, in the three and nine months ended September 2008 we recorded total restructuring charges of $2.2 million for employee severance and benefit related costs and a $0.3 million charge related to the impairment of lab equipment that was held for sale. We are seeking to dispose of the remaining held-for-sale equipment.

Interest and Other, net

     Components of Interest and Other, net are as follows (in millions):

		Three Months Ended								Nine Months Ended
		September 30,				September 30,				September 30,				September 30,
		2009				2008				2009				2008
Unrealized gain on ARS		$	0.4			$	—			$	1.0			$	—
Unrealized loss on investment put option related to ARS rights			(.04	)			—				(1.0	)			—
Warrant expense			—				—				(1.6	)			—
Interest income and other income			0.1				0.6				0.5				2.8
Interest expense and other expense			(0.1	)			(0.1	)			(0.3	)			(0.4	)
Interest and Other, net		$	—			$	0.5			$	(1.4	)		$	2.4

     Interest income and other income decreased in the third quarter of 2009 compared to the third quarter of 2008 due to lower market interest rates earned on our investments, partially offset by higher average invested balances of cash, cash equivalents and investments. Interest income and other income decreased in the first nine months of 2009 compared to the same period in 2008 due to lower market interest rates and lower average invested balances.

     Interest expense and other expense primarily consisted of interest expense on our equipment financing line of credit, and, for the third quarter and first nine months of 2009, interest expense on our loan with UBS Bank USA.

Critical Accounting Policies

     The accounting policies that we consider to be our most critical (i.e., those that are most important to the portrayal of our financial condition and results of operations and that require our most difficult, subjective or complex judgments), the effects of those accounting policies applied and the judgments made in their application are summarized in “ Item 7—Management’s Discussion and

Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2008.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

     We adopted the new accounting guidance for determining fair value when the volume and level of activity for an asset or liability have significantly decreased and for identifying transactions that are not orderly. The new guidance provides additional direction for determining fair values when there is no active market or where the price inputs represent distressed sales. The new guidance reaffirms existing guidance that fair value is the amount for which an asset would be sold in an orderly transaction (as opposed to a forced liquidation or distressed sale) under current market conditions at the date of the financial statements. The new guidance amends the disclosure provisions of existing guidance to require entities to disclose the valuation inputs and techniques in interim and annual financial statements, and to disclose fair value hierarchies and the Level 3 reconciliation by major security types. Our adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on our financial position or results of operations.

     We adopted the new accounting guidance on interim disclosures about the fair value of financial instruments. The new guidance amends the existing guidance to require public companies to provide disclosures about the fair value of financial instruments in interim and annual financial statements. Our adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on our financial position or results of operations.

     We adopted the new accounting guidance for recognition and presentation of other-than-temporary impairments. The new guidance provides additional direction for determining the credit and non-credit components of other-than-temporary impairments of debt securities classified as available-for-sale or held-to-maturity. The guidance also increases and clarifies existing disclosure requirements and extends the disclosure frequency to interim and annual periods. Our adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on our financial position or results of operations.

     We adopted the new accounting guidance for subsequent events, which establishes general standards of accounting for and disclosure of events that occur after the balance sheet date but before financial statements are issued or are available to be issued. It provides guidance regarding the period after the balance sheet date during which management should evaluate events or transactions for potential recognition or disclosure in the financial statements, the circumstances under which an entity should recognize events or transactions occurring after the balance sheet date, and the disclosures that an entity should make about events or transactions that occurred after the balance sheet date. Our adoption of the new guidance in the quarter ended June 30, 2009 did not have a material impact on our financial position or results of operations.

     We adopted the Financial Accounting Standards Board’s (“FASB”) new guidance on the hierarchy and sources of accounting principles generally accepted in the United States of America (“GAAP”). The new guidance identifies the sources of accounting principles and the framework for selecting the principles used in the preparation of financial statements of nongovernmental entities that are presented in conformity with GAAP in the United States. The guidance establishes the FASB Accounting Standards Codification (the “Codification”) as the source of authoritative accounting principles recognized by the FASB to be applied by nongovernmental entities in the preparation of financial statements in conformity with GAAP. The issuance of the Codification did not change GAAP. Our adoption of the new guidance in the quarter ended September 30, 2009 did not have a material impact on our financial position or results of operations. However, all references to GAAP literature in our current and historical filings are superseded by references to the Codification.

Accounting Pronouncements Not Yet Adopted

     In August 2009, the FASB issued new accounting guidance for measuring liabilities at fair value. The new guidance amends existing guidance to provide clarification on how to measure the fair value of a liability in circumstances in which a quoted price in an active market for the identical liability is not available. It also clarifies that when estimating the fair value of a liability, an entity is not required to include or adjust an input relating to a restriction that prevents the transfer of the liability. The new guidance also clarifies that the quoted price for an identical liability when traded as an asset in an active market may be used as a Level 1 fair value measurement for a liability. We will adopt the new guidance in the quarter ending December 31, 2009, and do not expect that the adoption will have a material impact on our financial position or results of operations.

     In October 2009, the FASB issued new accounting guidance for recognizing revenue for a multiple-deliverable revenue arrangement. The new guidance amends the existing guidance for separately accounting for individual deliverables in a revenue arrangement with multiple deliverables, and removes the criterion that an entity must use objective and reliable evidence of fair value to separately account for the deliverables. The new guidance also establishes a hierarchy for determining the value of each deliverable and establishes the relative selling price method for allocating consideration when vendor specific objective evidence or third party evidence of value does not exist. We must adopt the new guidance prospectively for new revenue arrangements entered into or materially modified beginning in the first quarter of 2011. Earlier adoption is permitted. We are currently evaluating the impact that the new guidance will have on our financial statements and the timing of its adoption.

Liquidity and Capital Resources

     From August 5, 1997, our date of inception, through September 30, 2009, we funded our operations through the sale of equity securities, equipment financings, non-equity payments from collaborators, government grants and interest income.

     Our cash, cash equivalents, investments and ARS, excluding restricted cash and the investment put option related to the Series C-2 Auction Rate Securities Rights issued to us by UBS AG (the “ARS Rights”), totaled $119.2 million at September 30, 2009, up from $73.5 million at December 31, 2008. The increase of $45.7 million was primarily due to our receipt of a $50.0 million option exercise fee from Amgen and net proceeds of $12.9 million from our registered direct equity offering, $12.4 from the loan with UBS Bank USA, and $6.8 million from the 2007 committed equity financing facility with Kingsbridge, partially offset by operating expenses.

     We have received net proceeds from the sale of equity securities of $335.5 million from August 5, 1997, the date of our inception, through September 30, 2009, excluding sales of equity to GSK and Amgen. Included in these proceeds are $94.0 million received upon closing of the initial public offering of our common stock in May 2004. In connection with execution of our collaboration and license agreement in 2001, GSK made a $14.0 million equity investment in Cytokinetics. GSK made additional equity investments in Cytokinetics in 2003 and 2004 of $3.0 million and $7.0 million, respectively.

     In 2005, we entered into our first committed equity financing facility with Kingsbridge, pursuant to which Kingsbridge committed to finance up to $75.0 million of capital for a three-year period. Subject to certain conditions and limitations, from time to time under this committed equity financing facility, at our election, Kingsbridge purchased newly-issued shares of our common stock at a price between 90% and 94% of the volume-weighted average price on each trading day during an eight day, forward-looking pricing period. We received gross proceeds from sales of our common stock to Kingsbridge under this facility as follows: 2005 — gross proceeds of $5.7 million from the sale of 887,576 shares, before offering costs of $178,000; 2006 — gross proceeds of $17.0 million from the sale of 2,740,735 shares; and 2007 — gross proceeds of $9.5 million from the sale of 2,075,177 shares. No further draw downs are available to us under the 2005 Kingsbridge committed equity financing facility.

     In October 2007, we entered into a new committed equity financing facility with Kingsbridge (the “2007 CEFF”), pursuant to which Kingsbridge committed to finance up to $75.0 million of capital for a three-year period. Subject to certain conditions and limitations, which include a minimum volume-weighted average price of $2.00 for our common stock, from time to time under this facility, at our election, Kingsbridge is committed to purchase newly-issued shares of our common stock at a price between 90% and 94% of the volume-weighted average price on each trading day during an eight day, forward-looking pricing period. The maximum number of shares we may issue in any pricing period is the lesser of 2.5% of our market capitalization immediately prior to the commencement of the pricing period or $15.0 million. As part of the 2007 CEFF arrangement, we issued a warrant to Kingsbridge to purchase 230,000 shares of our common stock at a price of $7.99 per share, which represents a premium over the closing price of our common stock on the date we entered into this facility. This warrant became exercisable beginning six months after October 2007 and will remain exercisable for a period of three years thereafter. We may sell a maximum 9,779,411 shares under the 2007 CEFF (exclusive of the shares underlying the warrant). Under the rules of the NASDAQ Stock Market LLC, this is approximately the maximum number of shares we may sell to Kingsbridge without our stockholders’ approval. This restriction may further limit the amount of proceeds we are able to obtain from the 2007 CEFF. We are not obligated to sell any of the $75.0 million of common stock available under this committed equity financing facility and there are no minimum commitments or minimum use penalties. The 2007 CEFF does not contain any restrictions on our operating activities, any automatic pricing resets or any minimum market volume restrictions. As of November 5, 2009, we have received gross proceeds of $6.9 million by selling 3,596,728 shares of our common stock to Kingsbridge under the 2007 CEFF, before offering costs of $0.1 million. 6,182,683 shares remain available to the Company for sale under the 2007 CEFF as of September 30, 2009.

     In January 2006, we entered into a stock purchase agreement with certain institutional investors relating to the issuance and sale of 5,000,000 shares of our common stock at a price of $6.60 per share, for gross offering proceeds of $33.0 million. In connection with this offering, we paid an advisory fee to a registered broker-dealer of $1.0 million. After deducting the advisory fee and the offering costs, we received net proceeds of approximately $32.0 million from the offering.

     In December 2006, we entered into stock purchase agreements with selected institutional investors relating to the issuance and sale of 5,285,715 shares of our common stock at a price of $7.00 per share, for gross offering proceeds of $37.0 million. In connection with this offering, we paid placement agent fees to three registered broker-dealers totaling $1.9 million. After deducting the placement agent fees and the offering costs, we received net proceeds of approximately $34.9 million from the offering.

     In January 2007, we received a $42.0 million upfront non-exclusive license and technology access fee from Amgen in connection with our entry into our collaboration and option agreement in December 2006. Contemporaneously with entering into this agreement, we entered into a common stock purchase agreement with Amgen under which Amgen purchased 3,484,806 shares of our common stock at a price per share of $9.47, including a premium of $1.99 per share, and an aggregate purchase price of approximately $33.0 million. After deducting the offering costs, we received net proceeds of approximately $32.9 million. These shares were issued, and the related proceeds received, in January 2007. In June 2009, we received a $50.0 million option exercise fee from Amgen.

     In May 2009, pursuant to a registered direct equity offering, we entered into subscription agreements with selected institutional investors to sell an aggregate of 7,106,600 units for a price of $1.97 per unit. Each unit consisted of one share of our common stock and one warrant to purchase 0.50 shares of our common stock. Accordingly, a total of 7,106,600 shares of common stock and warrants

to purchase 3,553,300 shares of common stock were issued and sold in this offering. The gross proceeds of the offering were $14.0 million. In connection with the offering, we paid placement agent fees to two registered broker-dealers totaling $0.8 million. After deducting the placement agent fees and the offering costs, we received net proceeds of approximately $12.9 million from the offering.

     As of September 30, 2009, we have received $94.3 million in non-equity payments from Amgen and $54.5 million in non-equity payments from GSK.

     Under equipment financing arrangements, we received $23.7 million from August 5, 1997, the date of our inception, through September 30, 2009. Interest earned on investments, excluding non-cash amortization/accretion of purchase premiums/discounts was $1.1 million in the first nine months of 2009, and $27.4 million from August 5, 1997, the date of our inception, through September 30, 2009.

     Net cash provided by operating activities was $14.8 million in the first nine months of 2009 and primarily resulted from net income of $37.1 million, partially offset by a $23.8 million decrease in deferred revenue. Net income in the period primarily resulted from the recognition of $74.4 million of license revenue and $6.1 million of research and development revenue from Amgen, partially offset by cash operating expenses. Deferred revenue decreased to $0.7 million as of September 30, 2009 from $24.5 million at December 31, 2008, because we recognized as revenue the remaining balance of the Amgen deferred revenue when the non-exclusive license period ended in the second quarter of 2009 upon Amgen’s exercise of its option. The balance of deferred revenue of $0.7 million at September 30, 2009 consisted of prepayments of FTE reimbursements. Net cash used in operating activities in first nine months of 2008 was $48.3 million and primarily resulted from the net loss of $45.5 million.

     Net cash used in investing activities was $62.0 million in the first nine months of 2009 and primarily represented cash used to purchase investments, net of proceeds from the maturity of investments and ARS, of $62.8 million. Restricted cash totaled $1.7 million at September 30, 2009, down from $2.8 million at December 31, 2008, with the decrease due to the contractual semi-annual reductions in the amount of security deposit required by our lender. Net cash provided by investing activities in the first nine months of 2008 was $5.1 million and primarily represented proceeds from the maturity of investments, net of investment purchases, of $3.2 million, and a $2.4 million decrease in the amount of cash required to be held in our restricted cash account.

     Net cash provided by financing activities was $29.1 million in the first nine months of 2009 and primarily consisted of net proceeds from our May 2009 registered direct equity offering of $12.9 million, proceeds from our loan from UBS Bank USA of $12.4 million, and drawdowns under our 2007 committed equity financing facility with Kingsbridge of $6.8 million, net of issuance costs. Net cash used in financing activities in the first nine months of 2008 was $2.8 million and primarily represented principal payments on our lines of credit with General Electric Capital Corporation.

     Auction Rate Securities (“ARS”). Our long-term investments at September 30, 2009 included (at par value) $18.1 million of ARS. These ARS were intended to provide liquidity via an auction process that resets the applicable interest rate at predetermined calendar intervals, allowing investors to either roll over their holdings or gain immediate liquidity by selling such interests. With the liquidity issues experienced in global credit and capital markets, these ARS have experienced multiple failed auctions since February 2008, as the amount of securities submitted for sale has exceeded the amount of purchase orders. As a result, these securities are currently not liquid.

     The assets underlying these ARS are student loans that are substantially backed by the federal government. As of September 30, 2009, our ARS with par values totaling $13.3 million had a credit rating of AAA, ARS with par values totaling $0.3 million had a credit rating of Aa1, and ARS with par values totaling $4.5 million had a credit rating of A3. All of these securities continue to pay interest according to their stated terms (generally 120 basis points over the ninety-one day U.S. Treasury bill rate) with interest rates resetting every 28 days. These ARS are scheduled to ultimately mature between 2036 and 2045, although we do not intend to hold them until maturity. We intend to liquidate the ARS investments on June 30, 2010, the earliest date we can exercise the ARS Rights.

     The valuation of our ARS investment portfolio is subject to uncertainties that are difficult to predict. The fair values of these ARS as of September 30, 2009 were estimated utilizing a discounted cash flow analysis. The assumptions used in preparing the discounted cash flow model include estimates of interest rates, timing and amount of cash flows, credit and liquidity premiums and expected holding periods of the ARS, based on data available. These assumptions are volatile and subject to change as the underlying sources of these assumptions and market conditions change, which could result in significant changes to the fair value of the ARS. The significant assumptions of this discounted cash flow model are discount margins which are based on industry recognized student loan sector indices, an additional liquidity discount and an estimated term to liquidity. Other items this analysis considers are the collateralization underlying the security investments, the creditworthiness of the counterparty and the timing of expected future cash flows. These ARS were also compared, when possible, to other observable market data with similar characteristics as the securities held by us. The fair value of our investments in ARS as of September 30, 2009 and December 31, 2008 was determined to be $15.8 million and $16.6 million, respectively. Changes in the fair value of the ARS are recognized in current period earnings in Interest and Other, net. Accordingly, we recognized $1.0 million of unrealized gain in the first nine months of 2009.

     In connection with the failed auctions of our ARS, which were marketed and sold by UBS AG and its affiliates, in October 2008, we accepted a settlement with UBS AG pursuant to which UBS AG issued to us the ARS Rights. The ARS Rights provide us the right

to receive the par value of our ARS, i.e., the liquidation preference of the ARS plus accrued but unpaid interest. Pursuant to the ARS Rights, we may require UBS to purchase our ARS at par value at any time between June 30, 2010 and July 2, 2012. In addition, UBS or its affiliates may sell or otherwise dispose of some or all of the ARS at its discretion at any time prior to expiration of the ARS Rights, subject to the obligation to pay us the par value of such ARS. The ARS Rights are not transferable, tradable or marginable, and will not be listed or quoted on any securities exchange or any electronic communications network. As consideration for ARS Rights, we agreed to release UBS AG, UBS Securities LLC and UBS Financial Services, Inc., and/or their affiliates, directors, and officers from any claims directly or indirectly relating to the marketing and sale of the ARS, other than for consequential damages. UBS’s obligations in connection with the ARS Rights are not secured by its assets and UBS is not required to obtain any financing to support these obligations. UBS has disclaimed any assurance that it will have sufficient financial resources to satisfy its obligations in connection with the ARS Rights. If UBS has insufficient funding to buy back the ARS and the auction process continues to fail, we may incur further losses on the carrying value of the ARS.

     The ARS Rights represent a firm agreement in accordance with accounting guidance for derivatives and hedging. The guidance defines a firm agreement as an agreement with an unrelated party, binding on both parties and usually legally enforceable, with the following characteristics: a) the agreement specifies all significant terms, including the quantity to be exchanged, the fixed price and the timing of the transaction; and b) the agreement includes a disincentive for nonperformance that is sufficiently large to make performance probable. The enforceability of the ARS Rights results in a put option, which we recognized as a separate freestanding instrument that is accounted for separately from the ARS investments. As of September 30, 2009, we recorded $2.4 million as the fair value of the investment put option related to the ARS Rights, classified as short-term assets on the balance sheet. The investment put option does not meet the definition of a derivative instrument. Therefore, we elected to measure the investment put option related to the ARS Rights at fair value, as permitted under accounting guidance for the fair value option for accounting for financial assets and liabilities, to mitigate volatility in reported earnings due to their linkage to the ARS. We valued the investment put option related to the ARS Rights using a Black-Scholes option pricing model that included estimates of interest rates, based on data available, and was adjusted for any bearer risk associated with UBS’s financial ability to repurchase the ARS beginning June 30, 2010. Any change in the assumptions on which these estimates are based or market conditions would affect the fair value of the investment put option related to the ARS Rights. We anticipate that any future changes in the fair value of the investment put option will be offset by the changes in the fair value of the related ARS with no material net impact to the statements of operations, subject to changes in UBS’s credit risk rating and its ultimate ability to perform. The investment put option related to the ARS Rights will continue to be measured at fair value until the earlier of our exercise of the ARS Rights, UBS’s purchase of the ARS in connection with the ARS Rights or the maturity of the ARS underlying the ARS Rights.

     In connection with the settlement with UBS AG relating to our ARS, we entered into a loan agreement with UBS Bank USA and UBS Financial Services Inc. On January 5, 2009, we borrowed approximately $12.4 million under the loan agreement, with our ARS held in accounts with UBS and its affiliates as collateral. The loan amount was based on 75% of the fair value as assessed by UBS at the time of the loan. We have drawn down the full amount available under the loan agreement. In general, the amount of interest payable under the loan agreement is intended to equal the amount of interest we would otherwise receive with respect to our ARS. During the third quarter of 2009, the interest rate due on the UBS loan was higher than the interest rate earned from the ARS. During the first nine months of 2009, the interest rate due on the UBS loan was approximately the same as the interest rate earned from the ARS. The principal balance of the loan was lower than the par value of the ARS year to date through September 30, 2009. During the nine months ended September 30, 2009, we paid $122,000 of interest expense associated with the loan and received $218,000 in interest income from the ARS. In accordance with the loan agreement, we applied the net interest received of $96,000 and proceeds from ARS sales of $1.9 million to the principal of the loan. The borrowings under the loan agreement are payable upon demand. However, UBS Financial Services Inc. or its affiliates will be required to arrange alternative financing for us on terms and conditions substantially the same as those under the loan agreement, unless the demand right was exercised as a result of certain specified events or the customer relationship between UBS and us is terminated for cause by UBS. If such alternative financing cannot be established, then a UBS affiliate will purchase the pledged ARS at par value. Proceeds of sales of the ARS will first be applied to repayment of the loan with the balance, if any, for our account.

     We continue to monitor the market for ARS and consider its impact (if any) on the fair market value of our investments. If the market conditions deteriorate further, we may be required to record additional unrealized losses in earnings, offset by corresponding increases in the investment put option related to the ARS Rights, assuming no deterioration of UBS’s credit rating. At present, if we need to access the funds that are in an illiquid state, we may not be able to do so without the possible loss of principal until a future auction for these investments is successful, another secondary market evolves for these securities, they are redeemed by the issuer or they mature. If we are unable to sell these securities in the market or they are not redeemed, we could be required to hold them to maturity. We will continue to monitor and evaluate these investments for impairment on an ongoing basis.

     Shelf Registration Statement. In November 2008, we filed a shelf registration statement with the SEC, which was declared effective in November 2008. The shelf registration statement allows us to issue shares of our common stock from time to time for an aggregate offering amount of up to $100 million. As of November 5, 2009, $76.2 million remains available to us under this shelf registration statement, assuming all outstanding warrants are exercised in cash. The specific terms of offerings, if any, under the shelf registration statement would be established at the time of such offerings.

     As of September 30, 2009, future minimum payments under our loan and lease obligations were as follows (in thousands):

		Within				One to				Three to				After
		One Year				Three Years				Five Years				Five Years				Total
Operating leases (1)		$	3,064			$	4,987			$	1,826			$	—			$	9,877
Equipment financing line			1,725				1,338				—				—				3,063
Loan with UBS (2)			10,470				—				—				—				10,470
Total		$	15,259			$	6,325			$	1,826			$	—			$	23,410

     In future periods, we expect to incur substantial costs as we continue to expand our research programs and related research and development activities. We also plan to continue to conduct clinical development of our cardiac muscle myosin activator omecamtiv mecarbil for the potential treatment of heart failure, of ispinesib for the potential treatment of breast cancer and of SB-743921 for the potential treatment of Hodgkin and non-Hodgkin lymphoma. We have initiated a Phase I, first-in-humans clinical trial of our fast skeletal muscle troponin activator, CK-2017357, under an U.S. IND and we plan to progress our smooth muscle myosin inhibitor through IND-enabling studies and clinical development. We expect to incur significant research and development expenses as we advance the research and development of our other muscle contractility programs through research to candidate selection.

     Our future capital uses and requirements depend on numerous factors. These factors include, but are not limited to, the following:

	•		the initiation, progress, timing, scope and completion of preclinical research, development and clinical trials for our drug candidates and potential drug candidates;
	•		the time and costs involved in obtaining regulatory approvals;
	•		delays that may be caused by requirements of regulatory agencies;
	•		Amgen’s decisions with regard to funding of development and commercialization of omecamtiv mecarbil or other compounds for the potential treatment of heart failure under our collaboration;
	•		GSK’s decisions with regard to funding of development and commercialization of GSK-923295 under our collaboration;
	•		our level of funding for the development of current or future drug candidates;
	•		the number of drug candidates we pursue;
	•		the costs involved in filing and prosecuting patent applications and enforcing or defending patent claims;
	•		our ability to establish and maintain selected strategic alliances required for the development and commercialization of our potential drugs;
	•		our plans or ability to expand our drug development capabilities, including our capabilities to conduct clinical trials for our drug candidates;
	•		our plans or ability to establish sales, marketing or manufacturing capabilities and to achieve market acceptance for potential drugs;
	•		the expansion and advancement of our research programs;
	•		the hiring of additional employees and consultants;
	•		the expansion of our facilities;
	•		the acquisition of technologies, products and other business opportunities that require financial commitments; and
	•		our revenues, if any, from successful development of our drug candidates and commercialization of potential drugs.

     We believe that our existing cash and cash equivalents, short-term investments, interest earned on investments, proceeds from our loan with UBS Bank USA, and proceeds already received from our equity financings will be sufficient to meet our projected operating requirements for at least the next 12 months.

     If, at any time, our prospects for internally financing our research and development programs decline, we may decide to reduce research and development expenses by delaying, discontinuing or reducing our funding of development of one or more of our drug candidates or potential drug candidates or of other research and development programs. Alternatively, we might raise funds through strategic relationships, public or private financings or other arrangements. There can be no assurance that funding, if needed, will be available on attractive terms, or at all. Furthermore, financing obtained through future strategic alliances may require us to forego certain commercialization and other rights to our drug candidates. Similarly, any additional equity financing may be dilutive to stockholders and debt financing, if available, may involve restrictive covenants. Our failure to raise capital as and when needed could have a negative impact on our financial condition and our ability to pursue our business strategy.

Off-balance Sheet Arrangements

     As of September 30, 2009, we did not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, which would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. In addition, we do not engage in trading activities involving non-exchange traded contracts. Therefore, we are not materially exposed to financing, liquidity, market or credit risk that could arise if we had engaged in these relationships. We do not have relationships or transactions with persons or entities that derive benefits from their non-independent relationship with us or our related parties.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

     Our exposure to market risk has not changed materially subsequent to our disclosures in Item 7A, “Quantitative and Qualitative Disclosures About Market Risk” in our Annual Report on Form 10-K for the year ended December 31, 2008.

ITEM 4. CONTROLS AND PROCEDURES

(a) Evaluation of disclosure controls and procedures

     Our management evaluated, with the participation and under the supervision of our Chief Executive Officer and our Chief Financial Officer, the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded, subject to the limitations described below, that our disclosure controls and procedures are effective to ensure that information we are required to disclose in reports that we file or submit under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms, and that such information is accumulated and communicated to management as appropriate to allow timely decisions regarding required disclosures.

(b) Changes in internal control over financial reporting

     There was no change in our internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

(c) Limitations on the Effectiveness of Controls

     A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the controls are met. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues, if any, within a company have been detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the objectives of our disclosure control system are met.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

     None.

ITEM 1A. RISK FACTORS

     In evaluating our business, you should carefully consider the following risks in addition to the other information in this report. Any of the following risks could materially and adversely affect our business, results of operations, financial condition or your investment in our securities, and many are beyond our control. It is not possible to predict or identify all such factors and, therefore, you should not consider any of these risk factors to be a complete statement of all the potential risks or uncertainties that we face.

Risks Related To Our Business

We have a history of significant losses and may not achieve or sustain profitability and, as a result, you may lose all or part of your investment.

     We have incurred operating losses in each year since our inception in 1997 due to costs incurred in connection with our research and development activities and general and administrative costs associated with our operations. Our drug candidates are in the early stages of clinical testing, and we must conduct significant additional clinical trials before we can seek the regulatory approvals necessary to begin commercial sales of our drugs. We expect to incur increasing losses for at least several more years, as we continue our research activities and conduct development of, and seek regulatory approvals for, our drug candidates, and commercialize any approved drugs. If our drug candidates fail or do not gain regulatory approval, or if our drugs do not achieve market acceptance, we will not be profitable. If we fail to become and remain profitable, or if we are unable to fund our continuing losses, you could lose all or part of your investment.

We will need substantial additional capital in the future to sufficiently fund our operations.

     We have consumed substantial amounts of capital to date, and our operating expenditures will increase over the next several years if we expand our research and development activities. We have funded all of our operations and capital expenditures with proceeds from private and public sales of our equity securities, strategic alliances with Amgen, GSK and others, equipment financings, interest on investments and government grants. We believe that our existing cash and cash equivalents, short-term investments, interest earned on investments, proceeds from our loan with UBS Bank USA and proceeds already received from our equity financings should be sufficient to meet our projected operating requirements for at least the next 12 months. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. Because of the numerous risks and uncertainties associated with the development of our drug candidates and other research and development activities, including risks and uncertainties that could impact the rate of progress of our development activities, we are unable to estimate with certainty the amounts of capital outlays and operating expenditures associated with these activities.

     For the foreseeable future, our operations will require significant additional funding, in large part due to our research and development expenses and the absence of any revenues from product sales. Until we can generate a sufficient amount of product revenue, we expect to raise future capital through strategic alliance and licensing arrangements, public or private equity offerings and debt financings. We do not currently have any commitments for future funding other than milestone and royalty payments that we may receive under our collaboration and option agreement with Amgen and our collaboration and license agreement with GSK. We may not receive any further funds under either of these agreements. Our ability to raise funds may be adversely impacted by current economic conditions, including the effects of the recent disruptions to the credit and financial markets in the United States and worldwide. In particular, the pool of third-party capital that in the past has been available to development-stage companies such as ours has decreased significantly in recent months, and such decreased availability may continue for a prolonged period. As a result of these and other factors, we do not know whether additional financing will be available when needed, or that, if available, such financing would be on terms favorable to our stockholders or us.

     To the extent that we raise additional funds through strategic alliance and licensing arrangements, we will likely have to relinquish valuable rights to our technologies, research programs or drug candidates, or grant licenses on terms that may not be favorable to us. To the extent that we raise additional funds by issuing equity securities, our stockholders will experience additional dilution. To the extent that we raise additional funds through debt financing, the financing may involve covenants that restrict our business activities. In addition, such funding, if needed, may not be available to us on favorable terms, or at all.

     If we can not raise the funds we need to operate our business, we will need to discontinue certain research and development activities and our stock price likely would be negatively affected.

We depend on Amgen for the conduct, completion and funding of the clinical development and commercialization of omecamtiv mecarbil (formerly known as CK-1827452).

     In May 2009, Amgen exercised its option to acquire an exclusive license to our drug candidate omecamtiv mecarbil worldwide, except for Japan. As a result, Amgen now is responsible for the clinical development and obtaining and maintaining regulatory approval of omecamtiv mecarbil for the potential treatment of heart failure worldwide, except Japan.

     We do not control the clinical development activities being conducted or that may be conducted in the future by Amgen, including, but not limited to, the timing of initiation, termination or completion of clinical trials, the analysis of data arising out of those clinical trials or the timing of release of data concerning those clinical trials, which may impact our ability to report on Amgen’s results. Amgen may conduct these activities more slowly or in a different manner than we would if we controlled the clinical development of omecamtiv mecarbil. For example, in October 2009, Amgen informed us that it wishes to conduct additional pharmacokinetic studies in heart failure patients receiving oral doses of omecamtiv mecarbil before commencing a Phase IIb study with omecamtiv mecarbil in this patient population. As a result, the start of the first Phase IIb trial for omecamtiv mecarbil is currently anticipated to occur in 2011. Amgen is responsible for filing future applications with the FDA or other regulatory authorities for approval of omecamtiv mecarbil and will be the owner of any marketing approvals issued by the FDA or other regulatory authorities for omecamtiv mecarbil. If the FDA or other regulatory authorities approve omecamtiv mecarbil, Amgen will also be responsible for the marketing and sale of the resulting drug, subject to our right to co-promote omecamtiv mecarbil in North America if we exercise our option to co-fund Phase III development costs of omecamtiv mecarbil under the collaboration. However, we cannot control whether Amgen will devote sufficient attention and resources to the clinical development of omecamtiv mecarbil or will proceed in an expeditious manner, even if we do exercise our option to co-fund the development of omecamtiv mecarbil. Even if the FDA or other regulatory agencies approve

omecamtiv mecarbil, Amgen may elect not to proceed with the commercialization of the resulting drug in one or more countries.

     Amgen generally has discretion to elect whether to pursue or abandon the development of omecamtiv mecarbil and may terminate our strategic alliance for any reason upon six months prior notice. If the initial results of one or more clinical trials with omecamtiv mecarbil do not meet Amgen’s expectations, Amgen may elect to terminate further development of omecamtiv mecarbil or certain of the potential clinical trials for omecamtiv mecarbil, even if the actual number of patients treated at that time is relatively small. If Amgen abandons omecamtiv mecarbil, it would result in a delay in or could prevent us from commercializing omecamtiv mecarbil, and would delay and could prevent us from obtaining revenues for this drug candidate. Disputes may arise between us and Amgen, which may delay or cause the termination of any omecamtiv mecarbil clinical trials, result in significant litigation or cause Amgen to act in a manner that is not in our best interest. If development of omecamtiv mecarbil does not progress for these or any other reasons, we would not receive further milestone payments or royalties on product sales from Amgen with respect to omecamtiv mecarbil. If Amgen abandons development of omecamtiv mecarbil prior to regulatory approval or if it elects not to proceed with commercialization of the resulting drug following regulatory approval, we would have to seek a new partner for clinical development or commercialization, curtail or abandon that clinical development or commercialization, or undertake and fund the clinical development of omecamtiv mecarbil or commercialization of the resulting drug ourselves. If we seek a new partner but are unable to do so on acceptable terms, or at all, or do not have sufficient funds to conduct the development or commercialization of omecamtiv mecarbil ourselves, we would have to curtail or abandon that development or commercialization, which could harm our business.

We have never generated, and may never generate, revenues from commercial sales of our drugs and we will not have drugs to market for at least several years, if ever.

     We currently have no drugs for sale and we cannot guarantee that we will ever develop or obtain approval to market any drugs. To receive marketing approval for any drug candidate, we must demonstrate that the drug candidate satisfies rigorous standards of safety and efficacy to the FDA in the United States and other regulatory authorities abroad. We and our partners will need to conduct significant additional research and preclinical and clinical testing before we or our partners can file applications with the FDA or other regulatory authorities for approval of any of our drug candidates. In addition, to compete effectively, our drugs must be easy to use, cost-effective and economical to manufacture on a commercial scale, compared to other therapies available for the treatment of the same conditions. We may not achieve any of these objectives. Currently, our only drug candidates in clinical trials are: omecamtiv mecarbil, our drug candidate for the potential treatment of heart failure; CK-2017357, our drug candidate for the potential treatment of diseases associated with aging, muscle wasting and neuromuscular dysfunction; and ispinesib, SB-743921 and GSK-923295, our drug candidates for the potential treatment of cancer. We cannot be certain that the clinical development of these or any future drug candidates will be successful, that they will receive the regulatory approvals required to commercialize them, or that any of our other research programs will yield a drug candidate suitable for clinical testing or commercialization. Our commercial revenues, if any, will be derived from sales of drugs that we do not expect to be commercially marketed for several years, if at all. The development of any one or all of these drug candidates may be discontinued at any stage of our clinical trials programs and we may not generate revenue from any of these drug candidates.

Clinical trials may fail to demonstrate the desired safety and efficacy of our drug candidates, which could prevent or significantly delay completion of clinical development and regulatory approval.

     Prior to receiving approval to commercialize any of our drug candidates, we must adequately demonstrate to the FDA and foreign regulatory authorities that the drug candidate is sufficiently safe and effective with substantial evidence from well-controlled clinical trials. In clinical trials we will need to demonstrate efficacy for the treatment of specific indications and monitor safety throughout the clinical development process and following approval. None of our drug candidates have yet been demonstrated to be safe and effective in clinical trials and they may never be. In addition, for each of our current preclinical compounds, we must adequately demonstrate satisfactory chemistry, formulation, stability and toxicity in order to submit an IND to the FDA, or an equivalent application in foreign jurisdictions, that would allow us to advance that compound into clinical trials. If our current or future preclinical studies or clinical trials are unsuccessful, our business will be significantly harmed and our stock price could be negatively affected.

     All of our drug candidates are prone to the risks of failure inherent in drug development. Preclinical studies may not yield results that would adequately support the filing of an IND (or a foreign equivalent) with respect to our potential drug candidates. Even if these applications are or have been filed with respect to our drug candidates, the results of preclinical studies do not necessarily predict the results of clinical trials. For example, although preclinical testing indicated that ispinesib causes tumor regression in a variety of tumor types, to date, Phase II clinical trials of ispinesib have not shown clinical activity in all of these tumor types. Similarly, for any of our drug candidates, the results from Phase I clinical trials in healthy volunteers and clinical results from Phase I and II trials in patients are not necessarily indicative of the results of larger Phase III clinical trials that are necessary to establish whether the drug candidate is safe and effective for the applicable indication.

     In addition, while the clinical trials of our drug candidates are designed based on the available relevant information, in view of the uncertainties inherent in drug development, such clinical trials may not be designed with focus on indications, patient populations, dosing regimens, safety or efficacy parameters or other variables that will provide the necessary safety or efficacy data to support regulatory approval to commercialize the resulting drugs. For example, in a number of two-stage Phase II clinical trials designed to evaluate the safety and efficacy of ispinesib as monotherapy in the first- or second-line treatment of patients with different forms of cancer, ispinesib did not satisfy the criteria for advancement to Stage 2. In addition, individual patient responses to the dose

administered of a drug may vary in a manner that is difficult to predict. Also, the methods we select to assess particular safety or efficacy parameters may not yield the same statistical precision in estimating our drug candidates’ effects as may other alternative methodologies. Even if we believe the data collected from clinical trials of our drug candidates are promising, these data may not be sufficient to support approval by the FDA or foreign regulatory authorities. Preclinical and clinical data can be interpreted in different ways. Accordingly, the FDA or foreign regulatory authorities could interpret these data in different ways than we or our partners do, which could delay, limit or prevent regulatory approval.

     Administering any of our drug candidates or potential drug candidates may produce undesirable side effects, also known as adverse effects. Toxicities and adverse effects observed in preclinical studies for some compounds in a particular research and development program may also occur in preclinical studies or clinical trials of other compounds from the same program. Potential toxicity issues may arise from the effects of the active pharmaceutical ingredient itself or from impurities or degradants that are present in the active pharmaceutical ingredient or could form over time in the formulated drug candidate or the active pharmaceutical ingredient. These toxicities or adverse effects could delay or prevent the filing of an IND (or a foreign equivalent) with respect to our drug candidates or potential drug candidates or cause us to cease clinical trials with respect to any drug candidate. If these or other adverse effects are severe or frequent enough to outweigh the potential efficacy of a drug candidate, the FDA or other regulatory authorities could deny approval of that drug candidate for any or all targeted indications. The FDA, other regulatory authorities, our partners or we may suspend or terminate clinical trials with our drug candidates at any time. Even if one or more of our drug candidates were approved for sale as drugs, the occurrence of even a limited number of toxicities or adverse effects when used in large populations may cause the FDA to impose restrictions on, or stop, the further marketing of those drugs. Indications of potential adverse effects or toxicities which do not seem significant during the course of clinical trials may later turn out to actually constitute serious adverse effects or toxicities when a drug is used in large populations or for extended periods of time.

     We have observed certain adverse effects in the clinical trials conducted with our drug candidates. For example, in clinical trials of omecamtiv mecarbil, intolerable doses were associated with complaints of chest discomfort, palpitations, dizziness and feeling hot, increases in heart rate, declines in blood pressure, electrocardiographic changes consistent with acute myocardial ischemia and transient rises in the MB fraction of creatine kinase and cardiac troponins I and T, which are indicative of myocardial infarction. In clinical trials of ispinesib, the most commonly observed dose-limiting toxicity was neutropenia, a decrease in the number of a certain type of white blood cell that results in an increase in susceptibility to infection. In a Phase I clinical trial of SB-743921, the dose-limiting toxicities observed were: prolonged neutropenia, with or without fever and with or without infection; elevated transaminases and hyperbilirubinemia, both of which are abnormalities of liver function; and hyponatremia, which is a low concentration of sodium in the blood.

     In addition, clinical trials of omecamtiv mecarbil, CK-2017357 and our anti-cancer drug candidates will enroll patients who typically suffer from serious diseases which put them at increased risk of death, and they may die while receiving our drug candidates. In such circumstances, it may not be possible to exclude with certainty a causal relationship to our drug candidate, even though the responsible clinical investigator may view such an event as not study drug-related. For example, in the Phase IIa clinical trial designed to evaluate and compare the oral pharmacokinetics of both modified and immediate release formulations of omecamtiv mecarbil in patients with stable heart failure, a patient died suddenly after receiving the immediate release formulation of omecamtiv mecarbil, without having reported any preceding adverse events. The clinical investigator assessed the patient’s death as not related to omecamtiv mecarbil. However, the event was reported to the appropriate regulatory authorities as possibly related to omecamtiv mecarbil because the immediate cause of the patient’s death could not be determined, and therefore, a relationship to omecamtiv mecarbil could not be excluded definitively.

     Any failure or significant delay in completing preclinical studies or clinical trials for our drug candidates, or in receiving and maintaining regulatory approval for the sale of any resulting drugs, may significantly harm our business and negatively affect our stock price.

     Clinical trials are expensive, time-consuming and subject to delay.

     Clinical trials are subject to rigorous regulatory requirements and are very expensive, difficult and time-consuming to design and implement. The length of time and number of trial sites and patients required for clinical trials vary substantially based on the type, complexity, novelty, intended use of the drug candidate and safety concerns. We estimate that the clinical trials of our current drug candidates will each continue for several more years. However, the clinical trials for all or any of these drug candidates may take significantly longer to complete. The commencement and completion of our clinical trials could be delayed or prevented by many factors, including, but not limited to:

	•		delays in obtaining, or inability to obtain, regulatory or other approvals to commence and conduct clinical trials in the manner we or our partners deem necessary for the appropriate and timely development of our drug candidates and commercialization of any resulting drugs;
	•		delays in identifying and reaching agreement, or inability to identify and reach agreement, on acceptable terms, with prospective clinical trial sites;

	•		delays or additional costs in developing, or inability to develop, appropriate formulations of our drug candidates for clinical trial use, including an appropriate modified release formulation for omecamtiv mecarbil;
	•		slower than expected rates of patient recruitment and enrollment, including as a result of competition for patients with other clinical trials; limited numbers of patients that meet the enrollment criteria; patients’, investigators’ or trial sites’ reluctance to agree to the requirements of a protocol; or the introduction of alternative therapies or drugs by others;
	•		for those drug candidates that are the subject of a strategic alliance, delays in reaching agreement with our partner as to appropriate development strategies;
	•		an investigational review board (“IRB”) or its foreign equivalent may require changes to a protocol that then require approval from regulatory agencies and other IRBs and their foreign equivalents, or regulatory authorities may require changes to a protocol that then require approval from the IRBs or their foreign equivalents;
	•		for clinical trials conducted in foreign countries, the time and resources required to identify, interpret and comply with foreign regulatory requirements or changes in those requirements, and political instability or natural disasters occurring in those countries;
	•		lack of effectiveness of our drug candidates during clinical trials;
	•		unforeseen safety issues;
	•		inadequate supply of clinical trial materials;
	•		uncertain dosing issues;
	•		failure by us, our partners, or clinical research organizations, investigators or site personnel engaged by us or our partners to comply with good clinical practices and other applicable laws and regulations;
	•		inability or unwillingness of investigators or their staffs to follow clinical protocols;
	•		inability to monitor patients adequately during or after treatment;
	•		introduction of new therapies or changes in standards of practice or regulatory guidance that render our drug candidates or their clinical trial endpoints obsolete; and
	•		results from non-clinical studies that may adversely impact the further development of our drug candidates.

     We do not know whether planned clinical trials will begin on time, or whether planned or currently ongoing clinical trials will need to be restructured or will be completed on schedule, if at all. Significant delays in clinical trials will impede our ability to commercialize our drug candidates and generate revenue and could significantly increase our development costs.

If we fail to enter into and maintain successful strategic alliances for our drug candidates, potential drug candidates or research and development programs, we will have to reduce, delay or discontinue our advancement of those drug candidates, potential drug candidates and programs or expand our research and development capabilities and increase our expenditures.

     Drug development is complicated and expensive. We currently have limited financial and operational resources to carry out drug development. Our strategy for developing, manufacturing and commercializing our drug candidates and potential drug candidates currently requires us to enter into and successfully maintain strategic alliances with pharmaceutical companies or other industry participants to advance our programs and reduce our expenditures on each program. Accordingly, the success of our development activities depends in large part on our current and future strategic partners’ performance, over which we have little or no control.

     We have retained all rights to develop and commercialize CK-2017357, ispinesib and SB-743921. We currently do not have a strategic partner for these drug candidates. We are conducting the Phase I portion of a Phase I/II clinical trial for each of ispinesib in breast cancer and SB-743921 in Hodgkin and non-Hodgkin lymphoma. We are also conducting a Phase I clinical trial of CK-2017357 in healthy volunteers. We expect to rely on one or more strategic partners to advance and develop each of ispinesib, SB-743921, CK-2017357 and other compounds from our skeletal muscle contractility program and our potential drug candidate directed towards smooth muscle contractility. However, we may not be able to negotiate and enter into such strategic alliances on acceptable terms, if at all.

     We rely on Amgen to conduct preclinical and clinical development for omecamtiv mecarbil for the potential treatment of heart failure. If Amgen elects to terminate its development activities with respect to omecamtiv mecarbil, we currently do not have an alternative strategic partner for this drug candidate. We rely on GSK to conduct preclinical and clinical development for GSK-923295 for the potential treatment of cancer. If GSK elects to terminate its development activities with respect to GSK-923295, we currently do not have an alternative strategic partner for this drug candidate.

     Our ability to commercialize drugs that we develop with our partners and that generate royalties from product sales depends on our

partners’ abilities to assist us in establishing the safety and efficacy of our drug candidates, obtaining and maintaining regulatory approvals and achieving market acceptance of the drugs once commercialized. Our partners may elect to delay or terminate development of one or more drug candidates, independently develop drugs that could compete with ours or fail to commit sufficient resources to the marketing and distribution of drugs developed through their strategic alliances with us. Our partners may not proceed with the development and commercialization of our drug candidates with the same degree of urgency as we would because of other priorities they face.

     If we are not able to successfully maintain our existing strategic alliances or establish and successfully maintain additional strategic alliances, we will have to limit the size or scope of, or delay or discontinue, one or more of our drug development programs or research programs, or undertake and fund these programs ourselves. Alternatively, if we elect to continue to conduct any of these drug development programs or research programs on our own, we will need to expand our capability to conduct clinical development by bringing additional skills, technical expertise and resources into our organization. This would require significant additional funding, which may not be available to us on acceptable terms, or at all.

We depend on GSK for the conduct, completion and funding of the clinical development and commercialization of GSK-923295.

     Under our strategic alliance, GSK is responsible for the clinical development and obtaining and maintaining regulatory approval of our drug candidate GSK-923295 for cancer and other indications. We do not control the clinical development activities being conducted or that may be conducted in the future by GSK, including, but not limited to, the timing of initiation, termination or completion of clinical trials, the analysis of data arising out of those clinical trials or the timing of release of data concerning those clinical trials, which may impact our ability to report on GSK’s results.

     GSK may conduct these activities more slowly or in a different manner than we would if we controlled the clinical development of GSK-923295. GSK is responsible for filing applications with the FDA or other regulatory authorities for approval of GSK-923295 and will be the owner of any marketing approvals issued by the FDA or other regulatory authorities for GSK-923295. If the FDA or other regulatory authorities approve GSK-923295, GSK will also be responsible for the marketing and sale of the resulting drug, subject to our right to co-promote GSK-923295 in North America if we exercise our option to co-fund certain later-stage development activities for GSK-923295. However, we cannot control whether GSK will devote sufficient attention and resources to the clinical development of GSK-923295 or will proceed in an expeditious manner, even if we do exercise our option to co-fund the development of GSK-923295. Even if the FDA or other regulatory agencies approve GSK-923295, GSK may elect not to proceed with the commercialization of the resulting drug in one or more countries.

     GSK generally has discretion to elect whether to pursue or abandon the development of GSK-923295 and may terminate our strategic alliance for any reason upon six months prior notice. If the initial results of one or more clinical trials with GSK-923295 do not meet GSK’s expectations, GSK may elect to terminate further development of GSK-923295 or certain of the potential clinical trials for GSK-923295, even if the actual number of patients treated at that time is relatively small. If GSK abandons GSK-923295, it would result in a delay in or could prevent us from commercializing GSK-923295, and would delay and could prevent us from obtaining revenues for this drug candidate. Disputes may arise between us and GSK, which may delay or cause the termination of any GSK-923295 clinical trials, result in significant litigation or arbitration, or cause GSK to act in a manner that is not in our best interest. If development of GSK-923295 does not progress for these or any other reasons, we would not receive further milestone payments or royalties on product sales from GSK with respect to GSK-923295. If GSK abandons development of GSK-923295 prior to regulatory approval or if it elects not to proceed with commercialization of the resulting drug following regulatory approval, we would have to seek a new partner for clinical development or commercialization, curtail or abandon that clinical development or commercialization, or undertake and fund the clinical development of GSK-923295 or commercialization of the resulting drug ourselves. If we seek a new partner but are unable to do so on acceptable terms, or at all, or do not have sufficient funds to conduct the development or commercialization of GSK-923295 ourselves, we would have to curtail or abandon that development or commercialization, which could harm our business.

We depend on contract research organizations to conduct our clinical trials and have limited control over their performance.

     We utilize contract research organizations (“CROs”) for our clinical trials of omecamtiv mecarbil, CK-2017357, ispinesib and SB-743921 within and outside of the United States. We do not have operational control over many aspects of our CROs’ activities, and cannot fully control the amount, timing or quality of resources that they devote to our programs. CROs may not assign as high a priority to our programs or pursue them as diligently as we would if we were undertaking these programs ourselves. The activities conducted by our CROs therefore may not be completed on schedule or in a satisfactory manner. CROs may also give higher priority to relationships with our competitors and potential competitors than to their relationships with us. Outside of the United States, we are particularly dependent on our CROs’ expertise in communicating with clinical trial sites and regulatory authorities and ensuring that our clinical trials and related activities and regulatory filings comply with applicable local laws. Our CROs’ failure to carry out development activities on our behalf according to our and the FDA’s or other regulatory agencies’ requirements and in accordance with applicable U.S. and foreign laws, or our failure to properly coordinate and manage these activities, could increase the cost of our operations and delay or prevent the development, approval and commercialization of our drug candidates. In addition, if a CRO fails to perform as agreed, our ability to collect damages may be contractually limited. If we fail to effectively manage the CROs carrying out the development of our drug candidates or if our CROs fail to perform as agreed, the commercialization of our drug candidates will be delayed or prevented.

We have no manufacturing capacity and depend on our strategic partners and contract manufacturers to produce our clinical trial drug supplies for each of our drug candidates and potential drug candidates, and anticipate continued reliance on contract manufacturers for the development and commercialization of our potential drugs.

     We do not currently operate manufacturing facilities for clinical or commercial production of our drug candidates or potential drug candidates. We have limited experience in drug formulation and manufacturing, and we lack the resources and the capabilities to manufacture any of our drug candidates or potential drug candidates on a clinical or commercial scale. Amgen has assumed responsibility to conduct these activities for the ongoing clinical development of omecamtiv mecarbil worldwide, except Japan. We rely on GSK to conduct these activities for the ongoing clinical development of GSK-923295. For CK-2017357, ispinesib, SB-743921 and our other drug candidates and potential drug candidates, we rely (and for omecamtiv mecarbil, we have relied) on a limited number of contract manufacturers, and, in particular, we rely on single-source contract manufacturers for the active pharmaceutical ingredient and the drug product supply for our clinical trials. We expect to rely on contract manufacturers to supply all future drug candidates for which we conduct clinical development. If any of our existing or future contract manufacturers fail to perform satisfactorily, it could delay clinical development or regulatory approval of our drug candidates or commercialization of our drugs, producing additional losses and depriving us of potential product revenues. In addition, if a contract manufacturer fails to perform as agreed, our ability to collect damages may be contractually limited.

     Our drug candidates and potential drug candidates require precise high-quality manufacturing. The failure to achieve and maintain high manufacturing standards, including failure to detect or control anticipated or unanticipated manufacturing errors or the frequent occurrence of such errors, could result in patient injury or death, discontinuance or delay of ongoing or planned clinical trials, delays or failures in product testing or delivery, cost overruns, product recalls or withdrawals and other problems that could seriously hurt our business. Contract drug manufacturers often encounter difficulties involving production yields, quality control and quality assurance and shortages of qualified personnel. These manufacturers are subject to stringent regulatory requirements, including the FDA’s current good manufacturing practices regulations and similar foreign laws and standards. Each contract manufacturer must pass a pre-approval inspection before we can obtain marketing approval for any of our drug candidates and following approval will be subject to ongoing periodic unannounced inspections by the FDA, the U.S. Drug Enforcement Agency and other regulatory agencies, to ensure strict compliance with current good manufacturing practices and other applicable government regulations and corresponding foreign laws and standards. We seek to ensure that our contract manufacturers comply fully with all applicable regulations, laws and standards. However, we do not have control over our contract manufacturers’ compliance with these regulations, laws and standards. If one of our contract manufacturers fails to pass its pre-approval inspection or maintain ongoing compliance at any time, the production of our drug candidates could be interrupted, resulting in delays or discontinuance of our clinical trials, additional costs and potentially lost revenues. In addition, failure of any third party manufacturers or us to comply with applicable regulations, including pre-or post-approval inspections and the current good manufacturing practice requirements of the FDA or other comparable regulatory agencies, could result in sanctions being imposed on us. These sanctions could include fines, injunctions, civil penalties, failure of regulatory authorities to grant marketing approval of our products, delay, suspension or withdrawal of approvals, license revocation, product seizures or recalls, operational restrictions and criminal prosecutions, any of which could significantly and adversely affect our business.

     In addition, our existing and future contract manufacturers may not perform as agreed or may not remain in the contract manufacturing business for the time required to successfully produce, store and distribute our drug candidates. If a natural disaster, business failure, strike or other difficulty occurs, we may be unable to replace these contract manufacturers in a timely or cost-effective manner and the production of our drug candidates would be interrupted, resulting in delays and additional costs.

     Switching manufacturers or manufacturing sites would be difficult and time-consuming because the number of potential manufacturers is limited. In addition, before a drug from any replacement manufacturer or manufacturing site can be commercialized, the FDA and, in some cases, foreign regulatory agencies, must approve that site. These approvals would require regulatory testing and compliance inspections. A new manufacturer or manufacturing site also would have to be educated in, or develop substantially equivalent processes for, production of our drugs and drug candidates. It may be difficult or impossible to transfer certain elements of a manufacturing process to a new manufacturer or for us to find a replacement manufacturer on acceptable terms quickly, or at all, either of which would delay or prevent our ability to develop drug candidates and commercialize any resulting drugs.

We may not be able to successfully scale-up manufacturing of our drug candidates in sufficient quality and quantity, which would delay or prevent us from developing our drug candidates and commercializing resulting approved drugs, if any.

     To date, our drug candidates have been manufactured in small quantities for preclinical studies and early-stage clinical trials. In order to conduct larger scale or late-stage clinical trials for a drug candidate and for commercialization of the resulting drug if that drug candidate is approved for sale, we will need to manufacture it in larger quantities. We may not be able to successfully increase the manufacturing capacity for any of our drug candidates, whether in collaboration with third-party manufacturers or on our own, in a timely or cost-effective manner or at all. If a contract manufacturer makes improvements in the manufacturing process for our drug candidates, we may not own, or may have to share, the intellectual property rights to those improvements. Significant scale-up of manufacturing may require additional validation studies, which are costly and which the FDA must review and approve. In addition, quality issues may arise during those scale-up activities because of the inherent properties of a drug candidate itself or of a drug candidate in combination with other components added during the manufacturing and packaging process, or during shipping and storage of the finished product or active pharmaceutical ingredients. If we are unable to successfully scale-up manufacture of any of

our drug candidates in sufficient quality and quantity, the development of that drug candidate and regulatory approval or commercial launch for any resulting drugs may be delayed or there may be a shortage in supply, which could significantly harm our business.

The mechanisms of action of our drug candidates and potential drug candidates are unproven, and we do not know whether we will be able to develop any drug of commercial value.

     We have discovered and are currently developing drug candidates and potential drug candidates that have what we believe are novel mechanisms of action directed against cytoskeletal targets, and intend to continue to do so. Because no currently approved drugs appear to operate via the same biochemical mechanisms as our compounds, we cannot be certain that our drug candidates and potential drug candidates will result in commercially viable drugs that safely and effectively treat the indications for which we intend to develop them. The results we have seen for our compounds in preclinical models may not translate into similar results in humans, and results of early clinical trials in humans may not be predictive of the results of larger clinical trials that may later be conducted with our drug candidates. Even if we are successful in developing and receiving regulatory approval for a drug candidate for the treatment of a particular disease, we cannot be certain that we will also be able to develop and receive regulatory approval for that or other drug candidates for the treatment of other diseases. If we or our partners unable to successfully develop and commercialize our drug candidates, our business will be materially harmed.

Our success depends substantially upon our ability to obtain and maintain intellectual property protection relating to our drug candidates and research technologies.

     We own, or hold exclusive licenses to, a number of U.S. and foreign patents and patent applications directed to our drug candidates and research technologies. Our success depends on our ability to obtain patent protection both in the United States and in other countries for our drug candidates, their methods of manufacture and use, and our technologies. Our ability to protect our drug candidates and technologies from unauthorized or infringing use by third parties depends substantially on our ability to obtain and enforce our patents. If our issued patents and patent applications, if granted, do not adequately describe, enable or otherwise provide coverage of our technologies and drug candidates, including omecamtiv mecarbil, CK-2017357, ispinesib, SB-743921 and GSK-923295, we or our licensees would not be able to exclude others from developing or commercializing these drug candidates. Furthermore, the degree of future protection of our proprietary rights is uncertain because legal means may not adequately protect our rights or permit us to gain or keep our competitive advantage.

     Due to evolving legal standards relating to the patentability, validity and enforceability of patents covering pharmaceutical inventions and the claim scope of these patents, our ability to enforce our existing patents and to obtain and enforce patents that may issue from any pending or future patent applications is uncertain and involves complex legal, scientific and factual questions. The standards which the U.S. Patent and Trademark Office and its foreign counterparts use to grant patents are not always applied predictably or uniformly and are subject to change. To date, no consistent policy has emerged regarding the breadth of claims allowed in biotechnology and pharmaceutical patents. Thus, we cannot be sure that any patents will issue from any pending or future patent applications owned by or licensed to us. Even if patents do issue, we cannot be sure that the claims of these patents will be held valid or enforceable by a court of law, will provide us with any significant protection against competitive products, or will afford us a commercial advantage over competitive products. In particular:

	•		we or our licensors might not have been the first to make the inventions covered by each of our pending patent applications and issued patents;
	•		we or our licensors might not have been the first to file patent applications for the inventions covered by our pending patent applications and issued patents;
	•		others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our intellectual property rights;
	•		some or all of our or our licensors’ pending patent applications may not result in issued patents or the claims that issue may be narrow in scope and not provide us with competitive advantages;
	•		our and our licensors’ issued patents may not provide a basis for commercially viable drugs or therapies or may be challenged and invalidated by third parties;
	•		our or our licensors’ patent applications or patents may be subject to interference, opposition or similar administrative proceedings that may result in a reduction in their scope or their loss altogether;
	•		we may not develop additional proprietary technologies or drug candidates that are patentable; or
	•		the patents of others may prevent us or our partners from discovering, developing or commercializing our drug candidates.

     Patent protection is afforded on a country-by-country basis. Some foreign jurisdictions do not protect intellectual property rights to the same extent as in the United States. Many companies have encountered significant difficulties in protecting and defending

intellectual property rights in foreign jurisdictions. Some of our development efforts are performed in countries outside of the United States through third party contractors. We may not be able to effectively monitor and assess intellectual property developed by these contractors. We therefore may not be able to effectively protect this intellectual property and could lose potentially valuable intellectual property rights. In addition, the legal protection afforded to inventors and owners of intellectual property in countries outside of the United States may not be as protective of intellectual property rights as in the United States. Therefore, we may be unable to acquire and protect intellectual property developed by these contractors to the same extent as if these development activities were being conducted in the United States. If we encounter difficulties in protecting our intellectual property rights in foreign jurisdictions, our business prospects could be substantially harmed.

     Under our license agreement with the University of California and Stanford University, we have obtained an exclusive license to certain issued U.S. and European patents relating to certain of our research activities. Since we have not fully met certain of our obligations under this license agreement, including certain diligence obligations, this agreement may be terminated, in which case we would no longer have a license to these patents or to future patents that may issue from the pending applications. This may impair our ability to continue to practice the research methods covered by the issued patents. Alternatively, our license rights may become non-exclusive, which would allow the University of California and Stanford University to grant third parties the right to practice those patents. Our drug candidates and potential drug candidates in development are not covered by the patents subject to this license agreement.

     We rely on intellectual property assignment agreements with our corporate partners, employees, consultants, scientific advisors and other collaborators to grant us ownership of new intellectual property that is developed. These agreements may not result in the effective assignment to us of that intellectual property. As a result, our ownership of key intellectual property could be compromised.

     Changes in either the patent laws or their interpretation in the United States or other countries may diminish the value of our intellectual property or our ability to obtain patents. For example, the U.S. Congress is currently considering bills that could change U.S. law regarding, among other things, post-grant review of issued patents and the calculation of damages once patent infringement has been determined by a court of law. If enacted into law, these provisions could severely weaken patent protection in the United States.

     If one or more products resulting from our drug candidates is approved for sale by the FDA and we do not have adequate intellectual property protection for those products, competitors could duplicate them for approval and sale in the United Sates without repeating the extensive testing required of us or our partners to obtain FDA approval. Regardless of any patent protection, under current law, unless certain requirements are met an application for a generic version of a new chemical entity cannot be submitted to for five years after the FDA has approved the original product. When that period expires, or if it is altered, the FDA could approve a generic version of our product regardless of our patent protection. An applicant for a generic version of our product may only be required to conduct a relatively inexpensive study to show that its product is bioequivalent to our product, and may not have to repeat the lengthy and expensive clinical trials that we or our partners conducted to demonstrate that the product is safe and effective. In the absence of adequate patent protection for our products in other countries, competitors may similarly be able to obtain regulatory approval in those countries of generic versions of products our products.

     We also rely on trade secrets to protect our technology, particularly where we believe patent protection is not appropriate or obtainable. However, trade secrets are often difficult to protect, especially outside of the United States. While we endeavor to use reasonable efforts to protect our trade secrets, our or our partners’ employees, consultants, contractors or scientific and other advisors may unintentionally or willfully disclose our information to competitors. In addition, confidentiality agreements, if any, executed by those individuals may not be enforceable or provide meaningful protection for our trade secrets or other proprietary information in the event of unauthorized use or disclosure. Pursuing a claim that a third party had illegally obtained and was using our trade secrets would be expensive and time-consuming, and the outcome would be unpredictable. Even if we are able to maintain our trade secrets as confidential, if our competitors independently develop information equivalent or similar to our trade secrets, our business could be harmed.

     If we are not able to defend the patent or trade secret protection position of our technologies and drug candidates, then we will not be able to exclude competitors from developing or marketing competing drugs, and we may not generate enough revenue from product sales to justify the cost of development of our drugs or to achieve or maintain profitability.

If we are sued for infringing third party intellectual property rights, it will be costly and time-consuming, and an unfavorable outcome would have a significant adverse effect on our business.

     Our ability to commercialize drugs depends on our ability to use, manufacture and sell those drugs without infringing the patents or other proprietary rights of third parties. Numerous U.S. and foreign issued patents and pending patent applications owned by third parties exist in the therapeutic areas in which we are developing drug candidates and seeking new potential drug candidates. In addition, because patent applications can take several years to issue, there may be currently pending applications, unknown to us, which could later result in issued patents that our activities with our drug candidates could infringe. There may also be existing patents, unknown to us, that our activities with our drug candidates could infringe.

     Currently, we are aware of an issued U.S. patent and at least one pending U.S. patent application assigned to Curis, Inc., relating to certain compounds in the quinazolinone class. Ispinesib falls into this class of compounds. The Curis U.S. patent claims a method of

use for inhibiting signaling by what is called the hedgehog pathway using certain quinazolinone compounds. Curis also has pending applications in Europe, Japan, Australia and Canada with claims covering certain quinazolinone compounds, compositions thereof and/or methods of their use. Two of the Australian applications have been allowed and two of the European applications have been granted. We have opposed the granting of certain of these patents to Curis in Europe and in Australia. Curis has withdrawn one of the Australian applications. One of the European patents that we opposed was recently revoked and is no longer valid in Europe. Curis has appealed this decision.

     Curis or a third party may assert that the manufacture, use, importation or sale of ispinesib may infringe one or more of these patents. We believe that we have valid defenses against the issued U.S. patent owned by Curis if it were to be asserted against us. However, we cannot guarantee that a court would find these defenses valid or that any additional oppositions would be successful. We have not attempted to obtain a license to these patents. If we decide to seek a license to these patents, we cannot guarantee that such a license would be available on acceptable terms, if at all.

     Other future products of ours may be impacted by patents of companies engaged in competitive programs with significantly greater resources (such as Bayer AG, Merck & Co., Inc., Merck GmbH, Eli Lilly and Company, Bristol-Myers Squibb Company and AstraZeneca AB). Further development of these products could be impacted by these patents and result in significant legal fees.

     If a third party claims that our actions infringe on its patents or other proprietary rights, we could face a number of issues that could seriously harm our competitive position, including, but not limited to:

	•		infringement and other intellectual property claims that, even if meritless, can be costly and time-consuming to litigate, delay the regulatory approval process and divert management’s attention from our core business operations;
	•		substantial damages for past infringement which we may have to pay if a court determines that our drugs or technologies infringe a third party’s patent or other proprietary rights;
	•		a court prohibiting us from selling or licensing our drugs or technologies unless the holder licenses the patent or other proprietary rights to us, which it is not required to do; and
	•		if a license is available from a holder, we may have to pay substantial royalties or grant cross-licenses to our patents or other proprietary rights.

     If any of these events occur, it could significantly harm our business and negatively affect our stock price.

We may become involved in disputes with our strategic partners over intellectual property ownership, and publications by our research collaborators and clinical investigators could impair our ability to obtain patent protection or protect our proprietary information, either of which would have a significant impact on our business.

     Inventions discovered under our strategic alliance agreements may become jointly owned by our strategic partners and us in some cases, and the exclusive property of one of us in other cases. Under some circumstances, it may be difficult to determine who owns a particular invention or whether it is jointly owned, and disputes could arise regarding ownership or use of those inventions. These disputes could be costly and time-consuming, and an unfavorable outcome could have a significant adverse effect on our business if we were not able to protect or license rights to these inventions. In addition, our research collaborators and clinical investigators generally have contractual rights to publish data arising from their work. Publications by our research collaborators and clinical investigators relating to our research and development programs, either with or without our consent, could benefit our current or potential competitors and may impair our ability to obtain patent protection or protect our proprietary information, which could significantly harm our business.

We may be subject to claims that we or our employees have wrongfully used or disclosed trade secrets of their former employers.

     Many of our employees were previously employed at universities or other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although no claims against us are currently pending, we may be subject to claims that these employees or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers. Litigation may be necessary to defend against these claims. If we fail in defending these claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. A loss of key research personnel or their work product could hamper or prevent our ability to commercialize certain potential drugs, which could significantly harm our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and distract management.

Our competitors may develop drugs that are less expensive, safer or more effective than ours, which may diminish or eliminate the commercial success of any drugs that we may commercialize.

     We compete with companies that have developed drugs or are developing drug candidates for cardiovascular diseases, cancer and other diseases for which our drug candidates may be useful treatments. For example, if omecamtiv mecarbil is approved for marketing by the FDA for heart failure, that drug candidate would compete against other drugs used for the treatment of heart failure. These include generic drugs, such as milrinone, dobutamine or digoxin and newer marketed drugs such as nesiritide. Omecamtiv mecarbil could also potentially compete against other novel drug candidates in development, such as istaroxamine, which is being developed by

Debiopharm Group; bucindolol, which is being developed by ARCA biopharma, Inc.; tonapofylline, which is being developed by Biogen Idec Inc.; relaxin, which is being developed by Cothera Inc.; and CD-NP, which is being developed by Nile Therapeutics, Inc. In addition, there are a number of medical devices being developed for the potential treatment of heart failure.

     Similarly, if approved for marketing by the FDA, depending on the approved clinical indication, our anti-cancer drug candidates ispinesib, SB-743921 and GSK-923295 would compete against existing cancer treatments such as paclitaxel (and its generic equivalents), docetaxel, vincristine, vinorelbine, navelbine, ixabepilone and potentially against other novel anti-cancer drug candidates that are currently in development. These include compounds that are reformulated taxanes, other tubulin binding compounds or epothilones. We are also aware that Merck & Co., Inc., Eli Lilly and Company, Bristol-Myers Squibb Company, AstraZeneca AB, Array Biopharma Inc., ArQule, Inc., Anylam, Inc. and others are conducting research and development focused on KSP and other mitotic kinesins. In addition, Bristol-Myers Squibb Company, Merck & Co., Inc., Novartis, Genentech, Hoffman-La Roche Ltd., Eisai, Inc., Seattle Genetics, Inc. and other pharmaceutical and biopharmaceutical companies are developing other approaches to treating cancer.

     With respect to CK-2017357 and other compounds that may arise from our skeletal muscle contractility program, we are aware that GTx, Inc. and Merck & Co. are collaborating to conduct clinical trials with ostarine, a selective androgen receptor modulator, for a variety of potential indications, including sarcopenia, cancer cachexia and other musculoskeletal wasting or muscle loss conditions. Acceleron Pharma, Inc. is conducting clinical trials with ACE-031 to evaluate its ability to treat diseases involving the loss of muscle mass, strength and function.

     Our competitors may:

	•		develop drug candidates and market drugs that are less expensive or more effective than our future drugs;
	•		commercialize competing drugs before we or our partners can launch any drugs developed from our drug candidates;
	•		hold or obtain proprietary rights that could prevent us from commercializing our products;
	•		initiate or withstand substantial price competition more successfully than we can;
	•		more successfully recruit skilled scientific workers and management from the limited pool of available talent;
	•		more effectively negotiate third-party licenses and strategic alliances;
	•		take advantage of acquisition or other opportunities more readily than we can;
	•		develop drug candidates and market drugs that increase the levels of safety or efficacy that our drug candidates will need to show in order to obtain regulatory approval; or
	•		introduce therapies or market drugs that render the market opportunity for our potential drugs obsolete.

     We will compete for market share against large pharmaceutical and biotechnology companies and smaller companies that are collaborating with larger pharmaceutical companies, new companies, academic institutions, government agencies and other public and private research organizations. Many of these competitors, either alone or together with their partners, may develop new drug candidates that will compete with ours. These competitors may, and in certain cases do, operate larger research and development programs or have substantially greater financial resources than we do. Our competitors may also have significantly greater experience in:

	•		developing drug candidates;
	•		undertaking preclinical testing and clinical trials;
	•		building relationships with key customers and opinion-leading physicians;
	•		obtaining and maintaining FDA and other regulatory approvals of drug candidates;
	•		formulating and manufacturing drugs; and
	•		launching, marketing and selling drugs.

     If our competitors market drugs that are less expensive, safer or more efficacious than our potential drugs, or that reach the market sooner than our potential drugs, we may not achieve commercial success. In addition, the life sciences industry is characterized by rapid technological change. If we fail to stay at the forefront of technological change, we may be unable to compete effectively. Our competitors may render our technologies obsolete by improving existing technological approaches or developing new or different approaches, potentially eliminating the advantages in our drug discovery process that we believe we derive from our research approach and proprietary technologies.

We may expand our development and clinical research capabilities and, as a result, we may encounter difficulties in managing our growth, which could disrupt our operations.

     We may have growth in our expenditures, the number of our employees and the scope of our operations, in particular with respect to those drug candidates that we elect to develop or commercialize independently or together with a partner. To manage our anticipated future growth, we must continue to implement and improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified personnel. Due to our limited resources, we may not be able to effectively manage the expansion of our operations or recruit and train additional qualified personnel. The physical expansion of our operations may lead to significant costs and may divert our management and business development resources. Any inability to manage growth could delay the execution of our business plans or disrupt our operations.

We currently have no sales or marketing staff and, if we are unable to enter into or maintain strategic alliances with marketing partners or to develop our own sales and marketing capabilities, we may not be successful in commercializing our potential drugs.

     We currently have no sales, marketing or distribution capabilities. We plan to commercialize drugs that can be effectively marketed and sold in concentrated markets that do not require a large sales force to be competitive. To achieve this goal, we will need to establish our own specialized sales force and marketing organization with technical expertise and supporting distribution capabilities. Developing such an organization is expensive and time-consuming and could delay a product launch. In addition, we may not be able to develop this capacity efficiently, cost-effectively or at all, which could make us unable to commercialize our drugs. If we determine not to market on our drugs on our own, we will depend on strategic alliances with third parties, such as Amgen and GSK, which have established distribution systems and direct sales forces to commercialize them. If we are unable to enter into such arrangements on acceptable terms, we may not be able to successfully commercialize these drugs. To the extent that we are not successful in commercializing any drugs ourselves or through a strategic alliance, our product revenues and business will suffer and our stock price would decrease.

Our failure to attract and retain skilled personnel could impair our drug development and commercialization activities.

     Our business depends on the performance of our senior management and key scientific and technical personnel. The loss of the services of any member of our senior management or key scientific or technical staff may significantly delay or prevent the achievement of drug development and other business objectives by diverting management’s attention to transition matters and identifying suitable replacements. We also rely on consultants and advisors to assist us in formulating our research and development strategy. All of our consultants and advisors are either self-employed or employed by other organizations, and they may have conflicts of interest or other commitments, such as consulting or advisory contracts with other organizations, that may affect their ability to contribute to us. In addition, if and as our business grows, we will need to recruit additional executive management and scientific and technical personnel. There is currently intense competition for skilled executives and employees with relevant scientific and technical expertise, and this competition is likely to continue. Our inability to attract and retain sufficient scientific, technical and managerial personnel could limit or delay our product development activities, which would adversely affect the development of our drug candidates and commercialization of our potential drugs and growth of our business.

Our workforce reductions in September 2008 and any future workforce and expense reductions may have an adverse impact on our internal programs and our ability to hire and retain skilled personnel.

     In September 2008, we reduced our workforce by approximately 29% in order to reduce expenses and to focus on research activities in our muscle contractility programs and advancing drug candidates in our clinical pipeline. These headcount reductions and the cost control measures we have implemented may negatively affect our productivity and limit our research and development activities. For example, as part of this strategic restructuring, we have discontinued our early research activities in oncology. Our future success will depend in large part upon our ability to attract and retain highly skilled personnel. We may have difficulty retaining and attracting such personnel as a result of a perceived risk of future workforce reductions. In light of our continued need for funding and cost control, we may be required to implement future workforce and expense reductions, which could further limit our research and development activities. In addition, the implementation of any additional workforce or expense reduction programs may divert the efforts of our management team and other key employees, which could adversely affect our business.

Risks Related To Our Industry