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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 10-Q/A

Amendment No. 1

(Mark one)

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



FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2005



OR



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



Commission File Number: 000-30347



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CURIS, INC.

(Exact Name of Registrant as Specified in Its Charter)



|                                                               |  |                                     
|-------------------------------------------------------------- |  | ------------------------------------
|Delaware                                                       |  | 04-3505116                          
|(State or Other Jurisdiction of Incorporation or Organization) |  | (I.R.S. Employer Identification No.)
|                                                               | 
|61 Moulton Street Cambridge, Massachusetts                     |  | 02138                               
|(Address of Principal Executive Offices)                       |  | (Zip Code)                          



Registrants
Telephone Number, Including Area Code: (617) 503-6500



---



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.    x  Yes ̈No



Indicate by check mark whether the Registrant is a large accelerated filer,
an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act.



|                         |  |                        |  |                       
|------------------------ |  | ---------------------- |  | ----------------------
|Large accelerated filer ̈ |  | Accelerated filer    x |  | Non-accelerated filer ̈



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



As of April 27, 2005, there were 47,900,726 shares of the Registrants common stock outstanding.



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EXPLANATORY NOTE:



This Amendment No. 1 on Form 10-Q/A is being filed to restate the March 31, 2005 and December 31, 2004 consolidated balance sheets contained herein to
correct amounts reported in prepaid expenses and other current assets, deposits and other assets, accrued liabilities, short-term and long-term deferred revenues, additional paid-in capital, and accumulated deficit; and to restate the consolidated
statements of operations for the three-month periods ended March 31, 2005 and March 31, 2004, to correct amounts reported in gross revenues and research and development expenses. As a result of these restatements, amounts in the consolidated
statements of cash flows for the three-month periods ended March 31, 2005 and 2004 have also been corrected.



A summary of the effects of this restatement to our financial statements included within this Amendment No. 1 on Form 10-Q/A is presented at Note 3,
Restatement of Financial Statements.



This
Amendment No. 1 amends Part I, Items 1 and 2 and Part II, Item 6 of the Quarterly Report on Form 10-Q for the quarter ended March 31, 2005. This Amendment No. 1 continues to reflect circumstances as of the date of the original filing of the
Quarterly Report on Form 10-Q for the quarter ended March 31, 2005 and we have not updated the disclosures contained herein to reflect events that occurred at a later date, except for items related to the restatement or where otherwise indicated.



We do not anticipate filing amended Annual Reports on Form
10-K or Quarterly Reports on Form 10-Q for any periods prior to the first quarter of 2005. Our Annual Reports on Form 10-K and our Quarterly Reports on Form 10-Q from the second quarter of 2003 through fiscal 2004 have not been revised to reflect
the restatement and the financial statements contained in those reports should not be relied upon. Instead, the consolidated financial statements for fiscal 2004 and 2003 included in our Annual Report on Form 10-K for the fiscal period ended
December 31, 2005 should be relied upon.



2



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##### Table of Contents

CURIS, INC. AND SUBSIDIARY

QUARTERLY REPORT ON FORM 10-Q



INDEX



|               |  |                                                                                                                                             |  |            
|-------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------- |  | -----------
|PART I.        |  | FINANCIAL INFORMATION                                                                                                                       |  | Page Number
|               |  |                                                                                                                                            
|Item 1.        |  | Financial Statements                                                                                                                        |  |            
|               |  |                                                                                                                                            
|               |  | Condensed Consolidated Balance Sheets as of March 31, 2005 and December 31, 2004 (unaudited and as restated)                                |  | 4          
|               |  |                                                                                                                                            
|               |  | Consolidated Statements of Operations and Comprehensive Loss for the Three Months ended March 31, 2005 and 2004 (unaudited and as restated) |  | 5          
|               |  |                                                                                                                                            
|               |  | Consolidated Statements of Cash Flows for the Three Months ended March 31, 2005 and 2004 (unaudited and as restated)                        |  | 6          
|               |  |                                                                                                                                            
|               |  | Notes to Unaudited Condensed Consolidated Financial Statements                                                                              |  | 7          
|               |  |                                                                                                                                            
|Item 2.        |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                                       |  | 19         
|               |  |                                                                                                                                            
|PART II.       |  | OTHER INFORMATION                                                                                                                           |  |            
|               |  |                                                                                                                                            
|Item 6.        |  | Exhibits                                                                                                                                    |  | 46         
|               | 
|SIGNATURE      |  | 47                                                                                                                                         
|               | 
|CERTIFICATIONS |  |                                                                                                                                            



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##### Table of Contents

PART IFINANCIAL INFORMATION



Item 1.    FINANCIAL STATEMENTS



CURIS, INC. AND SUBSIDIARY

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)



|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | -------------- | ------------ | - | ---------------- | - | ------------ | -
|                                                                                                                                                                                                                                                                                              |  | March 31, 2005 |              |   | December 31,2004 |  
|                                                                                                                                                                                                                                                                                              |  | (as restated)  |              |   | (as restated)    |  
|ASSETS                                                                                                                                                                                                                                                                                        |  |                |              |   |                  |   |              |  
|Current Assets:                                                                                                                                                                                                                                                                               |  |                |              |   |                  |   |              |  
|Cash and cash equivalents                                                                                                                                                                                                                                                                     |  | $              | 17,530,187   |   |                  | $ | 22,679,924   |  
|Marketable securities                                                                                                                                                                                                                                                                         |  |                | 28,365,465   |   |                  |   | 26,834,038   |  
|Accounts receivable                                                                                                                                                                                                                                                                           |  |                | 2,089,904    |   |                  |   | 1,226,460    |  
|Prepaid expenses and other current assets                                                                                                                                                                                                                                                     |  |                | 753,794      |   |                  |   | 796,618      |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Total current assets                                                                                                                                                                                                                                                                          |  |                | 48,739,350   |   |                  |   | 51,537,040   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Property and Equipment, net                                                                                                                                                                                                                                                                   |  |                | 4,165,719    |   |                  |   | 3,416,620    |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Other Assets:                                                                                                                                                                                                                                                                                 |  |                |              |   |                  |   |              |  
|Long-term investments                                                                                                                                                                                                                                                                         |  |                | 1,048,348    |   |                  |   | 2,606,681    |  
|Long-term investmentsrestricted                                                                                                                                                                                                                                                              |  |                | 193,166      |   |                  |   | 193,166      |  
|Goodwill, net                                                                                                                                                                                                                                                                                 |  |                | 8,982,000    |   |                  |   | 8,982,000    |  
|Other intangible assets, net                                                                                                                                                                                                                                                                  |  |                | 83,353       |   |                  |   | 102,122      |  
|Deposits and other assets                                                                                                                                                                                                                                                                     |  |                | 488,164      |   |                  |   | 494,413      |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Total other assets                                                                                                                                                                                                                                                                            |  |                | 10,795,031   |   |                  |   | 12,378,382   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|                                                                                                                                                                                                                                                                                              |  | $              | 63,700,100   |   |                  | $ | 67,332,042   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                                                                                                                                                                                                          |  |                |              |   |                  |   |              |  
|Current Liabilities:                                                                                                                                                                                                                                                                          |  |                |              |   |                  |   |              |  
|Debt obligations, current portion                                                                                                                                                                                                                                                             |  | $              | 751,595      |   |                  | $ | 1,141,294    |  
|Accounts payable                                                                                                                                                                                                                                                                              |  |                | 1,234,627    |   |                  |   | 1,643,219    |  
|Accrued liabilities                                                                                                                                                                                                                                                                           |  |                | 2,147,867    |   |                  |   | 1,078,687    |  
|Deferred revenue, current portion                                                                                                                                                                                                                                                             |  |                | 694,308      |   |                  |   | 819,640      |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Total current liabilities                                                                                                                                                                                                                                                                     |  |                | 4,828,397    |   |                  |   | 4,682,840    |  
|Long-term debt obligations, net of current portion                                                                                                                                                                                                                                            |  |                | 1,500,000    |   |                  |   |             |  
|Convertible notes payable                                                                                                                                                                                                                                                                     |  |                | 2,460,325    |   |                  |   | 5,710,007    |  
|Deferred revenue, net of current portion                                                                                                                                                                                                                                                      |  |                | 8,288,033    |   |                  |   | 8,356,134    |  
|Other long-term liabilities                                                                                                                                                                                                                                                                   |  |                | 380,993      |   |                  |   | 271,058      |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Total liabilities                                                                                                                                                                                                                                                                             |  |                | 17,457,748   |   |                  |   | 19,020,039   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Commitments                                                                                                                                                                                                                                                                                   |  |                |              |   |                  |   |              |  
|Stockholders Equity:                                                                                                                                                                                                                                                                         |  |                |              |   |                  |   |              |  
|Common stock, $0.01 par value125,000,000 shares authorized at March 31, 2005 and December 31, 2004; 48,930,583 and 47,882,876 shares
issued and outstanding, respectively, at March 31, 2005 and 48,565,120 and 47,517,413 shares issued and outstanding, respectively, at December 31, 2004 |  |                | 489,306      |   |                  |   | 485,652      |  
|Additional paid-in capital                                                                                                                                                                                                                                                                    |  |                | 717,753,121  |   |                  |   | 714,831,427  |  
|Treasury stock (at cost, 1,047,707 shares at March 31, 2005 and December 31, 2004)                                                                                                                                                                                                            |  |                | (891,274     | ) |                  |   | (891,274     | )
|Deferred compensation                                                                                                                                                                                                                                                                         |  |                | (433,841     | ) |                  |   | (834,157     | )
|Accumulated deficit                                                                                                                                                                                                                                                                           |  |                | (670,580,315 | ) |                  |   | (665,199,001 | )
|Accumulated other comprehensive income                                                                                                                                                                                                                                                        |  |                | (94,645      | ) |                  |   | (80,644      | )
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|Total stockholders equity                                                                                                                                                                                                                                                                    |  |                | 46,242,352   |   |                  |   | 48,312,003   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  
|                                                                                                                                                                                                                                                                                              |  | $              | 63,700,100   |   |                  | $ | 67,332,042   |  
|                                                                                                                                                                                                                                                                                              |  |                |              |   |                  |   |              |  



See accompanying notes
to unaudited condensed consolidated financial statements.



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CURIS, INC. AND SUBSIDIARY

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(unaudited)



|                                                                                                   |  |                              |            |   |               |   |            |  
|-------------------------------------------------------------------------------------------------- |  | ---------------------------- | ---------- | - | ------------- | - | ---------- | -
|                                                                                                   |  | Three Months Ended March 31, |           
|                                                                                                   |  | 2005                         |            |   | 2004          |  
|                                                                                                   |  | (as restated)                |            |   | (as restated) |  
|REVENUES:                                                                                          |  |                              |            |   |               |   |            |  
|Gross Revenues                                                                                     |  | $                            | 2,491,754  |   |               | $ | 541,593    |  
|Contra-revenues                                                                                    |  |                              | (3,304,502 | ) |               |   |           |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Net Revenues                                                                                       |  |                              | (812,748   | ) |               |   | 541,593    |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|COSTS AND EXPENSES:                                                                                |  |                              |            |   |               |   |            |  
|Research and development                                                                           |  |                              | 3,104,544  |   |               |   | 2,797,147  |  
|General and administrative                                                                         |  |                              | 1,697,864  |   |               |   | 1,915,149  |  
|Stock-based compensation(A)                                                                        |  |                              | (49,733    | ) |               |   | 301,701    |  
|Amortization of intangible assets                                                                  |  |                              | 18,768     |   |               |   | 18,768     |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Total costs and expenses                                                                           |  |                              | 4,771,443  |   |               |   | 5,032,765  |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Loss from operations                                                                               |  |                              | (5,584,191 | ) |               |   | (4,491,172 | )
|                                                                                                   |  |                              |            |   |               |   |            |  
|OTHER INCOME (EXPENSE):                                                                            |  |                              |            |   |               |   |            |  
|Interest income                                                                                    |  |                              | 259,460    |   |               |   | 107,331    |  
|Other income                                                                                       |  |                              | 24,958     |   |               |   | 153,845    |  
|Interest expense                                                                                   |  |                              | (81,541    | ) |               |   | (111,347   | )
|                                                                                                   |  |                              |            |   |               |   |            |  
|Total other income                                                                                 |  |                              | 202,877    |   |               |   | 149,829    |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Net loss                                                                                           |  | $                            | (5,381,314 | ) |               | $ | (4,341,343 | )
|                                                                                                   |  |                              |            |   |               |   |            |  
|Net loss per common share (basic and diluted)                                                      |  | $                            | (0.11      | ) |               | $ | (0.11      | )
|                                                                                                   |  |                              |            |   |               |   |            |  
|Weighted average common shares (basic and diluted)                                                 |  |                              | 47,846,903 |   |               |   | 41,105,756 |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Net loss                                                                                           |  | $                            | (5,381,314 | ) |               | $ | (4,341,343 | )
|Unrealized (loss) gain on marketable securities                                                    |  |                              | (14,001    | ) |               |   | 6,228      |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Comprehensive loss                                                                                 |  | $                            | (5,395,315 | ) |               | $ | (4,335,115 | )
|                                                                                                   |  |                              |            |   |               |   |            |  
|(A)   The following summarizes the departmental allocation of the stock-based compensation charge: |  |                              |            |   |               |   |            |  
|Research and development                                                                           |  | $                            | (51,521    | ) |               | $ | 211,114    |  
|General and administrative                                                                         |  |                              | 1,788      |   |               |   | 90,587     |  
|                                                                                                   |  |                              |            |   |               |   |            |  
|Total stock-based compensation                                                                     |  | $                            | (49,733    | ) |               | $ | 301,701    |  
|                                                                                                   |  |                              |            |   |               |   |            |  



See accompanying notes
to unaudited condensed consolidated financial statements.



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CURIS, INC. AND SUBSIDIARY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)



|                                                                                                                      |  |                              |            |   |               |   |            |  
|--------------------------------------------------------------------------------------------------------------------- |  | ---------------------------- | ---------- | - | ------------- | - | ---------- | -
|                                                                                                                      |  | Three Months Ended March 31, |           
|                                                                                                                      |  | 2005                         |            |   | 2004          |  
|                                                                                                                      |  | (as restated)                |            |   | (as restated) |  
|CASH FLOWS FROM OPERATING ACTIVITIES:                                                                                 |  |                              |            |   |               |   |            |  
|Net loss                                                                                                              |  | $                            | (5,381,314 | ) |               | $ | (4,341,343 | )
|                                                                                                                      |  |                              |            |   |               |   |            |  
|Adjustments to reconcile net loss to net cash used in operating activities-                                           |  |                              |            |   |               |   |            |  
|Depreciation and amortization                                                                                         |  |                              | 196,817    |   |               |   | 301,935    |  
|Stock-based compensation expense                                                                                      |  |                              | (49,733    | ) |               |   | 301,701    |  
|Non-cash interest expense on notes payable                                                                            |  |                              | 55,844     |   |               |   | 103,518    |  
|Amortization of intangible assets                                                                                     |  |                              | 18,768     |   |               |   | 18,768     |  
|Changes in operating assets and liabilities:                                                                          |  |                              |            |   |               |   |            |  
|Accounts receivable                                                                                                   |  |                              | (863,444   | ) |               |   | (152,242   | )
|Prepaid expenses and other assets                                                                                     |  |                              | 49,074     |   |               |   | 180,552    |  
|Accounts payable and accrued liabilities                                                                              |  |                              | 770,523    |   |               |   | 644,863    |  
|Deferred revenue                                                                                                      |  |                              | (193,433   | ) |               |   | 1,323,835  |  
|                                                                                                                      |  |                              |            |   |               |   |            |  
|Total adjustments                                                                                                     |  |                              | (15,584    | ) |               |   | 2,722,930  |  
|                                                                                                                      |  |                              |            |   |               |   |            |  
|Net cash used in operating activities                                                                                 |  |                              | (5,396,898 | ) |               |   | (1,618,413 | )
|                                                                                                                      |  |                              |            |   |               |   |            |  
|CASH FLOWS FROM INVESTING ACTIVITIES:                                                                                 |  |                              |            |   |               |   |            |  
|Purchase of marketable securities                                                                                     |  |                              | (7,916,071 | ) |               |   | (8,580,091 | )
|Sale of marketable securities                                                                                         |  |                              | 6,370,642  |   |               |   | 2,145,929  |  
|Purchase of long-term investments                                                                                     |  |                              |           |   |               |   | (3,249,395 | )
|Sale of long-term investments                                                                                         |  |                              | 1,558,333  |   |               |   | 1,027,208  |  
|Purchases of property and equipment                                                                                   |  |                              | (945,916   | ) |               |   | (84,985    | )
|                                                                                                                      |  |                              |            |   |               |   |            |  
|Net cash used in investing activities                                                                                 |  |                              | (933,012   | ) |               |   | (8,741,334 | )
|                                                                                                                      |  |                              |            |   |               |   |            |  
|CASH FLOWS FROM FINANCING ACTIVITIES:                                                                                 |  |                              |            |   |               |   |            |  
|Proceeds from issuance of common stock                                                                                |  |                              | 69,872     |   |               |   | 2,654,101  |  
|Proceeds from line of credit                                                                                          |  |                              | 1,110,301  |   |               |   |           |  
|Repayments of obligations under capital leases                                                                        |  |                              |           |   |               |   | (319,967   | )
|                                                                                                                      |  |                              |            |   |               |   |            |  
|Net cash provided by financing activities                                                                             |  |                              | 1,180,173  |   |               |   | 2,334,134  |  
|                                                                                                                      |  |                              |            |   |               |   |            |  
|                                                                                                                      |  |                             
|NET DECREASE IN CASH AND CASH EQUIVALENTS                                                                             |  |                              | (5,149,737 | ) |               |   | (8,025,613 | )
|                                                                                                                      |  |                             
|CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                                                        |  |                              | 22,679,924 |   |               |   | 27,734,548 |  
|                                                                                                                      |  |                              |            |   |               |   |            |  
|CASH AND CASH EQUIVALENTS, END OF PERIOD                                                                              |  | $                            | 17,530,187 |   |               | $ | 19,708,935 |  
|                                                                                                                      |  |                              |            |   |               |   |            |  
|                                                                                                                      | 
|                                                                                                                      |  | Three Months Ended March 31, |           
|                                                                                                                      |  | 2005                         |            |   | 2004          |  
|SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:                                                |  |                              |            |   |               |   |            |  
|Issuance of common stock in connection with conversion of note payable to Elan Pharma International, Limited (Note 4) |  | $                            | 3,305,523  |   |               | $ |           |  
|                                                                                                                      |  |                              |            |   |               |   |            |  





See accompanying notes to unaudited condensed consolidated financial statements.



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##### Table of Contents

CURIS, INC. AND SUBSIDIARY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)



|1. | Nature of Business
|-- | ------------------



Curis, Inc. (the Company or Curis) is a therapeutic drug development company principally focused on the discovery,
development and future commercialization of products that modulate key regulatory signaling pathways controlling the repair and regeneration of human tissues and organs. The Companys product development approach involves using small molecules,
proteins or antibodies to modulate these regulatory signaling pathways. The Companys lead product, a topical therapy for the treatment of basal cell carcinoma, is being co-developed with Genentech, Inc., or Genentech, a collaborator. The
Company is sharing equally in all U.S. development costs and will share equally in any future U.S. net profits and/or losses, should its basal cell carcinoma product candidate be successfully developed and marketed. The Company operates in a single
reportable segment: developmental biology products. The Company expects that any successful products would be used in the health care industry and would be regulated in the United States by the U.S. Food and Drug Administration and in overseas
market by similar regulatory agencies.



The
Company is subject to risks common to companies in the biotechnology industry including, but not limited to, development by its competitors of new technological innovations, dependence on key personnel, its ability to protect proprietary technology,
reliance on corporate collaborators to successfully research, develop and commercialize products based on the Companys technologies, its ability to comply with FDA government regulations and approval requirements as well as its ability to grow
its business and obtain adequate financing to fund this growth.



|2. | Basis of Presentation
|-- | ---------------------



The accompanying consolidated financial statements of the Company have been prepared in accordance with the instructions to Form 10-Q and
Article 10 of Regulation S-X. These statements, however, are condensed and do not include all disclosures required by accounting principles generally accepted in the U.S. for complete financial statements and should be read in conjunction with the
Companys Annual Report on Form 10-K for the year ended December 31, 2004, as filed with the Securities and Exchange Commission on March 15, 2005.



In the opinion of the Company, the unaudited financial statements contain all adjustments (all of which were considered normal and
recurring) necessary to present fairly the Companys financial position at March 31, 2005 and the results of operations and cash flows for the three-month periods ended March 31, 2005 and 2004. The preparation of the Companys consolidated
financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts and disclosure of certain assets and liabilities at the balance sheet
date. Such estimates include the carrying value of property and equipment and intangible assets and the value of certain liabilities. Actual results may differ from such estimates.



These interim results are not necessarily indicative of results to be expected for a full year or subsequent
interim periods.



|3. | Restatement of Financial Statements
|-- | -----------------------------------



The Company has restated its March 31, 2005 and December 31, 2004 consolidated balance sheets to correct amounts in prepaid
expenses and other current assets, deposits and other assets, accrued liabilities, short- and long-term deferred revenues, additional paid-in capital, and accumulated deficit. The Company has also restated its consolidated statements of operations
for the three-month periods ended March 31, 2005 and March 31, 2004, to correct amounts in gross revenues and research and development expenses. As a result of these restatements, amounts in the consolidated statements of cash flows for
the three-month periods ended March 31, 2005 and 2004 have also been corrected.



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##### Table of Contents

CURIS, INC. AND SUBSIDIARY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)(continued)



The adjustments are more fully described as follows:



| |  |  | Genentech license fee payments:The Company had been recognizing revenue in connection with $7,509,000 in license maintenance fee payments received from Genentech as of part
of the June 2003 Hedgehog antagonist collaboration between the parties over an eight-year period based on the Companys belief that its participation on the steering committees would become inconsequential after the first product was approved
in each of the two programs covered under this collaboration, and would therefore no longer represent a performance obligation. The Company has determined it should not have recognized any of this revenue in 2005, 2004 and 2003. Instead, the Company
will defer the $7,509,000 in payments and recognize this amount as revenue only when the Company can reasonably estimate when its contractual steering committee obligations will cease or after it no longer has contractual steering committee
obligations under this agreement with Genentech. The contractual term of the Companys steering committee obligations extends for as long as Hedgehog antagonist products subject to this collaboration are being developed or commercialized by
either of the parties. Accordingly, the contractual term of the Companys steering committee obligations is indefinite and the Company expects that it will not record any revenue related to these payments for at least several years.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Expenses due to university licensors:The Company is restating previously reported research and development expenses associated with $410,000 in license fee payments that
were payable by the Company to university licensors in connection with the June 2003 Hedgehog antagonist collaboration with Genentech. The Company had previously capitalized this amount as Prepaid and other current assets and
Deposits and other assets in its consolidated balance sheets and amortized this amount to research and development expense as the related license fee revenue was recognized. The Company has determined that it should have instead
recognized the entire $410,000 immediately as research and development expense in June 2003.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Correction of previously identified immaterial errorsAllocation of up-front payments received from Genentech and Wyeth:In connection with the restatement, the Company
will also correct other previously identified immaterial errors which had previously been corrected through a cumulative adjustment to the financial statements in the Companys Quarterly Report on Form 10-Q for the quarter ended
September 30, 2005. The restatement will allocate the adjustment among the correct periods.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



These errors relate to the Companys sale of shares of its common stock in connection with the June 2003 Genentech and January 2004 Wyeth
collaboration agreements. In each case, the Company calculated the value of the common stock using the negotiated price (which was less than the closing market price on the agreement date). Because of this, the Company understated additional-paid in
capital and overstated deferred revenue by $1,629,000. The overstatement of deferred revenues resulted in overstatement of license fee revenues because, in each case, the Company amortized deferred revenue over the estimated performance period to
revenues in its consolidated statements of operations. The Company will correct its accounting for these common stock sales by allocating the fair value of the common stock sold to its additional paid-in capital accounts at the date of sale and by
removing the effect of any license fee revenue that had been previously recorded as a result of these errors. The correction of the accounting for the January 2004 Wyeth collaboration agreement resulted in a $138,000 increase in net cash used in
operating activities and a corresponding increase in net cash provided by financing activities for the three months ended March 31, 2004.



The Company also corrected a $242,000 gross-up of prepaid expenses and other current assets and accrued liabilities.



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|                                              |  |                       |              |   |             |   |            |             |  |   |              |  
|--------------------------------------------- |  | --------------------- | ------------ | - | ----------- | - | ---------- | ----------- |  | - | ------------ | -
|                                              |  | As PreviouslyReported |              |   | Adjustments |   |            | As Restated | 
|Consolidated Balance Sheets                   |  |                       |              |   |             |   |            |             |  |   |              |  
|March 31, 2005                                |  |                       |              |   |             |   |            |             |  |   |              |  
|Prepaid expenses and other current assets     |  | $                     | 1,286,919    |   |             | $ | (533,125   | )           |  | $ | 753,794      |  
|Total current assets                          |  |                       | 49,272,475   |   |             |   | (533,125   | )           |  |   | 48,739,350   |  
|Total assets                                  |  |                       | 64,233,225   |   |             |   | (533,125   | )           |  |   | 63,700,100   |  
|Deferred revenue, current portion             |  |                       | 4,062,895    |   |             |   | (3,368,587 | )           |  |   | 694,308      |  
|Accrued liabilities                           |  |                       | 2,389,865    |   |             |   | (241,998   | )           |  |   | 2,147,867    |  
|Total current liabilities                     |  |                       | 8,438,982    |   |             |   | (3,610,585 | )           |  |   | 4,828,397    |  
|Deferred revenue, net of current portion      |  |                       | 4,344,909    |   |             |   | 3,943,124  |             |  |   | 8,288,033    |  
|Additional paid-in capital                    |  |                       | 716,124,121  |   |             |   | 1,629,000  |             |  |   | 717,753,121  |  
|Accumulated deficit                           |  |                       | (668,085,651 | ) |             |   | (2,494,664 | )           |  |   | (670,580,315 | )
|Total stockholders equity                    |  |                       | 47,108,016   |   |             |   | (865,664   | )           |  |   | 46,242,352   |  
|Total liabilities and stockholders equity    |  |                       | 64,233,225   |   |             |   | (533,125   | )           |  |   | 63,700,100   |  
|                                              |  |                       |             
|December 31, 2004                             |  |                       |              |   |             |   |            |             |  |   |              |  
|Prepaid expenses and other current assets     |  | $                     | 843,198      |   |             | $ | (46,580    | )           |  | $ | 796,618      |  
|Total current assets                          |  |                       | 51,583,620   |   |             |   | (46,580    | )           |  |   | 51,537,040   |  
|Deposits and other assets                     |  |                       | 750,604      |   |             |   | (256,191   | )           |  |   | 494,413      |  
|Total other assets                            |  |                       | 12,634,573   |   |             |   | (256,191   | )           |  |   | 12,378,382   |  
|Total assets                                  |  |                       | 67,634,813   |   |             |   | (302,771   | )           |  |   | 67,332,042   |  
|Deferred revenue, current portion             |  |                       | 1,939,708    |   |             |   | (1,120,068 | )           |  |   | 819,640      |  
|Total current liabilities                     |  |                       | 5,802,908    |   |             |   | (1,120,068 | )           |  |   | 4,682,840    |  
|Deferred revenue, net of current portion      |  |                       | 6,941,545    |   |             |   | 1,414,589  |             |  |   | 8,356,134    |  
|Additional paid-in capital                    |  |                       | 713,202,427  |   |             |   | 1,629,000  |             |  |   | 714,831,427  |  
|Accumulated deficit                           |  |                       | (662,972,709 | ) |             |   | (2,226,292 | )           |  |   | (665,199,001 | )
|Total stockholders equity                    |  |                       | 48,909,295   |   |             |   | (597,292   | )           |  |   | 48,312,003   |  
|Total liabilities and stockholders equity    |  |                       | 67,634,813   |   |             |   | (302,771   | )           |  |   | 67,332,042   |  
|                                              |  |                       |             
|Consolidated Statements of Operations         |  |                       |              |   |             |   |            |             |  |   |              |  
|Three-months ended March 31, 2005             |  |                       |              |   |             |   |            |             |  |   |              |  
|Gross revenues                                |  | $                     | 2,771,771    |   |             | $ | (280,017   | )           |  | $ | 2,491,754    |  
|Net revenues                                  |  |                       | (532,731     | ) |             |   | (280,017   | )           |  |   | (812,748     | )
|Research and development expenses             |  |                       | 3,116,188    |   |             |   | (11,644    | )           |  |   | 3,104,544    |  
|Total costs and expenses                      |  |                       | 4,783,087    |   |             |   | (11,644    | )           |  |   | 4,771,443    |  
|Loss from operations                          |  |                       | (5,315,818   | ) |             |   | (268,373   | )           |  |   | (5,584,191   | )
|Net loss                                      |  |                       | (5,112,941   | ) |             |   | (268,373   | )           |  |   | (5,381,314   | )
|Net loss per common share (basic and diluted) |  | $                     | (0.11        | ) |             | $ | 0.00       |             |  | $ | (0.11        | )
|                                              |  |                       |             
|Three-months ended March 31, 2004             |  |                       |              |   |             |   |            |             |  |   |              |  
|Gross revenues                                |  | $                     | 855,805      |   |             | $ | (314,212   | )           |  | $ | 541,593      |  
|Net revenues                                  |  |                       | 855,805      |   |             |   | (314,212   | )           |  |   | 541,593      |  
|Research and development expenses             |  |                       | 2,807,835    |   |             |   | (10,688    | )           |  |   | 2,797,147    |  
|Total costs and expenses                      |  |                       | 5,043,453    |   |             |   | (10,688    | )           |  |   | 5,032,765    |  
|Loss from operations                          |  |                       | (4,187,648   | ) |             |   | (303,524   | )           |  |   | (4,491,172   | )
|Net loss                                      |  |                       | (4,037,819   | ) |             |   | (303,524   | )           |  |   | (4,341,343   | )
|Net loss per common share (basic and diluted) |  | $                     | (0.10        | ) |             | $ | (0.01      | )           |  | $ | (0.11        | )



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|                                             |  |                       |            |   |             |   |          |             |  |   |            |  
|-------------------------------------------- |  | --------------------- | ---------- | - | ----------- | - | -------- | ----------- |  | - | ---------- | -
|                                             |  | As PreviouslyReported |            |   | Adjustments |   |          | As Restated | 
|Consolidated Statements of Cash Flows        |  |                       |            |   |             |   |          |             |  |   |            |  
|                                             |  |                       |           
|Three months ended March 31, 2005            |  |                       |            |   |             |   |          |             |  |   |            |  
|Net loss                                     |  | $                     | (5,112,941 | ) |             | $ | (268,373 | )           |  | $ | (5,381,314 | )
|Changes in operating assets and liabilities: |  |                       |            |   |             |   |          |             |  |   |            |  
|Prepaid expenses and other assets            |  |                       | (181,281   | ) |             |   | 230,355  |             |  |   | 49,074     |  
|Accounts payable and accrued liabilities     |  |                       | 1,012,521  |   |             |   | (241,998 | )           |  |   | 770,523    |  
|Deferred revenue                             |  |                       | (473,449   | ) |             |   | 280,016  |             |  |   | (193,433   | )
|Total adjustments                            |  |                       | (283,957   | ) |             |   | 268,373  |             |  |   | (15,584    | )
|                                             |  |                       |           
|Three months ended March 31, 2004            |  |                       |            |   |             |   |          |             |  |   |            |  
|Net loss                                     |  | $                     | (4,037,819 | ) |             | $ | (303,524 | )           |  | $ | (4,341,343 | )
|Changes in operating assets and liabilities: |  |                       |            |   |             |   |          |             |  |   |            |  
|Prepaid expenses and other assets            |  |                       | 191,241    |   |             |   | (10,689  | )           |  |   | 180,552    |  
|Deferred revenue                             |  |                       | 1,147,622  |   |             |   | 176,213  |             |  |   | 1,323,835  |  
|Total adjustments                            |  |                       | 2,557,406  |   |             |   | 165,524  |             |  |   | 2,722,930  |  
|Net cash used in operating activities        |  |                       | (1,480,413 | ) |             |   | (138,000 | )           |  |   | (1,618,413 | )
|Proceeds from issuance of common stock       |  |                       | 2,516,101  |   |             |   | 138,000  |             |  |   | 2,654,101  |  
|Net cash provided by financing activities    |  |                       | 2,196,134  |   |             |   | 138,000  |             |  |   | 2,334,134  |  



|4. | Revenue Recognition
|-- | -------------------



The Companys business strategy includes entering into collaborative license and development agreements with biotechnology and
pharmaceutical companies for the development and commercialization of the Companys product candidates. The terms of the agreements typically include non-refundable license fees, funding of research and development, payments based upon
achievement of clinical development milestones and royalties on product sales. The Company follows the provisions of the Securities and Exchange Commissions Staff Accounting Bulletin (SAB) No. 104 (SAB No. 104), Revenue
Recognition, Emerging Issues Task Force (EITF) Issue No. 00-21 (EITF 00-21), Accounting for Revenue Arrangements with Multiple Deliverables, EITF Issue No. 99-19 (EITF 99-19), Reporting Revenue Gross as a Principal Versus Net as
an Agent,and EITF Issue No. 01-9 (EITF 01-9), Accounting for Consideration Given by a Vendor to a Customer (Including a Reseller of the Vendors Products).



Non-refundable license fees are recognized as revenue when the Company has a contractual right to receive
such payment, the contract price is fixed or determinable, the collection of the resulting receivable is reasonably assured and the Company has no further performance obligations under the license agreement. Multiple element arrangements, such as
license and development arrangements are analyzed to determine whether the deliverables, which often include a license and performance obligations such as research and steering committee services can be separated or whether they must be accounted
for as a single unit of accounting in accordance with EITF 00-21. The Company recognizes up-front license payments as revenue upon delivery of the license only if the license has stand-alone value and the fair value of the undelivered performance
obligations, typically including research or steering committee services, can be determined. If the fair value of the undelivered performance obligations can be determined, such obligations would then be accounted for separately as performed. If the
license is considered to either (i) not have stand-alone value or (ii) have stand-alone value but the fair value of any of the undelivered performance obligations cannot be determined, the arrangement would then be accounted for as a
single unit of accounting and the license payments and payments for performance obligations are recognized as revenue over the estimated period of when the performance obligations are performed.



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Whenever the Company determines that an arrangement should be accounted for as a
single unit of accounting, it must determine the period over which the performance obligations will be performed and revenue will be recognized. Revenue will be recognized using either a relative performance or straight-line method. The Company
recognizes revenue using the relative performance method provided that the Company can reasonably estimate the level of effort required to complete its performance obligations under an arrangement and such performance obligations are provided on a
best-efforts basis. Direct labor hours or full-time equivalents are typically used as the measure of performance. Revenue recognized under the relative performance method would be determined by multiplying the total payments under the contract,
excluding royalties and payments contingent upon achievement of substantive milestones, by the ratio of level of effort incurred to date to estimated total level of effort required to complete the Companys performance obligations under the
arrangement. Revenue is limited to the lesser of the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the relative performance method, as of each reporting period.



If the Company cannot reasonably estimate the level of effort
required to complete its performance obligations under an arrangement, the performance obligations are provided on a best-efforts basis, and the Company can reasonably estimate when the performance obligation ceases or becomes inconsequential, then
the total payments under the arrangement, excluding royalties and payments contingent upon achievement of substantive milestones, would be recognized as revenue on a straight-line basis over the period the Company expects to complete its performance
obligations. Revenue is limited to the lesser of the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the straight-line basis, as of the period ending date.



If the Company cannot reasonably estimate when its
performance obligation either ceases or becomes inconsequential, then revenue is deferred until the Company can reasonably estimate when the performance obligation ceases or becomes inconsequential.



Significant management judgment is required in determining
the level of effort required under an arrangement and the period over which the Company is expected to complete its performance obligations under an arrangement. In addition, if the Company is involved in a steering committee as part of a multiple
element arrangement that is accounted for as a single unit of accounting, the Company assesses whether its involvement constitutes a performance obligation or a right to participate. Steering committee services that are not inconsequential or
perfunctory and that are determined to be performance obligations are combined with other research services or performance obligations required under an arrangement, if any, in determining the level of effort required in an arrangement and the
period over which the Company expects to complete its aggregate performance obligations.



Collaboration agreements may also contain substantive milestone payments. Substantive milestone payments are considered to be performance
bonuses that are recognized upon achievement of the milestone only if all of the following conditions are met:



| |  |  | the milestone payments are non-refundable;
| | - |  | ------------------------------------------



| |  |  | achievement of the milestone involves a degree of risk and was not reasonably assured at the inception of the arrangement;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | substantive effort is involved in achieving the milestone;
| | - |  | ----------------------------------------------------------



| |  |  | the amount of the milestone payment is reasonable in relation to the effort expended or the risk associated with achievement of the milestone; and,
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | a reasonable amount of time passes between the up-front license payment and the first milestone payment as well as between each subsequent milestone payment.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



Determination as to whether a
payment meets the aforementioned conditions involves managements judgment. If any of these conditions are not met, the resulting payment would not be considered a substantive milestone, and therefore the resulting payment would be considered
part of the consideration for the single unit of accounting and be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable, and in accordance with these
policies as described above. In addition, the determination that one such payment was not a substantive milestone would prevent the Company from concluding that subsequent milestone payments were substantive milestones and, as a result, any
additional milestone payments would also be considered part of the consideration for the single unit of accounting and would be recognized as revenue as such performance obligations are performed under either the relative performance or
straight-line methods, as applicable.



Reimbursement of costs is recognized as revenue provided the provisions of EITF 99-19 are met, the amounts are determinable, and collection of the related receivable is reasonably assured.



Royalty revenue is recognized upon the sale of the related
products, provided that the royalty amounts are fixed or determinable, collection of the related receivable is reasonably assured and the Company has no remaining performance obligations under the arrangement. If royalties are received when the
Company has remaining performance obligations, the royalty payments would be attributed to the services being provided under the arrangement and therefore would be recognized as such performance obligations are performed under either the relative
performance or straight line methods, as applicable, and in accordance with these policies as described above.



For revenue-generating arrangements where the Company, as a vendor, provides consideration to a licensor or collaborator, as a customer,
the Company applies the provisions of EITF 01-9. EITF 01-9 addresses the accounting for revenue arrangements where both the vendor and the customer make cash payments to each other for services and/or products. A payment to a customer is presumed to
be a reduction of the selling price unless the Company receives an identifiable benefit for the payment and the Company can reasonably estimate the fair value of the benefit received. Payments to a customer that are deemed a reduction of selling
price are recorded first as a reduction of revenue, to the extent of both cumulative revenue recorded to date and of probable future revenues, which include any unamortized deferred revenue balances, under all arrangements with such customer and
then as an expense. Payments that are not deemed to be a reduction of selling price would be recorded as an expense.



Amounts received prior to satisfying the above revenue recognition criteria are recorded as deferred revenue in the accompanying
consolidated balance sheets. Amounts not expected to be recognized during the twelve-month period ended March 31, 2006 are classified as long-term deferred revenue. As of March 31, 2005, the Company has short- and long-term deferred
revenue of $694,000 and $8,288,000, respectively, related to its collaborations.



The Company received a grant award during 2004 from the Spinal Muscular Atrophy Foundation. Revenue under this grant is being recognized
as the services are provided and when payment is reasonably assured under the terms of the grant.



|5. | Genentech Collaboration Accounting
|-- | ----------------------------------



In June 2003, the Company licensed its proprietary Hedgehog pathway technologies to Genentech for human therapeutic use. The primary focus
of the collaborative research plan has been to develop molecules that inhibit, or antagonize, the Hedgehog pathway for the treatment of various cancers. The collaboration



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consists of two programs: the development of a small molecule Hedgehog antagonist formulated for the topical treatment for basal cell carcinoma; and the
development of systemically administered small molecule and antibody Hedgehog antagonists for the treatment of certain other solid tumor cancers. Pursuant to the collaboration agreement, Genentech agreed to make specified cash payments, including
up-front payments of $8,500,000, which consisted of a $3,509,000 nonrefundable license fee payment and $4,991,000 in exchange for 1,323,835 shares of our common stock. Genentech also agreed to make license maintenance fee payments totaling
$4,000,000 over the first two years of the collaboration and substantive milestone payments at various intervals during the clinical development and regulatory approval process of small molecule and antibody Hedgehog antagonist product candidates,
assuming specified clinical development and regulatory approval objectives are met. In addition, Genentech will pay a royalty on potential future net product sales, which increases with increasing sales volume.



The Company considers its June 2003 arrangement with
Genentech to be a revenue arrangement with multiple deliverables. The Companys deliverables under this collaboration include an exclusive license to its Hedgehog antagonist technologies, research and development services for the first two
years of the collaboration, and participation on steering committees. The Company applied the provisions of EITF 00-21 to determine whether the performance obligations under this collaboration could be accounted for separately or should be accounted
for as a single unit of accounting. The Company determined that the deliverables, specifically, the license, research and development services and steering committee participation, represented a single unit of accounting because the Company believes
that the license, although delivered at the inception of the arrangement, does not have stand-alone value to Genentech without the Companys research and development services and steering committee participation and because objective and
reliable evidence of the fair value of the Companys research and development services and steering committee participation could not be determined.



The Company has attributed the $3,509,000 up-front fee and the $4,000,000 of maintenance fees to the undelivered research and development
services and steering committee participation. The Company did not consider the $4,000,000 in maintenance fees to be substantive milestone payments because receipt of the maintenance fee payments did not meet each of the criteria set forth in the
Companys revenue recognition policy related to substantive milestones (See Note 4).



The Company has deferred the $7,509,000 in license and maintenance fee payments and will recognize it only when the Company can reasonably
estimate when its contractual steering committee obligations will cease or after it no longer has contractual steering committee obligations under this agreement with Genentech. The contractual term of the Companys steering committee
obligations extends for as long as Hedgehog antagonist products subject to this collaboration are being developed or commercialized by either of the parties. Accordingly, the contractual term of the Companys steering committee obligations is
indefinite and the Company expects that it will not record any revenue related to these payments for at least several years.



The Company expects that some of the clinical development and drug approval milestones under this collaboration with Genentech will be
considered to be substantive milestones provided that the successful achievement of these milestones meets each of the criteria set forth in the Companys revenue recognition policy related to substantive milestones. For example, the Company
believes that a milestone payment for the filing of an investigational new drug application would be substantive since the requirements of its revenue recognition policy would have been met. Should the company ever successfully achieve any
substantive milestones under this collaboration agreement, any related milestone payments would be recorded as revenue upon achievement of the milestone in Substantive milestones in the Revenues section of its Consolidated Statement of
Operations.



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The Company believes that certain contingent payments tied to later stage clinical
development and drug approval objectives under this collaboration may not constitute substantive milestones since the successful achievement of these objectives would not meet each of the criteria set forth in the Companys revenue recognition
policy related to substantive milestones (i.e., the Company does not expect to incur substantive effort in achieving late-stage clinical and drug approval objectives). Accordingly, all such contingent payments will be deferred until the Company can
reasonably estimate when its contractual steering committee obligations will cease, or after it no longer has contractual steering committee obligations under this agreement with Genentech.



Under the collaboration agreement, the Company has the option
to elect to co-develop Hedgehog antagonist products in the field of basal cell carcinoma in the U.S. In January 2005, the Company elected to exercise this co-development option and will now share equally in both U.S. development costs and any future
U.S. net profits and/or losses resulting from the development and commercialization of its basal cell carcinoma product candidate. This co-development right includes basal cell carcinoma and any additional indications for which this product
candidate may be developed in the U.S. As a result of participating in co-development, the Company will forego U.S. development milestone and royalty payments on potential future U.S. sales of the basal cell carcinoma product candidate. Should the
Company determine that it cannot continue funding its equal share of the development expenses, the Company may opt out of the co-development structure and receive certain development and regulatory approval milestones and royalties on sales of the
basal cell carcinoma product candidate, should any ever occur. In addition, in certain major international markets, the Company will receive milestones if specific clinical development objectives are achieved and a royalty on any international sales
of any basal cell carcinoma product candidate.



On March 31, 2005, Genentech filed an investigational new drug application with the FDA in order to initiate human clinical investigation of the basal cell carcinoma product candidate. Assuming the acceptance of the investigational new drug
application by the FDA and the successful advancement of the basal cell carcinoma product candidate through phase I and phase II clinical trials, the Company expects that the phase II clinical trial will be completed in mid-2007. The Company expects
to incur significant costs related to the funding of its share of the development expenses through phase II clinical trials and additional costs to complete phase III clinical trials and complete the regulatory approval process, assuming that the
Company and Genentech successfully complete phase II clinical trials.



In connection with the co-development arrangement, the Company has applied the provisions of EITF Issue No. 01-9, Accounting for Consideration Given by a Vendor to a Customer (Including a Reseller of the
Vendors Products), or EITF 01-9, which addresses revenue arrangements where both parties make cash payments to each other, as is the case with the Companys collaboration agreement with Genentech. The collaboration is divided between
two development programstopical therapy for the treatment of basal cell carcinoma and the systemic treatment of other solid tumor cancers. As noted above, the topical therapy for the treatment of basal cell carcinoma product candidate is being
co-developed by Genentech and the Company and the Company reimburses Genentech for the Companys equal share of the basal cell carcinoma development costs incurred and invoiced by Genentech. Under the systemic treatment of other solid tumor
cancer program, Genentech reimburses the Company for research services that the Company performs under the collaboration, as defined in the agreement. In addition, Genentech reimburses the Company for certain of the Companys patent and other
expenses and will pay the Company development milestones and royalties, should certain development objectives and/or commercial sales occur.



The Company will follow the provision of EITF 01-09 and expects to record its future co-development payments first as a reduction of
revenue, to the extent of both cumulative revenue recorded to date and of probable future revenues, which includes any unamortized deferred revenue balances, under all arrangements with Genentech and then as an expense.



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NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)(continued)



As of March 31, 2005, the Company has recorded cumulative revenues under the
collaboration agreement with Genentech of $1,636,000. In addition, at March 31, 2005, the Companys unamortized deferred revenue under its collaboration with Genentech were $7,509,000. During the first quarter of 2005, the Company incurred
$3,305,000 in costs related to the co-development of the basal cell carcinoma therapeutic product candidate, which represents amounts owed to Genentech for the reimbursement of the Companys equal share of costs incurred by Genentech under the
agreement. The $3,305,000 in costs also represent the cumulative costs incurred to date on this program. Since the sum of cumulative revenue recorded to date and the unamortized deferred revenue exceeded cumulative co-development costs incurred
to-date, the Company has recorded a reduction to revenues, or contra-revenue, of $3,305,000 in its consolidated statement of operations and comprehensive loss for the three-month period ended March 31, 2005.



|6. | Long-Term Debt and Capital Lease Obligations
|-- | --------------------------------------------



Long-term debt and capital lease obligations consisted of the following at March 31, 2005 and December 31, 2004:



|                                                                                                                                                                                                             |  |               |           |   |                  |   |            |  
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |  | ------------- | --------- | - | ---------------- | - | ---------- | -
|                                                                                                                                                                                                             |  | March 31,2005 |           |   | December 31,2004 |  
|Notes payable to financing agencies for capital purchases                                                                                                                                                    |  | $             | 2,250,000 |   |                  | $ | 1,141,000  |  
|Convertible promissory note agreement with Elan Pharma International, Limited including approximately $298,000 and $115,000 of accrued
interest at December 31, 2004                                         |  |               |          |   |                  |   | 3,298,000  |  
|Convertible subordinated note payable to Becton Dickinson, net of $67,000 and $80,000 discount and including $527,000 and $492,000 of accrued
interest at March 31, 2005 and December 31, 2004, respectively |  |               | 2,460,000 |   |                  |   | 2,412,000  |  
|                                                                                                                                                                                                             |  |               |           |   |                  |   |            |  
|                                                                                                                                                                                                             |  |               | 4,710,000 |   |                  |   | 6,851,000  |  
|Lesscurrent portion                                                                                                                                                                                         |  |               | (750,000  | ) |                  |   | (1,141,000 | )
|                                                                                                                                                                                                             |  |               |           |   |                  |   |            |  
|Total long-term debt obligations                                                                                                                                                                             |  | $             | 3,960,000 |   |                  | $ | 5,710,000  |  
|                                                                                                                                                                                                             |  |               |           |   |                  |   |            |  



Effective January 7, 2005, the Company entered into an amendment with the Boston Private Bank & Trust Company to extend the drawdown date in which it can request periodic financings up to $2,250,000 for qualifying purchases of equipment
and leaseholds under the loan agreement through April 30, 2005. On March 23, 2005, the Company drew down the remaining balance under this agreement bringing the total amount financed to $2,250,000 and exercised its option to convert the then
outstanding balance into a 36-month term note that bears interest at a fixed rate of 7.36% for the repayment period. Under the terms of the note payable, the Company is required to make equal monthly payments of $62,500 beginning on May 1, 2005 and
extending through the 36-month term. Accordingly, the Company has classified $750,000 as a current obligation and $1,500,000 as a long-term obligation. The loan is collateralized by all of the Companys property, plant and equipment assets,
except for those that are affixed to the property and those that are purchased after March 23, 2005 under purchase money arrangements with equipment lenders. As of March 31, 2005, the Company was in compliance with the sole covenant under this
agreement to maintain a minimum working capital ratio. Should the Company fail to pay amounts when due or fail to maintain compliance with the covenant under this agreement, the entire obligation becomes immediately due at the option of the Boston
Private Bank & Trust Company.



On January
7, 2005, Elan Pharma International Limited, or EPIL, elected to convert the entire balance of its outstanding convertible note into shares of the Companys common stock. As of January 7, 2005, the outstanding balance of the EPIL note, including
interest, was $3,305,523. In accordance with the terms of the amended and restated convertible note payable with EPIL, 330,552 shares of the Companys common stock were issued to EPIL based on a conversion rate of $10.00 per share. The Company
has no further obligations to EPIL.



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CURIS, INC. AND SUBSIDIARY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)(continued)



|7. | Accounting for Stock-Based Compensation
|-- | ---------------------------------------



The Company has two stock option plans. The Company applies APB Opinion No. 25, Accounting for Stock Issued to Employees and
related interpretations, including FASB Interpretation No. 44, in accounting for qualifying options granted to its employees and directors under its plans and applies Statement of Financial Accounting Standards No. 123, Accounting for
Stock-Based Compensation, as amended by FASB No. 148, for disclosure purposes only. The SFAS 123 disclosures include pro forma net loss and net loss per share as if the fair value method of accounting had been used. Stock issued to
non-employees is accounted for in accordance with SFAS 123 and related interpretations.



The following are the pro forma net loss and net loss per share, as if compensation expense for the option plans had been determined based
on the fair value at the date of grant, consistent with SFAS 123:



|                                                                                                                |  |                              |            |   |               |   |            |  
|--------------------------------------------------------------------------------------------------------------- |  | ---------------------------- | ---------- | - | ------------- | - | ---------- | -
|                                                                                                                |  | Three months ended March 31, |           
|                                                                                                                |  | 2005                         |            |   | 2004          |  
|                                                                                                                |  | (As Restated)                |            |   | (As Restated) |  
|Net loss applicable to common stockholders, as reported                                                         |  | $                            | (5,381,000 | ) |               | $ | (4,341,000 | )
|Add back: employee stock-based compensation included in net loss applicable to common stockholders, as reported |  |                              | 2,000      |   |               |   | 209,000    |  
|Less: stock-based employee compensation expense determined under fair value based methods for all awards        |  |                              | (1,178,000 | ) |               |   | (1,952,000 | )
|                                                                                                                |  |                              |            |   |               |   |            |  
|Pro forma net loss                                                                                              |  | $                            | (6,557,000 | ) |               | $ | (6,084,000 | )
|Net loss per common share (basic and diluted)                                                                  |  |                              |            |   |               |   |            |  
|As reported                                                                                                     |  | $                            | (0.11      | ) |               | $ | (0.11      | )
|Pro forma                                                                                                       |  | $                            | (0.14      | ) |               | $ | (0.15      | )



The
effects on three months ended March 31, 2005 and 2004 pro forma net loss and net loss per share of the estimated fair value of stock options and shares are not necessarily representative of the effects on the results of operations in the future. In
addition, the estimates made utilize a pricing model developed for traded options with relatively short lives; the Companys option grants typically have a life of up to ten years and are generally not transferable. Therefore, the actual fair
value of a stock option grant may be different from these estimates. The Company believes that its estimates incorporate all relevant information and represent a reasonable approximation in light of the difficulties involved in valuing non-traded
stock options.



|8. | Subsequent Events
|-- | -----------------



| | (a) |  | Drug Discovery Collaboration Agreement with Genentech
| | --- |  | -----------------------------------------------------



| | (i) |  | Collaboration Summary
| | --- |  | ---------------------



On April 1, 2005, the Company entered into a drug discovery collaboration agreement with Genentech for the discovery and development of
small molecule compounds that modulate a signaling pathway that plays an important role in cell proliferation. This pathway is a regulator of tissue formation and repair, the abnormal activation of which is associated with certain cancers. Under the
terms of the agreement, the Company has granted Genentech an exclusive, royalty-bearing license to make, use and sell the small molecule compounds that are modulators of the pathway. Curis has retained the rights for ex vivo cell therapy, except in
the areas of oncology and hematopoiesis.



Under
the terms of the agreement, the Company will have primary responsibility for research and development activities and Genentech will be responsible for clinical development, manufacturing, and commercialization of products that may result from the
collaboration. Genentech paid the Company an up-



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CURIS, INC. AND SUBSIDIARY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)(continued)



front license fee of $3,000,000 and has agreed to fund up to $6,000,000 for research and development activities during the initial two-year research term,
subject to its termination rights described below. Genentech will also make cash payments to the Company that are contingent upon the successful achievement of certain preclinical and clinical development milestones and drug approval milestones.
Genentech has an option to extend the initial two-year research term for up to two additional years in one-year increments. Genentech will also pay the Company royalties on net product sales if product candidates derived from the collaboration are
successfully developed.



Each party has the
right to terminate the agreement for uncured material breach by the other party. Genentech has the right to terminate the agreement without cause at any time after the first anniversary of the effective date, upon six months prior written notice, if
such termination is to be effective prior to the end of the initial research term, and upon sixty days prior written notice otherwise. In the event of termination by Genentech without cause or if the agreement is terminated by Genentech due to
material breach, the Company would be entitled to receive only a reduced royalty for those products that are covered by a subset of certain intellectual property rights, in lieu of the standard contract royalties that would otherwise apply.



| | (ii) |  | Accounting Summary
| | ---- |  | ------------------



The Company considers this arrangement with Genentech to be a revenue arrangement with multiple deliverables. The Companys
deliverables under this collaboration include an exclusive license to its technologies in this signaling pathway and certain performance obligations, including research services for at least two years and participation on a steering committee. The
Company applied the provisions of EITF 00-21 to determine whether the performance obligations under this collaboration can be accounted for separately or as a single unit or multiple units of accounting. The Company determined that these
deliverables represented a single unit of accounting, since the Company believes that the license does not have stand-alone value to Genentech without the Companys research services and steering committee participation during certain phases of
research and because objective and reliable evidence of the fair value of the Companys research and steering committee participation could not be determined.



The Companys ongoing performance obligations under this collaboration consist of participation on a
steering committee and the performance of research services. Because the Company can reasonably estimate its level of effort over the term of the arrangement, the Company is accounting for the arrangement under the relative performance method. In
developing its estimate of the Companys level of effort required to complete its performance obligations, the Company estimated that Genentech would elect twice to extend the research service period and related funding, each in one-year
increments, although there can be no assurance Genentech will, in fact, make such an election. The Company estimates that it will provide an equal number of full-time equivalents for the four-year research and development service term. In developing
this estimate, the Company assumed that Genentech will maintain its initially elected number of twelve full-time equivalent researchers throughout the four-year period. The steering committee effort is also expected to be consistent over the
four-year period. The $3,000,000 up-front fee plus $12,000,000,the total amount of research funding which the Company will be entitled to for providing twelve full-time equivalents at $250,000 each over four years, is therefore being
attributed to the research services. Revenue is being recognized as the research services are provided over the four-year period through March 2009 at a rate of $312,500 per full-time equivalent. If the research period is changed or the number of
full-time equivalents requested by Genentech changes, then the Company will update its estimated level of effort and total expected payments under the arrangement.



The Company expects that some of the preclinical, clinical development and drug approval milestones under
this collaboration with Genentech to be substantive milestones provided that the successful achievement of these milestones meets each of the criteria set forth in the Companys revenue recognition



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CURIS, INC. AND SUBSIDIARY

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (unaudited)(continued)



policy related to substantive milestones. For example, the Company believes that a milestone payment for the achievement of a preclinical milestone or
Genentechs filing of an investigational new drug application would be substantive since the requirements of its revenue recognition policy would have been met. Should the company ever successfully achieve any substantive milestones under this
collaboration agreement, any related milestone payments would be recorded as revenue upon achievement of the milestone in Substantive milestones in the Revenues section of its Consolidated Statement of Operations.



The Company believes that certain contingent payments tied to
later stage clinical development and drug approval objectives under this collaboration may not constitute substantive milestones since the successful achievement of these objectives would not meet each of the criteria set forth in the Companys
revenue recognition policy related to substantive milestones (i.e., the Company does not expect to incur substantive effort in achieving late-stage clinical and drug approval objectives). Accordingly, the Company will recognize such contingent
payments as revenue ratably over the remaining performance period at the time such payment is received.



| | (b) |  | Genentech April 2005 Hedgehog Antagonist Collaboration Amendment
| | --- |  | ----------------------------------------------------------------



| | (i) |  | Agreement Summary
| | --- |  | -----------------



On April 13, 2005, the Company entered into a second amendment to the Collaborative Research, Development and License Agreement with
Genentech dated June 11, 2003. The effective date of the amendment was April 11, 2005.



Under the terms of the amendment, Genentech will provide to the Company $2,000,000 of funding to continue development of therapeutics to
treat solid tumor cancers, and the research term has been extended until December 11, 2005 (previously June 11, 2005), at which time the $2,000,000 will be paid. At Genentechs option, the research term may be extended for an
additional six-month period to June 11, 2006, upon written notice delivered to the Company by October 2005. Genentech notified the Company in October 2005 of its decision to extend the research term, and will now fund ten Curis full-time
equivalents through June 11, 2006. Genentech will pay the Company $1,250,000 in June 2006, provided that Curis has performed the required research services. Other than the change to the period of the research term and payments associated with
such research, the amendment has not changed the terms of the June 2003 agreement, which remains in full force and effect.



| | (ii) |  | Accounting Summary
| | ---- |  | ------------------



The Company considered the provisions of EITF 00-21 and determined that this agreement is a separate contract from its June 2003
agreement, and a previous amendment entered into between the Company and Genentech in December 2004, since it was not contemplated at the time of the June 2003 arrangement, was separately negotiated in order to increase the number of full-time
equivalents providing research and development services and to provide xenograft tumor samples to Genentech, and was not entered into at or near the time of the June 2003 agreement. The Companys performance obligations under this agreement are
to provide research services and xenograft tumor samples to Genentech through June 11, 2006. Since Genentech elected to exercise its option and extend the research services, the Companys performance obligations would extend for an
additional period from December 2005 through June 2006. The Company has applied the provisions of SAB No. 104 and is recognizing the research funding as revenues under this collaboration as such research services are performed. The amount
payable to the Company and, accordingly, the amount of revenue to be recognized will vary if the Company provides less than the required sixteen full-time equivalents through December 2005 or the ten full-time equivalents through June 2006.



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Item 2.    MANAGEMENTS DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS



The following discussion of our financial condition and results of operations should be read in conjunction with the condensed consolidated financial
statements and the related notes appearing elsewhere in this report.



Restatement of Financial Statements



In this
Quarterly Report on Form 10Q/A we are restating our March 31, 2005 and December 31, 2004 consolidated balance sheets contained herein to correct amounts in prepaid expenses and other current assets, deposits and other assets, accrued
liabilities, short- and long-term deferred revenues, additional paid-in capital, and accumulated deficit and to restate the consolidated statements of operations for the three-month periods ended March 31, 2005 and March 31, 2004, to
correct amounts reported in gross revenues and research and development expenses. As a result of these restatements, amounts in the consolidated statements of cash flows for the three-month periods ended March 31, 2005 and 2004 have also been
corrected. Our Annual Reports on Form 10-K and our Quarterly Reports on Form 10-Q from the second quarter of 2003 through fiscal 2004 have not been revised to reflect the restatement and the consolidated financial statements contained in those
reports should not be relied upon. Instead, the consolidated financial statements for fiscal 2004 and 2003 included in our Annual Report on Form 10-K for the fiscal period ended December 31, 2005 should be relied upon. For additional information
regarding the restatement, refer to Note 3 Restatement of our Financial Statements in the Notes to Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q/A. Managements discussion and analysis of the
financial condition and our results of operations for the three-month periods ended March 31, 2005 and 2004 have been updated to reflect these restated amounts.



Overview



We are a therapeutic drug development company principally focused on the discovery, development and future commercialization of products that modulate key
regulatory signaling pathways controlling the growth, repair and regeneration of human tissues and organs. Our product development approach involves using small molecules, proteins or antibodies to modulate these regulatory signaling pathways, for
example, to increase the pathway signals when they are insufficient or to decrease them when they are excessive or unregulated. We have successfully used our product development approach to produce multiple compounds with potential use for several
different disease indications. For example, we have developed a product candidate for the topical treatment of basal cell carcinoma, which is currently in a phase I clinical trial and under co-development with Genentech, Inc., or Genentech, a
collaborator. We have also developed several promising preclinical product candidates in various fields, including cancer, neurological disorders, hair growth regulation and cardiovascular disease. We operate in a single reportable segment:
developmental biology products. We expect that any successful products would be used in the health care industry and would be regulated in the United States by the U.S. Food and Drug Administration, or FDA, and in overseas markets by similar
regulatory agencies.



Since our inception, we have funded our
operations primarily through license fees, research and development funding from our strategic collaborators, the private and public placement of our equity securities, debt financings and the monetization of certain royalty rights. We have never
been profitable and have incurred an accumulated deficit of $670,580,000 as of March 31, 2005. We expect to incur significant operating losses for the next several years as we devote substantially all of our resources to research and
development of our product candidates. We will need to generate significant revenues to achieve profitability and do not expect to achieve profitability in the foreseeable future, if at all.



We currently have strategic collaborations with Genentech and Wyeth
Pharmaceuticals, or Wyeth, to develop therapeutics which modulate the signaling of the Hedgehog, or Hh, pathway and, as of April 1, 2005, an additional collaboration with Genentech to develop therapeutics that modulate another signaling pathway
that plays an important role in cell proliferation. We have also licensed our bone morphogenetic protein, or BMP, pathway portfolio to Ortho Biotech Products, a subsidiary of Johnson & Johnson, for systemic administration for



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all applications excluding orthopedic and dental therapeutic applications. Our strategic collaborations and license agreements generally provide for our
research, development and commercialization programs to be either a majority or wholly funded by our collaborators and provide us with the opportunity to receive additional payments if specified milestones are achieved, as well as royalty payments
upon the successful commercialization of any products based upon the collaboration. These strategic license and collaboration agreements included $18,000,000 in up-front payments, of which we received $6,629,000 from the sale of shares of our common
stock, and also include potential future clinical development and regulatory approval milestones of approximately $650,000,000 in the aggregate, assuming that all of the collaborations continue for their full terms, multiple products for multiple
indications are developed, and all milestone payments are received upon successful completion of specified research and/or development objectives and regulatory approvals. In the future, we plan to continue to seek corporate collaborators for the
further development and commercialization of some of our other technologies.



In January 2005, pursuant to the terms of our Hedgehog pathway collaboration agreement with Genentech, we exercised a co-development option pursuant to which we will share equally in all U.S. development costs and
will also share equally in any future net profits and/or losses derived from sales in the U.S. of a therapeutic product candidate for the topical treatment of basal cell carcinoma should this product be successfully developed and marketed. Genentech
has primary responsibility for clinical trial design and management and we participate on a steering committee that oversees the clinical development of the basal cell carcinoma product candidate. As a result of our election to exercise our
co-development option, we will forego U.S. development and drug approval milestones and royalty payments on potential future U.S. sales of the basal cell carcinoma product candidate. On March 31, 2005, Genentech filed an investigational new
drug application with the FDA in order to initiate human clinical investigation of the basal cell carcinoma product candidate and, in the second quarter of 2005, the first patient was enrolled in our phase I clinical trial. We expect that by
exercising this co-development and equal cost-sharing option we will incur approximately $20,000,000 in development expenses through the planned completion of phase II clinical trials. We anticipate that the phase II clinical trials will be
completed in mid-2007, assuming that the basal cell carcinoma product candidate successfully completes its phase I clinical trial. We expect to incur additional costs to complete phase III clinical trials and the remainder of the regulatory approval
process, assuming that Genentech and we successfully complete phase II clinical trials.



Financial Operations Overview



General.    Our future operating results will depend largely on the magnitude of payments from our current and potential future corporate collaborators and the progress of other product candidates currently in our
research and development pipeline. The results of our operations will vary significantly from year to year and quarter to quarter and depend on, among other factors, the timing of our entry into new collaborations, the timing of the receipt of
payments from collaborators and the cost and outcome of clinical trials. We believe that our existing capital resources at March 31, 2005 should enable us to maintain current and planned operations into mid-2007, including expected spending related
to our co-development of our lead product candidate for the treatment of basal cell carcinoma, under development with Genentech. Our ability to continue funding our planned operations beyond mid-2007 is dependent upon the success of our
collaborations, our ability to maintain or reduce our cash burn rate and our ability to raise additional funds through equity, debt or other sources of financing. A discussion of certain risks and uncertainties that could affect our liquidity,
capital requirements and ability to raise additional funds is set forth below under the heading Risk Factors that May Affect Results.



Revenue.    We do not expect to generate any revenue from the sale of products for several years, if ever. Substantially all of
our gross revenues to date has been derived from license fees, research and development payments, and other amounts that we have received from our strategic collaborators and licensees, including Genentech, Ortho Biotech Products and Wyeth as well
as royalty revenue and payments received upon monetization of such royalty rights from Stryker Corporation. We do not expect to generate any net revenue from our Hedgehog antagonist collaboration with Genentech until we obtain FDA approval to
commercialize a basal cell carcinoma product candidate, if ever, as our share of co-development costs will be recorded as a reduction to any revenue recognized under this collaboration in accordance with EITF 01-9. In the future, we will seek to



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generate revenue from a combination of license fees, research and development funding and milestone payments and royalties resulting from the sale of
products which incorporate our intellectual property in connection with strategic licenses and collaborations, and from sales of any products we successfully develop and commercialize, either alone or in partnership with third parties. We expect
that any revenue we generate will fluctuate from quarter to quarter as a result of the timing and amount of payments received under our strategic collaborations, and the amount and timing of payments we receive upon the sale of our products, to the
extent that any are successfully commercialized.



Research
and Development.    Research and development expense consists of costs incurred to discover, research and develop product candidates. These expenses consist primarily of salaries and related expenses for personnel, outside
service costs including medicinal chemistry, consulting and sponsored research collaborations, and occupancy and depreciation charges. We expense research and development costs as incurred.



The following table summarizes our primary research and development programs,
including the current development status of each program. In the table below, the term early preclinical means we are seeking to obtain initial demonstrations of therapeutic efficacy in preclinical models of human disease, mid-preclinical means we
are seeking to obtain multiple demonstrations of efficacy in preclinical models of human disease, and late preclinical means we are seeking to obtain both multiple demonstrations of efficacy in preclinical models of human disease and relevant
toxicology and safety data required for an investigation new drug application filing with the FDA, referred to as an IND in the table below, seeking to commence a phase I clinical trial to assess safety in humans.



Except for the public disclosures of Genentech, all of our estimates below
regarding planned filing dates for investigational new drug applications for our product development programs are solely our judgments. These estimates may not reflect the plans of our corporate collaborators or licensors, if applicable. Moreover,
because of the early stage of development of these programs, our ability and that of our collaborators and licensors to successfully complete preclinical studies of these product candidates, and the timing of completion of such programs, is highly
uncertain. Accordingly, the estimated period in which we or our collaborators or licensors may file an investigational new drug application for any of these product candidates may vary materially from the estimates set forth below:



|                                                  |  |                            |  |                                    |  |                  |  |                               
|------------------------------------------------- |  | -------------------------- |  | ---------------------------------- |  | ---------------- |  | ------------------------------
|Product Candidate                                 |  | Primary Indication         |  | Collaborator/Licensee              |  | Status           |  | Estimated period of IND
Filing
|Hh topical small molecule antagonist              |  | Basal cell carcinoma       |  | Genentech(1)                       |  | Late preclinical |  | March 31, 2005                
|Hh systemic small molecule or antibody antagonist |  | Cancer                     |  | Genentech                          |  | Mid preclinical  |  | 2006                          
|BMP-7 protein                                     |  | Kidney disease             |  | Ortho Biotech Products(2)          |  | Late preclinical |  | Late 2005 /Early 2006         
|Hh small molecule agonist                         |  | Nervous system disorders   |  | Wyeth                              |  | Mid preclinical  |  | 2006                          
|Hh small molecule agonist                         |  | Hair growth                |  | Internal development(3)            |  | Late preclinical |  | 2006                          
|Hh agonist/protein/gene                           |  | Cardiovascular disease     |  | Internal development(3),(4)        |  | Mid preclinical  |  | To be determined(5)           
|Discovery research                                |  | Spinal muscular atrophy    |  | Spinal Muscular Atrophy Foundation |  | Discovery        |  | To be determined(5)           
|Discovery research                                |  | Undisclosed pathway        |  | Genentech                          |  | Discovery        |  | To be determined(5)           
|Discovery research                                |  | Various signaling pathways |  | Internal development               |  | Discovery        |  | To be determined(5)           

---

|(1) |  | Genentech filed an investigational new drug application for our basal cell carcinoma product candidate on March 31, 2005.
|--- |  | -------------------------------------------------------------------------------------------------------------------------



|(2) |  | This product candidate has been licensed to Ortho Biotech Products. Under the license arrangement, we expect to incur no future costs related to these programs, assuming the license
agreement remains in effect. All development decisions are at the sole discretion of Ortho Biotech Products.
|--- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(3) |  | Our Hh small molecule agonists were licensed to Wyeth under our collaboration agreement, effective February 2004. Under the terms of our collaboration agreement with Wyeth, our
retained rights to use Hh small molecule agonists in our hair loss and cardiovascular disease programs are subject to the requirement that Wyeth must first determine that such compounds are less suitable for systemic use in the Wyeth neurological
disorders program and thus available for further development in our hair loss and cardiovascular disease programs. In December 2004, Wyeth made several compounds available to us for our further development in the hair growth program.
|--- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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|(4) |  | We have incurred nominal expenses related to our cardiovascular disease program. Our preclinical data relating to this program has been derived from studies conducted at Caritas St.
Elizabeths Medical Center in Boston, Massachusetts. We have entered into agreements under which additional third-party collaborators are attempting to replicate this preclinical data. We cannot estimate the period in which we will make an
investigational new drug filing for this program since we have not yet replicated the preclinical data and any investigational new drug filing will be dependent on the successful replication of these data. In addition, should we be successful in our
efforts to license this program in 2005, any investigational new drug filing will ultimately be the responsibility of a strategic collaborator. Wyeth has a right of first negotiation to obtain an exclusive license to the cardiovascular applications.
If Wyeth declines to exercise its option, or if we are unable to reach an agreement with Wyeth on terms within the contractually specified period, we are free to seek another collaborator for this program.
|--- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|(5) |  | The programs included within this section are not well enough defined for us to generate estimates regarding the timing of filing an investigational new drug application.
|--- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------



There is a risk that any drug discovery and
development program may not produce products or revenue. Due to uncertainties inherent in drug discovery and development, including those factors described below under Risk Factors That May Affect Results, we and our collaborators may
not be able to successfully develop and commercialize any of the product candidates included in the table above.



Genentech and we are co-developing a Hedgehog small molecule antagonist formulated for the topical treatment of basal cell carcinoma. Genentech and we
will share equally in all U.S. development costs. As a result of our election to exercise our co-development option, we will forego U.S. development and drug approval milestones and royalty payments on potential future U.S. sales of the basal cell
carcinoma product candidate. On March 31, 2005, Genentech filed an investigational new drug application with the FDA. We expect that we will incur approximately $20,000,000 in development expenses through phase II clinical trials and we
anticipate that these trials will be completed in mid-2007, assuming the successful advancement of the basal cell carcinoma product candidate through phase I and phase II clinical trials. We expect to incur additional costs to complete phase III
clinical trials and the remainder of the regulatory approval process, assuming that Genentech and we successfully complete phase II clinical trials. Due to the uncertainties that are inherent to the drug discovery process, as more fully described
below, we are not currently able to estimate the cost and timing to complete the phase III trial and receive regulatory approval of this product candidate, if ever.



Except for our basal cell carcinoma product candidate, all of our product development initiatives are in various stages of
preclinical testing. Because of the early stages of these programs, the successful development of our preclinical product candidates is highly uncertain. We cannot reasonably estimate or know the nature, timing and estimated costs of the efforts
necessary to complete the development of, or the period in which material net cash inflows are expected to commence from any of our product candidates due to the numerous risks and uncertainties associated with developing drugs, including the
uncertainty of:



All of our product development initiatives
are in various stages of preclinical testing. Because of the early stage of these programs, the successful development of our preclinical product candidates is highly uncertain. We cannot reasonably estimate or know the nature, timing and estimated
costs of the efforts necessary to complete the development of, or the period in which material net cash inflows are expected to commence from any of our product candidates due to the numerous risks and uncertainties associated with developing drugs,
including the uncertainty of:



| |  |  | the timing of when collaborators may make compounds that are subject to our retained rights available for our development;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | the scope, quality of data, rate of progress and cost of clinical trials and other research and development activities undertaken by us or our collaborators;
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | future clinical trials results;
| | - |  | -------------------------------



| |  |  | the terms and timing of any collaborative, licensing and other arrangements that we may establish;
| | - |  | --------------------------------------------------------------------------------------------------



| |  |  | the cost and timing of regulatory approvals;
| | - |  | --------------------------------------------



| |  |  | the cost and timing of establishing sales, marketing and distribution capabilities;
| | - |  | -----------------------------------------------------------------------------------



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| |  |  | the cost of establishing clinical and commercial supplies of our product candidates and any products that we may develop;
| | - |  | -------------------------------------------------------------------------------------------------------------------------



| |  |  | the effect of competing technological and market developments; and
| | - |  | ------------------------------------------------------------------



| |  |  | the cost of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights.
| | - |  | ------------------------------------------------------------------------------------------------------------------



Any failure to complete the development of our product candidates in a timely
manner could have a material adverse effect on our operations, financial position and liquidity. A discussion of risks and uncertainties associated with completing our projects on schedule, or at all, and some consequences of failing to do so, are
set forth below in Risk Factors That May Affect Results.



In December 2004, we received a development plan and budget from Genentech relating to the clinical development of a small molecule formulated for topical treatment for basal cell carcinoma. We and Genentech will co-develop this product
candidate and will share equally in all U.S. development costs. Based on Genentechs budget, we expect that we will incur approximately $20,000,000 in development expenses through phase II clinical trials. On March 31, 2005, Genentech filed an
investigational new drug application with the FDA, and assuming the acceptance of the investigational new drug application by the FDA and the successful advancement of the basal cell carcinoma product candidate through phase I and phase II clinical
trials, we expect that the phase II clinical trial will be completed in mid-2007. We expect to incur additional costs to complete phase III clinical trials and complete the regulatory approval process, assuming that we and Genentech successfully
complete phase II clinical trials.



General and
Administrative.    General and administrative expense consists primarily of salaries and other related costs for personnel in executive, finance, accounting, business development, legal, information technology, corporate
communications and human resource functions. Other costs include facility costs not otherwise included in research and development expense, insurance, and professional fees for legal, patent and accounting services.



Strategic Alliances and License
Agreements.    Since inception, substantially all of our revenue has been derived from collaborations and other research and development arrangements with third parties. Our current strategic collaborations and key license
agreements are with Genentech, Wyeth and Ortho Biotech Products. These strategic license and collaboration agreements included $18,000,000 in up-front payments, including $5,000,000 from the sale of shares of our common stock, and potential future
clinical development milestones of approximately $650,000,000 in the aggregate, assuming that all of the collaborations continue for their full terms and all milestone payments are received upon successful completion of specified research and
development objectives.



The collaborations and licenses are
summarized as follows:



Genentech Hedgehog Antagonist
Collaboration.    In June 2003, we licensed our proprietary Hedgehog pathway antagonists to Genentech for human therapeutic use. The primary focus of the collaborative research plan has been to develop these molecules for
cancer indications. The collaboration consists of two programs: the development of a small molecule Hedgehog antagonist formulated for the topical treatment for basal cell carcinoma; and the development of systemically administered small molecule
and antibody Hedgehog antagonists for the treatment of certain other solid tumor cancers. Pursuant to the collaboration agreement, Genentech agreed to make specified cash payments, including up-front payments of $8,500,000, which consisted of a
$3,509,000 non-refundable license fee payment and $4,991,000 in exchange for 1,323,835 shares of our common stock. Genentech also agreed to make license maintenance fee payments totaling $4,000,000 over the first two years of the collaboration and
milestone payments at various intervals during the clinical development and regulatory approval process of small molecule and antibody Hedgehog antagonist product candidates, assuming specified clinical development and regulatory approval objectives
are met. In addition, Genentech will pay a royalty on potential future net product sales, which increases with increasing sales volume. As described below, in December 2004, we entered into an amendment to this agreement which modified the
maintenance and the payment arrangement.



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In January 2005, pursuant to the collaboration agreement we exercised an option to co-develop Hedgehog
antagonist products in the field of basal call carcinoma in the U.S. We are now sharing equally in both U.S. development costs and any future U.S. net profits and/or losses resulting from the development and commercialization of our basal cell
carcinoma product candidate. This co-development right includes basal cell carcinoma and any additional indications for which this product candidate may be developed in the U.S. As a result of participating in co-development, we will forego U.S.
development milestone and royalty payments on potential future U.S. sales of the basal cell carcinoma product candidate. Should we determine that we cannot continue funding our equal share of the development expenses, we may opt out of the
co-development structure and receive certain development and regulatory approval milestones and royalties on sales of the basal cell carcinoma product candidate, should any ever occur. On March 31, 2005, Genentech filed an investigational new
drug application for the basal cell carcinoma product candidate with the FDA. In addition to our co-development rights in the U.S. marketplace, in certain major international markets, we will receive milestones if specific clinical development
objectives are achieved and a royalty on any international sales of a basal cell carcinoma product candidate.



Under the systemic Hedgehog antagonist program of the collaboration, Genentech is also obligated to make milestone payments to us assuming the successful
achievement of clinical development and drug approval objectives. In addition, Genentech will pay a royalty on potential future net product sales, which increases with increasing sales.



Amendments to the Genentech Hedgehog Antagonist Collaboration.    In December 2004 and April
2005, we entered into separate amendments to our June 2003 agreement with Genentech. We considered the provisions of EITF 00-21 and determined that these agreements were separate contracts from our June 2003 agreement since these agreements were not
contemplated at the time of the June 2003 arrangement, were separately negotiated in order to increase the number of full-time equivalents providing research and development services and to provide xenograft tumor samples to Genentech, and were not
entered into at or near the time of the June 2003 agreement.



The December 2004 amendment, effective from June 12, 2004 to June 11, 2005, increases our commitment of full-time equivalents providing research and development services for the systemic Hedgehog antagonist program from eight to
sixteen, including six full-time equivalents that are employed by a third party but are managed by us, and increases Genentechs funding commitment from $2,000,000 to $4,000,000 for this period of which Genentech paid us $2,000,000 for research
services in December 2004 and the remaining $2,000,000 for subsequent research services was paid in June 2005. Pursuant to the agreement, we also agreed to provide xenograft tumor samples to Genentech during the research period for which Genentech
paid us $100,000 in December 2004. Also in accordance with the amendment, the second $2,000,000 maintenance payment due under the June 2003 arrangement was removed with no economic effect since it was replaced by a $2,000,000 payment for research
services made to us in December 2004.



The April 2005
amendment, effective from June 12, 2005 to June 11, 2006, provides for up to sixteen of our full-time equivalent researchers, including six full-time equivalents that are employed by a third party but are managed by us, to provide research
and development services for the systemic Hedgehog antagonist program for the period of June 12, 2005 until December 11, 2005, in exchange for an additional $2,000,000, which was paid in December 2005. The agreement also provides Genentech
with the option to request that we provide up to sixteen full-time equivalent researchers to perform research services during the period of December 12, 2005 until June 11, 2006, provided that Genentech supplies us with adequate notice.



Genentech Discovery Research
Collaboration.    On April 1, 2005, we entered into a drug discovery collaboration agreement with Genentech for discovery and development of small molecule compounds that modulate a signaling pathway that plays an
important role in cell proliferation. This pathway is a regulator of tissue growth, formation and repair, the abnormal activation of which is associated with certain cancers. Under the terms of the agreement, we have granted Genentech an exclusive,
royalty-bearing license to make, use and sell the small molecule compounds that are modulators of the pathway. We have retained the rights for ex vivo cell therapy, except in the areas of oncology and hematopoiesis.



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Under the terms of the agreement, we will have primary responsibility for drug discovery and research
activities and Genentech will be responsible for clinical development, manufacturing, and commercialization of products that may result from the collaboration. Genentech paid us an up-front license fee of $3,000,000 and has agreed to fund up to
$6,000,000 for research activities during the initial two-year research term, subject to certain termination rights. Genentech has also agreed to make cash payments to us that are contingent upon the successful achievement of certain preclinical and
clinical development milestones and drug approval milestones. Excluding royalties on potential net product sales, the total potential cash payments from this collaboration could exceed $140,000,000, assuming that two products are commercialized in
two indications each. Genentech has an option to extend the initial two-year research term for up to two additional years in one-year increments. Genentech will also pay us royalties on net product sales if product candidates derived from the
collaboration are successfully developed.



Wyeth Hedgehog
Agonist Collaboration.    In January 2004, we licensed our Hedgehog proteins and small molecule Hedgehog pathway agonists to Wyeth Pharmaceuticals, or Wyeth, for therapeutic applications in the treatment of neurological
diseases and other disorders. Pursuant to the collaboration agreement, Wyeth agreed to make specified cash payments, including up-front payments of $3,000,000, which consisted of a $1,362,000 non-refundable license fee payment and $1,638,000 in
exchange for 315,524 shares of our common stock.



Wyeth is also
obligated to make milestone payments if the licensed programs successfully achieve clinical development and drug approval objectives and to pay us a royalty on net product sales, if any should occur, that escalates with increasing sales volume. Our
agreement with Wyeth includes more than $170 million in milestone payments, assuming at least two products are successfully developed and commercialized.



In addition to these initial and potential future milestone payments, Wyeth is obligated to provide financial support of our research under the
collaboration, at $250,000 per full-time equivalent researcher, for a period of up two years based on the number of full-time equivalent researchers performing services under the collaboration. We are obligated to dedicate between five and ten
full-time equivalents to this program, as determined by the steering committee in six-month intervals, for two years. After the initial two-year period, Wyeth can, at its option, elect to extend our research obligation, and Wyeths funding
thereof, for an initial one-year extension on the same terms and conditions as the initial two-year term. Thereafter, the agreement may be extended for additional one-year periods upon recommendation of the steering committee and with the
Companys consent with such full-time equivalent resources and related Wyeth funding obligations as may be consistent with fulfilling the objectives of the research plan. The senior Wyeth representative on the Joint Steering Committee has the
deciding vote in the event the parties disagree on matters relating to the research program. The agreement provides for a one-year evaluation period immediately following the end of the research term, during which we may be obligated to serve on the
steering committee and may be required, at Wyeths expense, to perform additional research and development services. We currently estimate we will only be required to provide steering committee services during the evaluation period if we are
also performing research services during that period.



As part
of the agreement, we have retained development and licensing options for certain therapeutic applications of the Hedgehog agonist technologies, including topical treatment for skin diseases and disorders including hair growth regulation, ex vivo
cell therapy, local delivery applications for treatment of cardiovascular disease, and those applications that qualify as orphan drug indications. Wyeth has a right of first negotiation to obtain an exclusive license to the orphan drug indications
and the cardiovascular applications. If Wyeth declines to exercise its right, or if we are unable to reach an agreement with Wyeth on terms within the contractually specified period, we are free to seek another collaborator for these programs.



Ortho Biotech Products BMP
License.    In November 2002, we licensed our broad bone morphogenetic protein, or BMP, technology portfolio to Ortho Biotech Products, L.P., a member of the Johnson & Johnson family of companies. Two of Ortho
Biotech Products research affiliates, Johnson & Johnson Pharmaceutical Research & Development, L.L.C. and Centocor Research & Development, also members of the Johnson & Johnson family of companies, will have
joint responsibility for further research and development of our licensed BMP technology portfolio.



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The transaction relates to all of our proprietary BMP compounds including BMP-7, which has been studied
in animal models in various disease indications, including as a treatment for chronic kidney disease and systemic complications, such as renal osteodystrophy, a form of bone disease, and blood vessel complications that have been associated with
chronic kidney disease. Use of our BMPs for the repair or regeneration of local musculoskeletal tissue defects and dental defects is the subject of an exclusive agreement with Stryker and is not included as part of this transaction.



Pursuant to the agreement, Ortho Biotech paid us an up-front payment of
$3,500,000, in December 2002, and has agreed to make milestone payments at various intervals during the U.S. and European regulatory approval process assuming the first two therapeutic indications are successfully developed. These milestones include
a $30,000,000 payment if Ortho Biotech achieves U.S. regulatory approval of a product for the treatment of kidney disease or associated complications. The agreement further specifies that we will receive a royalty on net sales of products that
incorporate our BMP technologies. Unless terminated earlier, the agreement shall remain in effect until the expiration of Ortho Biotechs obligation to pay royalties to us under the agreement.



Critical Accounting Policies and Estimates



The preparation of our consolidated financial statements in conformity with
accounting principles generally accepted in the United States requires that we make estimates and assumptions that affect the reported amounts and disclosure of certain assets and liabilities at our balance sheet date. Such estimates and judgments
include the carrying value of property and equipment and intangible assets, revenue recognition and the value of certain liabilities. We base our estimates on historical experience and on various other factors that we believe to be appropriate under
the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different
assumptions or conditions. We believe the following accounting policies to be critical to understanding the judgments and estimates we use in preparing our financial statements:



Revenue recognition.    Our business strategy includes entering into collaborative license and
development agreements with biotechnology and pharmaceutical companies for the development and commercialization of our product candidates. The terms of the agreements typically include non-refundable license fees, funding of research and
development, payments based upon achievement of clinical development milestones and royalties on product sales. We follow the provisions of the Securities and Exchange Commissions Staff Accounting Bulletin, or SAB, No. 104, Revenue
Recognition, Emerging Issues Task Force, or EITF, Issue No. 00-21, Accounting for Revenue Arrangements with Multiple Deliverables, EITF Issue No. 99-19, Reporting Revenue Gross as a Principal Versus Net as an Agent,and EITF
Issue No. 01-9, Accounting for Consideration Given by a Vendor to a Customer (Including a Reseller of the Vendors Products).



Non-refundable license fees are recognized as revenue when we have a contractual right to receive such payment, the contract price is fixed or
determinable, the collection of the resulting receivable is reasonably assured and we have no further performance obligations under the license agreement. Multiple element arrangements, such as license and development arrangements are analyzed to
determine whether the deliverables, which often include a license and performance obligations such as research and steering committee services, can be separated or whether they must be accounted for as a single unit of accounting in accordance with
EITF 00-21. We recognize up-front license payments as revenue upon delivery of the license only if the license has stand-alone value and the fair value of the undelivered performance obligations, typically including research or steering committee
services, can be determined. If the fair value of the undelivered performance obligations can be determined, such obligations would then be accounted for separately as performed. If the license is considered to either (i) not have stand-alone
value or (ii) have standalone value but the fair value of any of the undelivered performance obligations cannot be determined, the arrangement would then be accounted for as a single unit of accounting and the license payments and payments for
performance obligations are recognized as revenue over the estimated period of when the performance obligations are performed.



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Whenever we determine that an arrangement should be accounted for as a single unit of accounting, we must
determine the period over which the performance obligations will be performed and revenue will be recognized. Revenue will be recognized using either a relative performance or straight-line method. We recognize revenue using the relative performance
method provided that we can reasonably estimate the level of effort required to complete its performance obligations under an arrangement and such performance obligations are provided on a best-efforts basis. Direct labor hours or full-time
equivalents are typically used as the measure of performance. Revenue recognized under the relative performance method would be determined by multiplying the total payments under the contract, excluding royalties and payments contingent upon
achievement of substantive milestones, by the ratio of level of effort incurred to date to estimated total level of effort required to complete our performance obligations under the arrangement. Revenue is limited to the lesser of the cumulative
amount of payments received or the cumulative amount of revenue earned, as determined using the relative performance method, as of each reporting period.



If we cannot reasonably estimate the level of effort required to complete our performance obligations under an arrangement, the performance obligations
are provided on a best-efforts basis and we can reasonably estimate when the performance obligation ceases or becomes inconsequential, then the total payments under the arrangement, excluding royalties and payments contingent upon achievement of
substantive milestones, would be recognized as revenue on a straight-line basis over the period we expect to complete our performance obligations. Revenue is limited to the lesser of the cumulative amount of payments received or the cumulative
amount of revenue earned, as determined using the straight-line basis, as of the period ending date.



If we cannot reasonably estimate when our performance obligation either ceases or becomes inconsequential, then revenue is deferred until we can
reasonably estimate when the performance obligation ceases or becomes inconsequential.



Significant management judgment is required in determining the level of effort required under an arrangement and the period over which we are expected to complete its performance obligations under an arrangement. In
addition, if we are involved in a steering committee as part of a multiple element arrangement that is accounted for as a single unit of accounting, we assess whether our involvement constitutes a performance obligation or a right to participate.
Steering committee services that are not inconsequential or perfunctory and that are determined to be performance obligations are combined with other research services or performance obligations required under an arrangement, if any, in determining
the level of effort required in an arrangement and the period over which we expect to complete our aggregate performance obligations.



Collaboration agreements may also contain substantive milestone payments. Substantive milestone payments are considered to be performance bonuses that are
recognized upon achievement of the milestone only if all of the following conditions are met:



| |  |  | the milestone payments are non-refundable;
| | - |  | ------------------------------------------



| |  |  | achievement of the milestone involves a degree of risk and was not reasonably assured at the inception of the arrangement;
| | - |  | --------------------------------------------------------------------------------------------------------------------------



| |  |  | substantive effort is involved in achieving the milestone;
| | - |  | ----------------------------------------------------------



| |  |  | the amount of the milestone payment is reasonable in relation to the effort expended or the risk associated with achievement of the milestone; and,
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | a reasonable amount of time passes between the up-front license payment and the first milestone payment as well as between each subsequent milestone payment.
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



Determination as to whether a payment meets the
aforementioned conditions involves managements judgment. If any of these conditions are not met, the resulting payment would not be considered a substantive milestone, and therefore the resulting payment would be considered part of the
consideration for the single unit of accounting and be recognized as revenue as such performance obligations are performed under either the



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relative performance or straight-line methods, as applicable, and in accordance with these policies as described above. In addition, the determination that
one such payment was not a substantive milestone would prevent us from concluding that subsequent milestone payments were substantive milestones and, as a result, any additional milestone payments would also be considered part of the consideration
for the single unit of accounting and would be recognized as revenue as such performance obligations are performed under either the relative performance or straight-line methods, as applicable.



Reimbursement of costs is recognized as revenue provided the provisions of
EITF 99-19 are met, the amounts are determinable, and collection of the related receivable is reasonably assured.



Royalty revenue is recognized upon the sale of the related products, provided that the royalty amounts are fixed or determinable, collection of the
related receivable is reasonably assured and we have no remaining performance obligations under the arrangement. If royalties are received when we have remaining performance obligations, the royalty payments would be attributed to the services being
provided under the arrangement and therefore would be recognized as such performance obligations are performed under either the relative performance or straight line methods, as applicable, and in accordance with these policies as described above.



For revenue generating arrangements where we, as a vendor,
provide consideration to a licensor or collaborator, as a customer, we apply the provisions of EITF 01-9. EITF 01-9 addresses the accounting for revenue arrangements where both the vendor and the customer make cash payments to each other for
services and/or products. A payment to a customer is presumed to be a reduction of the selling price unless we receive an identifiable benefit for the payment and we can reasonably estimate the fair value of the benefit received. Payments to a
customer that are deemed a reduction of selling price are recorded first as a reduction of revenue, to the extent of both cumulative revenue recorded to date and of probable future revenues, which include any unamortized deferred revenue balances,
under all arrangements with such customer and then as an expense. Payments that are not deemed to be a reduction of selling price would be recorded as an expense.



Amounts received prior to satisfying the above revenue recognition criteria are recorded as deferred revenue in the
accompanying consolidated balance sheets. Amounts not expected to be recognized during the twelve-month period ended March 31, 2006 are classified as long-term deferred revenue. As of March 31, 2005, we have short- and long-term deferred
revenue of 694,000 and $8,288,000, respectively, related to our collaborations.



Although we follow detailed guidelines in measuring revenue, certain judgments affect the application of our revenue policy. For example, in connection with our existing collaboration agreements, we have recorded on
our balance sheet short- and long-term deferred revenue based on our best estimate of when such revenue will be recognized. Short-term deferred revenue consists of amounts that are expected to be recognized as revenue, or applied against future
co-development costs, by March 31, 2006. Amounts that we expect will not be recognized prior to March 31, 2006 are classified as long-term deferred revenue. However, this estimate is based on our current operating plan as of March 31,
2005. If our operating plan should change in the future, we may recognize a different amount of deferred revenue over the twelve-month period from April 1, 2005 through March 31, 2006.



The estimate of deferred revenue also reflects managements estimate of
the periods of our involvement in certain of our collaborations. Our performance obligations under these collaborations consist of participation on steering committees and the performance of other research and development services. In certain
instances, the timing of satisfying these obligations can be difficult to estimate. Accordingly, our estimates may change in the future. Such changes to estimates would result in a change in revenue recognition amounts. If these estimates and
judgments change over the course of these agreements, it may affect the timing and amount of revenue that we recognize and record in future periods.



Goodwill.    We assess the impairment of goodwill whenever events or changes in circumstances indicate that the carrying value
may not be recoverable. In addition, we perform a goodwill impairment test annually. If we determined that the carrying value of goodwill might not be recoverable based upon the existence of one or more indicators of impairment, we would measure any
impairment based on a projected cash flow method.



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Valuation of investments in privately held companies.    We have investments
in Aegera, Micromet and ES Cell International with carrying values of $167,000, $100,000 and $150,000, respectively. These investments are included in the Deposits and other assets category of our consolidated balance sheets. At
each balance sheet date, we review these investments to determine whether the fair value of these investments is less than the carrying value and, if so, whether we should write-down the investment. These companies are not publicly traded and,
therefore, determining the fair value of our investments in these companies involves significant judgment. We consider available information in estimating the fair value of these investments and, as of September 30, 2005, we believe that the
fair value of these investments is not less than their carrying value.



If the financial condition or results of Aegera, Micromet or ES Cell decline significantly, the fair value of these investments would likely decline and, as a result, we may have to record an impairment charge to the extent such impairment
is deemed other than temporary.



The above list is not intended
to be a comprehensive list of all of our accounting policies. In many cases, the accounting treatment of a particular transaction is specifically dictated by generally accepted accounting principles, with no need for managements judgment in
their application. There are also areas in which managements judgment in selecting any available alternative would not produce a materially different result.



Results of Operations



Quarters Ended March 31, 2005 and March 31, 2004



Revenues.    Total revenues are summarized as follows:



|                                                   |  |                                     |            |                               |               |   |         |  |      |   
|-------------------------------------------------- |  | ----------------------------------- | ---------- | ----------------------------- | ------------- | - | ------- |  | ---- | --
|                                                   |  | For the Three Months EndedMarch 31, |            | PercentageIncrease/(Decrease) |              
|                                                   |  | 2005                                |            |                               | 2004          |  
|                                                   |  | (as restated)                       |            |                               | (as restated) |   |         | 
|REVENUES:                                          |  |                                     |            |                               |               |   |         |  |      |   
|Research and development contracts                 |  |                                     |            |                               |               |   |         |  |      |   
|Genentech                                          |  | $                                   | 979,000    |                               |               | $ | 153,000 |  | 540  | % 
|Wyeth                                              |  |                                     | 607,000    |                               |               |   | 301,000 |  | 102  | % 
|Spinal Muscular Atrophy Foundation                 |  |                                     | 588,000    |                               |               |   |        |  | 100  | % 
|                                                   |  |                                     |            |                               |               |   |         |  |      |   
|Subtotal                                           |  |                                     | 2,174,000  |                               |               |   | 454,000 |  | 379  | % 
|                                                   |  |                                     |           
|License fees                                       |  |                                     | 68,000     |                               |               |   | 38,000  |  | 79   | % 
|Substantive milestones                             |  |                                     | 250,000    |                               |               |   | 50,000  |  | 400  | % 
|                                                   |  |                                     |            |                               |               |   |         |  |      |   
|Gross Revenues                                     |  |                                     | 2,492,000  |                               |               |   | 542,000 |  | 360  | % 
|                                                   |  |                                     |           
|Contra-revenues from co-development with Genentech |  |                                     | (3,305,000 | )                             |               |   |        |  | (100 | %)
|                                                   |  |                                     |            |                               |               |   |         |  |      |   
|Net Revenue                                        |  | $                                   | (813,000   | )                             |               | $ | 542,000 |  | (250 | %)
|                                                   |  |                                     |            |                               |               |   |         |  |      |   



The $1,355,000, or
250%, decrease in net revenues for the three months ended March 31, 2005 as compared to the same period in the prior year, was primarily due to $3,305,000 in contra-revenue, or a reduction to gross revenues, related to our co-development
payments to Genentech. This reduction in gross revenue represents amounts owed for the reimbursement of our equal share of costs incurred by Genentech under our collaboration related to the co-development of a basal cell carcinoma therapeutic
product candidate.



Our contra-revenues were partially offset
by $1,720,000 increase in revenues from our research and development contracts, which increased from $454,000 for the three months ended March 31, 2004 to $2,174,000 for the three months ended March 31, 2005. Research and development
contract revenues for three



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months ended March 31, 2005 increased $1,543,000 from two new agreements entered into during the second half of 2004a sponsored research agreement
with the Spinal Muscular Atrophy Foundation and an agreement to extend research services to Genentech under our solid tumor program entered into April 2005.



Research and Development Expenses.    Research and development expenses are summarized as follows:



|                                          |  |                          |  |                                      |           |                               |   |           |  |     |   
|----------------------------------------- |  | ------------------------ |  | ------------------------------------ | --------- | ----------------------------- | - | --------- |  | --- | --
|                                          |  |                          |  | For the Three Months Ended March 31, |           | PercentageIncrease/(Decrease) |  
|Research and Development Program          |  | Primary Indication       |  | 2005                                 |           | 2004                          |  
|                                          |  |                          |  | (as restated)                        |           | (as restated)                 |   |           | 
|Hh small molecule antagonist              |  | Basal cell carcinoma     |  | $                                    | 16,000    |                               | $ | 48,000    |  | (67 | %)
|Hh small molecule and antibody antagonist |  | Cancer                   |  |                                      | 939,000   |                               |   | 1,021,000 |  | (8  | %)
|Hh small molecule agonist                 |  | Nervous system disorders |  |                                      | 704,000   |                               |   | 863,000   |  | (18 | %)
|Hh small molecule agonist                 |  | Hair loss                |  |                                      | 243,000   |                               |   | 185,000   |  | 31  | % 
|Discovery research                        |  | Spinal muscular atrophy  |  |                                      | 661,000   |                               |   |          |  | 100 | % 
|Discovery research                        |  | Various                  |  |                                      | 542,000   |                               |   | 680,000   |  | (20 | %)
|                                          |  |                          |  |                                      |           |                               |   |           |  |     |   
|Total research and development expense    |  |                          |  | $                                    | 3,105,000 |                               | $ | 2,797,000 |  | 11  | % 
|                                          |  |                          |  |                                      |           |                               |   |           |  |     |   



The increase of
$308,000 in total research and development expenses in the three months ended March 31, 2005 was primarily due to an increase in spending of $661,000, or 100%, on our discovery research program, which is under a sponsored research agreement with the
Spinal Muscular Atrophy Foundation. As this agreement was not entered into until September 2004, we incurred no expenses for this program during the period ended March 31, 2004. Reduced spending in other programs, particularly decreases of $159,000
and $138,000 in our Hedgehog small molecule agonist program for nervous system disorders and other discovery research program, respectively, offset this increase.



General and Administrative Expenses.    General and administrative expenses are summarized as
follows:



|                                          |  |                                     |           |                               |   |           |  |     |   
|----------------------------------------- |  | ----------------------------------- | --------- | ----------------------------- | - | --------- |  | --- | --
|                                          |  | For the Three Months EndedMarch 31, |           | PercentageIncrease/(Decrease) |  
|                                          |  | 2005                                |           | 2004                          |  
|Personnel                                 |  | $                                   | 745,000   |                               | $ | 791,000   |  | (6  | %)
|Occupancy and depreciation                |  |                                     | 134,000   |                               |   | 193,000   |  | (31 | %)
|Legal services                            |  |                                     | 291,000   |                               |   | 304,000   |  | (4  | %)
|Professional and consulting services      |  |                                     | 279,000   |                               |   | 269,000   |  | 4   | % 
|Insurance costs                           |  |                                     | 107,000   |                               |   | 133,000   |  | (20 | %)
|Other general and administrative expenses |  |                                     | 142,000   |                               |   | 225,000   |  | (37 | %)
|                                          |  |                                     |           |                               |   |           |  |     |   
|Total general and administrative expenses |  | $                                   | 1,698,000 |                               | $ | 1,915,000 |  | (11 | %)
|                                          |  |                                     |           |                               |   |           |  |     |   



The decrease in total
general and administrative expenses for the three months ended March 31, 2005, was primarily due to decreases in personnel costs of $46,000, occupancy and depreciation expenses of $59,000 and other general and administrative expenses of $83,000.
Other general and administrative expenses are comprised of travel expenses, temporary help, computer and office supplies.



Stock-based Compensation.    We recorded a $50,000 reversal of stock-based compensation expense for the three-month period
ended March 31, 2005 related to mark-to-market adjustments of stock options issued to non-employees. We recognized expense of $302,000 for the three-month period ended March 31, 2004, a decrease of $352,000, or 117%. The decrease was
primarily attributable to a decrease of compensation expense recorded on options to purchase common stock that were issued to employees with exercise prices below fair market value on August 18, 2000 that became fully vested as of
August 18, 2004. No related additional expense was recognized for these August 2000 stock options beyond August 2004. We recorded $257,000 in stock-based



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compensation related to these options for the three months ended March 31, 2004. We also recorded $45,000 in stock-based compensation related to
non-employee options for the period ended March 31, 2004. The decrease was also attributable to options issued to non-employees that are marked-to-market liabilities. As our stock price fluctuates, the liability either increases or decreases.
Because our stock price declined, we recorded a reversal for stock-based compensation.



Amortization of Intangibles.    Amortization of intangible assets was $19,000 for each of the three-month periods ended March 31, 2005 and 2004.



Interest Income.    Interest income was $259,000
for the three-month period ended March 31, 2005 as compared to $107,000 for the three-month period ended March 31, 2004, an increase of $152,000, or 142%. The increase in interest income resulted from higher interest rates and a higher available
investment balance for the period ended March 31, 2005.



Other Income.    Other income for the three-month period ended March 31, 2005 was $25,000 as compared to $154,000 for the three-month period ended March 31, 2004, a decrease of $129,000, or 84%. For the quarter
ended March 31, 2004, other income primarily consisted of an adjustment to an estimate of an amount payable to a former collaborator.



Interest Expense.    Interest expense for the three-month period ended March 31, 2005 was $82,000 as compared to $111,000 for
the three-month period ended March 31, 2004, a decrease of $29,000, or 26%. The decrease in interest expense was attributable to a decrease in interest expense accrued under our convertible note payable to Elan Pharma International Limited, or EPIL,
an affiliate of Elan Corporation. We recorded $8,000 and $46,000, respectively, for the three-month periods ended March 31, 2005 and 2004 under the convertible note payable to EPIL. In addition, we recorded $26,000 and $17,000, respectively, for the
three-month periods ended March 31, 2005 and 2004 under our debt and capital lease obligations. At March 31, 2005, we had outstanding debt of $2,250,000 under a loan agreement with Boston Private Bank & Trust Company.



Net Loss Applicable to Common Stockholders.    As
a result of the foregoing, we incurred a net loss applicable to common stockholders of $5,381,000 for the three-month period ended March 31, 2005 as compared to a net loss applicable to common stockholders of $4,341,000 for the three-month period
ended March 31, 2004.



Liquidity and Capital Resources



We have financed our operations primarily through license fees, research and
development funding from our collaborators, the private and public placement of our equity securities, debt financings and the monetization of certain royalty rights.



At March 31, 2005, our principal sources of liquidity consisted of cash, cash equivalents, and marketable securities of
$45,896,000, excluding restricted long-term investments of $193,000. Our cash and cash equivalents are highly liquid investments with a maturity of three months or less at date of purchase and consist of time deposits and investments in money market
funds with commercial banks and financial institutions, short-term commercial paper, and government obligations. We also maintain cash balances with financial institutions in excess of insured limits. However, we do not anticipate any losses with
respect to such cash balances because the balances are invested in highly rated securities. Our marketable securities are investments with original maturities of greater than three months, but less than twelve months, and consist of commercial
paper, corporate debt securities, and government obligations.



The use of our cash flows for operations has primarily consisted of salaries and wages for our employees, facility and facility-related costs for our office and laboratory, fees paid in connection with preclinical studies, laboratory
supplies, consulting fees, and legal fees. To date, the source of our cash flows from operations has been payments received from our collaborators. In general, our only source of cash flows from operations for the foreseeable future will be the
up-front license payments, payments for the achievement of milestones, if any, and funded research and development that we may receive under collaboration agreements. The timing of any new



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collaboration agreements and any payments under existing collaboration agreements cannot be easily predicted and may vary significantly from quarter to
quarter.



Net cash used in operating activities was $5,397,000
for the three-month period ended March 31, 2005 as compared to $1,618,000 for the three-month period ended March 31, 2004. Cash used in operating activities during the three-month period ended March 31, 2005 was primarily the result of our net loss
for the period partially offset by an increase in working capital and by non-cash charges including depreciation, amortization and non-cash interest expense. Cash used in operating activities during the three-month period ended March 31, 2004 was
primarily the result of our net loss for the period partially offset by non-cash charges including stock-based compensation, depreciation and non-cash interest expense. In addition, increases in operating cash as a result of changes in certain
current assets and liabilities during the three-month period ended March 31, 2004, including a $1,362,000 up-front payment received for a licensing agreement with Wyeth, further offset our net loss.



Investing activities used cash of $933,000 for the three-month period ended
March 31, 2005 as compared to $8,741,000 used in the three-month period ended March 31, 2004. Net cash used in investing activities resulted principally from $946,000 in fixed asset purchases for the three months ended March 31, 2005. We expect that
we will continue to use cash in our investing activities as we expand our infrastructure. Cash used results principally from $8,656,000 in net investment purchases for the quarter ended March 31, 2004.



Financing activities provided cash of approximately $1,180,000 for the
three-month period ended March 31, 2005, resulting from proceeds of $1,110,000 from the issuance of debt for the purchase of fixed assets and $70,000 received upon stock option exercises. Financing activities provided approximately $2,334,000 of
cash for the three-month period ended March 31, 2004, resulting primarily from the sale of our common stock, including the sale of 315,524 shares to Wyeth and proceeds received upon stock option exercises. This increase was offset by $320,000 in
repayments of obligations under capital leases.



Pursuant to
our co-development arrangement with Genentech, under which we share equally in U.S. development costs and any future net profits and/or losses derived from sales in the U.S. of a therapeutic product candidate for the topical treatment of basal cell
carcinoma, we expect that we will incur approximately $20,000,000 in development expenses through phase II clinical trials, of which $2,178,000 was paid during the first quarter of 2005 and an additional $1,127,000 has been accrued. Genentech filed
an investigational new drug application with the FDA on March 31, 2005 in order to initiate human clinical investigation of the basal cell carcinoma product candidate. Assuming the acceptance of the investigational new drug application by the FDA
and the successful advancement of the basal cell carcinoma product candidate through phase I and phase II clinical trials, we expect that the phase II clinical trial will be completed in mid-2007. We expect to incur additional costs to complete
phase III clinical trials and complete the regulatory approval process, assuming that Genentech and we successfully complete phase II clinical trials.



Effective January 7, 2005, we entered into an amendment with the Boston Private Bank & Trust Company to extend the drawdown date in which we can
request periodic financings up to $2,250,000 for qualifying purchases of equipment and leaseholds under the loan agreement through April 30, 2005. On March 23, 2005, we drew down the remaining balance under this agreement bringing the total amount
financed to $2,250,000 and exercised our option to convert the outstanding balance into a 36-month term note that bears interest at a fixed rate of 7.36% for the repayment period. Under the terms of the note payable, we are required to make equal
monthly payments of $62,500 beginning on May 1, 2005 extending through the 36-month term. The loan is collateralized by all of our property, plant and equipment assets, except for those that are affixed to the property and those that are purchased
after March 23, 2005 under purchase money arrangements with equipment lenders. As of March 31, 2005, we were in compliance with the sole covenant under this agreement. Should we fail to pay amounts when due or fail to maintain compliance with the
covenant under this agreement, the entire obligation becomes immediately due at the option of the Boston Private Bank & Trust Company.



On June 26, 2001, we received $2,000,000 from Becton Dickinson under a convertible subordinated note payable in connection with the exercise by Becton
Dickinson of an option to negotiate a collaboration agreement.



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The note is repayable at any time up to its maturity date of June 26, 2006 by us, at our discretion, in either cash or upon issuance to Becton Dickinson of
shares of our common stock. The note bears interest at 7%. As of March 31, 2005, there was approximately $2,527,000, including approximately $527,000 in accrued interest, outstanding under the note agreement.



Contractual Obligations



In addition to our loan agreement with Boston Private Bank & Trust Company, we also have contractual obligations related
to our facility lease, research services agreements, consulting agreements, and license agreements. The following table summarizes our contractual obligations due by the period indicated at March 31, 2005:



|                                           |  |                       |       |      |   |       |  |      |       |      |   |            |  |       |     |  |   |     |  |   |       
|------------------------------------------ |  | --------------------- | ----- | ---- | - | ----- |  | ---- | ----- | ---- | - | ---------- |  | ----- | --- |  | - | --- |  | - | ------
|                                           |  | (amounts in 000s)(1)
|                                           |  | Remainderof 2005      |       | 2006 |   | 2007  |  | 2008 |       | 2009 |   | Thereafter |  | Total
|Convertible subordinated long-term debt(2) |  | $                     |      |      | $ | 2,805 |  | $    |      |      | $ |           |  | $     |    |  | $ |    |  | $ | 2,805 
|Debt obligations under note payable        |  |                       | 600   |      |   | 853   |  |      | 798   |      |   | 254        |  |       |    |  |   |    |  |   | 2,505 
|Operating lease obligations                |  |                       | 610   |      |   | 1,323 |  |      | 1,105 |      |   | 948        |  |       | 948 |  |   | 948 |  |   | 5,882 
|Outside service obligations(3)             |  |                       | 1,206 |      |   |      |  |      |      |      |   |           |  |       |    |  |   |    |  |   | 1,206 
|Licensing obligations                      |  |                       | 225   |      |   |      |  |      |      |      |   |           |  |       |    |  |   |    |  |   | 225   
|                                           |  |                       |       |      |   |       |  |      |       |      |   |            |  |       |     |  |   |     |  |   |       
|Total future obligations.                  |  | $                     | 2,641 |      | $ | 4,981 |  | $    | 1,903 |      | $ | 1,202      |  | $     | 948 |  | $ | 948 |  | $ | 12,623
|                                           |  |                       |       |      |   |       |  |      |       |      |   |            |  |       |     |  |   |     |  |   |       

---

|(1) |  | Obligations do not include amounts we will owe Genentech under our co-development arrangement.
|--- |  | ----------------------------------------------------------------------------------------------



|(2) |  | Convertible subordinated debt is convertible into either shares of our common stock or cash at our option.
|--- |  | ----------------------------------------------------------------------------------------------------------



|(3) |  | Outside service obligations consist of agreements we have with outside labs, consultants and various other service organizations.
|--- |  | ---------------------------------------------------------------------------------------------------------------------------------



We anticipate that existing capital resources at March 31, 2005, should
enable us to maintain current and planned operations into mid-2007, including spending related to the co-development of our basal cell carcinoma product candidate under development with Genentech. We expect to incur substantial additional research
and development and other costs, including costs related to preclinical studies and clinical trials for the foreseeable future. Our ability to continue funding planned operations beyond mid-2007 is dependent upon the success of our collaborations,
our ability to maintain or reduce our cash burn rate and our ability to raise additional funds through equity or debt financings, or from other sources of financing. Our ability to generate sufficient cash flows depends on a number of factors,
including the ability of either us, or our collaborators, to obtain regulatory approval to market and commercialize products to treat indications in major commercial markets. We are seeking additional collaborative arrangements and also expect to
raise funds through one or more financing transactions, if conditions permit. Due to our significant long-term capital requirements, we intend to seek to raise funds through the sale of debt or equity securities when conditions are favorable, even
if we do not have an immediate need for additional capital at such time. Additional financing may not be available or, if available, it may not be available on favorable terms. In addition, the sale of additional debt or equity securities could
result in dilution to our stockholders. If substantial additional funding is not available, our ability to fund research and development and other operations will be significantly affected and, accordingly, our business will be materially and
adversely affected.



Off-Balance Sheet Arrangements



We have no off-balance sheet arrangements as of March 31, 2005.



Inflation



We believe that inflation has not had a significant impact on our revenue and results of operations since inception.



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Factors That May Affect Results



RISKS RELATING TO OUR FINANCIAL RESULTS AND NEED FOR FINANCING



We have incurred substantial losses, we expect to continue to incur substantial losses and
we may never achieve profitability.



We expect to incur
substantial operating losses for the foreseeable future, and we have no current sources of material ongoing revenue. As of March 31, 2005, we had an accumulated deficit of approximately $670,580,000. Other than OP-1, which we and Stryker
commercialized under a former collaboration, we have not commercialized any products to date, either alone or with a third party collaborator. All of our product candidates are in early stages of development. If we are not able to commercialize any
products, whether alone or with a collaborator, we will not achieve profitability. Even if our collaboration agreements provide funding for a portion of our research and development expenses for some of our programs, we expect to spend significant
capital to fund our research and development programs for the foreseeable future. As a result, we will need to generate significant revenues in order to achieve profitability. We cannot be certain whether or when this will occur because of the
significant uncertainties that affect our business. Our failure to become and remain profitable may depress the market price of our common stock and could impair our ability to raise capital, expand our business, diversify our product offerings or
continue our operations.



We will require additional financing, which may be
difficult to obtain and may dilute your ownership interest in us.



We will require substantial funds to continue our research and development programs. In particular, our currently-planned operating and capital requirements primarily include the need for working capital to:



| |  |  | fund our portion of the development costs for a basal cell carcinoma drug candidate pursuant to our equal cost-sharing co-development arrangement with our collaborator, Genentech;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | support our research and development activities for our internal programs; and
| | - |  | ------------------------------------------------------------------------------



| |  |  | fund our general and administrative costs and expenses.
| | - |  | -------------------------------------------------------



We believe that our existing cash and working capital should be sufficient to fund our operations until mid-2007, however, our future capital requirements
may vary from what we expect. There are factors that may affect our future capital requirements and accelerate our need for additional financing. Many of these factors are outside our control, including the following:



| |  |  | continued progress in our research and development programs, as well as the magnitude of these programs;
| | - |  | --------------------------------------------------------------------------------------------------------



| |  |  | the cost of additional facilities requirements including the current expansion of the animal facility and such others as may be required;
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our ability to establish and maintain collaborative arrangements;
| | - |  | -----------------------------------------------------------------



| |  |  | the timing, receipt and amount of research funding and milestone, license, royalty and other payments, if any, from collaborators;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, payment and amount of research funding and milestone, license, royalty and other payments due to licensors of patent rights and technology used to make, use and sell our
product candidates;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the timing, receipt and amount of sales revenues and associated royalties to us, if any, from our product candidates in the market; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the costs of preparing, filing, prosecuting, maintaining and enforcing patent claims and other patent-related costs, including litigation costs and technology license fees.
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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We expect to seek additional funding through public or private financings and may seek additional funding
for programs that are not currently licensed to collaborators, from new strategic collaborators. However, the biotechnology market in general, and the market for our common stock, in particular, is highly volatile. Due to market conditions and the
status of our development pipeline, additional funding may not be available to us on acceptable terms, if at all. If we fail to obtain such additional financing on a timely basis, our ability to continue all of our research and development,
activities will be adversely affected.



If we raise additional
funds by issuing equity securities, dilution to our stockholders will result. In addition, the terms of such a financing may adversely affect other rights of our stockholders. We also could elect to seek funds through arrangements with collaborators
or others that may require us to relinquish rights to certain technologies, product candidates or products.



If the estimates we make and the assumptions on which we rely in preparing our financial statements prove inaccurate, our actual results may vary significantly.



Our financial statements have been prepared in accordance with accounting
principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of our assets, liabilities, revenues and expenses, the amounts of charges
taken by us and related disclosure. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. We cannot assure you that our estimates, or the assumptions underlying
them, will be correct. Accordingly, our actual financial results may vary significantly from the estimates contained in our financial statements.



RISKS RELATING TO OUR COLLABORATIONS



We are dependent on collaborators for the development and commercialization of many of our product candidates and for a significant portion of our revenue. If we lose
any of these collaborators, of if they fail or delay in developing or commercializing our product candidates, our anticipated product pipeline and operating results would suffer.



The success of our strategy for development and commercialization of product candidates depends upon our ability to form and
maintain productive strategic collaborations. We currently have strategic collaborations with Genentech, Ortho Biotech Products, and Wyeth. $1.9 million and $3.1 million, or 76% and 85%, respectively, of our gross revenue for the first quarter of
2005 and for the year ended December 31, 2004 were derived from licensing and research and development payments paid to us by these collaborators. We expect to enter into additional collaborations in the future. Our existing and any future
collaborations may not be scientifically or commercially successful.



The risks that we face in connection with these collaborations include the following:



| |  |  | Each of our collaborators has significant discretion in determining the efforts and resources that they will apply to the collaboration. The timing and amount of any future royalty
and milestone revenue that we may receive under such collaborative arrangements will depend on, among other things, such collaborators efforts and allocation of resources.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | All of our strategic collaboration agreements are for fixed terms and are subject to termination under various circumstances, including in some cases, on short notice without cause.
If any collaborator were to terminate an agreement, we may be required to undertake product development, manufacturing and commercialization and we may not have the funds or capability to do this, which could result in a discontinuation of such
program.
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | Our collaborators may develop and commercialize, either alone or with others, products and services that are similar to or competitive with the products and services that are the
subject of the collaboration with us.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| |  |  | Our collaborators may change the focus of their development and commercialization efforts or pursue higher-priority programs. The ability of certain of our product candidates to
reach their potential could be limited if our collaborators decrease or fail to increase spending related to such product candidates.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



We may not be successful in establishing additional strategic collaborations, which could adversely affect our ability to develop and commercialize products.



As an integral part of our ongoing research and
development efforts, we periodically review opportunities to establish new collaborations, joint ventures and strategic collaborations for the development and commercialization of products in our development pipeline. We face significant competition
in seeking appropriate collaborators and the negotiation process is time-consuming and complex. We may not be successful in our efforts to establish additional strategic collaborations or other alternative arrangements. Even if we are successful in
our efforts to establish a collaboration or agreement, the terms that we establish may not be favorable to us. Finally, such strategic alliances or other arrangements may not result in successful products and associated revenue.



RISKS RELATED TO OUR BUSINESS, INDUSTRY, STRATEGY AND OPERATIONS



We face substantial competition, which may result in our competitors
discovering, developing or commercializing products before or more successfully than we do.



Our product candidates face competition with existing and new products being developed by biotechnology, medical device and pharmaceutical companies, as
well as universities and other research institutions. For example, research in the fields of regulatory signaling pathways and functional genomics, which includes our work with Genentech in the field of cancer, with Ortho Biotech Products in the
field of renal disease, and with Wyeth in the field of neurology, is highly competitive. A number of entities are seeking to identify and patent randomly sequenced genes and gene fragments, typically without specific knowledge of the function that
such genes or gene fragments perform. Our competitors may discover, characterize and develop important inducing molecules or genes in advance of us. We also face competition from these and other entities in gaining access to DNA samples used in our
research and development projects. Many of our competitors have substantially greater capital resources, research and development staffs and facilities than we have. Efforts by other biotechnology, medical device and pharmaceutical companies could
render our programs or products uneconomical or result in therapies superior to those that we develop alone or with a collaborator. For those programs that we have selected for further internal development, we face competition from companies that
are more experienced in product development and commercialization, obtaining regulatory approvals and product manufacturing. As a result, they may develop competing products more rapidly and at a lower cost. For those programs that are subject to a
collaboration agreement, competitors may discover, develop and commercialize products which render our products non-competitive or obsolete. We expect competition to intensify in genomics research and regulatory signaling pathways as technical
advances in the field are made and become more widely known.



Since our
technologies have many potential applications and we have limited resources, our election to focus on a particular application may result in our failure to capitalize on other potentially profitable applications of our technologies.



We have limited financial and managerial resources. These limitations
require us to focus on a select group of product candidates in specific therapeutic areas and to forego the exploration of other product opportunities. While our technologies may permit us to work in multiple areas, resource commitments may require
trade-offs resulting in delays in the development of certain programs or research areas, which may place us at a competitive disadvantage. Our decisions as to resource allocation may not lead to the development of viable commercial products and may
divert resources away from other market opportunities which ultimately prove to be more profitable.



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If we or our collaborators fail to achieve market acceptance for our products under development, our future revenue
and ability to achieve profitability may be adversely affected.



Our future products, if any are successfully developed, may not gain commercial acceptance among physicians, patients and third-party payors, even if necessary marketing approvals have been obtained. We believe that recommendations and
endorsements by physicians will be essential for market acceptance of any products we successfully develop. If we are not able to obtain a positive reception for such products, our expected revenues from sales of these products would be adversely
affected.



We could be exposed to significant risk from liability claims if
we are unable to obtain insurance at acceptable costs or otherwise protect ourselves against potential product liability claims.



Product liability claims, inherent in the process of researching and developing human health care products, could expose us to significant liabilities and
prevent or interfere with the development or commercialization of our product candidates. Product liability claims would require us to spend significant time, money and other resources to defend such claims and could ultimately lead to our having to
pay a significant damage award. Product liability insurance is expensive to procure for biopharmaceutical companies such as ours. Although we maintain product liability insurance coverage for the clinical trials of our products under development, it
is possible that we will not be able to obtain additional product liability insurance on acceptable terms, if at all, and that our product liability insurance coverage will not prove to be adequate to protect us from all potential claims.



If we are not able to attract and retain key management and scientific
personnel and advisors, we may not successfully develop our product candidates or achieve our other business objectives.



We highly depend upon our senior management and scientific staff. The loss of the service of any of the key members of our senior management may
significantly delay or prevent the achievement of product development and other business objectives. Key members of our senior management team include Daniel R. Passeri, our president and chief executive officer and Dr. Lee L. Rubin, our senior vice
president and chief scientific officer. Our executive officers, including these individuals, can terminate their employment with us at any time. The loss of the services of any of our executive officers may significantly delay or prevent the
achievement of product research and development and other business objectives. We are not aware of any present intention of any of these individuals to leave our company. Replacing key employees may be difficult and may take an extended period of
time because of the limited number of individuals in our industry with the breadth of skills and experience required to research, develop and successfully commercialize products in our areas of core competency. We do not maintain key man life
insurance on any of these executive officers.



Our ability to
operate successfully will depend on our ability to attract and retain qualified personnel, consultants and advisors. We face intense competition for qualified individuals from numerous pharmaceutical and biotechnology companies, universities,
governmental entities and other research institutions. We may be unable to attract and retain these individuals, and our failure to do so would have an adverse effect on our business.



If we make any acquisitions, we will incur a variety of costs and may never successfully integrate the acquired business into ours.



We may attempt to acquire businesses, technologies,
services or products that we believe are a strategic complement to our business model. We may encounter operating difficulties and expenditures relating to integrating an acquired business, technology, service or product. These acquisitions may also
absorb significant management attention that would otherwise be available for ongoing development of our business. Moreover, we may never realize the anticipated benefits of any acquisition. We may also make dilutive issuances of equity securities,
incur debt, experience a decrease in the cash available for our operations, or incur contingent liabilities in connection with any future acquisitions.



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RISKS RELATING TO INTELLECTUAL PROPERTY



If we breach any of the agreements under which we license or have acquired intellectual
property from others, we could lose intellectual property rights that are important to our business.



We are a party to intellectual property licenses and agreements that are important to our business and expect to enter into similar licenses and
agreements in the future. These licenses and agreements impose various research, development, commercialization, sublicensing, royalty, indemnification, insurance and other obligations on us. If we or our collaborators fail to perform under these
agreements or otherwise breach obligations thereunder, we could lose intellectual property rights that are important to our business.



We may not be able to obtain patent protection for our discoveries and our technologies may be found to infringe patent rights of third parties.



The patent positions of pharmaceutical and biotechnology companies,
including ours, are generally uncertain and involve complex legal, scientific and factual questions.



The long-term success of our enterprise depends in significant part on our ability to:



| |  |  | obtain patents to protect our discoveries;
| | - |  | ------------------------------------------



| |  |  | protect trade secrets from disclosure to third-party competitors;
| | - |  | -----------------------------------------------------------------



| |  |  | operate without infringing upon the proprietary rights of others; and
| | - |  | ---------------------------------------------------------------------



| |  |  | prevent others from infringing on our proprietary rights.
| | - |  | ---------------------------------------------------------



Patents may not issue from any of the patent applications that we own or license. If patents do issue, the allowed claims may not be sufficiently broad to
protect our technology from exploitation by our competitors. In addition, issued patents that we own or license may be challenged, invalidated or circumvented. Our patents also may not afford us protection against competitors with similar
technology. Because patent applications in the United States are maintained in secrecy until 18 months after filing, it is possible that third parties have filed or maintained patent applications for technology used by us or covered by our pending
patent applications without our knowledge.



We may not have
rights under patents which may cover one or more of our product candidates. In some cases, these patents may be owned or controlled by third party competitors and may impair our ability to exploit our technology. As a result, we or our collaborative
partners may be required to obtain licenses under third-party patents to develop and commercialize some of our product candidates. If we are unable to secure licenses to such patented technology on acceptable terms, we or our collaborative partners
will not be able to develop and commercialize the affected product candidate or candidates.



If we are unable to keep our trade secrets confidential, our technology and proprietary information may be used by others to compete against us.



We rely significantly upon proprietary technology, information, processes and know-how that is not subject to patent
protection. We seek to protect this information through confidentiality agreements with our employees, consultants and other third-party contractors as well as through other security measures. These confidentiality agreements and security measures
may be breached, and we may not have adequate remedies for any such breach. In addition, our trade secrets may otherwise become known or be independently developed by competitors.



We may become involved in expensive patent litigation or other intellectual property proceedings which could result in liability for
damages or stop our development and commercialization efforts.



There have been substantial litigation and other proceedings regarding patent and other intellectual property rights in the pharmaceutical and biotechnology industries. We may become a party to patent litigation or other proceedings
regarding intellectual property rights.



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Situations which may give rise to patent litigation or other disputes over the use of our intellectual
property include:



| |  |  | initiation of litigation or other proceedings against third parties to enforce our patent rights;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation or other proceedings against third parties to seek to invalidate the patents held by these third parties or to obtain a judgment that our product candidates
do not infringe the third parties patents;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | participation in interference or opposition proceedings to determine the priority of invention if our competitors file patent applications that claim technology also claimed by us;
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation by third parties claiming that our processes or product candidates or the intended use of our product candidates infringe their patent or other intellectual
property rights; and
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | initiation of litigation by us or third parties seeking to enforce contract rights relating to intellectual property which may be important to our business.
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------



The costs associated with any patent litigation
or other proceeding, even if resolved favorably, will likely be substantial. Some of our competitors may be able to sustain the cost of such litigation or other proceedings more effectively than we can because of their substantially greater
financial resources. If a patent litigation or other intellectual property proceeding is resolved unfavorably, we or our collaborative partners may be enjoined from manufacturing or selling our products and services without a license from the other
party and be held liable for significant damages. Moreover, we may not be able to obtain required licenses on commercially acceptable terms or any terms at all. In addition, we could be held liable for lost profits if we are found to have infringed
a valid patent, or liable for treble damages if we are found to have willfully infringed a valid patent. Litigation results are highly unpredictable and we or our collaborative partners may not prevail in any patent litigation or other proceeding in
which we may become involved.



Uncertainties resulting from the
initiation and continuation of patent litigation or other proceedings could damage our ability to compete in the marketplace. Patent litigation and other proceedings may also absorb significant management time and expense.



If licensees or assignees of our intellectual property rights breach any of the agreements
under which we have licensed or assigned our intellectual property to them, we could be deprived of important intellectual property rights and future revenue.



We are a party to intellectual property out-licenses, collaborations and agreements that are important to our business and
expect to enter into similar agreements with third parties in the future. Under these agreements, we license or transfer intellectual property to third parties and impose various research, development, commercialization, sublicensing, royalty,
indemnification, insurance, and other obligations on them. If a third party fails to comply with these requirements, we generally retain the right to terminate the agreement, and to bring a legal action in court or in arbitration. In the event of
breach, we may need to enforce our rights under these agreements by resorting to arbitration or litigation. During the period of arbitration or litigation, we may be unable to effectively use, assign or license the relevant intellectual property
rights and may be deprived of current or future revenues that are associated with such intellectual property.



RISKS RELATING TO CLINICAL AND REGULATORY MATTERS



We expect to rely heavily on third parties for the conduct of clinical trials of our product candidates. If these clinical trials are not successful, or if we or our collaborators are not able to obtain the
necessary regulatory approvals, we will not be able to commercialize our product candidates.



In order to obtain regulatory approval for the commercial sale of our product candidates, we and our collaborators will be required to complete extensive
preclinical studies as well as clinical trials in humans to



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demonstrate to the FDA and foreign regulatory authorities that our product candidates are safe and effective. We have limited experience in conducting
clinical trials and expect to rely primarily on collaborative partners and contract research organizations for their performance and management of clinical trials of our product candidates.



Clinical development, including preclinical testing, is a long, expensive and
uncertain process. Accordingly, preclinical testing and clinical trials, if any, of our product candidates under development may not be successful. We and our collaborators could experience delays in preclinical or clinical trials of any of our
product candidates, obtain unfavorable results in a development program, or fail to obtain regulatory approval for the commercialization of a product. Preclinical studies or clinical trials may produce negative, inconsistent or inconclusive results,
and we or our collaborators may decide, or regulators may require us, to conduct additional preclinical studies or clinical trials. The results from early clinical trials may not be statistically significant or predictive of results that will be
obtained from expanded, advanced clinical trials. Furthermore, the timing and completion of clinical trials, if any, of our product candidates depend on, among other factors, the number of patients we will be required to enroll in the clinical
trials and the rate at which those patients are enrolled. Any increase in the required number of patients, decrease in recruitment rates or difficulties retaining study participants may result in increased costs, program delays or both. Also, our
products under development may not be effective in treating any of our targeted disorders or may prove to have undesirable or unintended side effects, toxicities or other characteristics that may prevent or limit their commercial use. Institutional
review boards or regulators, including the FDA, may hold, suspend or terminate our clinical research or the clinical trials of our product candidates for various reasons, including noncompliance with regulatory requirements or if, in their opinion,
the participating subjects are being exposed to unacceptable health risks. Additionally, the failure of third parties conducting or overseeing the operation of the clinical trials to perform their contractual or regulatory obligations in a timely
fashion could delay the clinical trials. Failure of clinical trials can occur at any stage of testing. Any of these events would adversely affect our ability to market a product candidate.



The development process necessary to obtain regulatory approval is lengthy, complex and
expensive. If we and our collaborative partners do not obtain necessary regulatory approvals, then our business will be unsuccessful and the market price of our common stock will substantially decline.



To the extent that we, or our collaborative partners, are able to
successfully advance a product candidate through the clinic, we, or such partner, will be required to obtain regulatory approval prior to marketing and selling such product.



The process of obtaining FDA and other required regulatory approvals is expensive. The time required for FDA and other
approvals is uncertain and typically takes a number of years, depending on the complexity and novelty of the product. The process of obtaining FDA and other required regulatory approvals for many of our products under development is further
complicated because some of these products use non-traditional or novel materials in non-traditional or novel ways, and the regulatory officials have little precedent to follow. With respect to internal programs to date, we have limited experience
in filing and prosecuting applications to obtain marketing approval.



Any regulatory approval to market a product may be subject to limitations on the indicated uses for which we, or our collaborative partners, may market the product. These limitations may restrict the size of the market for the product and
affect reimbursement by third-party payors. In addition, regulatory agencies may not grant approvals on a timely basis or may revoke or significantly modify previously granted approvals.



We, or our collaborative partners, also are subject to numerous foreign regulatory requirements governing the manufacturing
and marketing of our potential future products outside of the United States. The approval procedure varies among countries, additional testing may be required in some jurisdictions, and the time required to obtain foreign approvals often differs
from that required to obtain FDA approvals. Moreover, approval by the FDA does not ensure approval by regulatory authorities in other countries, and vice versa.



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As a result of these factors, we or our collaborators may not successfully begin or complete clinical
trials in the time periods estimated, if at all. Moreover, if we or our collaborators incur costs and delays in development programs or fail to successfully develop and commercialize products based upon our technologies, we may not become profitable
and our stock price could decline.



Even if marketing approval is obtained,
any products we or our collaborators develop will be subject to ongoing regulatory oversight which may affect the successful commercialization of such products.



Even if regulatory approval of a product candidate is obtained by us or our collaborators, the approval may be subject to
limitations on the indicated uses for which the product is marketed or require costly post-marketing follow-up studies. After marketing approval for any product is obtained, the manufacturer and the manufacturing facilities for that product will be
subject to continual review and periodic inspections by the FDA and other regulatory agencies. The subsequent discovery of previously unknown problems with the product, or with the manufacturer or facility, may result in restrictions on the product
or manufacturer, including withdrawal of the product from the market.



If there is a failure to comply with applicable regulatory requirements, we or our collaborator may be subject to fines, suspension or withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions, and
criminal prosecution.



We, and our collaborators, are subject to
governmental regulations other than those imposed by the FDA. We, and any of our collaborators, may not be able to comply with these regulations, which could subject us, or such collaborators, to penalties and otherwise result in the limitation of
our or such collaborators operations.



In addition
to regulations imposed by the FDA, we and our collaborators are subject to regulation under the Occupational Safety and Health Act, the Environmental Protection Act, the Toxic Substances Control Act, the Research Conservation and Recovery Act, as
well as regulations administered by the Nuclear Regulatory Commission, national restrictions on technology transfer, import, export and customs regulations and certain other local, state or federal regulations. From time to time, other federal
agencies and congressional committees have indicated an interest in implementing further regulation of biotechnology applications. We are not able to predict whether any such regulations will be adopted or whether, if adopted, such regulations will
apply to our business, or whether we or our collaborators would be able to comply with any applicable regulations.



Our research and development activities involve the controlled use of hazardous materials and chemicals. Although we believe that our safety procedures
for handling and disposing of such materials comply with all applicable laws and regulations, we cannot completely eliminate the risk of accidental contamination or injury caused by these materials.



RISKS RELATING TO PRODUCT MANUFACTURING AND SALES



We will depend on our collaborators and third-party manufacturers to produce most, if not
all, of our products under development, and if these third parties do not successfully manufacture these products our business will be harmed.



We have no manufacturing experience or manufacturing capabilities. In order to continue to develop products, apply for regulatory approvals, and
commercialize our products, we or our collaborators must be able to manufacture products in clinical and commercial quantities, in compliance with regulatory requirements, at acceptable costs and in a timely manner. The manufacture of our product
candidates may be complex, difficult to accomplish and difficult to scale-up when large-scale production is required. Manufacture may be subject to delays, inefficiencies and poor or low yields of quality products. The cost of manufacturing some of
our products may make them prohibitively expensive. If supplies of any of our product candidates or related materials become unavailable on a timely basis or at all or are contaminated or otherwise lost, clinical trials by us and our collaborators
could be seriously delayed. This is due to the fact that such materials are time-consuming to manufacture and cannot be readily obtained from third-party sources.



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To the extent that we, or our collaborators, seek to enter into manufacturing arrangements with third
parties, we and such collaborators will depend upon these third parties to perform their obligations in a timely and effective manner and in accordance with government regulations. Contract manufacturers may breach their manufacturing agreements
because of factors beyond our control or may terminate or fail to renew a manufacturing agreement based on their own business priorities at a time that is costly or inconvenient for us. Contract manufacturers are subject to ongoing periodic,
unannounced inspection by the FDA and corresponding state and foreign agencies or their designees to ensure strict compliance with current good manufacturing practices and other governmental regulations and corresponding foreign standards. Failure
of contract manufacturers or our collaborators or us to comply with applicable regulations could result in sanctions being imposed, including fines, injunctions, civil penalties, failure of regulatory authorities to grant marketing approval of our
product candidates, delays, suspension or withdrawal of approvals, seizures or recalls of product candidates, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect our business. If we need to change
manufacturers, the FDA and corresponding foreign regulatory agencies must approve these manufacturers in advance. This would involve testing and pre-approval inspections to ensure compliance with FDA and foreign regulations and standards. If
third-party manufacturers fail to perform their obligations, our competitive position and ability to generate revenue may be adversely affected in a number of ways, including;



| |  |  | we and our collaborators may not be able to initiate or continue clinical trials of products that are under development;
| | - |  | ------------------------------------------------------------------------------------------------------------------------



| |  |  | we and our collaborators may be delayed in submitting applications for regulatory approvals for our product candidates; and
| | - |  | ---------------------------------------------------------------------------------------------------------------------------



| |  |  | we and our collaborators may not be able to meet commercial demands for any approved products.
| | - |  | ----------------------------------------------------------------------------------------------



We have no sales or marketing experience and, as such, will depend significantly on third parties who may not successfully sell our
products.



We have no sales, marketing or product
distribution experience. If we receive required regulatory approvals, we plan to rely primarily on sales, marketing and distribution arrangements with third parties, including our collaborative partners. For example, as part of our agreements with
Genentech, Ortho Biotech Products and Wyeth, we have granted our collaborators exclusive rights to distribute certain products resulting from such collaborations, if any are ever successfully developed. We may have to enter into additional marketing
arrangements in the future and we may not be able to enter into these additional arrangements on terms which are favorable to us, if at all. In addition, we may have limited or no control over the sales, marketing and distribution activities of
these third parties and sales through these third parties could be less profitable to us than direct sales. These third parties could sell competing products and may devote insufficient sales efforts to our products. Our future revenues will be
materially dependent upon the success of the efforts of these third parties.



We may seek to independently market products that are not already subject to marketing agreements with other parties. If we determine to perform sales, marketing and distribution functions ourselves, we could face a
number of additional risks, including:



| |  |  | we may not be able to attract and build a significant and skilled marketing staff or sales force;
| | - |  | -------------------------------------------------------------------------------------------------



| |  |  | the cost of establishing a marketing staff or sales force may not be justifiable in light of the revenues generated by any particular product; and
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------------



| |  |  | our direct sales and marketing efforts may not be successful.
| | - |  | -------------------------------------------------------------



RISKS RELATED TO OUR COMMON STOCK



Our stock price will fluctuate significantly and the market price of our common stock could drop below the price you paid.



The trading price of our common stock has been volatile and may continue to
be volatile in the future. For example, our stock has traded as high as $6.59 and as low as $2.46 per share for the period January 1, 2004



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through March 31, 2005. The stock market, particularly in recent years, has experienced significant volatility with respect to biopharmaceutical- and
biotechnology-based company stocks. The volatility of biopharmaceutical- and biotechnology-based company stocks often does not relate to the operating performance of the companies represented by the stock. Prices for our stock will be determined in
the market place and may be influenced by many factors, including:



| |  |  | announcements regarding new technologies by us or our competitors;
| | - |  | ------------------------------------------------------------------



| |  |  | market conditions in the biotechnology and pharmaceutical sectors;
| | - |  | ------------------------------------------------------------------



| |  |  | rumors relating to us or our competitors;
| | - |  | -----------------------------------------



| |  |  | litigation or public concern about the safety of our potential products;
| | - |  | ------------------------------------------------------------------------



| |  |  | actual or anticipated variations in our quarterly operating results;
| | - |  | --------------------------------------------------------------------



| |  |  | deviations in our operating results from the estimates of securities analysts;
| | - |  | ------------------------------------------------------------------------------



| |  |  | adverse results or delays in clinical trials being conducted by us or our collaborators;
| | - |  | ----------------------------------------------------------------------------------------



| |  |  | any intellectual property lawsuits involving us;
| | - |  | ------------------------------------------------



| |  |  | sales of large blocks of our common stock;
| | - |  | ------------------------------------------



| |  |  | sales of our common stock by our executive officers, directors or significant stockholders;
| | - |  | -------------------------------------------------------------------------------------------



| |  |  | the loss of any of our key scientific or management personnel;
| | - |  | --------------------------------------------------------------



| |  |  | FDA or international regulatory actions; and
| | - |  | --------------------------------------------



| |  |  | general market conditions.
| | - |  | --------------------------



While we cannot predict the individual effect that these factors may have on the price of our common stock, these factors, either individually or in the
aggregate, could result in significant variations in price during any given period of time. Moreover, in the past, securities class action litigation has often been instituted against companies following periods of volatility in their stock price.
This type of litigation could result in substantial costs and divert our managements attention and resources.



Substantially all of our outstanding common stock may be sold into the market at any time. This could cause the market price of our common stock to drop significantly.



Sales of a substantial number of shares of our common
stock in the public market could occur at any time. These sales, or the perception in the market that the holders of a large number of shares intend to sell shares, could reduce the market price of our common stock. As of March 31, 2005, we had
outstanding approximately 47.9 million shares of common stock. Substantially all of these shares may also be resold in the public market at any time. In addition, we have a significant number of shares that are subject to outstanding options. The
exercise of these options and the subsequent sale of the underlying common stock could cause a further decline in our stock price. These sales also might make it difficult for us to sell equity securities in the future at a time and at a price that
we deem appropriate.



We have anti-takeover defenses that could delay or
prevent an acquisition that our stockholders may consider favorable and the market price of our common stock may be lower as a result.



Provisions of our certificate of incorporation, our bylaws and Delaware law may have the effect of deterring unsolicited takeovers or delaying or
preventing changes in control of our management, including transactions in which our stockholders might otherwise receive a premium for their shares over then current market prices. In addition, these provisions may limit the ability of stockholders
to approve transactions that they may deem to be in their best interest. For example, we have divided our board of directors into three classes that serve staggered three-year terms, we may issue shares of our authorized blank check
preferred stock and our stockholders are limited in their ability to call special stockholder meetings.



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In addition, we are subject to the anti-takeover provisions of Section 203 of the Delaware General
Corporation Law, which prohibits a publicly-held Delaware corporation from engaging in a business combination with an interested stockholder, generally a person which together with its affiliates owns, or within the last three years has owned, 15%
of our voting stock, for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. These provisions could discourage, delay or
prevent a change in control transaction.



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PART IIOTHER INFORMATION



Item 6.    EXHIBITS



(a) Exhibits.



See exhibit index.



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SIGNATURE



Pursuant to the
requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.



|                      |  |  |  |             |  |                        |  |                                                                                                                  
|--------------------- |  |  |  | ----------- |  | ---------------------- |  | -----------------------------------------------------------------------------------------------------------------
|                      |  |  |  | CURIS, INC.
|                      |  |  | 
|Dated: March 31, 2006 |  |  |  | By:         |  | /s/    MICHAEL P. GRAY
|                      |  |  |  |             |  |                        |  | Michael P. Gray Vice President of Finance and Chief Financial Officer (Principal Financial and Accounting
Officer



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EXHIBIT INDEX



|              |  |                                                                                                                      
|------------- |  | ---------------------------------------------------------------------------------------------------------------------
|ExhibitNumber |  | Description                                                                                                          
|              | 
|31.1          |  | Certification of the Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act                          
|              | 
|31.2          |  | Certification of the Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act                          
|              | 
|32.1          |  | Certification of the Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and18 U.S.C. Section
1350
|              | 
|32.2          |  | Certification of the Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and18 U.S.C. Section
1350

---

| |  | Confidential treatment has been requested as to certain portions of this exhibit.
|- |  | ---------------------------------------------------------------------------------



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