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                                                                   EXHIBIT 10.58
                                                                  EXECUTION COPY






             SUBSCRIPTION, JOINT DEVELOPMENT AND OPERATING AGREEMENT



                              ELAN CORPORATION, PLC



                        ELAN INTERNATIONAL SERVICES, LTD.



                                       AND



                          CELTRIX PHARMACEUTICALS INC.



                                       AND



                               CELTRIX NEWCO LTD.






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                                      INDEX


CLAUSE 1  DEFINITIONS

CLAUSE 2  NEWCO'S BUSINESS

CLAUSE 3  REPRESENTATIONS AND WARRANTIES

CLAUSE 4  AUTHORIZATION AND CLOSING

CLAUSE 5  DEVELOPMENT FUNDING

CLAUSE 6  SUBLICENSE AND ASSIGNMENT RIGHTS

CLAUSE 7  OWNERSHIP OF INTELLECTUAL PROPERTY RIGHTS/NONCOMPETITION

CLAUSE 8  TRADEMARKS

CLAUSE 9  DIRECTORS; MANAGEMENT AND R&D COMMITTEES

CLAUSE 10 THE BUSINESS PLAN AND REVIEWS

CLAUSE 11 RESEARCH AND DEVELOPMENT

CLAUSE 12 INTELLECTUAL PROPERTY RIGHTS

CLAUSE 13 COMMERCIALIZATION

CLAUSE 14 MANUFACTURING

CLAUSE 15 TECHNICAL SERVICES AND ASSISTANCE

CLAUSE 16 AUDITORS, BANKERS, REGISTERED OFFICE,
          ACCOUNTING REFERENCE DATE; SECRETARY; COUNSEL

CLAUSE 17 REGULATORY

CLAUSE 18 TRANSFER OF SHARES; RIGHTS OF FIRST OFFER; TAG ALONG RIGHTS

CLAUSE 19 MATTERS REQUIRING PARTICIPANTS' APPROVAL

CLAUSE 20 DISPUTES



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CLAUSE 21 TERMINATION

CLAUSE 22 INTENTIONALLY OMITTED

CLAUSE 23 CONFIDENTIALITY

CLAUSE 24 COSTS

CLAUSE 25 GENERAL



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THIS SUBSCRIPTION, JOINT DEVELOPMENT AND OPERATING AGREEMENT made this 21st day
of April, 1999

among:

(1)      ELAN CORPORATION, PLC, a public limited company incorporated under the
         laws of Ireland, and having its registered office at Lincoln House,
         Lincoln Place, Dublin 2, Ireland ("ELAN");

(2)      ELAN INTERNATIONAL SERVICES, LTD., an exempted company incorporated
         under the laws of Bermuda, and having its registered office at
         Clarendon House, 2 Church St., Hamilton, Bermuda ("EIS");

(3)      CELTRIX PHARMACEUTICALS INC. a corporation duly incorporated and
         validly existing under the laws of Delaware, and having its principal
         place of business at 2033 Gateway Place, Suite 600, San Jose,
         California 95110, United States of America ("CELTRIX"); and

(4)      CELTRIX NEWCO LTD. an exempted company incorporated under the laws of
         Bermuda, and having its registered office at Clarendon House, 2 Church
         St., Hamilton, Bermuda ("NEWCO").

                                   RECITALS:

A.       Newco desires to issue and sell to the Participants (as defined below),
         and the Participants desire to purchase from Newco, for aggregate
         consideration of [*****], apportioned between them as set forth herein,
         [*****] ordinary shares (the "SHARES") of Newco's common stock, par
         value $1.00 per share (the "COMMON STOCK"), allocated [*****] shares to
         Celtrix and [*****] shares to EIS.

B.       Elan owns all right, title and interest in and to certain patents which
         have been granted or are pending in relation to the MEDIPAD(R) Drug
         Delivery System.

C.       Celtrix owns all right, title and interest in and to certain patents
         that have been granted or are pending in relation to SomatoKine(R).

D.       As of the date hereof, Elan has entered into a license agreement with
         Newco, and Celtrix has entered into a license agreement with Newco, in
         connection with the license to Newco of the Elan Intellectual Property
         and the Celtrix Intellectual Property, respectively (each as defined
         below).

E.       Elan and Celtrix have agreed to co-operate in the establishment and
         management of a business for the research, development and
         commercialization of the Products (as defined below) based on the
         Licensed Technologies (as defined below).



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F.       Elan and Celtrix have agreed to enter into this Agreement for the
         purpose of recording the terms and conditions of the joint venture and
         of regulating their relationship with each other and certain aspects of
         the affairs of and their dealings with Newco.

NOW IT IS HEREBY AGREED AS FOLLOWS:

                                    CLAUSE 1

                                   DEFINITIONS

1.1      In this Agreement, the following terms shall, where not inconsistent
         with the context, have the following meanings respectively.

         "AFFILIATE" of any Person (in the case of a legal entity) shall mean
         any other Person controlling, controlled by or under the common control
         with such first Person, as the case may be. For the purposes of this
         definition, "control" shall mean direct or indirect ownership of 50% or
         more of the stock or shares entitled to vote for the election of
         directors or capital interests representing at least 50% of the equity
         thereof and "controlling" and "controlled" shall be construed
         accordingly. Notwithstanding the foregoing, Newco shall not be
         construed to be an Affiliate, as defined herein, of Elan or EIS.

         "AGREEMENT" means this agreement (which expression shall be deemed to
         include the Recitals and the Schedules hereto).

         "BUSINESS" means the business of Newco as described in Clause 2 and as
         more particularly specified in the Business Plan and such other
         business as the Participants may agree from time to time in writing
         (each in its sole discretion) should be carried on by Newco.

         "BUSINESS PLAN" shall mean the business plan and program of development
         to be agreed to by Elan and Celtrix within 60 days of the Closing Date,
         with respect to the research, development, and commercialization of the
         Products, which shall be reviewed and updated by Elan and Celtrix on an
         annual basis, upon mutual written agreement.

         "CELTRIX DIRECTORS" has the meaning set forth in Clause 7.

         "CELTRIX IMPROVEMENTS" has the meaning assigned thereto in the Celtrix
         License Agreement.

         "CELTRIX INTELLECTUAL PROPERTY" has the meaning assigned thereto in the
         Celtrix License Agreement.




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         "CELTRIX KNOW-HOW" shall mean any and all rights owned or licensed by
         Celtrix with respect to any knowledge, information, discovery,
         invention, trade secret, technique, process, system, formulation,
         design, data and expertise relating to SomatoKine(R) whether or not
         covered by any patent, copyright, design, trademark, trade secret or
         other industrial or intellectual property right.

         "CELTRIX LICENSE AGREEMENT" means the license agreement between Celtrix
         and Newco, of even date herewith, attached hereto in Schedule 2.

         "CELTRIX PATENT RIGHTS" shall mean the patents and patent applications
         (including provisional applications) relating to SomatoKine(R) that are
         forth in Schedule 1 of the Celtrix License Agreement, that are owned or
         licensed by or on behalf of Celtrix. Celtrix Patent Rights shall also
         include all extensions, continuations, continuations-in-part,
         divisionals, patents-of-addition, re-examinations, re-issues,
         supplementary protection certificates and foreign counterparts of such
         patents and patent applications and any patents issuing thereon and
         extensions of any patents licensed under the Celtrix License Agreement.

         "CELTRIX SECURITIES PURCHASE AGREEMENT" means that certain securities
         purchase agreement, of even date herewith, by and between Celtrix and
         EIS.

         "CLOSING DATE" shall mean the date upon which the Transaction Documents
         are executed and delivered by the Parties and the transactions effected
         thereby are closed.

         "COMMON STOCK EQUIVALENTS" means any options, warrants, rights or any
         other securities convertible, exercisable or exchangeable, in whole or
         in part, for or into Common Stock.

         "DIRECTORS" means, at any time, the directors of Newco.

         "EIS DIRECTOR" has the meaning set forth in Clause 9.

         "ELAN IMPROVEMENTS" has the meaning assigned thereto in the Elan
         License Agreement.

         "ELAN INTELLECTUAL PROPERTY" has the meaning assigned thereto in the
         Elan License Agreement.



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         "ELAN KNOW-HOW" shall mean any and all rights owned or licensed by Elan
         relating to any knowledge, information, discovery, invention, trade
         secret, technique, process, system, formulation, design, data and
         expertise with respect to the MEDIPAD(R) Drug Delivery System whether
         or not covered by any patent, copyright, design, trademark, trade
         secret or other industrial or intellectual property right.

         "ELAN LICENSE AGREEMENT" means the license agreement between Elan and
         Newco, of even date herewith, attached hereto in Schedule 1.

         "ELAN PATENT RIGHTS" shall mean the patents and patent applications
         (including provisional applications) relating to the MEDIPAD(R) Drug
         Delivery System as set forth in Schedule 1 of the Elan License
         Agreement, and that are owned or licensed by or on behalf of Elan. Elan
         Patent Rights shall also include all extensions, continuations,
         continuations-in-part, divisionals, patents-of-addition,
         re-examinations, re-issues, supplementary protection certificates and
         foreign counterparts of such patents and patent applications and any
         patents issuing thereon and extensions of any patents licensed under
         the Elan License Agreement.

         "ENCUMBRANCE" means any liens, charges, encumbrances, equities, claims,
         options, proxies, pledges, security interests, or other similar rights
         of any nature.

         "EPT" shall mean Elan Pharmaceutical Technologies, a division of Elan.

         "EXCHANGE RIGHT" has the meaning assigned to such term in the Amended
         and Restated Certificate of Incorporation of Celtrix in effect on the
         date hereof.

         "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

         "EXCHANGE RIGHT TERM" shall mean the period commencing on the Effective
         Date and ending on the exercise by Elan of the Exchange Right.

         "FIELD" shall mean [*****]

         "FINANCIAL YEAR" means each year commencing on January 1 (or in the
         case of the first Financial Year, the date hereof) and expiring on
         December 31 of each year.

        "FULLY DILUTED COMMON STOCK" means all of the issued and outstanding
        Common Stock, assuming the conversion, exercise or exchange of all
        outstanding Common Stock Equivalents.




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         "FUNDING AGREEMENT" shall mean the Funding Agreement, dated as of the
         date hereof, between EIS and Celtrix.

         "LICENSE AGREEMENTS" means the Elan License Agreement and the Celtrix
         License Agreement.

         "LICENSED TECHNOLOGIES" means, collectively, the Elan Intellectual
         Property and the Celtrix Intellectual Property.

         "MEDIPAD(R) DRUG DELIVERY SYSTEM" shall mean the [*****] as disclosed
         in the Elan Patent Rights set forth in Schedule 1 of the Elan License
         Agreement.

         "NEWCO INTELLECTUAL PROPERTY" shall mean all rights to technology,
         patents and know-how belonging to Newco, other than the Elan
         Intellectual Property and the Celtrix Intellectual Property, including
         any technology acquired by or licensed to Newco from or by a third
         party and any newly developed technology that is not Elan Intellectual
         Property or Celtrix Intellectual Property.

         "NEWCO MEMORANDUM OF ASSOCIATION AND BYE-LAWS" shall mean the
         Memorandum of Association and Bye-Laws of Newco.

         "OSTEOPOROSIS" shall mean a skeletal condition characterized by
         decreased density of normal mineralized bone, which bone density, as
         measured by dual-energy x-ray absorptiometry (DXA), is more than 2.5
         standard deviations below the mean for the young adult reference range.

         "PARTICIPANT" means Celtrix or Elan, as the case may be, and
         "PARTICIPANTS" means both Celtrix and Elan together;

         "PARTY" means Elan, Celtrix, or Newco, as the case may be, and
         "PARTIES" means all three together;

         "PERSON" means an individual, partnership, corporation, limited
         liability company, business trust, joint stock company, trust,
         unincorporated association, joint venture, governmental entity or
         authority or other entity of whatever nature.

         "PERMITTED TRANSFEREE" means any Affiliate or subsidiary of Elan, EIS
         or Celtrix, to whom this Agreement may be assigned, in whole or in
         part, pursuant to



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         the terms hereof or, in the case of Elan/EIS, an off-balance sheet
         special purpose entity created by Elan or EIS.

         "PRODUCTS" shall mean the MEDIPAD(R) Drug Delivery System incorporating
         SomatoKine(R) as its primary active ingredient.

         "PROJECT" shall mean all activity as undertaken by or on behalf of
         Newco in order to develop the Products in accordance with the Business
         Plan.

         "REGISTRATION RIGHTS AGREEMENTS" means the Registration Rights
         Agreements of even date herewith relating to Newco and Celtrix,
         respectively.

         "REGULATORY APPLICATION" means any regulatory application or any other
         application for marketing approval for a Product, which Newco will file
         in any country of the Territory, including any supplements or
         amendments thereto.

         "REGULATORY APPROVAL" means the final regulatory approval to market a
         Product in any country of the Territory, and any other approval which
         is required to launch the Product in the normal course of business.

         "RHA" means any relevant government health authority (or successor
         agency thereof) in any country of the Territory whose approval is
         necessary to market a Product in the relevant country of the Territory.

         "SECURITIES ACT" means the Securities Act of 1933, as amended.

         "SHARES" means the shares of Common Stock of Newco.

         "SOMATOKINE"(R) shall mean [*****]

         "STOCKHOLDER" means any of EIS, Celtrix, any Permitted Transferee or
         any other Person who subsequently becomes bound by this Agreement as a
         holder of the Shares, and "STOCKHOLDERS" means all of the Stockholders
         together.

         "SUBSIDIARY" means any company that is a subsidiary of Newco within the
         meaning of applicable laws.

         "TECHNOLOGICAL COMPETITOR OF ELAN" shall mean [*****]



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         "TECHNOLOGICAL COMPETITOR OF CELTRIX" shall mean [*****]

         "TERM" means the term of this Agreement.

         "TERRITORY" means [*****]

         "TRANSACTION DOCUMENTS" means this Agreement, the Funding Agreement,
         the Elan License Agreement, the Celtrix License Agreement, the Celtrix
         Securities Purchase Agreement, the Registration Rights Agreements and
         associated documentation of even date herewith, by and between Celtrix,
         Elan, EIS and Newco, as applicable.

         "UNITED STATES DOLLAR" and "US$" and "$" means the lawful currency of
         the United States of America.

1.2      In addition, the following definitions have the meanings in the Clauses
         corresponding thereto, as set forth below.



        DEFINITION                             CLAUSE
        ----------                             ------
                                            
        "Buyout Option"                        21.4
        "Closing"                              4.2
        "Common Stock"                         Recital
        "Confidential Information"             23.1
        "Co-sale Notice"                       18.3
        "Elan/Newco Option"                    13.2
        "Expert"                               20.3
        "Management Committee"                 9.2.1
        "Notice of Exercise"                   18.2
        "Notice of Intention"                  18.2
        "Offered Shares"                       18.2
        "Offering Price"                       18.2
        "Presiding Justice"                    20.3
        "Proposing Participant"                21.4
        "Proposing Participant Price"          21.6
        "Purchase Price"                       21.6
        "R&D Committee"                        9.2.2
        "Recipient Participant"                21.4
        "Recipient Participant Price"          21.6
        "Remaining Stockholders"               18.3




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        DEFINITION                             CLAUSE
        ----------                             ------
                                            
        "Relevant Event"                       21.2
        "Selling Stockholder"                  18.2
        "Tag-Along Right"                      18.3
        "Transaction Proposal"                 18.2
        "Transfer"                             18.1
        "Transferee Terms"                     18.3
        "Transferring Stockholders"            18.3


1.3      Words importing the singular shall include the plural and vice versa.

1.4      Unless the context otherwise requires, reference to a recital, article,
         paragraph, provision, clause or schedule is to a recital, article,
         paragraph, provision, clause or schedule of or to this Agreement.

1.5      Reference to a statute or statutory provision includes a reference to
         it as from time to time amended, extended or re-enacted.

1.6      The headings in this Agreement are inserted for convenience only and do
         not affect its construction.

1.7      Unless the context or subject otherwise requires, references to words
         in one gender include references to the other genders.

1.8      Capitalized terms used but not defined herein shall have the meanings
         ascribed in the Transaction Documents, if defined therein.

                                    CLAUSE 2

                                NEWCO'S BUSINESS

2.1      The primary objective of Newco and any Subsidiaries is to carry on the
         business of the development, testing, registration, manufacture,
         commercialization and licensing of Products in the Territory and to
         achieve the objectives set out in this Agreement. The focus of the
         collaborative venture will be to develop the Products using the Elan
         Intellectual Property, the Celtrix Intellectual Property and the Newco
         Intellectual Property in accordance with agreed-upon specifications and
         timelines.

2.2      Except as the Participants otherwise agree in writing and except as may
         be provided in this Agreement, the Business Plan or the License
         Agreements, the Participants shall exercise their respective powers in
         relation to Newco so as to ensure that the Business is carried on in a
         proper and prudent manner.





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2.3      Each Participant shall use all commercially reasonable and proper means
         at its disposal and within its power to maintain, extend and improve
         the Business of Newco, within the limits of this Agreement, and to
         further the reputation and interests of Newco.

2.4      The central management and control of Newco shall be exercised in
         Bermuda and shall be vested in the Directors and such Persons as such
         Directors may delegate the exercise of their powers in accordance with
         the Newco Memorandum of Association and Bye-Laws. The Participants
         shall use their best efforts to ensure that to the extent required
         pursuant to the laws of Bermuda, and to ensure the sole residence of
         Newco in Bermuda, all meetings of the Directors are held in Bermuda or
         other jurisdictions outside the United States and generally to ensure
         that Newco is treated as resident for taxation purposes in Bermuda.

                                    CLAUSE 3

                         REPRESENTATIONS AND WARRANTIES

3.1      REPRESENTATIONS AND WARRANTIES OF NEWCO: Newco hereby represents and
         warrants to each of the Stockholders as follows, as of the date hereof:

         3.1.1    ORGANIZATION: Newco is an exempted company duly organized,
                  validly existing and in good standing under the laws of
                  Bermuda, and has all the requisite corporate power and
                  authority to own and lease its properties, to carry on its
                  business as presently conducted and as proposed to be
                  conducted, to execute this Agreement, which has been duly
                  authorized and is enforceable against Newco in accordance with
                  its terms, and to carry out the transactions contemplated
                  hereby.

         3.1.2    CAPITALIZATION: As of the date hereof, the authorized capital
                  stock of Newco consists of [*****] shares of Common Stock.
                  Prior to the date hereof, no shares of capital stock of Newco
                  have been issued.

         3.1.3    AUTHORIZATION: The execution, delivery and performance by
                  Newco of this Agreement, including the issuance of the Shares,
                  have been duly authorized by all requisite corporate actions;
                  this Agreement has been duly executed and delivered by Newco
                  and is the valid and binding obligation of Newco, enforceable
                  against it in accordance with its terms except as limited by
                  applicable bankruptcy, insolvency, reorganization, moratorium
                  and other laws of general application affecting the
                  enforcement of creditors' rights generally, and except as
                  enforcement of rights to





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                  indemnity and contribution hereunder may be limited by United
                  States federal or state securities laws or principles of
                  public policy. The Shares, when issued as contemplated hereby,
                  will be validly issued and outstanding, fully paid and
                  non-assessable and not subject to preemptive or any other
                  similar rights of the Stockholders or others.

         3.1.4    NO CONFLICTS: The execution, delivery and performance by Newco
                  of this Agreement, the issuance, sale and delivery of the
                  Shares, and compliance with the provisions hereof by Newco,
                  will not:

                  (i)      violate any provision of applicable law, statute,
                           rule or regulation applicable to Newco or any ruling,
                           writ, injunction, order, judgment or decree of any
                           court, arbitrator, administrative agency or other
                           governmental body applicable to Newco or any of its
                           properties or assets;

                  (ii)     conflict with or result in any breach of any of the
                           terms, conditions or provisions of, or constitute
                           (with notice or lapse of time or both) a default (or
                           give rise to any right of termination, cancellation
                           or acceleration) under its charter or organizational
                           documents or any material contract to which Newco is
                           a party, except where such violation, conflict or
                           breach would not, individually or in the aggregate,
                           have a material adverse effect on Newco; or

                  (iii)    result in the creation of, any Encumbrance upon any
                           of the properties or assets of Newco.

         3.1.5    APPROVALS: As of the date hereof, no permit, authorization,
                  consent or approval of or by, or any notification of or filing
                  with, any Person is required in connection with the execution,
                  delivery or performance of this Agreement by Newco. Newco has
                  full authority to conduct its business as contemplated in the
                  Business Plan and the Transaction Documents.

         3.1.6    DISCLOSURE: This Agreement does not contain any untrue
                  statement of a material fact or omit to state any material
                  fact necessary to make the statements contained herein not
                  misleading. Newco is not aware of any material contingency,
                  event or circumstance relating to its business or prospects,
                  which could have a material adverse effect thereon, in order
                  for the disclosure herein relating to Newco not to be
                  misleading in any material respect.




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        3.1.7   NO BUSINESS; NO LIABILITIES: Newco has not conducted any
                business or incurred any liabilities or obligations prior to the
                date hereof, except solely in connection with its organization
                and formation.

3.2      REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDERS: Each of the
         Stockholders hereby severally represents and warrants to Newco as
         follows as of the date hereof:

         3.2.1    ORGANIZATION: Such Stockholder is a corporation duly organized
                  and validly existing under the laws of its jurisdiction of
                  organization and has all the requisite corporate power and
                  authority to own and lease its respective properties, to carry
                  on its respective business as presently conducted and as
                  proposed to be conducted and to carry out the transactions
                  contemplated hereby.

         3.2.2    AUTHORITY: Such Stockholder has full legal right, power and
                  authority to enter into this Agreement and to perform its
                  obligations hereunder, which have been duly authorized by all
                  requisite corporate action. This Agreement is the valid and
                  binding obligation of such Stockholder, enforceable against it
                  in accordance with its terms except as limited by applicable
                  bankruptcy, insolvency, reorganization, moratorium and other
                  laws of general application affecting the enforcement of
                  creditors' rights generally, and except as enforcement of
                  rights to indemnity and contribution hereunder may be limited
                  by United States federal or state securities laws or
                  principles of public policy.

         3.2.3    NO CONFLICTS: The execution, delivery and performance by such
                  Stockholder of this Agreement, purchase of the Shares, and
                  compliance with the provisions hereof by such Stockholder will
                  not:

                  (i)      violate any provision of applicable law, statute,
                           rule or regulation known by and applicable to such
                           Stockholder or any ruling, writ, injunction, order,
                           judgment or decree of any court, arbitrator,
                           administrative agency or other governmental body
                           applicable to such Stockholder or any of its
                           properties or assets;

                  (ii)     conflict with or result in any breach of any of the
                           terms, conditions or provisions of, or constitute
                           (with notice or lapse of time or both) a default (or
                           give rise to any right of termination, cancellation
                           or acceleration) under the charter or organizational
                           documents of such Stockholder or any material
                           contract to which such Stockholder is a party, except
                           where such violation, conflict or breach would not,




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                           individually or in the aggregate, have a material
                           adverse effect on such Stockholder; or

                  (iii)    result in the creation of, any Encumbrance upon any
                           of the properties or assets of such Stockholder.

         3.2.4    APPROVALS: As of the date hereof, no permit, authorization,
                  consent or approval of or by, or any notification of or filing
                  with, any Person is required in connection with the execution,
                  delivery or performance of this Agreement by such Stockholder.

         3.2.5    INVESTMENT REPRESENTATIONS: Such Stockholder is capable of
                  evaluating the merits and risks of its investment in Newco.
                  Such Stockholder has not been formed solely for the purpose of
                  making this investment and such Stockholder is acquiring the
                  Common Stock and Preferred Stock for investment for its own
                  account, not as a nominee or agent, and not with the view to,
                  or for resale in connection with, any distribution of any part
                  thereof. Such Stockholder understands that the Shares have not
                  been registered under the Securities Act or applicable state
                  and foreign securities laws by reason of a specific exemption
                  from the registration provisions of the Securities Act and
                  applicable state and foreign securities laws, the availability
                  of which depends upon, among other things, the bona fide
                  nature of the investment intent and the accuracy of such
                  Stockholders' representations as expressed herein. Such
                  Stockholder understands that no public market now exists for
                  any of the Shares and that there is no assurance that a public
                  market will ever exist for such Shares.

                                    CLAUSE 4

                            AUTHORIZATION AND CLOSING

4.1      Newco has authorized the issuance to (i) EIS of [*****] shares of
         Common Stock and (ii) Celtrix of [*****] shares of Common Stock,
         issuable as provided in Clause 4.3 hereof.

4.2      The closing (the "CLOSING") shall take place at the offices of Brock
         Silverstein LLC at 153 East 53rd Street, New York, New York 10022 on
         the date hereof or such other places if any, as the Parties may agree
         and shall occur contemporaneously with the closing under the Celtrix
         Securities Purchase Agreement.

4.3      At the Closing:




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         4.3.1    Newco shall issue and sell to EIS, and EIS shall purchase from
                  Newco, upon the terms and subject to the conditions set forth
                  herein, [*****] shares of Common Stock for an aggregate
                  purchase price of [*****] Newco shall issue and sell to
                  Celtrix, and Celtrix shall purchase from Newco, upon the terms
                  and conditions set forth herein, [*****] shares of Common
                  Stock for an aggregate purchase price of [*****]

         4.3.2    The Parties shall execute and deliver to each other, as
                  applicable, certificates in respect of the Common Stock
                  described above and any other certificates, resolutions or
                  documents which the Parties shall reasonably require.

4.4      EXEMPTION FROM REGISTRATION:

         The Shares will be issued under an exemption or exemptions from
         registration under the Securities Act. Accordingly, the certificates
         evidencing the Shares shall, upon issuance, contain the following
         legend:

         THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE
         SECURITIES ACT OF 1933, AS AMENDED, OR ANY SECURITIES LAWS OF A STATE
         OR OTHER JURISDICTION AND MAY NOT UNDER ANY CIRCUMSTANCES BE SOLD,
         TRANSFERRED, OR OTHERWISE DISPOSED OF (OTHER THAN TO AN AFFILIATE OF
         THE ORIGINAL HOLDER OR AS OTHERWISE PERMITTED IN THE AGREEMENT PURSUANT
         TO WHICH THEY WERE ISSUED) EXCEPT PURSUANT TO (i) AN EFFECTIVE
         REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND ANY APPLICABLE
         STATE SECURITIES OR BLUE SKY LAWS, OR (ii) TO THE EXTENT APPLICABLE,
         RULE 144 UNDER THE SECURITIES ACT (OR ANY SIMILAR RULE UNDER THE
         SECURITIES ACT RELATING TO THE DISPOSITION OF SECURITIES) TOGETHER WITH
         AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE CORPORATION THAT
         REGISTRATION IS NOT REQUIRED UNDER SUCH ACT OR APPLICABLE STATE
         SECURITIES LAWS.




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                                    CLAUSE 5

                               DEVELOPMENT FUNDING

It is estimated that Newco will require approximately an additional [*****] (the
"DEVELOPMENT FUNDING") within the first [*****] of the date hereof, to commence
development of the first Product or Products based upon the Elan Technology, the
Celtrix Technology and/or Newco Technology. The funds necessary for such
development shall be provided in accordance with the Participants' respective
ownership in Newco at such time or times as shall be reasonably determined in
good faith by decision of Newco's board of directors with the affirmative vote
of at least the EIS Director and one Celtrix Director, pursuant to the terms and
conditions of the Funding Agreement.

                                    CLAUSE 6

                        SUBLICENSE AND ASSIGNMENT RIGHTS

6.1      Newco shall not assign or, except as set forth in Section 6.2 below,
         otherwise transfer any of its rights under the Licenses for the
         Licensed Technologies and/or the Newco Intellectual Property without
         the prior written consent of Elan and Celtrix.

6.2      Newco shall not sublicense any of its rights under the Licenses for the
         Licensed Technologies and/or the Newco Intellectual Property without
         the prior written consent of Elan and Celtrix, which consent shall not
         be unreasonably withheld or delayed; provided, that the consent of Elan
         and/or Celtrix may be withheld in Elan's or Celtrix's sole discretion
         in the case of a proposed sublicense of such rights to a Technological
         Competitor of Elan or a Technological Competitor of Celtrix, as the
         case may be.

6.3      Newco shall not enter into any agreement with any third party for
         development or exploitation of the Elan Intellectual Property and/or
         the Celtrix Intellectual Property without the prior written consent of
         Elan or Celtrix, respectively, which consent may be withheld in Elan's
         or Celtrix's sole discretion, as the case may be. Any agreement between
         Newco and any permitted third party for the development or exploitation
         of the Elan Intellectual Property and/or the Celtrix Intellectual
         Property shall require such third party to maintain the confidentiality
         of all information concerning the Elan Intellectual Property and/or the
         Celtrix Intellectual Property, as applicable, provided that such
         obligation of confidentiality shall be no less stringent than that set
         forth in Clause 23 and shall provide that all right, title and interest
         in and to any [*****] shall be



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         owned by [*****] and all right, title and interest in and to any
         [*****] shall be owned by [*****]

6.4      Newco shall not enter into any agreement with any third party for
         development of Newco Intellectual Property without the approval of the
         Management Committee.

6.5      Upon 30 days' prior notice in writing from Elan to Newco and Celtrix,
         Newco shall assign the Newco Intellectual Property including without
         limitation, all rights and obligations related thereto, from Newco to a
         wholly-owned subsidiary of Newco to be incorporated in Ireland, which
         company shall be newly incorporated by Elan and Celtrix to facilitate
         such assignment.

                                    CLAUSE 7

            OWNERSHIP OF INTELLECTUAL PROPERTY RIGHTS/NON-COMPETITION

The Parties acknowledge and agree to be bound by:

7.1      the provisions of Clause 2 of the Elan License Agreement (as
         supplemented by the provision of relevant definitions in the Elan
         License Agreement) and Clause 2 of the Celtrix License Agreement (as
         supplemented by the provision of relevant definitions in the Celtrix
         License Agreement) which set forth the agreement between the parties
         thereto in relation to the ownership of intellectual property rights;
         and

7.2      the provisions of Clause 5 of the Elan License Agreement and the
         provisions of Clause 5 of the Celtrix License Agreement which set forth
         the agreement between the parties thereto in relation to the
         non-competition obligations of Elan and Celtrix, respectively.

                                    CLAUSE 8

                                   TRADEMARKS

8.1      Elan shall grant to Newco [*****] in accordance with the terms and
         conditions of the Elan License Agreement. Elan shall at all times be
         and remain the owner of such trademark licensed to Newco.

8.2      Celtrix shall grant to Newco [*****]




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         in accordance with the terms and conditions of the Celtrix License
         Agreement. Celtrix shall at all times be and remain the owner of such
         trademark licensed to Newco.

                                    CLAUSE 9

                    DIRECTORS; MANAGEMENT AND R&D COMMITTEES

9.1.     DIRECTORS:

        The Board of Directors of Newco shall be composed of [*****] Directors.
        Celtrix shall have the right to nominate [*****] directors of Newco
        ("CELTRIX DIRECTORS") and EIS shall have the right to nominate [*****]
        Director of Newco ("EIS DIRECTOR"). Celtrix may appoint [*****] of the
        Celtrix Directors to be the chairman of Newco.

         9.1.1.   If the chairman is unable to attend any meeting of the Board,
                  [*****] shall be entitled to appoint another Director to act
                  as chairman in his place at the meeting.

         9.1.2.   If EIS removes the [*****], or Celtrix removes [*****] EIS or
                  Celtrix, as the case may be, shall indemnify the other
                  Stockholder against any claim by such removed Director arising
                  from such removal.

         9.1.3.   The Directors shall meet not less than [*****] in each
                  Financial Year and all Directors' meetings shall be held in
                  [*****] to the extent required pursuant to the laws of [*****]

         9.1.4.   At any such meeting, the presence [*****] shall be required to
                  constitute a quorum and, subject to Clause 19 hereof, the
                  affirmative vote of a majority of the Directors present at a
                  meeting at which such a quorum is present shall constitute an
                  action of the Directors. In the event of any meeting being
                  inquorate, the meeting shall be adjourned for a period of
                  seven days. A notice shall be sent to the EIS Director and the
                  Celtrix Directors specifying the date, time and place where
                  such adjourned meeting is to be held and reconvened.

         9.1.5.   The chairman of Newco, or his duly appointed successor, shall
                  hold office until the first meeting of the Directors after the
                  [*****] by [*****] of [*****]




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                  In the event that [*****] is exercised at any time by [*****],
                  each of [*****] and [*****] shall cause the board of directors
                  of Newco to be reconfigured so that an [*****] of Directors
                  are designated by [*****] and [*****.] Thereafter, (a) a
                  quorum shall require an [*****] and (b) each of [*****] and
                  [*****] beginning with EIS, shall have the right, exercisable
                  [*****] to be [*****] of Newco for a term of [*****] If the
                  chairman of Newco is unable to attend any meeting of the
                  Directors, the Directors shall be entitled to appoint another
                  Director to act as chairman of Newco in his place at the
                  meeting.

         9.1.6.   In case of an equality of votes at a meeting of the board of
                  directors of Newco, the chairman of Newco shall not be
                  entitled to a second or casting vote. In the event of
                  continued deadlock, the board of directors shall resolve the
                  deadlock pursuant to the provisions set forth in Clause 20,

9.2.     MANAGEMENT AND R&D COMMITTEES:

         9.2.1.   The Directors shall appoint a management committee (the
                  "MANAGEMENT COMMITTEE") to perform certain operational
                  functions, such delegation to be consistent with the
                  directors' right to delegate powers pursuant to the Newco
                  Memorandum of Association of Bye-Laws. The Management
                  Committee shall initially consist of [*****] members, [*****]
                  of whom will be nominated by EIS and [*****] of whom will be
                  nominated by Celtrix, and each of whom shall be entitled to
                  [*****] vote, whether or not present at any Management
                  Committee meeting during which such operational functions are
                  discussed. Decisions of the Management Committee shall require
                  approval by at least [*****] and [*****] Each of EIS and
                  Celtrix shall be entitled to remove any of their nominees to
                  the Management Committee and appoint a replacement in place of
                  any nominees so removed. The number of members of the
                  Management Committee may be altered if agreed to by a majority
                  of the directors of Newco; provided that, each of Elan and
                  Celtrix shall be entitled to appoint [*****] number of members
                  to the Management Committee.

         9.2.2.   The Management Committee shall appoint a research and
                  development committee (the "R&D COMMITTEE") which shall
                  initially be comprised of [*****] members, [*****] of whom
                  will be nominated by Elan and [*****] of whom will be
                  nominated by Celtrix, and each of whom shall have [*****]
                  vote, whether or not present at an R&D Committee meeting
                  during which research and development issues are discussed.
                  Decisions of the R&D



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                  Committee shall require approval by at least [*****] and
                  [*****] Each of Elan and Celtrix shall be entitled to remove
                  any of their nominees to the R&D Committee and appoint a
                  replacement in place of any nominees so removed. The number of
                  members of the R&D Committee may be altered if agreed to by a
                  majority of the Directors; provided that, each of Elan and
                  Celtrix shall be entitled to appoint an [*****] of members to
                  the R&D Committee. The R & D Committee shall meet at least
                  [*****] each calendar quarter alternately at the offices of
                  Elan and Celtrix (except where otherwise agreed) to monitor
                  the progress of that portion of the Business Plan that relates
                  to the Project and to report on their progress to the
                  Management Committee.

         9.2.3    The Management Committee shall be responsible for, inter alia,
                  devising, implementing and reviewing strategy for the business
                  of Newco, and the operation of Newco, and in particular,
                  devising Newco's strategy for research and development and to
                  monitor and supervise the implementation of Newco's strategy
                  for research and development. The Management Committee shall
                  report all significant developments to the Directors on the
                  occurrence thereof, and in addition, shall report at quarterly
                  intervals to the Directors in accordance with Clause 10.2 of
                  this Agreement.

         9.2.4.   The R&D Committee shall be responsible for:

                  9.2.4.1. designing that portion of the Business Plan that
                           relates to the Project for consideration by the
                           Management Committee;

                  9.2.4.2. establishing a joint Project team consisting of an
                           [*****] of team members from Elan and Celtrix,
                           including [*****] from each of Elan and Celtrix; and

                  9.2.4.3. implementing such portion of the Business Plan that
                           relates to the Project, as approved by the Management
                           Committee.

         9.2.4    In the event of any dispute amongst the R&D Committee, the R&D
                  Committee shall refer such dispute to the Management Committee
                  whose decision on the dispute shall be binding on the R&D
                  Committee.

                  If the Management Committee cannot resolve such matter or any
                  other matter under consideration by the Management Committee,
                  then the dispute will be referred to the [*****] and the
                  [*****]



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                  and thereafter, in the event of continued deadlock, pursuant
                  to the deadlock provisions to be set forth in Clause 20,
                  involving inter alia, the referral of the dispute to an
                  expert, whose decision, however, will ultimately be
                  non-binding on the Participants.

         9.2.6.   [*****] Elan and Celtrix shall permit Newco or its duly
                  authorized representative on reasonable notice and at any
                  reasonable time during normal business hours to have access to
                  inspect and audit the accounts and records of Elan or Celtrix
                  and any other book, record, voucher, receipt or invoice
                  relating to the calculation or the cost of the Project and to
                  the accuracy of the reports which accompanied them. Any such
                  inspection of Elan's or Celtrix's records, as the case may be,
                  shall be at the expense of Newco, except that if such
                  inspection reveals an overpayment in the amount paid to Elan
                  or Celtrix, as the case may be, for the Project hereunder in
                  any Financial Year of [*****] or more of the amount due to
                  Elan or Celtrix, as the case may be, then the expense of such
                  inspection shall be borne solely by Elan or Celtrix, as the
                  case may be, instead of by Newco. Any surplus over the sum
                  properly payable by Newco to Elan or Celtrix, as the case may
                  be, shall be paid promptly by Elan or Celtrix, as the case may
                  be, to Newco. If such inspection reveals a deficit in the
                  amount of the sum properly payable to Elan or Celtrix, as the
                  case may be, by Newco, Newco shall pay the deficit to Elan or
                  Celtrix, as the case may be.

                                    CLAUSE 10

                          THE BUSINESS PLAN AND REVIEWS

10.1     The Directors shall meet together as soon as reasonably practicable
         after the Closing Date hereof and shall agree upon and approve the
         Business Plan for the current Financial Year within 60 days of the date
         hereof. In subsequent Financial Years, the Directors shall meet
         together prior to the accounting reference date specified in Clause 16
         and agree upon and approve the Business Plan for the following
         Financial Year, or any amendment or modification to the Business Plan.

10.2     The Participants agree that the Management Committee shall submit to
         the Directors on [*****] or as soon as reasonably practicable
         thereafter in each Financial Year a report on the performance of the
         Business and research and development activities of Newco, and the
         Directors shall hold such meeting as may be necessary to review the
         performance of Newco against the Business Plan for the relevant year.




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                                    CLAUSE 11

                          RESEARCH AND DEVELOPMENT WORK

11.1     Research and development work related to the Products and the Newco
         Intellectual Property may include but shall not be limited to,
         screening, in-vitro pharmacology, toxicology, stability, prototype
         dosage form development, formulation, optimization, clinical and
         regulatory activities. Such work shall be agreed to and jointly
         conducted by Elan and Celtrix as provided in the Business Plan.

11.2     Elan (or an Affiliate of Elan nominated by Elan, including, without
         limitation, Elan Pharmaceutical International, Ltd., an Irish company)
         and Celtrix shall undertake for a period of thirty (30) months from the
         Effective Date, pursuant to the Business Plan and in accordance with
         the terms of the Funding Agreement, certain research and development
         work (a) with respect to the development and commercialization of the
         Products, and (b) in furtherance of the development of patent rights
         and know-how related to the Elan Intellectual Property, Celtrix
         Intellectual Property and Newco Intellectual Property. Newco shall pay
         Celtrix and Elan or Elan's Affiliate nominated by Elan hereunder for
         any research and development work carried out by them on behalf of
         Newco at the end of each month during the Project, subject to the
         proper vouching of research and development work and expenses. An
         invoice shall be issued to Newco by Celtrix or Elan or Elan's Affiliate
         nominated by Elan hereunder, as applicable, by the [*****] of the month
         following the month in which work was performed. The payments by Newco
         to Celtrix or Elan or Elan's Affiliate nominated by Elan hereunder
         shall be calculated by reference to [*****] in carrying out such
         research and development work, [*****] Research and development
         activities that are [*****] shall be charged to Newco at [*****]

                                   CLAUSE 12

                          INTELLECTUAL PROPERTY RIGHTS

12.1     Newco shall permanently mark or otherwise use reasonable efforts to
         cause any third party to permanently mark all Products and/or the
         packaging therefor with such license or patent notices to comply with
         the laws of the country of sale or otherwise to generally communicate
         the existence of any Elan Patents Rights or Celtrix Patent Rights for
         the countries of the Territory and in such manner as Elan



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         or Celtrix, as the case may be, may reasonably request in writing prior
         to the sale or commercial use thereof.

12.2     The Participants shall discuss in good faith all material issues
         relating to filing, prosecution and maintenance of Elan Patent Rights
         and Celtrix Patent Rights insofar as such patent rights are of
         relevance to the License Agreements and any patentable inventions and
         discoveries within the Elan Intellectual Property, Celtrix Intellectual
         Property and Newco Intellectual Property that relate to the License
         Agreements and any patentable improvements thereto. Subject to mutual
         agreement to the contrary by Celtrix and Elan the following provisions
         shall apply:

         12.2.1   Elan, [*****], shall make a good faith effort (a) to secure
                  the grant of any patent applications within the Elan Patent
                  Rights that relate to the Field; (b) to file and prosecute
                  patent applications covering the Elan Improvements that relate
                  to the Field; (c) to defend all such applications against
                  third party oppositions; and (d) to maintain in force any
                  issued patent or letters patent within the Elan Patent Rights
                  that relate to the Field (including any such patents that may
                  issue covering any such Elan Improvements that relate to the
                  Field). Elan shall have the sole right in its reasonable
                  business discretion to control such filing, prosecution,
                  defense and maintenance; provided, however, that Newco, at its
                  request, shall be provided with copies of all documents
                  relating to such filing, prosecution, defense, and maintenance
                  in sufficient time to review such documents and comment
                  thereon prior to filing.

         12.2.2   Celtrix, [*****], shall make a good faith effort (a) to secure
                  the grant of any patent applications within the Celtrix Patent
                  Rights that relate to the Field; (b) to file and prosecute
                  patent applications covering the Celtrix Improvements that
                  relate to the Field; (c) to defend all such applications
                  against third party oppositions; and (d) to maintain in force
                  any issued patent or letters patent within the Celtrix Patent
                  Rights that relate to the Field (including any such patents
                  that may issue covering any such Celtrix Improvements that
                  relate to the Field). Celtrix shall have the sole right in its
                  reasonable business discretion to control such filing,
                  prosecution, defense and maintenance; provided, however, that
                  Newco shall have the right to inspect copies of all documents
                  relating to such filing, prosecution, defense, and
                  maintenance, and to make copies thereof, upon reasonable prior
                  notice to Celtrix.




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         12.2.3   In the event that a Participant informs Newco that it does not
                  intend to file patent applications on patentable inventions
                  and discoveries within its respective Intellectual Property
                  that relate to the Field or patentable Improvements that
                  relate to the Field in one or more countries in the Territory
                  or fails to file such an application within a reasonable
                  period of time, Newco shall have the right, but not the
                  obligation, at Newco's [*****] to file and prosecute such
                  patent application(s) in the joint names of Newco and the
                  relevant Participant. Upon written request from Newco, the
                  relevant Participant shall execute all documents, forms and
                  declarations and do all things as shall be reasonably
                  necessary to enable Newco to exercise such option and right.

         12.2.4   Newco shall have responsibility and shall bear [*****]
                  necessary (a) to file and prosecute patent applications on
                  patentable inventions and discoveries within the Newco
                  Intellectual Property (b) to defend all such applications
                  against third party oppositions; and (c) to maintain in force
                  any issued patent, letters patent within the Newco
                  Intellectual Property (including any patents that issue on
                  patentable inventions and discoveries within the Newco
                  Intellectual Property).

12.3     The Participants and Newco shall promptly inform each other in writing
         of any infringement or alleged infringement of any patents within the
         Elan Patent Rights, Celtrix Patent Rights or Newco Intellectual
         Property or any misappropriation or alleged misappropriation of trade
         secrets within the Elan Intellectual Property, Celtrix Intellectual
         Property or the Newco Intellectual Property by a third party of which
         it becomes aware and provide the other with any available evidence of
         such infringement or misappropriation.

         12.3.1

                  12.3.1.1 Subject to Clauses 12.3.1.2 and 12.3.1.3 below and
                           during the term of the License Agreements, Newco
                           shall have the right to pursue legal action at
                           [*****] to protect against any such alleged
                           infringements of the Elan Patent Rights and Celtrix
                           Patent Rights or misappropriation of the Elan
                           Intellectual Property and Celtrix Intellectual
                           Property; provided, however, that such infringements
                           or misappropriation must relate solely to the Field.
                           In the event that Newco takes such action, Newco
                           shall do so at [*****] At Newco's request, the
                           relevant Participant will co-operate with such




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                           action insofar as the said action relates to the
                           Field at Newco's [*****] [*****]

                  12.3.1.2 In the event that (i) Newco decides, by unanimous
                           vote of the Management Committee, not to pursue such
                           infringers, within a reasonable period but in any
                           event within [*****] after receiving written notice
                           of such alleged infringement or misappropriation, or
                           (ii) if such alleged infringement or misappropriation
                           does not relate [*****] then either Elan, where the
                           infringement or misappropriation relates [*****] to
                           the [*****] or Celtrix, where the infringement or
                           misappropriate relates [*****] to the [*****] (in
                           either case, the [*****]), may in its discretion
                           initiate such proceedings in its own name, at [*****]
                           At the Affected Participant's request, Newco will
                           cooperate with such action at the [*****] At the
                           option and in the sole discretion of such Affected
                           Participant, the Affected Participant may request the
                           cooperation of the other Participant in such action;
                           in such case, the Participants may agree to institute
                           such proceedings in [*****] and shall reach agreement
                           [*****] to the third party.

                  12.2.1.3 In the event that the infringement of either the Elan
                           Patent Rights or Celtrix Patent Rights affects both
                           the Field as well as other products being developed
                           or commercialized by the Affected Participant or its
                           commercial partners outside the Field, then the
                           [*****] may in its discretion initiate such
                           proceedings in [*****] At the Affected Participant's
                           request, Newco will cooperate with such action at the
                           [*****] [*****]





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                           the [*****] may request the cooperation of the other
                           Participant in such action; in such case, the
                           Participants may agree to institute such proceedings
                           in [*****] and shall reach agreement [*****] to the
                           third party.

         12.3.2   During the term of the License Agreements, Newco shall have
                  the first right but not the obligation to bring suit or
                  otherwise take action against any alleged infringement of the
                  Newco Intellectual Property or alleged misappropriation of the
                  Newco Intellectual Property. If any such alleged infringement
                  or misappropriation occurs which gives rise to a cause of
                  action both [*****] Newco shall negotiate, together with Elan
                  and Celtrix, in good faith to determine the cause of action to
                  be taken. In the event that Newco takes such action, Newco
                  shall do so solely [*****] and all damages and monetary awards
                  recovered in or with respect to such action shall be the
                  property of Newco. At Newco's request, Elan and Celtrix will
                  cooperate with any such action at Newco's [*****]

         12.3.3   In the event that Newco does not bring suit or otherwise take
                  action against any alleged infringement of the Newco
                  Intellectual Property or alleged misappropriation of the Newco
                  Intellectual Property and so notifies the Participants in
                  writing within [*****] of receiving notice of such
                  infringement, (i) if only [*****] desires to and does pursue
                  such suit or take such action [*****], it shall be entitled
                  [*****] recovered in or with respect to such action, and (ii)
                  if both Participants want to pursue such suit or action
                  outside of Newco, they will negotiate in good faith an
                  appropriate allocation of costs, expenses and recovery
                  amounts.

12.4     In the event that a claim is or proceedings are brought against Newco
         by a third party alleging that the sale, distribution or use of a
         Product in the Territory solely because of Newco's use of either the
         Elan Intellectual Property or the Celtrix Intellectual Property, as the
         case may be, infringes the intellectual property rights of such party,
         Newco shall promptly advise either Elan or Celtrix, as the case may be,
         of such threat or suit.




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12.5     Newco shall indemnify, defend and hold Elan or Celtrix, as the case may
         be, harmless against all actions, losses, claims, demands, damages,
         costs and liabilities (including reasonable attorneys fees) relating
         directly or indirectly to all such claims or proceedings referred to in
         Clause 12.3 provided that Elan or Celtrix, as the case may be, shall
         not acknowledge to the third party or to any other person the validity
         of any claims of such a third party, and shall not compromise or settle
         any claim or proceedings relating thereto without the prior written
         consent of Newco, not to be unreasonably withheld or delayed. At its
         option, Elan or Celtrix, as the case may be, may elect to take over the
         conduct of such proceedings from Newco; provided that Newco's
         indemnification obligations shall continue; the costs of defending such
         claim shall be borne by Elan or Celtrix, as the case may be; and such
         Participant shall not compromise or settle any such claim or proceeding
         without the prior written consent of Newco, such consent not to be
         unreasonably withheld or delayed.

                                    CLAUSE 13

                                COMMERCIALIZATION

13.1     Newco will diligently pursue the research, development, prosecution and
         commercialization of the Products in accordance with the Business Plan.
         The Participants shall reasonably assist and cooperate with Newco in
         such research, development, prosecution and commercialization of the
         Products.

13.2     Notwithstanding anything contained in this Agreement to the contrary,
         [*****] shall have the right [*****] to enter into any agreement with
         Newco [*****] Such right of [*****] shall be exercised as follows:

         13.2.1   If Newco intends to commercialize or enter into an agreement
                  with a third party to commercialize the Products, then Newco
                  immediately shall notify [*****] in writing that [*****] may
                  elect to enter into negotiations referred to in this Clause
                  13.2. [*****] shall indicate its desire to enter into such
                  negotiations pursuant to this Clause 13.2 by delivering
                  written notice to Newco within [*****] of Elan's receipt of
                  the written notification from Newco to Elan (the "ELAN/NEWCO
                  OPTION"). If [*****] elects to enter into such negotiations,
                  the Parties shall negotiate in good faith the terms of an
                  applicable agreement.

         13.2.2   If, despite such good faith negotiations, [*****] and Newco do
                  not reach agreement on the terms of such an agreement within
                  [*****]




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SEPARATELY IN A REQUEST FOR CONFIDENTIAL TREATMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION


                  from [*****] exercise of the [*****] then Newco shall be free
                  to offer a third party[*****] terms to commercialize in the
                  Territory the Product that is subject to [*****]

                                    CLAUSE 14

                                  MANUFACTURING

14.1     If Newco elects to finance, develop and/or exploit the commercial
         production of a Product, it is the expectation of the Participants that
         Newco shall enter into a supply agreement with Elan or Celtrix, as the
         case may be, to allow for the commercial production of such Product on
         behalf of Newco, subject to the following: (a) Celtrix shall
         manufacture and supply, and/or subcontract the manufacture and supply,
         of SomatoKine(R) with respect to the Products, (b) Elan shall
         manufacture and supply, and/or subcontract the manufacture and supply,
         of the MEDIPAD(R) Drug Delivery System with respect to the Products,
         and (c) Elan shall have the [*****] The supply agreements shall be
         negotiated and agreed to by the Parties not later than the date of
         completion of Phase III (as such term is commonly used in connection
         with FDA applications) of the Project. The terms of the said supply
         agreements shall be on normal commercial terms, and shall be negotiated
         in good faith by the Parties thereto; provided that the Management
         Committee shall have the authority to approve the cost to Newco of such
         manufacture and supply of SomatoKine(R) and MEDIPAD(R) Drug Delivery
         System to Newco.

                                    CLAUSE 15

                        TECHNICAL SERVICES AND ASSISTANCE

15.1     Whenever commercially and technically feasible, Newco shall contract
         with Celtrix or Elan, as the case may be, to perform such other
         services as Newco may require, other than those specifically dealt with
         hereunder or in the License Agreements. In determining which Party
         should provide such services, the Management Committee shall take into
         account the respective infrastructure, capabilities and experience of
         Elan and Celtrix.

15.2     Newco shall, if appropriate, conclude an administrative support
         agreement with Elan and/or Celtrix on such terms as the Parties thereto
         shall in good faith negotiate. The administrative services shall
         include one or more of the following administrative services as
         requested by Newco:



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SEPARATELY IN A REQUEST FOR CONFIDENTIAL TREATMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION


         15.2.1   accounting, financial and other services;

         15.2.2   tax services;

         15.2.3   insurance services;

         15.2.4   human resources services;

         15.2.5   legal and company secretarial services;

         15.2.6   patent and related intellectual property services; and

         15.2.7   all such other services consistent with and of the same type
                  as those services to be provided pursuant to this Agreement,
                  as may be required.

         The foregoing list of services shall not be deemed exhaustive and may
         be changed from time to time upon written request by Newco.

15.3.    The Parties agree that each Party shall effect and maintain [*****]
         insurance in respect of all clinical trials and other activities
         performed by them on behalf of Newco. The Stockholders and Newco shall
         ensure that the industry standard insurance policies shall be in place
         for all activities to be carried out by Newco.

15.4     If Elan or Celtrix so requires, Celtrix or Elan, as the case may be,
         shall receive, at times and for periods mutually acceptable to the
         Parties, employees of the other Party (such employees to be acceptable
         to the receiving Party in the matter of qualification and competence)
         for instruction in respect of the Elan Intellectual Property or the
         Celtrix Intellectual Property, as the case may be, as necessary to
         further the Project.

15.5     The employees received by Elan or Celtrix, as the case may be, shall be
         subject to obligations of confidentiality no less stringent than those
         set out in Clause 23 and such employees shall observe the rules,
         regulations and systems adopted by the Party receiving the said
         employees for its own employees or visitors.


                                    CLAUSE 16


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EXCHANGE COMMISSION.


                      AUDITORS, BANKERS, REGISTERED OFFICE,
                  ACCOUNTING REFERENCE DATE; SECRETARY; COUNSEL

Unless otherwise agreed by the Stockholders and save as may be provided to the
contrary herein:

16.1     the auditors of Newco shall be [*****]

16.2     the bankers of Newco shall be [*****] or such other bank as may be
         mutually agreed from time to time;

16.3     the accounting reference date of Newco shall be December 31st in each
         Financial Year; and

16.4     the secretary of Newco shall be [*****] or such other Person as may be
         appointed by the Directors from time to time.

                                    CLAUSE 17

                                   REGULATORY

17.1     Newco shall keep the other Parties promptly and fully advised of
         Newco's regulatory activities, progress and procedures. Newco shall
         inform the other Parties of any dealings it shall have with an RHA, and
         shall furnish the other Parties with copies of all correspondence
         relating to the Products. The Parties shall collaborate to obtain any
         required regulatory approval of the RHA to market the Products.

17.2     Newco shall, at its own cost, file, prosecute and maintain any and all
         Regulatory Applications for the Products in the Territory in accordance
         with the Business Plan.

17.3     Any and all Regulatory Approvals obtained hereunder for any Product
         shall remain the property of Newco, provided that Newco shall allow
         Elan and Celtrix access thereto to enable Elan and Celtrix to fulfill
         their respective obligations and exercise their respective rights under
         this Agreement. Newco shall maintain such Regulatory Approvals at its
         own cost.

17.4     It is hereby acknowledged that there are inherent uncertainties
         involved in the registration of pharmaceutical products with the RHA's
         insofar as obtaining approval is concerned and such uncertainties form
         part of the business risk




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         involved in undertaking the form of commercial collaboration as set
         forth in this Agreement. Therefore, except for liabilities resulting
         from failure to use reasonable efforts, none of Elan, EIS or Celtrix
         shall have any liability to Newco solely as a result of any failure of
         a Product to achieve the approval of any RHA.

                                    CLAUSE 18

                              TRANSFERS OF SHARES;
                     RIGHT OF FIRST OFFER; TAG ALONG RIGHTS

18.1     GENERAL:

         No Stockholder shall, directly or indirectly, sell or otherwise
         transfer (each, a "TRANSFER") any Shares held by it except in
         accordance with this Agreement. Newco shall not, and shall not permit
         any transfer agent or registrar for any Shares to, transfer upon the
         books of Newco any Shares from any Stockholder to any transferee, in
         any manner, except in accordance with this Agreement, and any purported
         transfer not in compliance with this Agreement shall be void.

18.2     RIGHTS OF FIRST OFFER:

         If at any time after the end of the Term, a Stockholder shall desire to
         Transfer any Shares owned by it (a "SELLING STOCKHOLDER"), in any
         transaction or series of related transactions other than a Transfer to
         an Affiliate or subsidiary or to an off-balance sheet special purpose
         entity established by EIS or Celtrix, as the case may be, then such
         Selling Stockholder shall deliver prior written notice of its desire to
         Transfer (a "NOTICE OF INTENTION") (i) to Newco and (ii) to the
         Stockholders who are not the Selling Stockholder (and any transferee
         thereof permitted hereunder, if any), as applicable, setting forth such
         Selling Stockholder's desire to make such Transfer, the number of
         Shares proposed to be transferred (the "OFFERED SHARES") and the
         proposed form of transaction (the "TRANSACTION PROPOSAL"), together
         with any available documentation relating thereto and the price at
         which such Selling Stockholder proposes to Transfer the Offered Shares
         (the "OFFER PRICE"). The "Right of First Offer" provided for in this
         Clause 18 shall be subject to any "Tag Along Right" benefiting a
         Stockholder which may be provided for by Clause 18.3, subject to the
         exceptions set forth therein.

         Upon receipt of the Notice of Intention, the Stockholders who are not
         the Selling Stockholder shall have the right to purchase at the Offer
         Price the Offered Shares, exercisable by the delivery of notice to the
         Selling Stockholder (the "NOTICE OF EXERCISE"), with a copy to Newco,
         within 10 business days from the date of receipt of the Notice of
         Intention. If no such Notice of Exercise has been delivered by the
         Stockholders who are not the Selling Stockholder within such
         10-business day period, or such Notice of Exercise does not relate to
         all of the





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         Offered Shares covered by the Notice of Intention, then the Selling
         Stockholder shall be entitled to Transfer all of the Offered Shares to
         the intended transferee. In the event that all of the Offered Shares
         are not purchased by the non-selling Stockholders, the Selling
         Stockholder shall sell the available Offered Shares within 30 days
         after the delivery of such Notice of Intention on terms no more
         favorable to a third party than those presented to the non-selling
         Stockholders. If such sale does not occur, the Offered Shares shall
         again be subject to the Right of First Refusal set forth in Clause
         18.2.

         In the event that any of the Stockholders who are not the Selling
         Stockholder exercises their right to purchase all of the Offered Shares
         (in accordance with this Clause 18.2), then the Selling Stockholder
         shall sell all of the Offered Shares to such Stockholder(s), in the
         amounts set forth in the Notice of Intention, after not less than 10
         business days and not more than 25 business days from the date of the
         delivery of the Notice of Exercise. In the event that more than one of
         the Stockholders who are not the Selling Stockholders wish to purchase
         the Offered Shares, the Offered Shares shall be allocated to such
         Stockholders on the basis of their pro rata equity interests in Newco.

         The rights and obligations of each of the Stockholders pursuant to the
         Right of First Offer provided herein shall terminate upon the date that
         the Common Stock is registered under Section 12(b) or 12(g) of the
         Exchange Act.

         At the closing of the purchase of all of the Offered Shares by the
         Stockholders who are not the Selling Stockholder (scheduled in
         accordance with Clause 18.2), the Selling Stockholder shall deliver
         certificates evidencing the Offered Shares being sold, duly endorsed,
         or accompanied by written instruments of transfer in form reasonably
         satisfactory to the Stockholders who are not the Selling Stockholder,
         duly executed by the Selling Stockholder, free and clear of any adverse
         claims, against payment of the purchase price therefor in cash, and
         such other customary documents as shall be necessary in connection
         therewith.

18.3     TAG ALONG RIGHTS:

         Subject to Clause 18.2, a Stockholder (the "TRANSFERRING STOCKHOLDER")
         shall not Transfer (either directly or indirectly), in any one
         transaction or series of related transactions, to any Person or group
         of Persons, any Shares, unless the terms and conditions of such
         Transfer shall include an offer to the other Stockholders who have not
         exercised the Right of First Offer set forth above in Clause 18.2 (the
         "REMAINING STOCKHOLDERS"), to sell Shares at the same price and on the
         same terms and conditions as the Transferring Stockholder has agreed to
         sell its Shares (the "TAG ALONG RIGHT").





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         In the event a Transferring Stockholder proposes to Transfer any Shares
         in a transaction subject to this Clause 18.3, it shall notify, or cause
         to be notified, the Remaining Stockholders in writing of each such
         proposed Transfer. Such notice shall set forth: (i) the name of the
         transferee and the amount of Shares proposed to be transferred, (ii)
         the proposed amount and form of consideration and terms and conditions
         of payment offered by the transferee (the "TRANSFEREE TERMS") and (iii)
         that the transferee has been informed of the Tag Along Right provided
         for in this Clause 18.3, if such right is applicable, and the total
         number of Shares the transferee has agreed to purchase from the
         Stockholders in accordance with the terms hereof.

         The Tag Along Right may be exercised by each of the Remaining
         Stockholders by delivery of a written notice to the Transferring
         Stockholder (the "CO-SALE NOTICE") within 10 business days following
         receipt of the notice specified in the preceding subsection. The
         Co-sale Notice shall state the number of Shares owned by such Remaining
         Stockholder which the Remaining Stockholder wishes to include in such
         Transfer; provided, however, that without the written consent of the
         Transferring Stockholder, the amount of such securities belonging to
         the Remaining Stockholder included in such Transfer may not be greater
         than such Remaining Stockholder's percentage beneficial ownership of
         Fully Diluted Common Stock multiplied by the total number of shares of
         Fully Diluted Common Stock to be sold by both the Transferring
         Stockholder and all Remaining Stockholders. Upon receipt of a Co-sale
         Notice, the Transferring Stockholder shall be obligated to transfer at
         least the entire number of Shares set forth in the Co-sale Notice to
         the transferee on the Transferee Terms; provided, however, that the
         Transferring Stockholder shall not consummate the purchase and sale of
         any Shares hereunder if the transferee does not agree to purchase all
         such Shares specified in all Co-sale Notices. If no Co-sale Notice has
         been delivered to the Transferring Stockholder prior to the expiration
         of the 10 business day period referred to above and if the provisions
         of this Section have been complied with in all respects, the
         Transferring Stockholder shall have the right for a 45 day calendar day
         period to Transfer Shares to the transferee on the Transferee Terms
         without further notice to any other party, but after such 45-day
         period, no such Transfer may be made without again giving notice to the
         Remaining Stockholders of the proposed Transfer and complying with the
         requirements of this Clause 18.3.

         At the closing of any Transfer of Shares subject to this Clause 18.3,
         the Transferring Stockholder, and the Remaining Stockholder, in the
         event such Tag




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EXCHANGE COMMISSION.


         Along Right is exercised, shall deliver certificates evidencing such
         securities as have been transferred by each, duly endorsed, or
         accompanied by written instruments of transfer in form reasonably
         satisfactory to the transferee, free and clear of any adverse claim,
         against payment of the purchase price therefor.

         The rights and obligations of each of the Stockholders pursuant to the
         Tag Along Rights provided herein shall terminate upon the date that the
         Common Stock of Newco is registered under Section 12(b) or 12(g) of the
         Exchange Act.

         Notwithstanding the foregoing, this Clause 18 shall not apply to any
         sale of Common Stock pursuant to an effective registration statement
         under the Securities Act in a bona fide public offering.

                                    CLAUSE 19

                    MATTERS REQUIRING PARTICIPANTS' APPROVAL

19.1     Subject to the provisions of Clause 19.2, in consideration of Celtrix
         and Elan agreeing to enter into the License Agreements, the Parties
         hereby agree that Newco shall not without the prior approval of all of
         the EIS Directors and all of the Celtrix Directors:

         19.1.1.  engage in any activity other than the Business;

         19.1.2.  acquire or dispose of assets of a value in excess of [*****]
                  or sell the principal assets, undertaking or Business of
                  Newco;

         19.1.2.  create any fixed or floating charge, lien (other than a lien
                  arising by operation of law) or other encumbrance over the
                  whole or any part of the undertaking, property or assets of
                  Newco or of any Subsidiary;

         19.1.4.  borrow any sum in excess of a maximum aggregate sum
                  outstanding at any time of [*****];

         19.1.5.  make any loan or advance or give any credit (other than normal
                  trade credit) in excess of [*****] to any Person;

         19.1.6.  give any guarantee or indemnity to secure the liabilities or
                  obligations of any Party other than those which it is usual to
                  give in the ordinary course of a business similar to the
                  Business;




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SEPARATELY IN A REQUEST FOR CONFIDENTIAL TREATMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION.


         19.1.7.  enter into any contract, arrangement or commitment involving
                  expenditure on capital account or the realization of capital
                  assets if the amount or the aggregate amount of such
                  expenditure or realization by Newco would exceed [*****] in
                  any one year or in relation to any one project, and for the
                  purpose of this paragraph the aggregate amount payable under
                  any agreement for hire, hire purchase or purchase on credit
                  sale or conditional sale terms shall be deemed to be capital
                  expenditure incurred in the year in which such agreement is
                  entered into;

         19.1.8.  issue any unissued Shares or create or issue any new shares
                  (including a split of the Shares), except as expressly
                  permitted by the Newco Memorandum of Association and Bye-Laws;

         19.1.9.  alter any rights attaching to any class of share in the
                  capital of Newco or alter the Newco Memorandum of Association
                  and Bye-Laws;

         19.1.10. consolidate, sub-divide or convert any of Newco's share
                  capital or in any way alter the rights attaching thereto;

         19.1.11. dispose of Newco or of any shares in Newco;

         19.1.12. enter into any partnership or profit sharing agreement with
                  any Person other than arrangements with trade representatives
                  and similar Persons in the ordinary course of business;

         19.1.13. do or permit or suffer to be done any act or thing whereby
                  Newco may be wound up (whether voluntarily or compulsorily),
                  save as otherwise expressly provided for in this Agreement;

         19.1.14. issue any debentures or other securities convertible into
                  shares or debentures or any share warrants or any options in
                  respect of shares in Newco;

         19.1.15. enter into any contract or transaction except in the ordinary
                  and proper course of the Business on arm's length terms;

         19.1.16. acquire, purchase or subscribe for any shares, debentures,
                  mortgages or securities (or any interest therein) in any
                  company, trust or other Person;

         19.1.17. adopt any employee benefit program or incentive schemes;




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SEPARATELY IN A REQUEST FOR CONFIDENTIAL TREATMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION.


         19.1.18. engage any new employee at remuneration of greater than
                  [*****] per annum;

         19.1.19. pay any remuneration to the Directors by virtue of holding
                  such office other than Directors who hold executive office;

         19.1.20. licence or sub-licence any of the Elan Intellectual Property,
                  Celtrix Intellectual Property or Newco Intellectual Property;

         19.1.21. amend or vary the terms of the Celtrix License Agreement or
                  the Elan License Agreement;

         19.1.22. permit a person other than Newco to own a regulatory approval
                  relating to the Product(s);

         19.1.23. change the authorized signatories on Newco bank accounts;

         19.1.24. amend or vary the Business Plan;

         19.1.25. alter the number of Directors;

         19.1.26. pay dividends or distributions in respect of, or redeem or
                  repurchase, the equity of Newco;

         19.1.27. enter into joint venture agreements or any similar
                  arrangements with any Person; or

         19.1.28. create, acquire or dispose of any Subsidiary or of any shares
                  in any Subsidiary.

19.3     Notwithstanding any provision in this Agreement to the contrary, any
         decision regarding U.S. tax elections to be made by Newco, such as
         whether [*****], shall be made by unanimous vote of the Board of
         Directors.

                                    CLAUSE 20

                                    DISPUTES

20.1     Should any dispute or difference arise between Elan and Celtrix, or
         between Elan or Celtrix and Newco, during the period that this
         Agreement is in force, other than a dispute or difference relating to
         (i) the interpretation of any provision of this




                                       34
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         Agreement, (ii) the interpretation or application of law, or (iii) the
         ownership of any intellectual property, then any Party may forthwith
         give notice to the other Parties that it wishes such dispute or
         difference to be referred to the chief executive officer of Celtrix and
         the President of EPT.

20.2     In any event of a notice being served in accordance with Clause 20.1,
         each of the Participants shall within 14 days of the service of such
         notice prepare and circulate to the chief executive officer of Celtrix
         and the President of EPT a memorandum or other form of statement
         setting out its position on the matter in dispute and its reasons for
         adopting that position. Each memorandum or statement shall be
         considered by the chief executive officer of Celtrix and the President
         of EPT who shall endeavor to resolve the dispute. If the chief
         executive officer of Celtrix and the President of EPT agree upon a
         resolution or disposition of the matter, they shall each sign a
         statement which sets out the terms of their agreement. The Participants
         agree that they shall exercise the voting rights and other powers
         available to them in relation to Newco to assure that the agreed terms
         are fully and promptly carried into effect.

20.3     The chief executive officer of Celtrix and the President of EPT shall,
         if they are unable to resolve a dispute or difference when it is
         referred to them under Clause 20.2, refer the matter to an independent
         expert in pharmaceutical product development and marketing (including
         clinical development and regulatory affairs) (the "EXPERT"). The Expert
         shall be selected by the presiding justice of the Supreme Court of the
         State of New York sitting in the County, City and State of New York
         (the "PRESIDING JUSTICE") or, if the Expert should have a conflict of
         interest, by such other Person as such justice shall select, having
         assured himself as to such Person's independence. In each case, the
         Expert shall be selected having regard to his suitability to determine
         the particular dispute or difference on which the Expert is being
         requested to determine. Unless otherwise agreed between the chief
         executive officer of Celtrix and the President of EPT, the following
         rules shall apply to the appointment of the Expert. The fees of the
         Expert shall be shared equally between the Parties in dispute. The
         Expert shall be entitled to inspect and examine all documentation and
         any other material which the Expert may consider to be relevant to the
         dispute. The Expert shall afford each Party a reasonable opportunity
         (in writing or orally) of stating reasons in support of such
         contentions as each Party may wish to make relative to the matters
         under consideration. The Expert shall give notice in writing of his
         determination to the Parties within such time as may be stipulated in
         his terms of appointment or in the absence of such stipulation as soon
         as practicable but in any event within four weeks from the reference of
         the dispute or difference to him.




                                       35
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20.4     Any determination by the Expert of a dispute or difference shall not be
         final and binding on the Parties; provided, however, that any
         determination by the Expert of a dispute or difference referred by the
         Parties pursuant to Clause 21.6. shall be final and binding on the
         Parties.

                                    CLAUSE 21

                                   TERMINATION

21.1     This Agreement shall govern the operation and existence of Newco until
         (i) terminated by written agreement of all Parties hereto or (ii)
         otherwise terminated in accordance with this Clause 21.

21.2     For the purpose of this Clause 21, a "RELEVANT EVENT" is committed or
         suffered by a Participant if:

         21.2.1   it commits a material breach of its obligations under this
                  Agreement or the applicable License and fails to remedy it
                  within 60 days of being specifically required in writing to do
                  so by the other Participant; provided, however, that if the
                  breaching Participant has proposed a course of action to
                  rectify the breach and is acting in good faith to rectify same
                  but has not cured the breach by the 60th day, such period
                  shall be extended by such period as is reasonably necessary to
                  permit the breach to be rectified;

         21.2.2   a distress, execution, sequestration or other process is
                  levied or enforced upon or sued out against a material part of
                  its property which is not discharged or challenged within 30
                  days;

         21.2.3   it is unable to pay its debts in the normal course of
                  business;

         21.2.4   it ceases wholly or substantially to carry on its business,
                  otherwise than for the purpose of a reconstruction or
                  amalgamation, without the prior written consent of the other
                  Participant (such consent not to be unreasonably withheld);

         21.2.5   the appointment of a liquidator, receiver, administrator,
                  examiner, trustee or similar officer of such Participant or
                  over all or substantially all of its assets under the law of
                  any applicable jurisdiction, including without limitation, the
                  United States of America, Bermuda or Ireland;

         21.2.6   an application or petition for bankruptcy, corporate
                  re-organization, composition, administration, examination,
                  arrangement or any other procedure similar to any of the
                  foregoing under the law of any applicable jurisdiction,
                  including without limitation, the United States of America,
                  Bermuda or Ireland, is filed, and is not discharged within 60
                  days, or a Participant applies for or consents to the
                  appointment of a receiver, administrator, examiner or similar
                  officer of it or of all or a material part




                                       36
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                  of its assets, rights or revenues or the assets and/or the
                  business of a Participant are for any reason seized,
                  confiscated or condemned.

21.4     If either Participant commits or suffers a Relevant Event, the other
         Participant shall be entitled, within three months of the occurrence of
         the Relevant Event, to require the defaulting Participant (the
         "RECIPIENT PARTICIPANT") to sell on reasonable terms of payment to the
         non-defaulting Participant (the "PROPOSING PARTICIPANT") all (but not
         some only) of the Shares, held or beneficially owned by the Recipient
         Participant for an amount equal to the fair market value of the Shares
         of the Recipient Participant (the "BUYOUT OPTION").

21.5     The Proposing Participant shall notify the Recipient Participant of the
         exercise of the Buyout Option, no later than 30 business days prior to
         the proposed exercise thereof, by delivering written notice to the
         Recipient Participant stating that the Buyout Option is exercised and
         the price at which the Proposing Participant is willing to purchase the
         Shares of the Recipient Participant.

21.6     In the event that the Participants do not agree upon a purchase price
         for the Shares within five Business Days following the receipt by the
         Recipient Participant of written notice from the Proposing Participant
         pursuant to Clause 21.5 above, the Proposing Participant may contact
         the Presiding Justice and request that an independent US-based
         arbitrator who is knowledgeable of the pharmaceutical/biotechnology
         industry be appointed within 10 Business Days. The Presiding Justice
         shall endeavor to select an arbitrator who is technically knowledgeable
         in the pharmaceutical/biotechnology industry (and who directly and
         through his affiliates, has no business relationship with, or
         shareholding in, either the Proposing Participant or the Recipient
         Participant). Promptly upon being notified of the arbitrator's
         appointment, the Proposing Participant and the Recipient Participant
         shall submit to the arbitrator details of their assessment of the fair
         market value for the Shares of the Recipient Participant together with
         such information as they think necessary to validate their assessment.
         The arbitrator shall notify the Recipient Participant of the fair
         market value assessed by the Proposing Participant (the "PROPOSING
         PARTICIPANT PRICE") and shall notify the Proposing Participant of the
         fair market value assessed by the Recipient Participant (the "RECIPIENT
         PARTICIPANT PRICE"). The Proposing Participant and the Recipient
         Participant shall then be entitled to make further submissions to the
         arbitrator within five Business Days explaining why the Recipient
         Participant




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EXCHANGE COMMISSION.


         Price or the Proposing Participant Price, as the case may be, is
         unjustified. The arbitrator shall thereafter meet with the Proposing
         Participant and the Recipient Participant and shall thereafter choose
         either the Recipient Participant Price or the Proposing Participant
         Price (but not any other price) as the purchase price for the Shares
         (the "PURCHASE PRICE") on the basis of which price the Expert
         determines to be closer to the fair market value for the Shares of the
         Recipient Participant. The arbitrator shall use his best efforts to
         determine the Purchase Price within 30 Business Days of his
         appointment. The Proposing Participant and the Recipient Participant
         shall bear the costs of the arbitrator equally provided that the
         arbitrator may, in his discretion, allocate all or a portion of such
         costs to one Party. Any decision of the arbitrator shall be final and
         binding.

21.7     The Proposing Participant shall purchase the Shares of the Recipient
         Participant by delivery of the Purchase Price in cash no later than the
         15th Business Day following determination of the Purchase Price by the
         Expert.

21.8     The Shares of the Recipient Participant so transferred shall be sold by
         the transferor as beneficial owner with effect from the date of such
         transfer free from any lien, charge or encumbrance with all rights and
         restrictions attaching thereto.

21.9     If the Proposing Participant exercises the Buyout Option, both parties
         will negotiate in good faith to agree to additional reasonable
         provisions and/or amendments to the License Agreements to protect the
         intellectual property rights of the Recipient Party.

21.10    If either Participant commits a Relevant Event, the other Stockholder
         shall have in addition to all other legal and equitable rights and
         remedies hereunder, the right to terminate this Agreement upon 30 days'
         written notice.

21.11    In the event of a termination of the Elan License Agreement and/or the
         Celtrix License Agreement, both parties will negotiate in good faith to
         determine whether this Agreement should be terminated and if so, which
         provisions should survive termination.

21.12    The provisions of Clauses [*****] shall survive the termination of this
         Agreement under this Clause 21 in accordance with their terms; all
         other terms and provisions of this Agreement shall cease to have effect
         and be null and void upon the termination of this Agreement under this
         Clause 21.





                                       38
   42

                                    CLAUSE 22

                             [INTENTIONALLY OMITTED]


                                    CLAUSE 23

                                 CONFIDENTIALITY

23.1     The Parties and/or Newco acknowledge and agree that it may be
         necessary, from time to time, to disclose to each other confidential
         and/or proprietary information, including without limitation,
         inventions, works of authorship, trade secrets, specifications,
         designs, data, know-how and other information, relating to the Field,
         the Products, present or future products, the Newco Intellectual
         Property, the Elan Intellectual Property or the Celtrix Intellectual
         Property, as the case may be, methods, compounds, research projects,
         work in process, services, sales suppliers, customers, employees and/or
         business of the disclosing Party, whether in oral, written, graphic or
         electronic form (collectively "CONFIDENTIAL INFORMATION").

23.2     Any Confidential Information revealed by a Party to another Party shall
         be maintained as confidential and shall be used by the receiving Party
         exclusively for the purposes of fulfilling the receiving Party's rights
         and obligations under this Agreement, and for no other purpose.
         Confidential Information shall not include:

         23.2.1   information that is generally available to the public;

         23.2.2   information that is made public by the disclosing Party;

         23.2.3   information that is independently developed by the receiving
                  Party, as evidenced by such Party's records, without the aid,
                  application or use of the disclosing Party's Confidential
                  Information;

         23.2.4   information that is published or otherwise becomes part of the
                  public domain without any disclosure by the receiving Party,
                  or on the part of the receiving Party's directors, officers,
                  agents, representatives or employees;

         23.2.5   information that becomes available to the receiving Party on a
                  non-confidential basis, whether directly or indirectly, from a
                  source other than the disclosing Party, which source did not
                  acquire this information on a confidential basis; or




                                       39
   43

         23.2.6   information which the receiving Party is required to disclose
                  pursuant to:

                  (i)      a valid order of a court or other governmental body
                           or any political subdivision thereof or as otherwise
                           required by law, rule or regulation; or

                  (ii)     other requirement of law; provided, however, that if
                           the receiving Party becomes legally required to
                           disclose any Confidential Information, the receiving
                           Party shall give the disclosing Party prompt notice
                           of such fact so that the disclosing Party may obtain
                           a protective order or confidential treatment or other
                           appropriate remedy concerning any such disclosure.
                           The receiving Party shall fully co-operate with the
                           disclosing Party in connection with the disclosing
                           Party's efforts to obtain any such order or other
                           remedy. If any such order or other remedy does not
                           fully preclude disclosure, the receiving Party shall
                           make such disclosure only to the extent that such
                           disclosure is legally required; or

         23.2.7   information which was already in the possession of the
                  receiving Party at the time of receiving such information, as
                  evidenced by its records, provided such information was not
                  previously provided to the receiving party from a source which
                  was under an obligation to keep such information confidential;
                  or

         23.2.8   information that is the subject of a written permission to
                  disclose, without restriction or limitation, by the disclosing
                  Party.

23.3     Each Party agrees to disclose Confidential Information of another Party
         only to those employees, representatives and agents requiring knowledge
         thereof in connection with their duties directly related to the
         fulfilling of the Party's obligations under this Agreement, so long as
         such persons are under an obligation of confidentiality no less
         stringent than as set forth herein. Each Party further agrees to inform
         all such employees, representatives and agents of the terms and
         provisions of this Agreement and their duties hereunder and to obtain
         their written consent hereto as a condition of receiving Confidential
         Information. Each Party agrees that it will exercise the same degree of
         care and protection to preserve the proprietary and confidential nature
         of the Confidential Information disclosed by a Party, as the receiving
         Party would exercise to preserve its own Confidential Information. Each
         Party agrees that it will, upon request of another Party, return all
         documents and any copies thereof containing Confidential Information
         belonging to or disclosed by such other Party. Each Party shall
         promptly notify




                                       40
   44

[*****] INDICATES THAT CONFIDENTIAL MATERIAL HAS BEEN OMITTED AND FILED
SEPARATELY IN A REQUEST FOR CONFIDENTIAL TREATMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION.


         the other Parties upon discovery of any unauthorized use or disclosure
         of the other Parties' Confidential Information.

23.4     Notwithstanding the above, each Party may use or disclose Confidential
         Information disclosed to it by another Party to the extent such use or
         disclosure is reasonably necessary in filing or prosecuting patent
         applications, prosecuting or defending litigation, complying with
         patent applications, prosecuting or defending litigation, complying
         with applicable governmental regulations or otherwise submitting
         information to tax or other governmental authorities, conducting
         clinical trials, or granting a permitted sub-license or otherwise
         exercising its rights hereunder; provided, that if a Party is required
         to make any such disclosure of the other Party's Confidential
         Information, other than pursuant to a confidentiality agreement, such
         Party shall inform the third party recipient of the terms and
         provisions of this Agreement and their duties hereunder and shall
         obtain their consent hereto as a condition of releasing to the third
         party recipient the Confidential Information.

23.5     Any breach of this Clause 23 by any employee, representative or agent
         of a Party is considered a breach by the Party itself.

23.6     The provisions relating to confidentiality in this Clause 23 shall
         remain in effect during the Term and for a period of [*****] following
         the termination of this Agreement.

23.7     The Parties agree that the obligations of this Clause 23 are necessary
         and reasonable in order to protect the Parties' respective businesses,
         and each Party expressly agrees that monetary damages would be
         inadequate to compensate a Party for any breach by the other Party of
         its covenants and agreements set forth herein. Accordingly, the Parties
         agree and acknowledge that any such violation or threatened violation
         will cause irreparable injury to a Party and that, in addition to any
         other remedies that may be available, in law or in equity or otherwise,
         any Party shall be entitled to obtain injunctive relief against the
         threatened breach of the provisions of this Clause 23, or a
         continuation of any such breach by the other Party, specific
         performance and other equitable relief to redress such breach together
         with its damages and reasonable counsel fees and expenses to enforce
         its rights hereunder, without the necessity of proving actual or
         express damages.

23.8     If it is necessary for Celtrix to file a copy of this Agreement with
         the Securities and Exchange Commission pursuant to applicable law, then
         (a) Celtrix shall consult with Elan, and keep Elan fully informed, with
         respect thereto, and (b) Celtrix shall use its best efforts to obtain
         confidential treatment to the maximum extent possible with respect to
         such filing of this Agreement.



                                       41
   45

                                    CLAUSE 24

                                      COSTS

24.1     Each Stockholder shall bear its own legal and other costs incurred in
         relation to preparing and concluding this Agreement and the Transaction
         Documents.

24.2     All other costs, legal fees, registration fees and other expenses
         relating to the transactions contemplated hereby, including the costs
         and expenses incurred in relation to the incorporation of Newco, shall
         be borne by Newco.

                                    CLAUSE 25

                                     GENERAL

25.1     GOOD FAITH:

         Each of the Parties hereto undertakes with the others to do all things
         reasonably within its power that are necessary or desirable to give
         effect to the spirit and intent of this Agreement.

25.2     FURTHER ASSURANCE:

         At the request of any of the Parties, the other Party or Parties shall
         (and shall use reasonable efforts to procure that any other necessary
         parties shall) execute and perform all such documents, acts and things
         as may reasonably be required subsequent to the signing of this
         Agreement for assuring to or vesting in the requesting Party the full
         benefit of the terms hereof.

25.3     NO REPRESENTATION:

         Each of the Parties hereto hereby acknowledges that in entering into
         this Agreement it has not relied on any representation or warranty
         except as expressly set forth herein or in any document referred to
         herein.

25.4     FORCE MAJEURE:

         Neither Party to this Agreement shall be liable for delay in the
         performance of any of its obligations hereunder if such delay is caused
         by or results from causes beyond its reasonable control, including
         without limitation, acts of God, fires, strikes, acts of war (whether
         war be declared or not), insurrections, riots, civil commotions,
         strikes, lockouts or other labor disturbances or intervention of any
         relevant government authority, but any such delay or failure shall be
         remedied by such Party as soon as practicable.





                                       42
   46

25.5     RELATIONSHIP OF THE PARTIES:

         Nothing contained in this Agreement is intended or is to be construed
         to constitute Elan/EIS and Celtrix as partners, or Elan/EIS as an
         employee or agent of Celtrix, or Celtrix as an employee or agent of
         Elan/EIS.

         No Party hereto shall have any express or implied right or authority to
         assume or create any obligations on behalf of or in the name of another
         Party or to bind another Party to any contract, agreement or
         undertaking with any third Party.

25.6     COUNTERPARTS:

         This Agreement may be executed in any number of counterparts, each of
         which when so executed shall be deemed to be an original and all of
         which when taken together shall constitute this Agreement.

25.7     NOTICES:

         Any notice to be given under this Agreement shall be sent in writing by
         registered or recorded delivery post or reputable overnight courier
         such as Federal Express or telecopied to:

         Elan/EIS at:

         Lincoln House, Lincoln Place, Dublin 2, Ireland
         Attention:    Vice President & General Counsel
         Elan Pharmaceutical Technologies,
         a division of Elan Corporation, plc
         Telephone:    353-1-709-4000
         Fax:          353-1-709-4124

         and

         Elan International Services, Ltd.
         102 St. James Court
         Flatts, Smiths FL04
         Bermuda
         Attention:    President
         Telephone:    441-292-9169
         Fax:          441-292-2224




                                       43
   47

         with a copy to:

         Brock Silverstein LLC
         One Citicorp Center, 56th Floor
         New York, NY 10022  United States of America
         Attention:  David Robbins, Esq.
         Telephone     212-371-2000
         Fax:          212-371-5500

         Celtrix at:

         2033 Gateway Place, Suite 600
         San Jose, CA 95110 United States of America
         Attention:    President
         Telephone:    408-573-6263
         Fax:          408-573-6228

         with a copy to:

         Venture Law Group
         2800 Sand Hill Road
         Menlo Park, CA 94025 United States of America
         Attention:    Ned Ruffin
         Telephone:    650-854-4488
         Fax:          650-233-8386

         Newco at:

         102 St. James Court
         Flatts, Smiths FL04
         Bermuda
         Attention:    Secretary
         Telephone:    441-292-9169
         Fax:          441-292-2224

         or to such other address(es) as may from time to time be notified by
         any Party to the others hereunder.

         Any notice sent by mail shall be deemed to have been delivered within
         three Business Days after dispatch or delivery to the relevant courier
         and any notice sent by telecopy shall be deemed to have been delivered
         upon confirmation of receipt. Notices of change of address shall be
         effective upon receipt. Notices by telecopy shall also be sent by
         another method permitted hereunder.




                                       44
   48

25.8     GOVERNING LAW;

         This Agreement shall be governed by and construed in accordance with
         the laws of the State of New York without giving effect to any choice
         or conflict or law provision or rule. For the purpose of this Agreement
         the Parties submit to the personal jurisdiction of the United States
         District Court for the State of New York. The Parties each further
         irrevocably consent to the service of any complaint, summons, notice or
         other process by delivery thereof to it by any manner in which notices
         may be given pursuant to this Agreement.

         25.9.1   SEVERABILITY.

                  If any provision in this Agreement is agreed in writing by the
                  Parties to be, or is deemed to be, or becomes invalid,
                  illegal, void or unenforceable under any law that is
                  applicable hereto, (i) such provision will be deemed amended
                  to conform to applicable laws so as to be valid and
                  enforceable without materially altering the intention of the
                  Parties, and (ii) the validity, legality and enforceability of
                  the remaining provisions of this Agreement shall not be
                  impaired or affected in any way.

25.10    AMENDMENTS:

         No amendment, modification or addition hereto shall be effective or
         binding on any Party unless set forth in writing and executed by a duly
         authorized representative of all Parties.

25.11    WAIVER:

         No waiver of any right under this Agreement shall be deemed effective
         unless contained in a written document signed by the Party charged with
         such waiver, and no waiver of any breach or failure to perform shall be
         deemed to be a waiver of any future breach or failure to perform or of
         any other right arising under this Agreement.




                                       45
   49

25.12    ASSIGNMENT:

         None of the Parties shall be permitted to assign its rights or
         obligations hereunder without the prior written consent of the other
         Parties except as follows:

         25.12.1  Elan, EIS and/or Celtrix shall have the right to assign their
                  rights and obligations hereunder to their Affiliates provided,
                  however, that such assignment does not result in adverse tax
                  consequences for any other Parties.

         25.12.2  Elan, EIS and/or Celtrix shall have the right to assign their
                  rights and obligations hereunder to an off-balance sheet
                  special purpose entity established by Elan, EIS and/or
                  Celtrix.

25.13    WHOLE AGREEMENT/NO EFFECT ON OTHER AGREEMENTS:

         This Agreement (including the Schedules attached hereto) and the
         Transaction Documents set forth all of the agreements and
         understandings between the Parties with respect to the subject matter
         hereof, and supersedes and terminates all prior agreements and
         understandings between the Parties with respect to the subject matter
         hereof. There are no agreements or understandings with respect to the
         subject matter hereof, either oral or written, between the Parties
         other than as set forth in this Agreement and the Transaction
         Documents.

         In the event of any ambiguity or conflict arising between the terms of
         this Agreement and those of the Newco Memorandum of Association and
         Bye-Laws, the terms of this Agreement shall prevail.

         No provision of this Agreement shall be construed so as to negate,
         modify or affect in any way the provisions of any other agreement
         between any of the Parties unless specifically referred to, and solely
         to the extent provided herein. In the event of a conflict between the
         provisions of this Agreement and the provisions of the License
         Agreements, the terms of this Agreement shall prevail unless this
         Agreement specifically provide otherwise.

25.14    SUCCESSORS:

         This Agreement shall be binding upon and inure to the benefit of the
         Parties hereto, their successors and permitted assigns.




                                       46
   50

                IN WITNESS WHEREOF, the Parties hereto have executed this
Agreement on the day first set forth above.


                                              
                                                 SIGNED

                                                 BY: /s/ Kevin Insley
                                                    ----------------------------------

                                                    for and on behalf of
                                                    ELAN CORPORATION, PLC

in the presence of: /s/ [Illegible]
                   ------------------
                                                 SIGNED

                                                 BY: /s/ Kevin Insley
                                                    ---------------------------------

                                                    for and on behalf of
                                                    ELAN INTERNATIONAL SERVICES, LTD.

in the presence of: /s/ [Illegible]
                   ------------------

                                                 SIGNED

                                                 BY: /s/ Andreas Sommer
                                                    ----------------------------------

                                                    for and on behalf of
                                                    CELTRIX PHARMACEUTICALS INC.

in the presence of: /s/ Kia P. Royal-Barrett
                   -------------------------
                                                 SIGNED


                                                 BY: /s/ Andreas Sommer
                                                    ----------------------------------

                                                    for and on behalf of
                                                    CELTRIX NEWCO LTD.

in the presence of:/s/ Kia P. Royal-Barrett
                   -------------------------


                                       47
   51

                                   SCHEDULE 1


                             ELAN LICENSE AGREEMENT



   52




                                   SCHEDULE 2


                            CELTRIX LICENSE AGREEMENT