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COLLABORATION AND LICENSE AGREEMENT

Collaboration Agreement

COLLABORATION AND LICENSE AGREEMENT | Document Parties: TRUBION PHARMACEUTICALS, INC. | WYETH You are currently viewing:
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TRUBION PHARMACEUTICALS, INC. | WYETH

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Title: COLLABORATION AND LICENSE AGREEMENT
Governing Law: Delaware     Date: 6/2/2006

COLLABORATION AND LICENSE AGREEMENT, Parties: trubion pharmaceuticals  inc. , wyeth
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                                                                   REDACTED COPY

                                                                   Exhibit 10.11

                       COLLABORATION AND LICENSE AGREEMENT

                                  by and between

                                      WYETH

                acting through its Wyeth Pharmaceuticals Division

                                       and

                          TRUBION PHARMACEUTICALS, INC.

                                 December 19, 2005

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                                TABLE OF CONTENTS

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1.    DEFINITIONS....................................................................................      1

2.    LICENSES.......................................................................................     16

     2.1.     Licenses to Wyeth......................................................................     16
              2.1.1.   Exclusive Licenses.............................................................     16
             2.1.2.   Retained Rights of Trubion.....................................................     17

     2.2.     License to Trubion.....................................................................     17

     2.3.     Exclusivity............................................................................     17
             2.3.1.   CD20 Product Exclusivity.......................................................     17
             2.3.2. [***]......................................................Error! Bookmark not defined
             2.3.3.   Limitations....................................................................     18

     2.4.     Sublicensing...........................................................................     18

     2.5.     Direct Licenses to Affiliates..........................................................     19

     2.6.     Right of Reference.....................................................................     20

     2.7.     Section 365(n) of Bankruptcy Code......................................................     20

     2.8.     No Implied Rights......................................................................     21

3.    RESEARCH PROGRAM...............................................................................     21

     3.1.     Scope and Conduct of the Research Program..............................................     21

     3.2.     Designation of Targets.................................................................     22
             3.2.1..................................................................................     22
             3.2.2.   Released Targets...............................................................     23
             3.2.3.   Wyeth Targets..................................................................     23
             3.2.4.   Excluded Targets...............................................................     24

     3.3.     Term and Termination of the Research Program...........................................     27
             3.3.1.   Research Term..................................................................     27
             3.3.2.   Termination of Research Program by Wyeth.......................................     27

     3.4.     Joint Research Committee...............................................................     28
             3.4.1.   Composition....................................................................     28
             3.4.2.   Responsibilities...............................................................     28
             3.4.3.   Meetings.......................................................................     28
             3.4.4.   Voting.........................................................................     28
             3.4.5.   Dispute Resolution.............................................................     28
             3.4.6.   Minutes........................................................................     29

     3.5.     Research Plan..........................................................................     29

     3.6.     Funding of the Research Program........................................................     29
              3.6.1.   Research Funding...............................................................     29
             3.6.2.   Reimbursement Payments.........................................................     30
             3.6.3.   Records and Audits.............................................................     30

     3.7.     Data and Deliverables..................................................................     31
</TABLE>


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     3.8.     Alliance Managers......................................................................     32

4.    PRODUCT DEVELOPMENT, MANUFACTURING, COMMERCIALIZATION AND REGULATORY MATTERS...................     32

     4.1.     Product Development....................................................................     32

     4.2.     Transfer of Product Data and Filings...................................................     33

     4.3.     Regulatory Approvals...................................................................     33

     4.4.     Regulatory Reporting...................................................................      34

     4.5.     Progress Reports.......................................................................     34

     4.6.     CD20 Product Development...............................................................     35

     4.7.     Joint Development Committee............................................................     36

     4.8.     Joint Project Team; Development Plan...................................................     37

     4.9.     Manufacturing..........................................................................     37

     4.10.    Commercialization......................................................................     38

     4.11.    Co-Promotion Option....................................................................     38

     4.12.    Co-Promotion Committee.................................................................     39

     4.13.    Co-Branding............................................................................     39

     4.14.    Marking................................................................................     39

5.    CONSIDERATION..................................................................................     39

     5.1.     Initial Research and Development Expense Payment.......................................     39

     5.2.     Equity.................................................................................     39

     5.3.     Additional Research and Development Expense Payments...................................     39

     5.4.     Royalties..............................................................................     40
             5.4.1.   Licensed Product Royalties.....................................................     40
             5.4.2.   CD20 Product Royalties.........................................................     40
             5.4.3.   [***].....................................................Error! Bookmark not defined
             5.4.4.   Other Product Royalties........................................................      45
             5.4.5.   Expiration of Royalty Period...................................................     46
             5.4.6.   Royalty Adjustments............................................................     46

     5.5.     Reports and Payments...................................................................     47
             5.5.1.   Cumulative Royalties...........................................................     47
             5.5.2.   Royalty Statements and Payments................................................     48
             5.5.3.   Taxes and Withholding..........................................................     48
             5.5.4.   Currency.......................................................................     49
             5.5.5.   Additional Provisions Relating to Royalties....................................     49
             5.5.6.   Interest on Past Due Payments..................................................     49

     5.6.     Maintenance of Records; Audits.........................................................     49
             5.6.1.   Record Keeping.................................................................     49
             5.6.2.   Audits.........................................................................     50
             5.6.3.   Underpayments/Overpayments.....................................................     50
             5.6.4.   Confidentiality................................................................     50

6.    INTELLECTUAL PROPERTY..........................................................................     51

     6.1.     Inventions; Joint Patent Committee.....................................................     51
             6.1.1.   Ownership and Inventorship.....................................................     51
             6.1.2.   SMIP Improvements..............................................................     51
</TABLE>


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             6.1.3.   Joint Patent Committee.........................................................     51

     6.2.     Patent Rights..........................................................................     52
             6.2.1.   Filing, Prosecution and Maintenance of Patent Rights...........................     52
             6.2.2.   Enforcement of Patent Rights...................................................     56
             6.2.3.   Infringement and Third Party Licenses..........................................     59
             6.2.4.   Patent Certifications..........................................................     61
             6.2.5.   Patent Term Restoration........................................................     61

     6.3.     Trademarks.............................................................................     61

7.    CONFIDENTIALITY................................................................................     61

     7.1.     Confidentiality........................................................................     62

     7.2.     Authorized Disclosure and Use..........................................................     62
             7.2.1.   Disclosure.....................................................................     62
             7.2.2.   Use............................................................................     63

     7.3.     SEC Filings............................................................................     63

     7.4.     Public Announcements; Publications.....................................................     64
             7.4.1.   Coordination...................................................................     64
             7.4.2.   Announcements..................................................................     64
             7.4.3.   Publications...................................................................     64

8.    REPRESENTATIONS AND WARRANTIES.................................................................     65

     8.1.     Representations and Warranties of Each Party...........................................     66

     8.2.     Additional Representations and Warranties of Trubion...................................     67

     8.3.     Mutual Covenant........................................................................     67

     8.4.     Additional Covenants of Trubion........................................................     67

     8.5.     Representation by Legal Counsel........................................................     67

     8.6.     No Inconsistent Agreements.............................................................     67

     8.7.     Disclaimer.............................................................................     67

9.    GOVERNMENT APPROVALS; TERM AND TERMINATION.....................................................     68

     9.1.     HSR Filing.............................................................................     68

     9.2.     Other Government Approvals.............................................................     68

     9.3.     Term...................................................................................      68

     9.4.     Termination Upon HSR Denial............................................................     68

     9.5.     Material Breach........................................................................     68

     9.6.     Termination by Wyeth...................................................................     69
             9.6.1.   Termination Without Cause......................................................     70
             9.6.2.   Termination for a Material Safety or Regulatory Issue..........................     70

     9.7.     Effects of Termination.................................................................     70
             9.7.1.   Effect of Termination by Wyeth for Cause.......................................     70
              9.7.2.   Effect of Termination by Trubion for Cause.....................................     71
             9.7.3.   Effect of Termination by Wyeth Without Cause...................................     71
             9.7.4.   Effect of Termination by Wyeth for a Material Safety or Regulatory Issue.......     72
             9.7.5.   Post-Termination Rights to Wyeth Technology and Trubion Technology.............     72
             9.7.6.   Post-Termination Licenses to Wyeth Technology..................................     72
</TABLE>


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             9.7.7.   Post-Termination Transfer of Product Data and Filings and Existing Trademarks..     72
             9.7.8.   Manufacturing of Licensed Products After Termination...........................     73
             9.7.9.   Post-Termination Disposition of Inventories of Licensed Products...............     74
             9.7.10. Continuation of Rights and Licenses Under Sections 6.1.1 and 6.1.2.............     74
             9.7.11. Continuation of Other Rights and Obligations...................................     74

      9.8.     [***].............................................................Error! Bookmark not defined

     9.9.     Survival of Certain Obligations........................................................     74

     9.10.    Change of Control......................................................................     75
             9.10.1. Definition.....................................................................     75
             9.10.2. Change of Control of Wyeth.....................................................     76
             9.10.3. Change of Control of Trubion...................................................     78

10.   INDEMNIFICATION AND INSURANCE..................................................................     78

     10.1.    Indemnification by Wyeth...............................................................     78

     10.2.    Indemnification by Trubion.............................................................     78

     10.3.    Procedure..............................................................................     79

     10.4.    Insurance..............................................................................     80

11.   DISPUTE RESOLUTION.............................................................................     80

     11.1.    General................................................................................     80

     11.2.    Failure of Executive Officers to Resolve Dispute.......................................     80

     11.3.    Disclaimer of Consequential and Punitive Damages.......................................     80

12.   MISCELLANEOUS..................................................................................     80

     12.1.    Periodic Executive Meetings............................................................     80

     12.2.    Assignment.............................................................................     81

     12.3.    Further Actions........................................................................     81

     12.4.    Force Majeure..........................................................................     81

     12.5.    Non-Solicitation.......................................................................     82

     12.6.    Correspondence and Notices.............................................................     82
             12.6.1. Ordinary Notices...............................................................     82
             12.6.2. Extraordinary Notices..........................................................     82

     12.7.    Amendment..............................................................................     83

     12.8.    Waiver.................................................................................     83

     12.9.    Severability...........................................................................     84

     12.10.   Descriptive Headings...................................................................     84

     12.11.   Governing Law..........................................................................     84

     12.12.   Entire Agreement of the Parties........................................................     84

     12.13.   Independent Contractors................................................................     84

     12.14.   Counterparts...........................................................................     84
</TABLE>


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                                     EXHIBITS

Exhibit 1.122 - TRU-015

Exhibit 1.129 - Trubion Patent Rights

Exhibit 1.132 - Trubion Third Party Agreements

Exhibit 3.2.1 - Trubion's "Milestone One"

Exhibit 3.2.4 - Excluded Targets

Exhibit 4.4 - Adverse Event Reporting Procedures

Exhibit 5.2A - Stock Purchase Agreement

Exhibit 5.2B - Amendment to Investor Rights Agreement

Exhibit 5.3 - Additional Research and Development Expense Payments

Exhibit 8.2(d) - Third Party Rights

Exhibit 8.2(e) - Government Funding Agreements


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                                                                   REDACTED COPY

                       COLLABORATION AND LICENSE AGREEMENT

     This Collaboration and License Agreement (the "Agreement") is entered into
as of December 19, 2005 (the "Signing Date"), by and between Wyeth, together
with its Affiliates (as defined below), acting through its Wyeth Pharmaceuticals
Division, a corporation organized and existing under the laws of the State of
Delaware and having a place of business at 500 Arcola Road, Collegeville,
Pennsylvania 19426 (collectively, "Wyeth") and Trubion Pharmaceuticals, Inc.,
together with its Affiliates (as defined below), a corporation organized and
existing under the laws of the State of Delaware and having a principal place of
business at 2401 4th Avenue, Suite 1050, Seattle, Washington 98121
(collectively, "Trubion"). Wyeth and Trubion may each be referred to herein
individually as a "Party" and collectively as the "Parties".

     WHEREAS, Wyeth is engaged in the research, development and
commercialization of pharmaceutical and health care products;


     WHEREAS, as of the Signing Date, Trubion has developed certain SMIPs (as
defined below) and CD20 Products (as defined below), as well as certain Patent
Rights (as defined below) and Know-How (as defined below) pertaining to
Trubion's SMIP technology platform;

     WHEREAS, Wyeth and Trubion desire to collaborate to discover, research and
develop, and Wyeth desires to research, develop, manufacture and commercialize,
Licensed Products (as defined below) as provided herein; and

     WHEREAS, Wyeth desires to obtain from Trubion, and Trubion desires to grant
to Wyeth, certain exclusive rights so that Wyeth may develop, manufacture and
commercialize such Licensed Products, as provided herein.

     NOW THEREFORE, in consideration of the mutual promises and covenants set
forth below and other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the Parties hereby agree as
follows:

1.    DEFINITIONS.

     1.1. "ADDITIONAL RESEARCH AND DEVELOPMENT EXPENSE PAYMENT" shall have the
          meaning set forth in Section 5.3 hereof.

     1.2. "ADDITIONAL THIRD PARTY LICENSES" shall have the meaning set forth in
          Section 6.2.3(a) hereof.

     1.3. "AFFILIATE(S)" shall mean, with respect to any Person, any other
          Person which controls, is controlled by or is under common control
          with such Person. A Person shall be regarded as in control of another
          entity if it owns

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          or controls at least fifty percent (50%) of the equity securities of
          the subject entity entitled to vote in the election of directors (or,
           in the case of an entity that is not a corporation, for the election
          of the corresponding managing authority); provided, however, that the
          term "Affiliate" shall not include subsidiaries or other entities in
          which a Party or its Affiliates owns a majority of the ordinary voting
          power necessary to elect a majority of the board of directors or other
          governing board, but is restricted from electing such majority by
          contract or otherwise, until such time as such restrictions are no
          longer in effect.

     1.4. "AGREEMENT" shall have the meaning set forth in the preamble hereof.

     1.5. "BANKRUPTCY CODE" shall have the meaning set forth in Section 2.7
          hereof.

     1.6. "BLA" shall have the meaning set forth in Section 1.100 hereof.

     1.7. "CALENDAR QUARTER" shall mean the respective periods of three (3)
          consecutive calendar months ending on March 31, June 30, September 30
          or December 31, for so long as this Agreement is in effect.

     1.8. "CATEGORY 1 COVERED SMIP IMPROVEMENT" shall have the meaning set forth
          in Section 6.1.3(b) hereof.

     1.9. "CATEGORY 2 COVERED SMIP IMPROVEMENT" shall have the meaning set forth
          in Section 6.1.3(b) hereof.

     1.10. "CD20 ANTIGEN" shall mean the human protein antigen that is known as
          CD20, and identified as a full length CD20 protein antigen in GenBank,
          and identified by [***] or [***], and any other protein that [***] as
           the foregoing.

     1.11. "CD20 EFFECTIVE ROYALTY RATE" shall have the meaning set forth in
          Section 5.4.2(a) hereof.

     1.12. "CD20 PRODUCT" shall mean any TRU-015 Product and/or Follow-On CD20
          Product (as the context requires).

     1.13. "CELL LINES" shall mean the cell lines and any other expression
          systems that produce or express any SMIP.

     1.14. "CHANGE OF CONTROL" shall have the meaning set forth in Section
          9.10.1 hereof.

     1.15. "CLINICAL STUDY SUPPLIES" shall have the meaning set forth in Section
          4.9 hereof.


                                                                               2

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     1.16. "COMBINATION PRODUCT" shall mean any product containing as active
           ingredients both (a) a Product and (b) one or more other
          pharmaceutically active compounds or substances.

     1.17. "COMBINATION SALE" shall have the meaning set forth in Section 1.76
          hereof.

     1.18. "COMMERCIALIZATION" OR "COMMERCIALIZE" shall mean activities directed
          to marketing, promoting, distributing, importing or selling a product.
          Commercialization shall not include any activities related to
          Manufacturing or Development.

     1.19. "COMMERCIALLY REASONABLE EFFORTS" shall mean, with respect to the
          efforts to be expended by any Party with respect to any objective,
          those reasonable, diligent, good faith efforts to accomplish such
          objective as such Party would normally use to accomplish a similar
          objective under similar circumstances. With respect to any objective
          relating to the Development and/or Commercialization of a Licensed
          Product by any Party, "COMMERCIALLY REASONABLE EFFORTS" shall mean
          those efforts and resources normally used by such Party with respect
          to a product owned or controlled by such Party, or to which such Party
          has similar rights, which product is of similar market potential and
           is at a similar stage in its development or life as is such Licensed
          Product, taking into account issues of safety, efficacy, product
          profile, the competitiveness of the marketplace, the proprietary
          position of the Licensed Product, the regulatory structure involved,
          profitability of the Licensed Product and other relevant commercial
          factors. A "COMMERCIALLY REASONABLE" action or decision of a Party
          refers in this Agreement to an action or decision taken or made by
          such Party using its Commercially Reasonable Efforts.

     1.20. "CONFIDENTIAL INFORMATION" of a Party shall mean all Know-How or
          other information, including, without limitation, proprietary
          information and materials (whether or not patentable) regarding such
          Party's technology, products, business information or objectives, that
          is communicated in any way or form by the Disclosing Party to the
          Receiving Party, either prior to or after the Effective Date of this
          Agreement, and whether or not such Know-How or other information is
          identified as confidential at the time of disclosure; provided that,
          information not identified as confidential by the Disclosing Party
          shall be deemed to be Confidential Information of the Disclosing Party
          if the Receiving Party knows, or should have had a reasonable
          expectation, that the information communicated by the Disclosing Party
           is Confidential Information of the Disclosing Party. The terms and
          conditions of this Agreement shall be considered Confidential
          Information of both Parties.


                                                                                3

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     1.21. "CONJUGATE(S)" shall mean SMIP(s) fused genetically or linked, either
          directly or through a linker molecule, with any biological,
          cytostatic, cytotoxic or radioactive agent.

     1.22. "CONTROL" OR "CONTROLLED" shall mean with respect to any (a) item of
          information, including, without limitation, Know-How, or (b)
          intellectual property right, the possession (whether by ownership or
          license, other than pursuant to this Agreement) by a Party of the
          ability to grant to the other Party a license or to extend other
          rights as provided herein, under such item or right without violating
          the terms of any agreement or other arrangements with any Third Party.

     1.23. "CO-PROMOTION" shall mean the joint promotion of a CD20 Product in
          the United States by both Parties and/or their respective Affiliates
          under the same CD20 Product Trademark(s). "CO-PROMOTE," when used as a
          verb, shall mean to engage in such Co-Promotion.

     1.24. "CO-PROMOTION PERIOD" shall have the meaning set forth in Section
          4.11 hereof.

     1.25. "COVERED SMIP IMPROVEMENT" shall have the meaning set forth in
          Section 6.1.2 hereof.

     1.26. "DEPOSITED PROTEIN" shall have the meaning set forth in Section 1.45
          hereof.

     1.27. "DESIGNATED TARGET(S)" shall have the meaning set forth in Section
          9.8 hereof.

     1.28. "DEVELOPMENT" OR "DEVELOP" shall mean non-clinical and clinical drug
          development activities pertaining to a product, including, without
          limitation, toxicology, pharmacology, test method development and
          stability testing, process development, formulation development,
          delivery system development, quality assurance and quality control
          development, statistical analysis, clinical studies (including pre-
          and post-approval studies), regulatory affairs, pharmacovigilance and
          Regulatory Approval and clinical study regulatory activities
          (including regulatory activities directed to obtaining pricing and
          reimbursement approvals).

     1.29. "DEVELOPMENT PLAN" shall mean the written plan for the Development of
          CD20 Products described in Section 4.8 hereof.

     1.30. "DISCLOSING PARTY" shall have the meaning set forth in Section 7.1
          hereof.

     1.31. "EFFECTIVE DATE" shall mean the later to occur of (a) the Signing
          Date and (b) the HSR Clearance Date.


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     1.32. "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
          amended.

     1.33. "EXCLUDED TARGET(S)" shall mean the Target(s) described in Section
          3.2.4 hereof as Excluded Target(s).

     1.34. "EXCLUSIVITY COVENANTS" shall have the meaning set forth in Section
          9.10.2(c) hereof.

     1.35. "EXECUTIVE OFFICERS" shall mean the President of Wyeth
          Pharmaceuticals (or an executive officer of Wyeth designated by such
          President of Wyeth Pharmaceuticals) and the Chief Executive Officer of
          Trubion (or an executive officer of Trubion designated by such Chief
          Executive Officer).

     1.36. "EXERCISE NOTICE" shall have the meaning set forth in Section
          9.10.2(c) hereof.

     1.37. "EXISTING ACTIVITIES" shall have the meaning set forth in Section
          9.10.2(c) hereof.

     1.38. "EXISTING TRADEMARKS" shall have the meaning set forth in Section
          9.7.1(a).

     1.39. "FDA" shall mean the United States Food and Drug Administration or
          any successor agency thereto.

     1.40. "FD&C ACT" shall mean the United States Federal Food, Drug, and
          Cosmetic Act (21 U.S.C. Section 301 et seq.), as amended, and the
          rules and regulations promulgated thereunder.

     1.41. "FIRST COMMERCIAL SALE" shall mean, with respect to a given Licensed
          Product and any country in the Territory, the first sale or transfer
          for value of such Licensed Product under this Agreement by Wyeth or
          its sublicensees to a Third Party in such country following receipt of
          marketing authorization from the appropriate Regulatory Authority
           permitting commercial sale of such Licensed Product in such country.

     1.42. "FOLLOW-ON CD20 PRODUCT" shall mean any product containing a
          Follow-On CD20 SMIP.

     1.43. "FOLLOW-ON CD20 SMIP" shall mean any SMIP (other than TRU-015)
           directed against the CD20 Antigen or a portion thereof.

     1.44. "FTE" shall mean a full time equivalent scientific person (M.S. or
          Ph.D. level) year, consisting of a minimum of a total of one thousand
          eight hundred eighty (1,880) hours per year of scientific work by an
          employee of Trubion on or directly related to and in support of the
          Research Program.


                                                                               5

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          Work on or directly related to the Research Program can include, but
          is not limited to, experimental preclinical laboratory and research
          work, recording and writing up results, reviewing literature and
          references, holding scientific discussions, managing and leading
          scientific staff and carrying out management duties, in each case
          where such activities are directly related to the Research Program.

     1.45. [***]

     1.46. [***]

     1.47. [***]

     1.48. [***]

     1.49. [***]

     1.50. "HSR ACT" shall mean the Hart-Scott-Rodino Antitrust Improvements Act
          of 1976, as amended, and the rules and regulations promulgated
          thereunder.

     1.51. "HSR FILING" shall mean filings by Wyeth and Trubion with the United
          States Federal Trade Commission and the Antitrust Division of the
          United States Department of Justice of a Notification and Report Form
          for Certain Mergers and Acquisitions (as that term is defined in the
          HSR Act) with respect to the matters set forth in this Agreement,
          together with all required documentary attachments thereto.

     1.52. "HSR CLEARANCE DATE" shall mean the earliest date on which the
          Parties have actual knowledge that all applicable waiting periods
          under the HSR Act with respect to the transactions contemplated
          hereunder have expired or have been terminated.

     1.53. "IND" shall mean an Investigational New Drug Application, as defined
          in the FD&C Act, that is required to be filed with the FDA before
          beginning clinical testing of a Licensed Product in human subjects, or
          an equivalent foreign filing.

     1.54. "INDEMNIFIED PARTY" shall have the meaning set forth in Section 10.3
          hereof.

     1.55. "INDEMNIFYING PARTY" shall have the meaning set forth in Section 10.3
          hereof.

     1.56. "INITIAL TERM" shall have the meaning set forth in Section 3.3.1
          hereof.

     1.57. "JDC" shall have the meaning set forth in Section 4.7 hereof.


                                                                               6

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     1.58. "JOINT INVENTION(S)" shall have the meaning set forth in Section
          6.1.1 hereof.

     1.59. "JOINT KNOW-HOW" shall mean that Know-How related to the Licensed
          Products that is jointly owned by the Parties in accordance with
          Section 6.1.1 of this Agreement.

     1.60. "JOINT PATENT COMMITTEE" shall mean the committee described in
          Section 6.1.3 hereof.

     1.61. "JOINT PATENT RIGHT(S)" shall mean those Patent Right(s) that claim
          Joint Know-How or Joint Invention(s).

     1.62. "JOINT TECHNOLOGY" shall mean the Joint Patent Rights, the Joint
          Inventions and the Joint Know-How.

     1.63. "JPT" shall have the meaning set forth in Section 4.8 hereof.

     1.64. "JRC" shall have the meaning set forth in Section 3.4.1 hereof.

     1.65. "JRC LIAISON" shall mean a JRC member designated by a Party as its
          "JRC Liaison" in accordance with Section 3.4.3 hereof.

     1.66. "KNOW-HOW" shall mean inventions, discoveries, data, information,
          processes, methods, techniques, materials, technology, results or
          other know-how, whether or not patentable.

     1.67. "LIABILITIES" shall have the meaning set forth in Section 10.1
          hereof.

     1.68. "LICENSED PRODUCT(S)" shall mean any Product(s) or Combination
          Product(s).

     1.69. "LICENSED TARGET(S)" shall mean any Trubion Target(s) or Wyeth
          Target(s), so long as they remain the subject of the licenses granted
          to Wyeth under this Agreement.

     1.70. "MAJOR INDICATION(S)" shall mean, with respect to any CD20 Product,
          any indication with a prevalence-based patient population of at least
          [***] patients in the United States, including, without limitation,
          [***].

     1.71. "MAJOR MARKET COUNTRY" shall mean any of the United States, the
          United Kingdom, France, Germany, Italy, Spain or Japan.

     1.72. "MANUFACTURING" or "MANUFACTURE" shall mean activities directed to
          producing, manufacturing, processing, filling, finishing, packaging,
          labeling, quality assurance testing and release, shipping and storage
          of a product.


                                                                               7

<PAGE>

     1.73. "NCBI" shall have the meaning set forth in Section 3.2.1 hereof.

     1.74. "NDA" shall have the meaning set forth in Section 1.100 hereof.

     1.75. "NET COMBINATION SALE AMOUNT" shall have the meaning set forth in
          Section 1.76 hereof.

     1.76. "NET SALES" shall mean the gross amounts charged for sales of
          Licensed Products (on which payments are due under this Agreement) by
          Wyeth or its sublicensees to Third Parties, less the sum of (a) and
          (b) where (a) is a provision, determined under Generally Accepted
          Accounting Principles in the United States and in accordance with
          Wyeth's customary and usual accrual procedures, consistently applied,
          for the accrual of (i) trade, cash, quantity and wholesaler discounts
          or rebates (other than price discounts granted at the time of sale),
           if any, allowed or paid, (ii) credits or allowances given or made for
          rejection or return of, previously sold Licensed Products or for
          retroactive price reductions (including Medicaid, managed care and
          similar types of rebates), (iii) taxes, duties or other governmental
          charges levied on or measured by the billing amount (excluding income
          and franchise taxes), as adjusted for rebates and refunds, and (iv)
          charges for packing, freight, and shipping to the extent included in
          the invoice price and (b) is a periodic adjustment (positive or
          negative, as applicable), determined under Generally Accepted
          Accounting Principles in the United States and in accordance with
           Wyeth's customary and usual adjustment procedures, consistently
          applied, of the provision determined in (a) to reflect amounts
          actually incurred for (i), (ii), (iii) and (iv) based on amounts
          actually invoiced or as separately set forth in agreements with Third
          Parties or as deducted or paid as required by applicable law or
          regulations. (The deductions described in (i), (ii), (iii) and (iv)
          are referred to herein as "Permitted Deductions.") In the case of any
          sale of Licensed Products for consideration other than cash, Net Sales
          shall be calculated on the fair market value of the consideration
          received.

          Notwithstanding the foregoing, if a Licensed Product is sold as a
          Combination Product (a "Combination Sale"), the Net Sales for such
          Combination Product shall be the portion of such Combination Sale
          allocable to the Licensed Product determined as follows:

          Except as provided below, the Net Sales amount for a Combination Sale
          shall equal the gross amount invoiced for the Combination Sale,
          reduced by the Permitted Deductions (the "Net Combination Sale
          Amount"), multiplied by the fraction A/(A+B), where:

               A is the invoice price, in the country where such Combination
               Sale occurs, of the Licensed Product contained in the Combination
               Product, if sold as a separate product in such country by Wyeth
               or


                                                                               8

<PAGE>

               its sublicensees, as the case may be, and B is the aggregate of
               the invoice price or prices, in such country, of products which
               collectively contain as their respective sole active ingredient
               such other pharmaceutically active compounds or substances, as
               the case may be, included in the Combination Product, if sold
                separately in such country by Wyeth or its sublicensees, as
               applicable.

          In the event that Wyeth or its sublicensees sell the Licensed Product
          included in a Combination Product as a separate product in a country,
           but do not separately sell all of the other pharmaceutically active
          compounds or substances, as the case may be, included in such
          Combination Product in such country, the calculation of the Net Sales
          amount for such Combination Sale shall be determined by multiplying
          the Net Combination Sale Amount by the fraction A/C where:

               A is the average wholesale price, in such country, charged by
               Wyeth or its sublicensees, as the case may be, for the Licensed
               Product contained in such Combination Product, when sold as a
               separate product by Wyeth or its sublicensees, as applicable, and
               C is the average wholesale price, in such country, charged by
                Wyeth or its sublicensees, as applicable, for the entire
               Combination Product.

          In the event that Wyeth or its sublicensees do not sell the Licensed
          Product included in a Combination Product as a separate product in a
          country where such Combination Sale occurs, but do separately sell
          products which collectively contain as their respective sole active
          ingredient all of the other pharmaceutically active compounds or
          substances, as the case may be, included in the Combination Product in
          such country, the calculation of Net Sales resulting from such
          Combination Sale shall be determined by multiplying the Net
          Combination Sale Amount by the fraction (C-D)/C, where:

               C is the average wholesale price, in such country, charged by
               Wyeth or its sublicensees, as the case may be, for the entire
               Combination Product, and D is the average wholesale price charged
                by Wyeth or its sublicensees, as the case may be, for the
               products which collectively contain as their sole active
               ingredient such other pharmaceutically active compounds or
               substances, as the case may be, included in the Combination
               Product.

          Where active ingredient portions of a Combination Product are sold
          separately as other products but in different dosage strengths than
          are in the Combination Product, the calculation of the Net Sales
          amount for such Combination Product shall be based on appropriate
          proration of the


                                                                               9

<PAGE>

          amounts of each active ingredient component included therein when
          applying the formulas set forth above.

          Where the calculation of Net Sales resulting from a Combination Sale
          in a country cannot be determined by any of the foregoing methods, the
          calculation of Net Sales for such Combination Sale shall be that
          portion of the Net Combination Sale Amount reasonably determined in
          good faith by the Parties as properly reflecting the value of the
          Licensed Product included in the Combination Product.

          Notwithstanding the foregoing, Net Sales shall not include any
          reimbursement received by Wyeth or its sublicensees in respect of the
          use of a Licensed Product in a country solely as part of a clinical
          trial prior to the receipt of marketing authorization required to
          commence commercial sales of such Licensed Product in such country.

     1.77. "NEW PROTEIN" shall have the meaning set forth in Section 1.45
          hereof.

     1.78. "NICHE INDICATION(S)" shall mean, with respect to any CD20 Product,
          any indication, including, but not limited to, [***], for such CD20
          Product other than a Major Indication.

     1.79. "NOTICE OF BREACH" shall have the meaning set forth in Section 9.5
          hereof.

     1.80. "NOTICE OF MODIFICATION" shall have the meaning set forth in Section
          9.5 hereof.

     1.81. "NOTICE OF TERMINATION" shall have the meaning set forth in Section
          9.5 hereof.

     1.82. "OTHER PRODUCT" shall mean any product containing a SMIP directed
          against a Wyeth Target or a portion thereof.

     1.83. "PART(Y/IES)" shall have the meaning set forth in the preamble
          hereof.

     1.84. "PATENT RIGHTS" shall mean any and all (a) patents, (b) pending
          patent applications, including, without limitation, all provisional
          applications, substitutions, continuations, continuations-in-part,
          divisions, renewals, and all patents granted thereon, (c) all
          patents-of-addition, reissues, reexaminations and extensions or
          restorations by existing or future extension or restoration
          mechanisms, including, without limitation, supplementary protection
          certificates or the equivalent thereof, (d) inventor's certificates,
          and (e) all United States and foreign counterparts of any of the
          foregoing.

     1.85. "PERSON" shall mean an individual, sole proprietorship, partnership,
          limited partnership, limited liability partnership, corporation,
          limited liability


                                                                              10

<PAGE>

          company, business trust, joint stock company, trust, incorporated
          association, joint venture or similar entity or organization,
          including a government or political subdivision, department or agency
          of a government.

     1.86. "PERMITTED DEDUCTION" shall have the meaning set forth in Section
          1.76 hereof.

     1.87. "PHASE I CLINICAL STUDY" shall mean a study of a Licensed Product in
          human subjects with the endpoint of determining initial tolerance,
          safety or pharmacokinetic information in single dose, single ascending
          dose, multiple dose and/or multiple ascending dose regimens.

     1.88. "PHASE II CLINICAL STUDY" shall mean a study of a Licensed Product in
          human patients to determine initial efficacy and dose range finding
          before embarking on Phase III Clinical Studies.

     1.89. "PHASE IIA CLINICAL STUDY" shall mean Trubion's TRU-015 Protocol
          15001.

     1.90. "PHASE IIB CLINICAL STUDY" shall mean Trubion's TRU-015 Protocol
          15002.

     1.91. "PHASE III CLINICAL STUDY" shall mean a pivotal study (whether or not
          denominated a "Phase III" clinical study under applicable regulations)
          in human patients with a defined dose or a set of defined doses of a
          Licensed Product designed to ascertain efficacy and safety of such
          Licensed Product for the purpose of enabling the preparation and
          submission of Regulatory Approval Applications to the competent
          Regulatory Authorities in a country of the Territory.

     1.92. "PREVIOUSLY DEPOSITED PROTEIN" shall have the meaning set forth in
          Section 3.2.4(b) hereof.

     1.93. "PRODUCT" shall mean any CD20 Product, [***], or Other Product, or
          any Conjugate of any CD20 Product, [***], or Other Product.

     1.94. "PRODUCT DATA AND FILINGS" shall mean (a) all clinical protocols,
          studies, clinical data and results used in or resulting from any
          clinical trial of any Licensed Product and (b) all INDs, Regulatory
          Approval Applications and Regulatory Approvals regarding any Licensed
          Product.

     1.95. "PRODUCT LICENSE" shall have the meaning set forth in Section 2.1.1
          hereof.

     1.96. "PRODUCT-RELATED PATENT RIGHTS" shall have the meaning set forth in
           Section 6.2.1(a) hereof.


                                                                              11

<PAGE>

     1.97. "PROVISIONAL EXCLUDED TARGET" shall mean a Target described in
          Section 3.2.4 hereof as a Provisional Excluded Target.

     1.98. "RECEIVING PARTY" shall have the meaning set forth in Section 7.1
          hereof.

     1.99. "RECOMBINANT DNA" shall mean the DNA sequences encoding any SMIP
          including, without limitation, any DNA plasmid expression construct
          encoding any such SMIP.

     1.100. "REGULATORY APPROVAL" shall mean the technical, medical and
          scientific licenses, registrations, authorizations and approvals
          (including, without limitation, approvals of New Drug Applications
          ("NDAs") or Biologic License Applications ("BLAs"), supplements and
          amendments, pre- and post- approvals, pricing approvals, and labeling
          approvals) of any national, supra-national, regional, state or local
          regulatory agency, department, bureau, commission, council or other
          governmental entity, necessary for the commercial Manufacture,
          distribution, marketing, promotion, offer for sale, use, import,
          export and sale of Licensed Product(s) in a regulatory jurisdiction in
          the Territory. For the sake of clarity, Regulatory Approval shall not
          be deemed to have been obtained in a country other than the United
          States until any applicable governmental pricing approvals have also
          been obtained in such country. Regulatory Approval of a Licensed
          Product shall be deemed to have been obtained in the United States
          immediately upon BLA approval for such Licensed Product in the United
           States.

     1.101. "REGULATORY APPROVAL APPLICATION" shall mean an application
          submitted to the appropriate Regulatory Authority seeking Regulatory
          Approval of a Licensed Product for use in one or more therapeutic
          indications in a regulatory jurisdiction within the Territory.

     1.102. "REGULATORY AUTHORIT(Y/IES)" shall mean any national (e.g., the
          FDA), supra-national (e.g., the European Commission, the Council of
          the European Union, or the European Agency for the Evaluation of
          Medicinal Products), regional, state or local regulatory agency,
          department, bureau, commission, council or other governmental entity
          in each country of the Territory involved in the granting of
           Regulatory Approval for a Licensed Product.

     1.103. "RELEASED TARGET" shall have the meaning set forth in Section 3.2.2
          hereof.

     1.104. "REPLACEMENT TARGET" shall have the meaning set forth in Section
          3.2.3 hereof.

      1.105. "RESEARCH BUDGET" shall have the meaning set forth in Section 3.5
          hereof.


                                                                              12

<PAGE>

     1.106. "RESEARCH PLAN" shall mean the written plan for the conduct of the
          Research Program described in Section 3.5 hereof as approved and
          amended by the Parties in accordance with Section 3.5 hereof.

     1.107. "RESEARCH PROGRAM" shall have the meaning set forth in Section 3.1
          hereof.

     1.108. "RESEARCH PROGRAM DATA" shall have the meaning set forth in Section
          3.7 hereof.

     1.109. "RESEARCH TERM" shall have the meaning set forth in Section 3.3.1
          hereof.

     1.110. "ROYALTY PERIOD" shall mean the period of time beginning on the date
          of the First Commercial Sale of a Licensed Product in any country and,
          on a Licensed Product-by-Licensed Product and country-by-country
          basis, extending until the earlier of (a) the termination of this
          Agreement pursuant to Article 9 hereof with respect to such Licensed
          Product in such country or (b) the later of (i) the date on which the
          last Valid Claim included within the Trubion Technology ceases to be a
          Valid Claim, which Valid Claim would be infringed by the composition,
          Manufacture, use, sale, offer for sale or importing of such Licensed
          Product in such country, or (ii)(A) with respect to CD20 Products, the
          [***] anniversary of the First Commercial Sale for the first Major
          Indication of such CD20 Product in such country (provided, however,
          that if such CD20 Product has received Regulatory Approval for a Niche
          Indication in such country but has not received Regulatory Approval
          for a Major Indication in such country, the Royalty Period as defined
          under and for purposes of this clause (ii)(A) for such CD20 Product in
          such country shall be suspended beginning on the [***] anniversary of
          the First Commercial Sale of such CD20 Product in such country until
          such time, if at all, as Regulatory Approval has been obtained
          permitting the marketing of such CD20 Product for a Major Indication
          in such country, at which point such Royalty Period shall commence
          with respect to such CD20 Product for a Major Indication) and (B) with
          respect to each other Licensed Product, the [***] anniversary of the
          First Commercial Sale of such Licensed Product in such country.

     1.111. "SIGNING DATE" shall have the meaning set forth in the preamble
          hereof.

     1.112. "SMIP(S)" or small modular immuno-pharmaceutical(s) shall mean a
          single chain polypeptide that (i) [***] (ii) binds with specificity to
          a target antigen, (iii) has a binding domain, and (iv) may have an
          effector domain which may or may not have effector function, [***].

     1.113. "SMIP IMPROVEMENT" shall mean an invention consisting of any
          modification to the polynucleotide sequence encoding or the amino acid


                                                                              13

<PAGE>

          sequence of a SMIP, if the practice of such invention would infringe
          Patent Rights Controlled by Trubion at the time such invention is
          made.

     1.114. [***].

     1.115. "SUCCESSOR PARTY" shall have the meaning set forth in Section
          9.10.2(a) hereof.

     1.116. "SUED PARTY" shall have the meaning set forth in Section 6.2.3(b)
          hereof.

     1.117. "TARGET" shall mean [***].

     1.118. "TARGET CANDIDATE" [***].

     1.119. "TERRITORY" shall mean the entire world.

     1.120. "THIRD PART(Y/IES)" shall mean any Person(s) other than Wyeth or
          Trubion.

     1.121. "TRADEMARK" shall mean those trademarks used in connection with the
          Commercialization of any Licensed Product by Wyeth or its sublicensees
          hereunder.

     1.122. "TRU-015" shall mean the chimeric SMIP directed against the CD20
          Antigen that is currently designated by Trubion as "TRU-015," as
          further described on Exhibit 1.122 attached hereto.

     1.123. "TRU-015 PRODUCT" shall mean any product containing TRU-015.

     1.124. "TRUBION" shall have the meaning set forth in the preamble hereof.

     1.125. "TRUBION ADDITIONAL THIRD PARTY LICENSE" shall have the meaning set
          forth in Section 6.2.3(a) hereof.

     1.126. "TRUBION INDEMNIFIED PARTY" shall have the meaning set forth in
          Section 10.1 hereof.

     1.127. "TRUBION KNOW-HOW" shall mean any Know-How, other than the Joint
          Know-How, that (a) Trubion Controls as of the Effective Date or that
          comes into the Control of Trubion during the term of this Agreement
          (other than through the grant of a license by Wyeth) and (b) relates
          to any Cell Lines, Conjugates, Licensed Products, Recombinant DNA,
          SMIPs, Licensed Targets, Target Candidates or the Development,
          Manufacture or use of any of the foregoing.

     1.128. "TRUBION LAWYERS" shall have the meaning set forth in Section 3.2.1
          hereof.


                                                                              14
<PAGE>

      1.129. "TRUBION PATENT RIGHTS" shall mean Patent Rights, other than Joint
          Patent Rights, that (a) Trubion Controls as of the Effective Date or
          that come into the Control of Trubion during the term of this
          Agreement and (b) claim any Trubion Know-How. Those Trubion Patent
          Rights known to be existing as of the Signing Date are listed on
          Exhibit 1.129 attached hereto.

     1.130. "TRUBION TARGET" shall mean each of the human CD20 Antigen and/or
          [***], as the context may require.

     1.131. "TRUBION TECHNOLOGY" shall mean Trubion's interest in the Trubion
          Patent Rights, the Trubion Know-How, the Joint Technology and the
          Research Program Data.

     1.132. "TRUBION THIRD PARTY AGREEMENT(S)" shall mean the agreements
          specified on Exhibit 1.132 between Trubion and the indicated Third
          Parties that relate to the research, Development, Manufacture and/or
          Commercialization of Licensed Products under this Agreement.

     1.133. "U.S. WYETH PHARMACEUTICALS" shall have the meaning set forth in
          Section 12.5 hereof.

     1.134. "VALID CLAIM" shall mean a claim that (a) in the case of any
          unexpired United States or foreign patent, shall not have been
          dedicated to the public, disclaimed, nor held invalid or unenforceable
          by a court or government agency of competent jurisdiction in an
          unappealed or unappealable decision, or (b) in the case of any United
          States or foreign patent application, (i) shall not have been
          cancelled, withdrawn or abandoned, without being refiled in another
          application in the applicable jurisdiction, (ii) shall not have been
          finally rejected by an administrative agency or other governmental
          action from which no appeal can be taken and (iii) shall not have been
          pending for more than [***], in either case which claim (if issued)
          would cover the Manufacture, use or sale of any Licensed Product. For
          purposes of this definition, the time period for which a claim is
          pending shall begin on the priority date for such claim, and shall
          continue until such claim is either issued or is no longer deemed to
           be a Valid Claim in accordance with the preceding sentence regardless
          of whether such claim is amended or refiled in another application in
          the applicable jurisdiction. If a claim of a patent application which
          ceased to be a Valid Claim under (b) due to the passage of time later
          issues as part of a patent described within (a) then it shall again be
          considered to be a Valid Claim effective as of the issuance of such
          patent.

     1.135. "WYETH" shall have the meaning set forth in the preamble hereof.

     1.136. "WYETH APPLIED TECHNOLOGY" shall mean, with respect to any Licensed
          Product, that Wyeth Technology which (a) Wyeth had applied to such


                                                                               15

<PAGE>

          Licensed Product prior to any termination of any rights under this
          Agreement with respect to such Licensed Product, provided that such
          Wyeth Technology is necessary or useful for the continued research,
          Development, Manufacture or Commercialization of such Licensed Product
          as it exists at the time of such termination, or (b) Wyeth had
          incorporated into such Licensed Product prior to any termination of
          rights under this Agreement with respect to such Licensed Product;
          provided that Wyeth shall use its Commercially Reasonable Efforts to
          sublicense or otherwise transfer rights under any Third-Party license
          to which the use or exploitation of such Wyeth Applied Technology is
          subject; and further provided, however, that with respect to each of
          clauses (a) and (b) of this Section 1.136, such Wyeth Technology shall
          not include any of Wyeth's conjugation technology.

     1.137. "WYETH INDEMNIFIED PARTY" shall have the meaning set forth in
          Section 10.2 hereof.

     1.138. "WYETH KNOW-HOW" shall mean any Know-How, other than the Joint
          Know-How, that (a) Wyeth Controls as of the Effective Date or that
          comes into the Control of Wyeth (other than as a result of the
          licenses granted by Trubion to Wyeth under Section 2.1 hereof) during
          the term of this Agreement and (b) relates to the Cell Lines,
          Conjugates, Recombinant DNA, Licensed Products, SMIPs, Target
          Candidates or Licensed Targets or the Development, Manufacture, use or
          Commercialization of any of the foregoing.

     1.139. "WYETH PATENT RIGHTS" shall mean Patent Rights, other than the Joint
          Patent Rights, that (a) Wyeth Controls as of the Effective Date or
          that come into the Control of Wyeth (other than as a result of the
          licenses granted by Trubion to Wyeth under Section 2.1 hereof) during
          the term of this Agreement and (b) claim any Wyeth Know-How.

     1.140. "WYETH TARGETS" shall mean the Targets designated by Wyeth under the
          Research Program, as described in Section 3.2 hereof.

     1.141. "WYETH TECHNOLOGY" shall mean Wyeth's interest in the Wyeth Patent
          Rights, the Wyeth Know-How, the Joint Technology and the Research
          Program Data.

2.    LICENSES.

     2.1. LICENSES TO WYETH.

          2.1.1. EXCLUSIVE LICENSES. Subject to the terms and conditions of this
               Agreement, Trubion, effective as of the Effective Date, hereby
               grants to Wyeth an exclusive license (exclusive even as to
               Trubion,


                                                                               16

<PAGE>

               except to the extent necessary for Trubion to perform its
               obligations under this Agreement), with the right to grant
               sublicenses in accordance with the provisions of Section 2.4
               hereof, under the Trubion Technology, to research, Develop, have
               Developed, make, have made, Manufacture, use, have used, import,
               have imported, export, have exported, distribute, have
               distributed, market, have marketed, offer and have offered for
               sale, sell, have sold and Commercialize (subject to Section 4.11)
               Licensed Products in the Territory (the license granted under
               this Section 2.1.1 is sometimes referred to herein as the
               "Product License").

          2.1.2. RETAINED RIGHTS OF TRUBION. For the avoidance of doubt, but
               subject to Sections 2.3 and 3.2 hereof, Trubion shall retain: (a)
               all rights under the Trubion Technology with respect to the
               research, Development, Manufacture, use and Commercialization of
               SMIPs that (i) [***] to Targets that are not Licensed Targets and
               (ii) do not [***] to any Licensed Targets; and (b) the right to
               use SMIPs which [***] to one or more Licensed Targets in in vitro
               studies conducted solely as part of Trubion's internal research
               efforts, provided, however, that Trubion shall not provide any
               such SMIP (that [***] to a Licensed Target) to any Third Party or
               utilize any such SMIP (that [***] to a Licensed Target) in a
               collaboration with any Third Party, except with Wyeth's prior
                written consent.

     2.2. LICENSE TO TRUBION. Wyeth hereby grants to Trubion a royalty-free
          non-exclusive license, with no right to grant sublicenses, under the
          Wyeth Technology, solely for the purpose of, and limited to, Trubion's
          use of the Wyeth Technology in connection with the Trubion Technology
          to research, Develop, have Developed, make, have made, use and have
          used Licensed Products to fulfill its obligations under this
          Agreement. In addition, Wyeth hereby grants to Trubion the
          non-exclusive license under Wyeth's rights to Covered SMIP
          Improvements as set forth in greater detail in Section 6.1.2.

     2.3. EXCLUSIVITY.

          2.3.1. CD20 PRODUCT EXCLUSIVITY. Subject to Section 2.3.3, and except
               for Development of the CD20 Products pursuant to the terms of
               this Agreement, neither Party shall Develop any human therapeutic
               product that contains a protein that [***] to the CD20 Antigen
               during the time period beginning on the Effective Date and ending
               on the earlier of: (a) the First Commercial Sale of any CD20
               Product for a Major Indication in a Major Market Country or (b)
                the termination of the licenses granted by Trubion to Wyeth under
               this Agreement with respect to all CD20 Products.


                                                                              17

<PAGE>

               Subject to Section 2.3.3, and except for Commercialization of the
               CD20 Products pursuant to the terms of this Agreement, neither
               Party shall Commercialize any human therapeutic product that
               contains a protein that [***] to the CD20 Antigen during the time
               period beginning on the Effective Date and ending on the earlier
               of (a) five (5) years after the First Commercial Sale of any CD20
               Product for a Major Indication in a Major Market Country or (b)
               the termination of the licenses granted by Trubion to Wyeth under
               this Agreement with respect to all CD20 Products.

          2.3.2. [***] EXCLUSIVITY. Subject to Section 2.3.3, and except for
                Development of the [***] pursuant to the terms of this Agreement,
               neither Party shall Develop any human therapeutic product that
               contains a protein that [***] to the [***] during the time period
               beginning on the Effective Date and ending on the earlier of: (a)
               the First Commercial Sale of any [***] in any Major Market
               Country or (b) the termination of the licenses granted by Trubion
               to Wyeth under this Agreement with respect to all [***].

               Subject to Section 2.3.3, and except for Commercialization of the
               [***] pursuant to the terms of this Agreement, neither Party
               shall Commercialize any human therapeutic product that contains a
               protein that [***] to the [***] during the time period beginning
               on the Effective Date and ending on the earlier of: (a) five (5)
               years after the First Commercial Sale of any [***] in any Major
                Market Country or (b) the termination of the licenses granted by
               Trubion to Wyeth under this Agreement with respect to all [***].

          2.3.3. LIMITATIONS. The exclusivity provisions of Sections 2.3.1 and
               2.3.2 above (a) shall not apply to Wyeth's Manufacture of any
               product for a Third Party pursuant only to a contract
               manufacturing or supply agreement between Wyeth and such Third
               Party where Wyeth is acting only as a contract manufacturer or
               supplier for such Third Party, (b) shall in no way limit any of
               the licenses granted by Trubion to Wyeth under Section 2.1
               hereof, and (c) shall in no way limit any of the retained rights
                of Trubion set forth in Section 2.1.2 hereof.

     2.4. SUBLICENSING. Wyeth may grant to one or more Third Parties sublicenses
          of the rights granted to it under Section 2.1 hereof at any time;
          provided that Wyeth shall execute a written agreement with each such
          sublicensee and shall comply with the following: Each such sublicense
          (a) shall be subject and subordinate to, and consistent with, the
          terms and conditions of this Agreement, (b) shall not in any way
          diminish, reduce or eliminate any of Wyeth's obligations under this
          Agreement, (c) shall require each such sublicensee to comply with all
          applicable terms of this Agreement,


                                                                               18

<PAGE>

          including to keep books and records, and permit Wyeth to audit (either
          directly or through an independent auditor) such books and records,
          and (d) shall provide that any such sublicensee shall not further
          sublicense except on terms consistent with this Section 2.4. Wyeth
          shall provide Trubion with a copy of each such sublicense agreement
          within thirty (30) days after the execution thereof. Such copy may be
          redacted to exclude confidential, non-Licensed Product-related
          information and financial information (other than such financial
          information that is necessary for assessing the obligations to Trubion
          under this Agreement). Upon Trubion's request and at Trubion's
          expense, Wyeth shall exercise its right to conduct an audit of a
          sublicensee's books and records pertaining to the sale of a Licensed
          Product under any such sublicense agreement at the next time that
          conducting such an audit is permissible under such sublicense
          agreement. Wyeth shall provide Trubion with a copy of the report of
          the findings made in any such audit. If such audit reveals that such
          sublicensee has understated its Net Sales by [***] or more, Wyeth
          shall be responsible for the costs of the audit. Wyeth shall remain
          responsible for its obligations hereunder and for the performance of
          its sublicensees (including, without limitation, making all payments
          due Trubion by reason of any Net Sales of Licensed Products), and
          shall ensure that any such sublicensees comply with all relevant
          provisions of this Agreement. In the event of any uncured material
          breach by any sublicensee under a sublicense agreement that would
          constitute a breach of Wyeth's obligations under this Agreement, Wyeth
          will promptly inform Trubion in writing and shall take such action
          which in Wyeth's reasonable business judgment will address such
          default; provided, however, any such uncured material breach by such
          sublicensee of an obligation that would constitute a breach of Wyeth's
          obligations under this Agreement shall be deemed an uncured material
          breach of Wyeth hereunder unless Wyeth cures such material breach
          within the time provided under Section 9.5 hereof.

     2.5. DIRECT LICENSES TO AFFILIATES. Wyeth may at any time request and
          authorize Trubion to grant licenses within the scope of Section 2.1
          directly to Affiliates of Wyeth by giving written notice designating
          to which Affiliate a direct license is to be granted. Upon receipt of
          any such notice, Trubion shall enter into and sign a separate direct
          license agreement with such designated Affiliate of Wyeth. All such
          direct license agreements shall be consistent with the terms and
          conditions of this Agreement, except for such modifications as may be
          required by the laws and regulations in the country in which the
          direct license will be exercised; provided, however, that Trubion
          shall have no obligation to enter into any such direct license
          agreement if the effect of entering into such agreement (and
          continuing as a Party to this Agreement) would be to increase the
          level of obligations owed by Trubion, decrease the obligations owed to
          Trubion or


                                                                              19
<PAGE>

          the enforceability thereof, or decrease the consideration owed to
          Trubion relative to the obligations owed by or to, or the
          consideration owed to, Trubion under this Agreement, had such direct
          license(s) not been granted. In countries where the validity of such
          direct license agreement requires prior government approval or
          registration, such direct license agreement shall not become binding
          between the parties thereto until such approval or registration is
          granted, which approval or registration shall be obtained by Wyeth.
          All costs of making such direct license agreement(s), including
          Trubion's reasonable attorneys' fees, under this Section 2.5 shall be
          borne solely by Wyeth.

     2.6. RIGHT OF REFERENCE. Trubion hereby grants to Wyeth a "Right of
          Reference," as that term is defined in 21 C.F.R. Section 314.3(b), to
          any data Controlled by Trubion that relates to any CD20 Product (and
          any other Licensed Product, to the extent applicable), and Trubion
          shall provide a signed statement to this effect, if requested by
          Wyeth, in accordance with 21 C.F.R. Section 314.50(g)(3).

     2.7. SECTION 365(N) OF BANKRUPTCY CODE. All rights and licenses now or
          hereafter granted under or pursuant to any Section of this Agreement,
          including Sections 2.1 and 2.5 hereof, are rights to "intellectual
          property" (as defined in Section 101(35A) of Title 11 of the United
          States Code, as amended (such Title 11, the "Bankruptcy Code")). In
          the event this Agreement is rejected under Section 365 of the
          Bankruptcy Code, Trubion hereby grants to Wyeth, subject to Wyeth's
          obligations under Sections 365(n)(2)(A) and (B), a right of access and
          to obtain possession of and to benefit from each of the following
          embodiments to the extent related to Wyeth's exercise of its license
          rights to any Licensed Products or otherwise related to any rights or
          licenses granted under or pursuant to any Section of this Agreement:
           (i) copies of pre-clinical and clinical research data and results,
          (ii) aliquots of laboratory samples, (iii) Licensed Product samples
          and inventory, (iv) Cell Lines expressing Licensed Products, libraries
          encoding Licensed Products or components thereof and sequences
          thereof, (v) copies of laboratory notes and notebooks pertaining to
          Licensed Products, (vi) copies of data and results related to clinical
          trials of Licensed Products, (vii) regulatory filings and approvals of
          Licensed Products, (viii) rights of reference in respect of regulatory
          filings and approvals of Licensed Products, and (ix) plasmid and
          vectors encoding Licensed Product SMIPs, all of which constitute
          "embodiments" of intellectual property pursuant to Section 365(n) of
          the Bankruptcy Code, and (xi) all other embodiments of such
          intellectual property in Trubion's possession or control. Recognizing
          that the embodiments described above may be useful or necessary to
          Trubion in connection with its continued operation of its business,
          and that a Third Party may also have a right of access to such
          embodiment under Section 365(n) of the Bankruptcy Code or applicable
          non-bankruptcy law, where there is a fixed


                                                                              20

<PAGE>

          or limited quantity of any biological material or other tangible item
           of such embodiment described above, Wyeth shall be entitled to a pro
          rata portion thereof. Trubion agrees not to interfere with Wyeth's
          exercise under the Bankruptcy Code of rights and licenses to
          intellectual property licensed hereunder and embodiments thereof in
          accordance with this Agreement and agrees to use Commercially
          Reasonable Efforts (short of any obligation of Trubion to incur
          expenses in connection therewith) to assist Wyeth to obtain such
          intellectual property and embodiments thereof in the possession or
          control of Third Parties as reasonably necessary or useful for Wyeth
          to exercise such rights and licenses in accordance with this
          Agreement; provided, however, that Trubion's Commercially Reasonable
          Efforts for purposes of this Section 2.7 shall not be deemed to
          include an obligation to make payments to Third Parties to obtain such
          intellectual property rights and embodiments thereof. The Parties
          hereto acknowledge and agree that reimbursement payments pursuant to
          Sections 3.6 and 4.6 and all other payments by Wyeth to Trubion
          hereunder other than royalty payments pursuant to Section 5.4 and
          Additional Research and Development Expense Payments under Section 5.3
          do not constitute royalties within the meaning of Bankruptcy Code
          Section 365(n) or relate to licenses of intellectual property
          hereunder.

     2.8. NO IMPLIED RIGHTS. Except as expressly provided in this Agreement,
          neither Party shall be deemed by estoppel or implication to have
          granted the other Party any license or other right with respect to any
          intellectual property of such Party.

3.    RESEARCH PROGRAM.

     3.1. SCOPE AND CONDUCT OF THE RESEARCH PROGRAM. Under the terms and
          conditions set forth herein, Trubion and Wyeth shall collaborate
          through one or more joint project teams in the conduct of a
          pre-clinical research program to identify and evaluate (a) SMIPs
          directed against Licensed Targets and (b) Licensed Products, including
          CD20 Products, [***] and Other Products (collectively, the "Research
           Program"). Such activities shall include, but not be limited to, the
          following:

          [***]

          Subject to and in accordance with the Research Plan and the
          Development Plan (to the extent applicable), the JRC shall determine
          the appropriate activities to be undertaken by Trubion and Wyeth;
          provided, however, that, as of the Signing Date, the Parties
          anticipate that Trubion shall conduct activity (i) above (with input
          from Wyeth), Wyeth shall conduct activities (v), (vi) and (vii) above,
          and Trubion and Wyeth shall jointly conduct activities (ii), (iii) and
          (iv) above. The Research Program shall be conducted in accordance with
          the Research Plan, and each Party shall use its Commercially
          Reasonable Efforts to perform all of its obligations


                                                                              21

<PAGE>

          under the Research Program in accordance with the Research Plan and
          current good laboratory practices.

     3.2. DESIGNATION OF TARGETS..

          3.2.1. DESIGNATION OF TARGETS. Within thirty (30) days after the
               Effective Date, Wyeth shall provide Trubion's Vice President,
                Legal Affairs & Chief Patent Counsel with a list of up to [***]
               Targets (each a "Target Candidate") from which Wyeth shall have
               the exclusive right, until [***], to designate up to [***] Wyeth
               Targets, in accordance with the following provisions (subject to
               Wyeth's right under Section 3.2.3 to designate as Wyeth Targets
               up to [***] Targets (of the [***] Targets that Wyeth may
               designate as Wyeth Targets) that are not Target Candidates at the
               time of selection). In the case of protein Targets that are
               Target Candidates, Wyeth shall designate each such Target
               Candidate on the list by its GenBank accession number provided by
               the National Center for Biotechnology Information ("NCBI")
               (including any nomenclature describing such Target Candidate that
               is provided therewith) or, if an NCBI GenBank accession number is
               not available for such Target Candidate, by its nucleotide and
               amino acid sequences. For the avoidance of doubt, Wyeth may not
               designate as Target Candidates any Targets that are Excluded
               Targets. Subject to the following procedures, Trubion shall not
               undertake any research or Development activities beyond Milestone
               One (as defined on Exhibit 3.2.1 attached hereto) of Trubion's
               internal product development process, or propose to enter into or
               enter into any agreement with any Third Party with respect to any
               SMIP directed against any Target Candidate or with respect to any
               Licensed Product containing such a SMIP, unless and until such
               Target Candidate becomes a Released Target, Excluded Target or
               Provisional Excluded Target. Trubion, through its Legal
               Department, shall maintain a copy of the list of Target
               Candidates in a secure location. Trubion shall take reasonable
               measures and implement reasonable procedures to ensure that only
               its inside attorneys who are employees of its Legal Department
               and its outside patent counsel (collectively, "Trubion Lawyers")
               have knowledge of and access to Wyeth's Target Candidate list.
               The Target Candidate list shall be considered Confidential
               Information of Wyeth, and except as expressly permitted under
               this Section 3.2 or otherwise under this Agreement, Trubion shall
               not use or disclose the Target Candidate list or the information
               set forth therein to any of its Affiliates, to any Third Party,
               or to any employees, officers or agents of Trubion other than
               Trubion Lawyers. For so long as a Target remains a Target
               Candidate, Trubion, through its Legal Department, shall implement
               reasonable


                                                                               22
<PAGE>

               procedures to maintain records of all Third Party inquiries to
               Trubion and Trubion's responses to same, relating to the Target
               Candidate list made pursuant to this Section 3.2. The Trubion
               Legal Department shall also maintain the list of Released
               Targets, Excluded Targets and Provisional Excluded Targets in
               accordance with the provisions of Sections 3.2.2 and 3.2.4. In
               the event of a bona fide dispute arising under this Agreement
               relating to the Target selection process described in this
               Section 3.2, Trubion shall provide to an independent Third Party
               selected by Wyeth and reasonably acceptable to Trubion access to
               the lists of Target Candidates, Released Targets, Excluded
               Targets and Provisional Excluded Targets and records and
               processes related thereto (to the extent relevant to the bona
               fide dispute) maintained by Trubion in accordance with this
               Section 3.2. Such independent Third Party may only communicate to
               Wyeth whether or not the Target selection process was properly
               performed by Trubion's Lawyers.

          3.2.2. RELEASED TARGETS. On or before [***], Wyeth, by written notice
               to Trubion's Vice President, Legal Affairs & Chief Patent
               Counsel, shall identify [***] Target Candidates from the list
               delivered pursuant to Section 3.2.1 (inclusive of any Target
               Candidates that have become Released Targets during such period
               pursuant to Section 3.2.4 hereof), which from the date of such
               identification shall cease to be Target Candidates (each, a
               "Released Target"). At the time that a Target Candidate becomes a
               Released Target, Trubion, subject to Section 2.8, shall be free
               to undertake research and Development activities independent of
               obligations under this Agreement, and to enter into discussions
               or an agreement with a Third Party, with respect to SMIPs
               directed against any such Released Target or any other activities
               in connection with such Released Target. On or before [***],
               Wyeth, by written notice to Trubion, shall identify such
               additional Target Candidates from the list delivered pursuant to
               Section 3.2.1, if any, as additional Released Targets, such that
               there are no more than [***] Target Candidates remaining on the
               list delivered pursuant to Section 3.2.1 (less the number of
               Wyeth Targets that were Target Candidates at the time of
               selection as a Wyeth Target(s) pursuant to Section 3.2.3), which
               from the date of such identification shall cease to be Target
               Candidates and, thereafter each shall also become a Released
               Target. At the end of the Research Term, all remaining Target
               Candidates, if any, shall become Released Targets.

          3.2.3. WYETH TARGETS. Wyeth Targets shall be designated only from
               either (a) Target Candidates that have not become Released
               Targets, or (b) any other Target (including a Released Target
               that


                                                                               23

<PAGE>

               is or becomes available, as described below) that is not then an
               Excluded Target or a Provisional Excluded Target; provided,
               however, that no more than [***] of the Targets designated by
               Wyeth as Wyeth Targets may be Targets that are not Target
               Candidates at the time of selection. Subject to the foregoing
               sentence, Wyeth shall designate: (y) [***] Target Candidates or
               other Targets as Wyeth Targets on or before [***]; and (z) up to
               [***] Target Candidates or other Targets (inclusive of those
               designated as Wyeth Targets during [***] ) as Wyeth Targets on or
               [***]; provided, however, if Wyeth does not designate [***] Wyeth
               Targets on or before such [***], then the lesser number of Wyeth
               Targets so designated shall be the total number of Wyeth Targets
               under this Agreement unless Wyeth extends the Research Program,
               in which case Wyeth may designate, before[***], [***] additional
               Wyeth Targets (up to a cumulative total [***] in the aggregate).
               For the avoidance of doubt and subject to the following sentence,
               Wyeth may designate only up to [***] Wyeth Targets from the
               Effective Date of this Agreement through the end of the Research
               Program (even if extended). During the term of the Research
               Program, Wyeth shall have the right to [***]; provided that [***]
               (a "REPLACEMENT TARGET") must be [***]. In the event that Wyeth
               nominates as a Wyeth Target (whether as a proposed initial
               designation of a Wyeth Target or as a replacement designation as
               a Wyeth Target) a Target that is not then a Target Candidate,
               Trubion's Legal Department, within ten (10) business days after
               receiving written notice of such nomination, shall determine and
               advise Wyeth in writing whether such Target is an Excluded Target
               or a Provisional Excluded Target, as described below (and shall
               indicate whether such Target is an Excluded Target or is a
               Provisional Excluded Target). If such Target is an Excluded
               Target or a Provisional Excluded Target, it shall not be eligible
               to be considered a Wyeth Target. If a proposed Replacement Target
               is not an Excluded Target or a Provisional Excluded Target, then
               the JRC shall either approve or disapprove designation of such
               proposed Replacement Target as a Wyeth Target; provided that the
               original Wyeth Target that Wyeth proposes to replace shall be
               automatically deemed a Released Target upon the JRC's approval of
               the designation of the Replacement Target.

          3.2.4. EXCLUDED TARGETS. Excluded Targets are not eligible to be Wyeth
               Targets for so long as they remain Excluded Targets. The Targets
               deemed "Excluded Targets" as of the Effective Date are set forth
               in Exhibit 3.2.4 attached hereto. Trubion may add additional
                Targets as Excluded Targets or Provisional Excluded Targets


                                                                              24

<PAGE>

               (which may be selected from Released Targets and other Targets,
               but would not include any Wyeth Targets or any Target Candidate
               that has not become a Released Target) in accordance with the
               following procedures:

               (A)   During the period when [***], and upon the written request
                     of a potential Third Party collaborator and/or licensee of
                    Trubion pertaining to the identification, generation and/or
                    Development of SMIPs directed against a Target or Targets,
                    Trubion's Legal Department shall promptly determine whether
                    or not any of such Targets is a Wyeth Target.

               (B)   With respect to any Target newly submitted by a Party to
                    Trubion's Legal Department hereunder, Trubion's Lawyers will
                    determine whether such submitted Target [***] Licensed
                    Targets, Target Candidates, Released Targets, Excluded
                    Targets and Provisional Excluded Targets available to
                     Trubion's Lawyers (each a "Previously Deposited Protein").
                    By way of example only,[***]. Should Wyeth designate a
                    Target that is not a protein, the Parties agree to negotiate
                    in good faith the procedure for identifying and testing
                    whether a subsequent proposed non-protein Target is the
                    "same as" such designated non-protein Target for purposes of
                    this Section 3.2.

                (C)   If Trubion's Legal Department determines, in accordance with
                    Section 3.2.4(b) above, that any such Target is a Wyeth
                    Target, Trubion shall not proceed with such potential Third
                    Party collaboration or license with respect to such Target.
                    If any of such Targets is not a Wyeth Target or a Target
                    Candidate, such Target shall automatically be deemed a
                    "Provisional Excluded Target". If such Target is a Target
                    Candidate, Trubion shall notify Wyeth in writing of
                    Trubion's request that a Target Candidate be recategorized
                    as a Released Target, in order for Trubion to be able to
                     enter substantive negotiations with such Third Party
                    regarding such Target that is a Target Candidate (i.e.,
                    Trubion shall "Put" such Target Candidate to Wyeth). Trubion
                    shall have no obligation to notify Wyeth of the identity of
                    such Third Party or the purpose of the proposed
                    collaboration or license. From the date that Trubion "Puts"
                    such Target Candidate to Wyeth, Wyeth shall have [***] with
                    respect to such Puts made to Wyeth prior to [***], and shall
                    have [***] with respect to such Puts made thereafter, to
                    notify Trubion in writing whether


                                                                               25

<PAGE>

               Wyeth designates such Target Candidate as a Wyeth Target or
               recategorizes such Target Candidate as a Released Target. If
               Wyeth fails to notify Trubion within such [***] period,
               respectively, then such Target Candidate shall automatically be
               deemed a Released Target. Any such Released Targets shall be
               deemed to be Provisional Excluded Targets.

                (D)   If Trubion and such potential Third Party collaborator
                    and/or licensee do not enter into a definitive agreement
                    regarding such Provisional Excluded Target within [***]
                    after the date that such Target is deemed a Provisional
                    Excluded Target (such [***] being subject to a [***]
                    extension by Trubion, if Trubion declares, in writing, to
                    Wyeth that at least one draft definitive agreement has been
                    exchanged between Trubion and such potential Third Party
                    collaborator and/or licensee), thereafter such Provisional
                    Excluded Target would revert to being a Released Target. If
                     Trubion and such potential Third-Party collaborator and/or
                    licensee enter into a definitive agreement within the time
                    period provided above, such Provisional Excluded Target
                    shall be deemed an Excluded Target.

               (E)   During the period when [***], if Trubion itself identifies
                    internally a Target that has progressed to Milestone One (as
                    defined in Exhibit 3.2.1 attached hereto) of Trubion's
                    internal product development process, Trubion's Legal
                    Department shall promptly determine whether or not such
                    Target is a Target Candidate. If such Target is not a Target
                     Candidate, such Target shall be deemed an Excluded Target.
                    If Trubion thereafter abandons work on such Excluded Target,
                    Trubion shall notify Wyeth in writing that Trubion has
                    abandoned work on such Excluded Target and such Excluded
                    Target shall thereafter be deemed a Released Target. If such
                    Target is a Target Candidate, Trubion may Put such Target
                    Candidate to Wyeth. From the date that Trubion Puts such
                    Target Candidate to Wyeth, Wyeth shall have [***] with
                    respect to such Puts made to Wyeth prior to [***], and shall
                    have [***] with respect to such Puts made thereafter, to
                     notify Trubion in writing whether Wyeth designates such
                    Target Candidate as a Wyeth Target or recategorizes such
                    Target Candidate as a Released Target. If Wyeth fails to
                    notify Trubion within such[***], respectively, then such
                    Target Candidate shall automatically be deemed a Released
                    Target. Any such Released Target shall be deemed to be
                    Excluded Target. If


                                                                               26

<PAGE>

                    Trubion thereafter abandons work on any such Excluded
                    Target, Trubion shall notify Wyeth in writing that Trubion
                    has abandoned work on such Excluded Target and such Excluded
                    Target shall thereafter be deemed a Released Target.

               (F)   With respect to the Puts described in (c) and (e) above,
                    Trubion shall not be permitted to Put more than [***] Target
                    Candidates to Wyeth during the first [***] of the Research
                    Program.

     3.3. TERM AND TERMINATION OF THE RESEARCH PROGRAM.

          3.3.1. RESEARCH TERM. The term of the Research Program (the "Research
               Term") shall begin on the Effective Date and shall continue until
               [***] (the "Initial Term"), subject to extension as described
               below. At Wyeth's option (exercisable by providing written notice
               to Trubion no later than [***] prior to the end of the Initial
               Term of the Research Program or any extension year thereof), the
               Research Term may be extended for up to [***] additional [***]
               periods and, thereafter, shall be renewable annually only upon
               mutual written agreement of the Parties.

          3.3.2. TERMINATION OF RESEARCH PROGRAM BY WYETH. Commencing on the
               first anniversary of the Effective Date, Wyeth shall have the
               right to terminate the Research Program, at will, at any time, in
               its entirety, upon one (1) year prior written notice to Trubion;
               provided that Trubion shall have no obligation after the
                effective termination date to complete any Research Program
               activities in connection with any Trubion Target, Wyeth Target,
               SMIP or Licensed Product. Such termination of the Research
               Program shall not constitute termination of this Agreement and
               shall not affect the Parties' rights and obligations under this
               Agreement other than those relating to the Research Program.


                                                                               27

<PAGE>

     3.4. JOINT RESEARCH COMMITTEE.

          3.4.1. COMPOSITION. Within thirty (30) days after the Effective Date,
               the Parties shall establish a Joint Research Committee (the
               "JRC") to oversee the Research Program. The JRC will be in effect
               only during the Research Term. The JRC shall be composed of three
               (3) representatives from each Party. Each Party may replace any
               of its representatives at any time upon written notice to the
               other Party. From time to time, the JRC may establish
               subcommittees to oversee particular projects or activities, and
               such subcommittees shall be constituted as the JRC decides.

          3.4.2. RESPONSIBILITIES. The JRC shall be responsible for
               establishing, reviewing and recommending modifications and
               updates to the Research Plan, including the Research Budget, in
               accordance with Section 3.5 hereof, monitoring and reporting to
               the Parties on activities conducted pursuant to the Research
               Plan, and for such other functions as agreed by the Parties.

          3.4.3. MEETINGS. The JRC shall meet as soon as practicable after it is
               established by the Parties and, thereafter, at such additional
               times as the Parties deem appropriate, not less frequently than
               quarterly. Each Party shall designate one of its JRC members as
               its "JRC Liaison" to co-chair meetings, prepare and circulate JRC
               meeting agendas and JRC meeting minutes. The meetings of the JRC
               shall be held in the United States, and shall alternate between
                the Parties' business locations or as otherwise decided by the
               JRC. JRC meetings may be conducted in person, by telephone or by
               videoconference. Each Party shall use reasonable efforts to cause
               its representatives to attend the meetings of the JRC. If a
               representative of a Party is unable to attend a meeting, such
               Party may designate an alternate member to attend such meeting in
               place of the absent member.

           3.4.4. VOTING. Decisions of the JRC shall be made by unanimous
               consent, with each Party having one vote. The JRC may act without
               a meeting if an action by unanimous written consent is signed by
               each Party's JRC Liaison.

          3.4.5. DISPUTE RESOLUTION. If the JRC is unable to reach agreement on
               a matter, the matter may be referred, at the request of either
               Party, for resolution through good faith discussions between
                Wyeth's Executive Vice President of Discovery Research and
               Trubion's Senior Vice President of Research and Development or
               their respective designees. Notwithstanding the foregoing, in the
               event the JRC cannot promptly resolve a disagreement or a voting


                                                                              28

<PAGE>

               deadlock regarding the Research Program, Wyeth's Executive Vice
               President of Discovery Research shall have the right to cast a
               tie-breaking vote to resolve any such disagreement or voting
               deadlock, such right and tie-breaking authority being subject to
               the terms and conditions of this Agreement.

           3.4.6. MINUTES. The JRC shall keep accurate and complete minutes of
               its meetings that record all proposals and recommendations made,
               and all actions and decisions taken. The JRC minutes shall not be
               effective until approved in writing by each Party's JRC Liaison.
               All records of the JRC shall be available at all times to each
               Party.

     3.5. RESEARCH PLAN. The Parties shall use their Commercially Reasonable
          Efforts to develop and approve a complete Research Plan (including a
          corresponding Research Budget) within sixty (60) days of the Effective
          Date. The Parties shall ensure that the Research Plan is consistent
          with the terms and conditions of this Agreement, and the Research Plan
          shall not impose obligations on either Party that are inconsistent
          with the terms of this Agreement. The Research Plan shall set forth
          generally (a) the activities to be undertaken by the Parties under the
          Research Program consistent with the terms of Section 3.1, (b) the
          utilization of [***] Trubion FTEs in conducting such activities, (c)
          the anticipated schedule on which such activities are to be conducted,
          (d) the desired deliverables to be provided by each Party with respect
          to each Licensed Target that is the subject of the Research Program,
          and (e) the annual budget for non-ordinary expenses (as described in
           Section 3.6.1 below) to be incurred by Trubion under the Research
          Program (the "Research Budget"). The JRC shall review the Research
          Plan, including the Research Budget, on at least an annual basis and
          submit any proposed modifications or updates to the Parties for review
          and approval; any such modifications or updates shall not become
          effective until approved in writing by an authorized officer of each
          of the Parties. The Parties shall review and consider any such
          proposed modifications or updates on an expeditious basis. The Parties
          shall promptly amend the Research Plan from time to time to address
          the performance of the Research Program as it relates to any Licensed
          Targets designated by Wyeth in accordance with Section 3.2 above.

     3.6. FUNDING OF THE RESEARCH PROGRAM.

          3.6.1. RESEARCH FUNDING. During each year of the Research Term (as it
               may be extended), Wyeth shall pay Trubion [***] per year for
               services performed in accordance with the Research Plan. Trubion
               shall commit to the Research Program [***] FTEs per year to


                                                                               29

<PAGE>

               provide services in furtherance of the Research Program in
               accordance with the Research Plan. For the avoidance of doubt,
               Trubion may, at its sole expense and discretion, devote more than
                [***] FTEs from time to time to provide services in furtherance
               of the Research Program. The [***] in research funding described
               above shall be increased automatically once per calendar year by
               the percentage change in the U.S. Consumer Price Index, All Urban
               Consumers over the previous year; provided, however, that no
               increase shall be effective prior to January 1, 2007. [***]
               Trubion shall provide to Wyeth, prior to the first day of each
               Calendar Quarter, a forecast of such expenses (by major expense
               category, on an accrual basis) reimbursable under this Section
               3.6.1 which Trubion expects to incur during such Calendar Quarter
               and the subsequent three Calendar Quarters, in each case shown by
               month. Other than the foregoing amounts and except as otherwise
               expressly provided in this Agreement, each Party shall be solely
                responsible for its costs and expenses incurred in performing its
               obligations under the Research Program.

          3.6.2. REIMBURSEMENT PAYMENTS. Reimbursement to be made to Trubion by
               Wyeth pursuant to Section 3.6.1 will be made pursuant to invoices
               submitted by Trubion to Wyeth no more often than once with
               respect to any Calendar Quarter, within thirty (30) days of the
               end of such Calendar Quarter. Payment shall be due within
               forty-five (45) days after Wyeth receives such an invoice from
               Trubion. Each invoice must be accompanied by supporting
               documentation sufficiently demonstrating the expense so paid on a
               cash basis (such as receipts for out-of-pocket expenses and other
               written documentation reasonably acceptable to Wyeth) and by a
               certificate executed by Trubion's VP, Finance & Administration,
               of the number of FTEs used by Trubion in such Calendar Quarter in
               performing Trubion's obligations under the Research Program.
               Except as approved in writing in advance by Wyeth, Wyeth shall
               not be obligated to reimburse Trubion for amounts in excess of
               the applicable budgeted amounts in the Research Budget.

          3.6.3. RECORDS AND AUDITS. During the Research Term, Trubion shall
               keep books and accounts of record in connection with the expenses
                reimbursable under Section 3.6.1 hereof in accordance with GAAP
               and in sufficient detail to permit accurate determination of all
               figures necessary for verification of costs to be reimbursed
               hereunder. Trubion shall maintain such cost records for a period
               of at least three (3) years after the end of the calendar year in
               which they were generated in order to enable audit of such
               records as set forth below. Upon thirty (30) days prior written
               notice from Wyeth, Trubion shall permit an independent certified
               public


                                                                              30

<PAGE>

               accounting firm of nationally recognized standing selected by
               Wyeth and reasonably acceptable to Trubion, to examine, at
               Wyeth's sole expense, the relevant books and records of Trubion
               as may be reasonably necessary to verify the amount of
               reimbursable out-of-pocket expenses incurred. An examination by
               Wyeth under this Section 3.6.3 shall occur not more than once in
               any calendar year and shall be limited to the pertinent books and
                records for any calendar year ending not more than thirty six
               (36) months before the date of the request. The accounting firm
               shall be provided access to such books and records at Trubion's
               facility(ies) where such books and records are normally kept and
               such examination shall be conducted during Trubion's normal
               business hours. Trubion may require the accounting firm to sign a
               standard non-disclosure agreement before providing the accounting
               firm access to Trubion's facilities or records. The accounting
               firm shall provide both Trubion and Wyeth a written report
               disclosing whether the certificates and invoices submitted by
               Trubion under Section 3.6.2 are correct or incorrect and the
               specific details concerning any discrepancies. No other
               information shall be provided to Wyeth. If the accounting firm
               determines that the aggregate amount of out-of-pocket expenses
               actually incurred by Trubion was less than the amount reimbursed
               by Wyeth during the period covered by the audit, Trubion shall
               refund the excess payments to Wyeth within thirty (30) days of
               its receipt of the auditor's report so concluding (or, if later,
               within fifteen (15) days after resolution of a bona fide
               objection by Trubion to the findings in such report). If the
               amount to be refunded exceeds more than ten percent (10%) of the
               amount that was properly payable, Trubion shall reimburse Wyeth
               for the cost of the audit. All information of Trubion which is
                subject to review under this Section 3.6.3 shall be deemed to be
               Confidential Information of Trubion subject to the provisions of
               Article 7, and such Confidential Information shall not be
               disclosed to any Third Party or used for any purpose other than
               verifying the information provided by Trubion to Wyeth; provided,
               however, that such Confidential Information may be disclosed to
               Third Parties only to the extent necessary to enforce Wyeth's
               rights under this Agreement, as may be necessary for Wyeth to
               exercise its rights under this Agreement, or as otherwise
               expressly permitted under this Agreement.

     3.7. DATA AND DELIVERABLES. During the Research Term, each Party will use
          Commercially Reasonable Efforts to promptly provide to the other Party
          the data or desired deliverables specified in the Research Plan,
          including, without limitation, (a) SMIPs, Recombinant DNA, and Cell
          Lines, to the


                                                                              31

<PAGE>

          extent related to Licensed Targets and/or Licensed Products, (b)
          activity evaluation of the items listed in (a) obtained from in vitro
          or in vivo assays, pharmacology studies, process development data,
          drug product formulation data, toxicology and safety studies, and
          evaluation of chemotherapy conjugates, but only to the extent and in
          the manner that items listed in (a) and (b) are set forth in the
          Research Plan. Each Party shall also disclose to the other Party in
          writing all data, information, inventions, techniques and discoveries
          (whether patentable or not) arising out of the conduct of the Research
          Program. Disclosure of all such aforementioned inventions and
          discoveries shall be delivered to the other Party in a manner mutually
          agreed upon by the Joint Patent Committee. Subject to the terms and
          conditions of this Agreement, each Party shall have the right to use
          any data or information generated under the Research Program for its
          permitted activities under the Research Program and this Agreement
          (collectively, "Research Program Data"). TRUBION MAKES NO
          REPRESENTATION OR WARRANTY, EITHER EXPRESS OR IMPLIED, THAT IT WILL BE
          ABLE TO SUCCESSFULLY DISCOVER, DEVELOP OR DELIVER ANY SMIP DIRECTED
          AGAINST A LICENSED TARGET OR ANY LICENSED PRODUCT.

     3.8. ALLIANCE MANAGERS. Each Party shall designate a single alliance
          manager, who shall perform such duties relating to the day-to-day
          worldwide coordination of the collaboration contemplated by this
          Agreement as are determined by the JRC and the JDC. Such alliance
          managers shall have experience and knowledge appropriate for managers
          with such project management responsibilities. Such alliance managers
          may attend, as non-voting members, any meetings of the committees
          contemplated by this Agreement as deemed fit by such committees. Each
          Party may change its designated alliance manager from time to time
           upon notice to the other Party.

4.    PRODUCT DEVELOPMENT, MANUFACTURING, COMMERCIALIZATION AND REGULATORY
     MATTERS.

     4.1. PRODUCT DEVELOPMENT. Except as otherwise expressly provided in
          Articles 2 and 3 hereof and in this Article 4, Wyeth shall have the
          sole authority, at its expense, for the Development of Licensed
          Products, including the initiation and conduct of clinical trials.
          Wyeth shall be responsible for the Development of and shall use its
           Commercially Reasonable Efforts to Develop Licensed Products
          throughout the Territory where it is Commercially Reasonable to do so
          (it being understood that Wyeth shall have the sole discretion to
          select those countries in which it will conduct clinical studies of
          Licensed Products and, when Commercially Reasonable to do so, to delay
          or discontinue the Development of any Licensed Product directed
          against a particular Licensed Target in favor of pursuing Development
          of another Licensed


                                                                              32

<PAGE>

          Product directed against such Licensed Target). When appropriate based
          on the data obtained during Development, Wyeth shall use its
          Commercially Reasonable Efforts to secure Regulatory Approval for
          Licensed Products in the Territory.

     4.2. TRANSFER OF PRODUCT DATA AND FILINGS. Upon Wyeth's reasonable request
          and in consultation with the JDC from time to time during the term of
          this Agreement and to the extent permitted by applicable law, Trubion
          shall assign and transfer to Wyeth Trubion's entire right, title and
          interest in and to any of the Product Data and Filings pursuant to an
          instrument to such effect in form and substance reasonably
          satisfactory to Wyeth and shall perform all other actions reasonably
          requested by Wyeth to effect and confirm such transfer. The Parties
          shall cooperate through the JDC to ensure that assignment and transfer
          of Trubion's right, title and interest in and to Product Data and
          Filings relating to CD20 Products is made in a manner that does not
          impede Trubion's activities and responsibilities under Section 4.6.
          After receipt of Wyeth's request consistent with the foregoing,
          Trubion shall provide to Wyeth, at Wyeth's expense, within sixty (60)
          days of receipt of such request, complete copies of such Product Data
          and Filings, including, without limitation, relevant clinical data,
          INDs, additional regulatory filings with FDA or other Regulatory
          Authorities, supplements or amendments thereto, all written
          correspondence with FDA or other Regulatory Authorities regarding the
          regulatory filings, and all existing written minutes of meetings and
          memoranda of conversations between Trubion (including, to the extent
          practicable, Trubion's investigators) and FDA or other Regulatory
          Authorities in Trubion's possession (or in the possession of any of
          Trubion's agents and subcontractors, such as contract research
          organizations used by Trubion), to the extent Trubion has the right to
          access and provide to Wyeth such Product Data and Filings, regarding
          such regulatory filings, each to the extent they relate to Licensed
          Products. Within thirty (30) days (or such later date as Wyeth may
          request) after the date of receipt of Wyeth's reasonable request after
          consultation with the JDC, Trubion shall execute and deliver a letter
          to the FDA or other Regulatory Authorities, in a form approved by
          Wyeth, transferring ownership to Wyeth of such regulatory filings, if
          any, filed in the name of Trubion that are related to Licensed
          Products. After such transfer of ownership of regulatory filings
          relating to a Licensed Product, during the term of this Agreement all
          regulatory filings with the FDA or other Regulatory Authorities
          pertaining to such Licensed Product shall be made in the name of
          Wyeth, in accordance with the terms of Section 4.3 below.

     4.3. REGULATORY APPROVALS. Wyeth shall have the sole authority to file, in
          its own name, at its sole expense, all Regulatory Approval
          Applications for Licensed Products. Wyeth shall have the sole
           authority and responsibility for communicating with any Regulatory
          Authority regarding any


                                                                              33

<PAGE>

          Regulatory Approval Application, or any Regulatory Approval once
          granted. To the extent necessary to satisfy applicable regulatory
          requirements with respect to the INDs for the clinical studies of CD20
          Products described in Section 4.6, Wyeth hereby grants to Trubion a
           "Right of Reference," as that term is defined in 21 C.F.R. Section
          314.3(b), to any data Controlled by Wyeth that relates to any CD20
          Products that are the subject of the clinical studies described in
          Section 4.6 hereof, and Wyeth shall provide a signed statement to this
          effect, if requested by Trubion, in accordance with 21 C.F.R. Section
          314.50(g)(3). Copies of all Wyeth regulatory filings that relate to
          Trubion's Development activities under this Agreement will be provided
          by Wyeth to Trubion upon request, subject to reasonable resource and
          time constraints.

     4.4. REGULATORY REPORTING. Wyeth shall be responsible for preparing and
          filing all reports required to be filed in order to maintain any
          Regulatory Approvals granted for Licensed Products in the Territory,
          including, without limitation, adverse drug experience reports. To the
          extent Trubion has or receives any information regarding any adverse
          drug experience which may be related to the use of any Licensed
          Product or to Licensed Product Development, Trubion shall promptly
          provide Wyeth with all such information in accordance with the Adverse
          Event Reporting and pharmacovigilance procedures set forth in Exhibit
          4.4 attached hereto (as may be amended from time to time upon written
          mutual agreement of the Parties). From time to time after the
          Effective Date, representatives from both Parties shall meet to review
          and revise or replace such Adverse Event Reporting and
          pharmacovigilance procedures.

     4.5. PROGRESS REPORTS.

               (a)   Wyeth shall provide Trubion with confidential summary
                    reports of its and its sublicensees' Development activities,
                    on a Licensed Product-by-Licensed Product basis, on a [***],
                    with respect to CD20 Products and [***], and on an [***],
                     with respect to Other Products. The form of the summary
                    reports, and the type of information and the appropriate and
                    reasonable level of detail to be included in such reports,
                    shall be mutually and reasonably agreed by the Parties;
                    provided that the Parties agree that such reports shall
                    include information regarding progress towards and
                    achievement of any event set forth in Exhibit 5.3 attached
                    hereto.

               (b)   Wyeth shall provide Trubion with confidential summary
                    reports of its and its sublicensees' CD20 Product
                    Commercialization activities on a [***] after the First
                    Commercial Sale of a CD20 Product. Beginning [***]


                                                                              34

<PAGE>

                    prior to the anticipated First Commercial Sale of a CD20
                     Product, and thereafter on a [***], Wyeth shall meet with
                    Trubion and provide updates on CD20 Product
                    Commercialization activities.

               (C)   Wyeth shall provide Trubion with confidential summary
                    reports of its and its sublicensees' [***] Commercialization
                    activities on a [***] after the First Commercial Sale of a
                    [***]. Beginning [***] prior to the anticipated First
                     Commercial Sale of a [***], and thereafter on a [***], Wyeth
                    shall meet with Trubion and provide updates on [***]
                    Commercialization activities.

               (D)   Wyeth shall provide Trubion with confidential summary
                    reports of its and its sublicensees' Other Product
                    Commercialization activities on an [***] after the First
                    Commercial Sale of an Other Product. Beginning [***] prior
                    to the anticipated First Commercial Sale of an Other
                    Product, and thereafter on an [***], Wyeth shall meet with
                    Trubion and provide updates on Other Product
                    Commercialization activities.

                (E)   The meetings described in clauses (b) - (d) above shall be
                    coordinated to occur at the same time, to the extent
                    practicable.

     4.6. CD20 PRODUCT DEVELOPMENT. Subject to Section 4.7 hereof, Trubion shall
          use its Commercially Reasonable Efforts to conduct the following
          Development activities for CD20 Products: (a) Trubion shall continue
          the Phase I Clinical Studies and Phase IIa Clinical Studies of TRU-015
          ongoing at the Effective Date for treatment of rheumatoid arthritis
          until completion or termination of such studies, including the
          re-treatment periods of such studies; (b) Trubion shall initiate and
          perform the planned Phase IIb Clinical Study of TRU-015 for treatment
          of rheumatoid arthritis through the completion or termination of such
          study; (c) Trubion shall continue the Phase I Clinical Study ongoing
          at the Effective Date, and shall initiate and perform the planned
          Phase III Clinical Studies (or the appropriate subsequent clinical
          study) of TRU-015 for the treatment of [***] through the completion or
          termination of such studies; (d) Trubion shall have responsibility for
           and shall perform the clinical studies for at least two (2) additional
          Niche Indications selected by the Parties and set forth in the
          Development Plan; and (e) Trubion shall continue to perform the
          ongoing bioprocess development activities, and in each case (a-e) such
          activities and responsibilities of Trubion shall be performed in
          accordance with the Development Plan. None of the clinical studies
          described in this Section 4.6 shall be terminated prior to completion
          before discussion of


                                                                              35

<PAGE>

          such matter by the JDC. Trubion shall keep accurate records of its
          clinical study activities under this Section 4.6 in accordance with
          applicable laws and, upon reasonable request, shall provide Wyeth with
          access to such records. Trubion shall maintain such records for a
          period of at least three (3) years after the end of the calendar year
          in which they were generated. The Development Plan shall provide that
          Trubion is responsible for conducting the clinical trials for
          rheumatoid arthritis, [***] and additional Niche Indications through
          the completion or termination of such clinical studies described above
          and shall contain a budget for such clinical trials. Trubion shall be
          solely responsible for its internal FTE and other internal costs for
          such Development activities, but Wyeth shall reimburse Trubion for all
          out-of-pocket costs incurred by Trubion in connection with the
          foregoing Development activities in accordance with the budget
          contained in the Development Plan (which shall include, without
          limitation, all expenses paid to one or more contract research
          organizations for such Development activities). Trubion shall provide
          to Wyeth, on or before the first day of each Calendar Quarter, a
          forecast of such out-of-pocket costs (by major expense category, on an
          accrual basis) reimbursable under this Section 4.6 that Trubion
          expects to incur during such Calendar Quarter and the subsequent three
          (3) Calendar Quarters, in each case shown by month. Reimbursement to
          be made to Trubion by Wyeth pursuant to this Section 4.6 will be made
          pursuant to invoices submitted by Trubion to Wyeth no more often than
          once with respect to any Calendar Quarter, within forty-five (45) days
          of the end of such Calendar Quarter. Payment shall be due within
          forty-five (45) days after Wyeth receives such an invoice from
          Trubion. Each invoice must be accompanied by supporting documentation
          sufficiently demonstrating the expense so incurred (such as receipts
          for out-of-pocket expenses). The provisions of Section 3.6.3 shall
          apply to the expenses reimbursable by Wyeth under this Section 4.6 in
          the same manner as they apply to expenses reimbursable under Section
          3.6.1.

     4.7. JOINT DEVELOPMENT COMMITTEE. Within thirty (30) days of the Effective
          Date, Wyeth and Trubion shall establish a CD20 Product Joint
           Development Committee (the "JDC"), comprised of appropriate
          representatives of both Parties, to review and provide input to Wyeth
          regarding CD20 Product Development in the Territory, including the
          strategic direction of the overall CD20 Product Development program.
          Wyeth shall consider in good faith any of Trubion JDC members'
          comments and recommendations regarding CD20 Product Development, but
          Wyeth shall have final decision-making authority with respect to how
          the Parties proceed with CD20 Product Development, subject to Wyeth's
          obligations under Section 4.1 in connection therewith. If Trubion
          disagrees with an action or decision by the JDC, Trubion may express
           its concerns through good faith discussions between the Executive
          Officers of Trubion and Wyeth, with Wyeth Research's President having
          the final


                                                                              36

<PAGE>

          decision-making authority with respect to such matter. For the
          avoidance of doubt, the JDC may not impose different or greater CD20
          Product Development obligations on Trubion than those specified in
          Section 4.6.

     4.8. JOINT PROJECT TEAM; DEVELOPMENT PLAN. Trubion and Wyeth shall form a
          Joint Project Team ("JPT") comprised of appropriate representatives of
          both Parties to plan and implement the CD20 Product Development
          activities in accordance with the Development Plan. The JPT shall
          report to the JDC. If the JPT cannot promptly resolve a disagreement
          or a voting deadlock regarding the CD20 Product Development
          activities, the matter shall be brought before the JDC for resolution.
          Wyeth shall prepare the Development Plan with input and advice from
          Trubion through the JPT. The Development Plan will define each Party's
          roles and responsibilities, provide a mechanism to coordinate each
          Party's and/or joint activities, and provide a process for monthly
          meetings of the JPT to monitor and report on all activities of the
          Parties conducted under the Development Plan. The Development Plan
          shall not impose different or greater CD20 Product Development
          obligations on Trubion than those specified in Section 4.6. The
          Development Plan shall be updated annually by the JPT.

     4.9. MANUFACTURING. Wyeth shall have the exclusive right to Manufacture
          Licensed Products itself or through one or more Third Parties selected
          by Wyeth; provided, however, that Trubion shall use its Commercially
          Reasonable Efforts to Manufacture and supply Wyeth with its
           requirements of the TRU-015 Product in accordance with the Development
          Plan under Trubion's existing contract Manufacturing arrangements for
          use in pre-clinical studies and clinical trials ("Clinical Study
          Supplies"); provided that Trubion cannot guarantee as of the Effective
          Date that it will be able to Manufacture and supply such requirements.
          Wyeth shall reimburse Trubion for its direct out-of-pocket cost of
          Clinical Study Supplies, including, without limitation, out-of-pocket
          expenses incurred by Trubion prior to the Effective Date that are
          directly related to the Manufacture, testing and release of Clinical
          Study Supplies to be used after the Effective Date (such pre-Effective
          Date out-of-pocket expenses not to exceed [***]. Reimbursement of such
          pre-Effective Date expenses shall be due within thirty (30) days after
          the first patient is dosed in the first Phase IIb Clinical Study for
          rheumatoid arthritis using such Clinical Study Supplies. Upon Wyeth's
          written request, Trubion shall provide reasonable assistance to Wyeth,
          until the first cGMP batch of TRU-015 Product is Manufactured in a
          Wyeth facility (or the facility of a Third Party designated by Wyeth),
          in support and facilitation of Wyeth's efforts to Manufacture TRU-015
          Products and to secure appropriate TRU-015 Product Manufacturing
          arrangements with Third Parties. Such assistance shall be at no cost
          to Wyeth; provided that Wyeth shall reimburse Trubion for all of its
          reasonable out-of-pocket expenses related thereto. If applicable, upon
          Wyeth's written request,


                                                                               37

<PAGE>

          Trubion shall assign or otherwise transfer to Wyeth (to the extent
          allowable under such agreements) its TRU-015 Product Manufacturing
          agreements with Third Parties.

     4.10. COMMERCIALIZATION. Subject to the terms and conditions of this
          Agreement, Wyeth shall have the sole authority and the exclusive right
          to Commercialize Licensed Products itself or through one or more Third
           Parties selected by Wyeth and shall have sole authority and
          responsibility in all matters relating to the Commercialization of
          Licensed Products. Wyeth shall use Commercially Reasonable Efforts to
          Commercialize Licensed Products in the Territory in each country where
          Wyeth has obtained Regulatory Approval for such Licensed Product(s)
          and for each indication of such Licensed Product(s) for which
          Regulatory Approval has been obtained in such country.

     4.11. CO-PROMOTION OPTION. Subject to the foregoing, in the event of a BLA
          filing with the FDA for Regulatory Approval of a CD20 Product for a
          Niche Indication in the United States, Trubion shall have the option
           to Co-Promote the CD20 Product in the United States for such Niche
          Indication in accordance with Wyeth's marketing plan for up to five
          (5) years after the First Commercial Sale of the first CD20 Product
          for any Niche Indication in the United States (the "Co-Promotion
          Period"). The Trubion Co-Promotion option shall be exercisable by
          Trubion giving written notice to Wyeth no later than [***] after the
          date of the first BLA filing with the FDA for the first Niche
          Indication for the first CD20 Product (or such longer time as the
          Parties may mutually agree). Promptly after Trubion's exercise of such
          option, the Parties shall negotiate,


 
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