EXHIBIT (d)(6)

                       Xenograft Distribution Agreement

This Agreement is made by Tutogen Medical GmbH, a German corporation with
offices at IndustriestraBe 6, D-91077 Neunkirchen am Brand, Germany ("Tutogen")
and Sulzer Calcitek Inc., a Delaware corporation with offices at 1900 Aston
Avenue, Carlsbad, California, U.S.A. ("Sulzer").

                              W I T N E S S E T H:

WHEREAS, Tutogen collects xenograft bone tissue, processes such tissue, and
distributes xenograft bone tissue products through various distributors
throughout the world;

WHEREAS, Sulzer manufactures and sells worldwide a line of products used in
dental applications and desires to acquire from Tutogen the right to distribute
its xenograft bone tissue products worldwide for use in dental applications;

WHEREAS, Tutogen is willing to terminate the right of its existing distributors
to sell xenograft bone tissue products for dental applications and to appoint
Sulzer as its sole and exclusive distributor for such products in such
applications on the terms and conditions set forth herein;

NOW, THEREFORE, in consideration of the foregoing premises and the terms and
conditions set forth below, the parties hereby agree as follows:

Definitions

  1.1  "Affiliate" shall mean an entity that controls, is controlled by, or is
        ---------
       under common control with a party. For purposes of this definition,
       "control" shall mean the possession, directly or indirectly, of a
       majority of the voting power of such entity (whether through ownership of
       securities or partnership or other ownership interests, by contract or
       otherwise); provided that, such entity shall be deemed an Affiliate only
       so long as such control continues.

  1.2  "Clinical Costs" shall have the meaning set forth in Section 5.3.
        --------------

  1.3  "Contract Year" shall mean the one-year period following the Effective
        -------------
       Date of this Agreement and each one-year period following each
       anniversary of the Effective Date of this Agreement.

  1.4  "Effective Date" shall mean the date on which this Agreement has been
        --------------
       executed by an authorized officer of each party, as witnessed on the
       signature page of this Agreement.

  1.5  "FDA" shall mean the United States Food and Drug Administration.
        ---

  1.6  "Field of Use" shall mean all uses of processed xenograft bone tissue in
        ------------
       or adjoining the human maxilla or the human mandible.

  1.7  "Minimum Sales Goals" shall have the meaning set forth in Section 3.4.
        -------------------

  1.8  "Minimums Negotiation Period" shall have the meaning set forth in Section
        ---------------------------
       3.4.1.

  1.9  "Permitted Successor" shall mean any individual, corporation,
        -------------------
       partnership, joint venture, association, trust, or any other entity or
       organization of any kind or

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       character that assumes the obligations of a party under this Agreement as
       permitted according to the terms of this Agreement.

 1.10  "Products" shall mean the xenograft bone tissue products manufactured by
        --------
       Tutogen or an Affiliate of Tutogen or a Permitted Successor of Tutogen
       and listed on Schedule A attached hereto. The parties shall mutually
       agree on the addition of Products to Schedule A.

 1.11  "Regulatory Plan" shall have the meaning set forth in Section 5.2.2.
        ---------------

 1.12  "Sub-Territory" shall mean one of the following geographic regions or
        -------------
       countries comprising in part the Territory: Western Europe (European
       Union including Switzerland, Norway, Iceland, Turkey, and Israel);
       Eastern Europe; South America (including Central America and Mexico);
       United States of America; Canada; Far East (excluding Japan); Japan; and
       Middle East (including Africa).

 1.13  "Territory" shall mean the entire world.
        ---------

 1.14  "Third Party" shall mean a person or entity other than Tutogen, any
        -----------
       Tutogen Affiliate, Sulzer, any Sulzer Affiliate or any officer, director,
       or employee of Tutogen, any Tutogen Affiliate, Sulzer, or any Sulzer
       Affiliate.


2.  Grant of Rights

 2.1   Exclusive Distribution. Tutogen hereby appoints Sulzer, and Sulzer hereby
       ----------------------
       accepts the appointment during the term of this Agreement as the
       exclusive distributor of the Products in the Territory for the Field of
       Use.

 2.2   Consideration. In consideration of the transfer of distribution rights in
       -------------
       the Products for the Field of Use from Tutogen's existing international
       distributors to Sulzer, Sulzer agrees to pay Tutogen a total of
       US$800,000 by wire transfer pursuant to Tutogen's written instruction, as
       follows:

          2.2.1  US$400,000 shall be paid within five business days following
                 execution of this Agreement;

          2.2.2  US$200,000 shall be paid within five business days following
                 Sulzer's first delivery of a Product in Western Europe; and

          2.2.3  US$200,000 shall be paid within five business days following
                 Tutogen's delivery to Sulzer of a copy of a written notice from
                 the FDA confirming a 510(k) approval for commercial sales of a
                 Product in the United States.

3.  Sulzer's Obligations

 3.1   Marketing Efforts.  Sulzer agrees to use commercially reasonable efforts
       -----------------
       to market and sell the Products throughout the Territory for the Field of
       Use. Sulzer shall have no right or obligation to market the Products for
       any use other than the Field of Use.

 3.2   Forecasting.  Within 60 days following the execution of this Agreement,
       -----------
       Sulzer shall provide Tutogen with a monthly forecast of demand for the
       Products during the succeeding six-month period. Commencing with the
       second calendar quarter

CONFIDENTIAL                  Xenograft Distribution Agreement - Page 2


       of 2001 and continuing quarterly thereafter, Sulzer shall provide
       Tutogen, no later than 15 days prior to each calendar quarter, with a
       rolling monthly forecast of sales of the Products for the succeeding 12
       months. Sulzer's forecasts shall specify the anticipated sales by
       Product, by Sub-Territory, and by month. Sulzer shall incur no liability
       to Tutogen in the event that actual sales of the Products differ from
       Sulzer's forecasts.

 3.3   Sales Personnel. Sulzer shall use reasonable efforts to train its sales
       ---------------
       personnel in techniques for proper use of the Products.

 3.4   Minimum Sales Goals.  Between the 21st month following the Effective Date
       -------------------
       and the end of the second Contract Year, Sulzer and Tutogen shall agree
       to minimum annual goals for sales (measured by units of Product) for the
       Products by Sub-Territory (the "Minimum Sales Goals") for the third,
       fourth, and fifth Contract Years. The Minimum Sales Goals shall be
       recorded on Schedule B. The parties acknowledge that sales of the
       Products in any particular Sub-Territory is a function of many factors,
       some of which are beyond the control of Sulzer. Accordingly, the parties'
       intent in establishing Minimum Sales Goals is to insure that Sulzer uses
       reasonable efforts to promote the sale of the Products in a particular
       Sub-Territory and not to guarantee Tutogen a minimum income.

          3.4.1  In the three-month period preceding the end of the fifth
                 Contract Year, and every three years thereafter during the term
                 of this Agreement (such three-month period being the "Minimums
                 Negotiation Period"), the parties shall agree on Minimum Sales
                 Goals of the Products by Territory for three consecutive years.

          3.4.2  For each Territory in which a Product is first approved for
                 commercial sale subsequent to the Effective Date, the parties
                 shall establish initial Minimum Sales Goals within two years
                 after the date of Product approval, from that date through the
                 next Minimums Negotiation Period, with subsequent Minimum Sales
                 Goals for the Product thereafter established during the
                 Minimums Negotiation Period as provided by the procedure first
                 set forth herein.

          3.4.3  If the parties have not reached agreement on the Minimum Sales
                 Goals in a particular Sub-Territory for a particular year
                 within a time frame specified herein, the parties shall resolve
                 the matter by binding arbitration as provided in Section 9.9 of
                 this Agreement.

          3.4.4  In the event that Sulzer fails to meet the Minimum Sales Goal
                 for a Product in any Sub-Territory in any year, then Tutogen
                 shall have the option (i) to engage in co-promotion of the
                 Product, at Tutogen's sole expense, in the Territory in which
                 the Minimum Sales Goal was not met, or (ii) to co-distribute
                 the Product (either directly or through a Third Party) in the
                 Sub-Territory in which the Minimum Sales Goal was not met.

          3.4.5  In the event that Sulzer fails to meet the Minimum Sales Goal
                 for a Product in a Sub-Territory for two consecutive years,
                 then Tutogen shall have the option to terminate Sulzer's right
                 and license to distribute the Product in that particular Sub-
                 Territory on 30 days written notice to Sulzer.

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          3.4.6  Following termination of Sulzer's right to distribute a Product
                 in a particular Sub-Territory, Tutogen shall have the right to
                 license a Third Party to distribute a product for the same
                 indication in such Sub-Territory. Tutogen shall exercise its
                 option to co-promote, co-distribute, or terminate, if at all,
                 by written notice to Sulzer within 90 days following the date
                 on which such option matures. The remedies set forth herein for
                 Sulzer's failure to meet the Minimum Sales Goal are exclusive,
                 and Sulzer shall have no duty to pay Tutogen any amount for
                 failure to achieve the Minimum Sales Goal.

4. Tutogen's Obligations

     4.1  Product Supply.  Tutogen agrees to use its best efforts to acquire
          --------------
          xenograft bone tissue, process the tissue using the Tutoplast process
          according to Sulzer's forecasts for demand for Products, manufacture
          the Products, package and label the Products as required for
          distribution in the different countries within the Territory, and sell
          the Products to Sulzer pursuant to purchase orders issued by Sulzer at
          the transfer prices listed in Schedule C attached hereto. Sulzer shall
          pay the transfer price to Tutogen within 45 days from the date of
          Tutogen's invoice. In no event shall Tutogen or an Affiliate of
          Tutogen or a Permitted Successor of Tutogen during the term of this
          Agreement supply xenograft bone tissue to a Third Party for
          distribution in the Territory for the Field of Use.

     4.2  Termination of Distribution Contracts.  Tutogen shall terminate the
          -------------------------------------
          right of its existing distributors to distribute the Products for the
          Field of Use as soon as possible after the Effective Date according to
          the terms of existing distribution agreements, if any. Tutogen agrees
          to insure that any substantial inventory of the Products held by the
          distributors at the time of their termination is either returned to
          Tutogen or transferred to Sulzer.

     4.3  Training.  Tutogen agrees to provide training services to Sulzer, as
          --------
          reasonably requested by Sulzer, regarding the Tutoplast process and
          the manufacture and use of the Products. Tutogen and Sulzer shall
          confer and agree upon on the scope of and location for the training
          services to be provided by Tutogen and the distribution of the
          expenses for such training services.

5.  Regulatory Matters

     5.1  Import Compliance. Tutogen agrees to comply with and maintain
          -----------------
          compliance with all governmental rules, regulations, statutes, and
          other laws of any kind relating to acquisition of xenograft tissue,
          manufacture the Products, packaging and labeling of the Products, and
          delivery of the Products to Sulzer for distribution within the
          Territory.

     5.2  Regulatory Responsibilities. The parties understand that as of the
          ---------------------------
          Effective Date of this Agreement, the Products are regulated by
          governmental authorities in most of the countries in the Territory,
          and Tutogen has obtained approvals from such regulatory authorities to
          sell many of the Products in such countries. As to Products for which
          Tutogen has not obtained regulatory approval in a particular country
          as of the Effective Date, or Products that first become regulated in a


CONFIDENTIAL                          Xenograft Distribution Agreement - Page 4


          particular country after the Effective Date, subject to the agreement
          of both Sulzer and Tutogen to seek regulatory approval therefor,
          Tutogen shall be responsible for applying for regulatory approval for
          such Products.

               5.2.1  In the event that either Sulzer or Tutogen, in its sole
                      discretion, does not agree to seek regulatory approval for
                      a regulated Product in a particular country, then such
                      Product shall be removed from Schedule A as to that
                      particular country. If Tutogen desires to seek regulatory
                      approval, but Sulzer does not, then Tutogen shall have the
                      right to seek regulatory approval for such product at its
                      own expense and to distribute such product without
                      obligation to Sulzer under this Agreement. If Sulzer
                      desires to seek regulatory approval for such product, but
                      Tutogen does not, Sulzer, subject to Tutogen's agreement
                      to supply the product, shall have the right to seek
                      regulatory approval for such product at its own expense
                      and to distribute the product without obligation to
                      Tutogen under this Agreement.

               5.2.2  In the event that Sulzer and Tutogen each agree to seek
                      regulatory approval for a Product, then the parties shall
                      forthwith meet and agree upon a plan pursuant to which
                      Tutogen will seek regulatory approval for the Product from
                      the regulatory body in question (the "Regulatory Plan").
                      The Regulatory Plan shall include an agreement as to the
                      scope, timing, and supervisory responsibility for
                      preclinical studies, clinical trials, regulatory
                      submissions, and all other matters related to the
                      regulatory approval process for the Product. The parties
                      shall meet at least once annually to review and amend the
                      Regulatory Plan as dictated by the current status of the
                      clinical and regulatory process.

               5.2.3  Sulzer and Tutogen hereby specifically agree to seek a
                      510(k) approval from the FDA for use of bovine cancellous
                      chips for periodontal defects in the United States. The
                      parties shall meet within 90 days following the Effective
                      Date and agree upon a Regulatory Plan therefor.

     5.3  Clinical Expenses. Sulzer and Tutogen shall each pay one-half of all
          -----------------
          out-of-pocket expenses incurred in execution of a Regulatory Plan
          subsequent to the Effective Date, excluding salary, benefits, and
          other costs for employees of the parties (the "Clinical Expenses").

               5.3.1  In the absence of an agreement otherwise, a party that
                      incurs Clinical Expenses in a calendar quarter shall
                      invoice the other party quarterly in arrears for one-half
                      of such Clinical Expenses. The invoice shall specify for
                      each such expense the vendor, the purpose, and the date
                      such expense was incurred and shall include a copy of
                      supporting documentation of the expense.

               5.3.2  A party receiving an invoice for Clinical Expenses, unless
                      the invoice is disputed, shall either pay the invoice or
                      setoff the invoice with other Clinical Expenses within 45
                      days from the date of the invoice.

     5.4  Ownership of Approvals.  Tutogen shall be the record owner of all
          ----------------------
          regulatory approvals to sell Products in the Territory for the Field
          of Use.

     5.5  Product Recalls.  Tutogen, as manufacturer of the Products, shall be
          ---------------
          responsible for execution of and all expenses related to any recall of
          Products, including, but

CONFIDENTIAL                          Xenograft Distribution Agreement - Page 5


          not limited to, retrieving recalled Products from users, scrapping or
          discarding recalled Products, and resupplying users with replacement
          Products.

6.  Trademark License and Product Labeling

     6.1  License Grant.  Tutogen grants Sulzer a nonexclusive license under
          -------------
          Tutogen's trademarks, Tutoplast and Tutodent, to use the trademarks
          solely in connection with the Products and the marketing thereof
          within the Territory for the Field of Use.

     6.2  Approval of Marketing Publications.  Sulzer shall provide Tutogen with
          ----------------------------------
          samples of all of Sulzer's marketing and other printed materials
          utilizing a trademark of Tutogen in advance of publication of the
          same. Tutogen shall be deemed to have approved such samples for actual
          use unless it objects in writing within 10 business days following
          Sulzer's delivery of same.

     6.3  Labeling. Tutogen agrees to include the trademarks of Sulzer on
          --------
          Product labels in a manner mutually agreeable to the parties.

     6.4  New Trademarks. Subject to the approval of Tutogen, which shall not be
          --------------
          withheld unreasonably, Sulzer shall have the right to adopt new
          trademarks of its choosing for use in connection with the Products.

7.  Term and Termination

     7.1  Term. This Agreement shall be effective on the Effective Date and
          ----
          shall remain in effect for an initial term of 10 Contract Years,
          unless sooner terminated according to the terms set forth in this
          Agreement. At the end of the tenth Contract Year and each succeeding
          anniversary of the Effective Date, this Agreement shall renew
          automatically for a successive one-year term unless one party gives
          the other party written notice of termination at least 12 months in
          advance of the renewal date.

     7.2  Material Breach. If either party is in material breach of any
          ---------------
          obligation in this Agreement, the non-breaching party may give written
          notice to the breaching party of its intention to terminate this
          Agreement, and this Agreement will terminate 60 days after the giving
          of such notice unless during the 60-day period (i) the breach has been
          cured, or (ii) if a breach is incapable of cure within the 60-day
          period, the breaching party has commenced action which is calculated
          to result in a cure of the breach to the reasonable satisfaction of
          the non-breaching party within 120 days after the giving of notice. If
          at the end of the 60-day or 120-day period following a notice of
          termination the parties disagree as to whether the Agreement has
          terminated as provided in this paragraph, the parties shall continue
          to perform under this Agreement until an arbitration tribunal
          constituted as provided in this Agreement has ruled on the matter.

     7.3  Insolvency.  Either party may terminate this Agreement immediately on
          ----------
          delivery of written notice to the other party (i) upon the institution
          by or against such other party of insolvency, receivership, or
          bankruptcy proceedings or any other proceedings for the settlement of
          such party's debts; provided that, with respect to involuntary
          proceedings, such proceedings are not dismissed within 120 days,


CONFIDENTIAL                          Xenograft Distribution Agreement - Page 6


          (ii) upon such other party's making an assignment for the benefit of
          creditors, or (iii) upon such other party's dissolution or ceasing to
          do business.

     7.4  Refund of Clinical Expenses. In the event that the Agreement
          ---------------------------
          terminates (i) by reason of Tutogen's notice of termination under
          Section 7.1, or (ii) by reason of Tutogen's material breach under
          Section 7.2, then Tutogen shall be obligated to refund Sulzer's
          payment of Clinical Expenses, as determined in this Section 7.4, in
          obtaining or attempting to obtain regulatory approval for Products
          under Section 5.2. For each Product as to which Sulzer has reimbursed
          a portion of Clinical Expenses paid by Tutogen, Tutogen shall be
          obligated to refund an amount determined by multiplying the Clinical
          Expenses for that Product by the Refund Ratio. The "Refund Ratio" is

                       10 yrs - (t\\exp\\ - \\tapp\\) / 10 yrs,

          where t\\exp\\ is the effective date of termination of the Agreement
          and t\\app\\ is the date of regulatory approval for the Product. For
          example, if Tutogen obtains a regulatory approval for a Product at the
          beginning of the second Contract Year after incurring $100,000 of
          Clinical Expenses reimbursed by Sulzer and the Agreement terminates at
          the beginning of the fifth Contract Year, the Refund Ratio is

                       10 yrs - (3 yrs) / 10 yrs  =  0.7

          and Tutogen owes Sulzer $70,000. The refund amount shall be paid in
          three equal annual installments due on the date of termination, one
          year after termination, and two years after termination, without
          interest.


8.  Representations, Warranties, Indemnities, and Limitations of Liability

     8.1  Tutogen.  Tutogen represents and warrants to Sulzer, as follows:
          -------

             8.1.1  Tutogen has the corporate power and authority to execute and
                    deliver this Agreement and to perform its obligations
                    hereunder, and the execution, delivery, and performance of
                    this Agreement have been validly authorized by Tutogen.

             8.1.2  Tutogen has the right to grant to Sulzer the rights and
                    licenses granted in this Agreement.

             8.1.3  As of the date of this Agreement, and to the best of its
                    knowledge and belief, neither the manufacture, nor the use,
                    nor the sale of the Products in the Territory constitutes a
                    misuse or misappropriation of confidential information or
                    trade secrets or a breach of confidence, and does not
                    infringe or violate any valid patent, trademark, or
                    copyright or any other intellectual property rights of any
                    third party. Tutogen has disclosed to Sulzer all patents and
                    other intellectual property rights which, to Tutogen's
                    knowledge, may have a material effect on Sulzer's ability to
                    market the Products.

             8.1.4  Tutogen has not received notice that the manufacture, use,
                    or sale of the Products violates any patent rights or any
                    other intellectual property right or constitutes a
                    misappropriation or misuse of trade secrets or proprietary
                    information.


CONFIDENTIAL                          Xenograft Distribution Agreement - Page 7


             8.1.5  Tutogen shall promptly notify Sulzer of any claim of
                    infringement or misappropriation relating to the Products.

             8.1.6  To the best of Tutogen's knowledge and belief, Tutogen
                    possesses all governmental and other approvals required for
                    the collection and processing of xenograft tissue, and
                    Tutogen shall use commercially reasonable efforts to
                    maintain all such approvals throughout the term of this
                    Agreement.

             8.1.7  For a period of 12 months from the date of Tutogen's
                    delivery to Sulzer, each Product shall be free from defects
                    in material, manufacturing, and workmanship, including, but
                    not limited to, disease, excluding defects caused by the
                    abuse, misuse, neglect, or by improper testing, handling,
                    storage, or use by a party other than Tutogen.

     8.2  Liability for Breach of Product Warranty. If any failure to conform to
          ----------------------------------------
          the representation and warranty set forth in Section 8.1.7 appears
          within the applicable warranty period, Tutogen will, at its option and
          expense, correct any such failure by either replacing the defective or
          non-conforming Product or by repairing such Product. In no event shall
          the liability of Tutogen in connection with such warranty exceed the
          cost of replacing or repairing the defective Product. The foregoing
          shall constitute the exclusive remedy of Sulzer and the sole liability
          of Tutogen whether in contract or in tort or otherwise relating to a
          defect of a Product.

     8.3  Exclusion of Other Warranties. The representations and warranties
          -----------------------------
          stated in Section 8.1 are expressly in lieu of all other warranties,
          including, but not limited to, any implied warranty of merchantability
          or of fitness, and constitute the only warranties made with respect to
          any Product.

     8.4  Sulzer.   Sulzer represents and warrants to Tutogen, as follows:
          ------

             8.4.1  Sulzer has the corporate power and authority to execute and
                    deliver this Agreement and to perform its obligations
                    hereunder, and the execution, delivery, and performance of
                    this Agreement have been validly authorized by Sulzer.

     8.5  Indemnity by Tutogen.
          --------------------

             8.5.1  Tutogen shall defend, indemnify, and hold harmless Sulzer
                    against any liability or damages from any third party
                    claims, suits, proceedings, demands, recoveries, or expenses
                    ("Claims") to the extent that such Claims arise from or are
                    based upon: (i) material breach by Tutogen of any of its
                    representations or warranties contained herein; or (ii)
                    negligence, gross negligence, or intentionally wrongful acts
                    or omissions on the part of Tutogen; provided that Sulzer:
                    (a) promptly notifies Tutogen in writing of any such Claim
                    which comes to its attention; (b) allows Tutogen to control
                    the defense or settlement of such Claim; (c) does not enter
                    into any settlement or compromise of such Claim without the
                    express authorization of Tutogen; and (d) reasonably
                    cooperates with Tutogen in the defense of such Claim,
                    subject to Tutogen's payment of all reasonable out-of-pocket
                    expenses associated with such cooperation by Sulzer. Sulzer
                    shall have the

CONFIDENTIAL                         Xenograft Distribution Agreement - Page 8


                    right to participate in a non-controlling fashion in such
                    legal proceeding at its sole expense.

             8.5.2  No undertaking of Tutogen under this section shall extend to
                    any such alleged infringement or violation to the extent
                    that it: (a) arises from adherence to design modifications,
                    specifications, drawings, or written instructions which
                    Tutogen is directed by Sulzer to follow, but only if such
                    alleged infringement or violation does not reside in
                    corresponding Product of Tutogen's design or selection; or
                    (b) arises from adherence to instructions to apply Sulzer's
                    trademark, trade name, or other company identification; or
                    (c) resides in a Product which is not of Tutogen's origin
                    and which is furnished by Sulzer to Tutogen for use under
                    this Agreement; or (d) relates to use of Products or other
                    items provided by Tutogen in combination with other Products
                    or items furnished either by Tutogen or others, which
                    combination was not installed, recommended, or otherwise
                    approved by Tutogen. In the foregoing cases numbered (a)
                    through (d), Sulzer will defend and hold Tutogen harmless,
                    subject to the same terms and conditions and exceptions
                    stated above, with respect to Tutogen's rights and
                    obligations under this clause.

 8.6  Indemnity by Sulzer.
      -------------------

             8.6.1  Sulzer shall defend, indemnify, and hold harmless Tutogen
                    against any liability or damages from any third party
                    claims, suits, proceedings, demands, recoveries, or expenses
                    ("Claims") to the extent that such Claims arise from or are
                    based upon: (i) material breach by Sulzer of any of its
                    representations or warranties contained herein; or (ii)
                    negligence, gross negligence, or intentionally wrongful acts
                    or omissions on the part of Sulzer; provided that Tutogen:
                    (a) promptly notifies Sulzer in writing of any such Claim
                    which comes to its attention; (b) allows Sulzer to control
                    the defense or settlement of such Claim; (c) does not enter
                    into any settlement or compromise of such Claim without the
                    express authorization of Sulzer; and (d) reasonably
                    cooperates with Sulzer in the defense of such Claim, subject
                    to Sulzer's payment of all reasonable out-of-pocket expenses
                    associated with such cooperation by Tutogen. Tutogen shall
                    have the right to participate in a non-controlling fashion
                    in such legal proceeding at its sole expense.

             8.6.2  No undertaking of Sulzer under this section shall extend to
                    any such alleged infringement or violation to the extent
                    that it: (a) arises from adherence to design modifications,
                    specifications, drawings, or written instructions which
                    Sulzer is directed by Tutogen to follow, but only if such
                    alleged infringement or violation does not reside in
                    corresponding Product of Sulzer's design or selection; or
                    (b) arises from adherence to instructions to apply Tutogen's
                    trademark, trade name, or other company identification; or
                    (c) resides in a Product which is not of Sulzer's origin and
                    which is furnished by Tutogen to Sulzer for use under this
                    Agreement; or (d) relates to use of Products or other items
                    provided by Sulzer in combination with other Products or
                    other items, furnished either by Sulzer or others, which
                    combination was not installed, recommended or otherwise
                    approved by Sulzer. In the


CONFIDENTIAL                          Xenograft Distribution Agreement - Page 9


                    foregoing cases numbered (a) through (d), Tutogen will
                    defend and hold Sulzer harmless, subject to the same terms
                    and conditions and exceptions stated above with respect to
                    Sulzer's rights and obligations under this clause.

     8.7  Limitation of Liability to Third Parties. The liability of Tutogen and
          ----------------------------------------
          Sulzer with respect to any and all claims, actions, proceedings, or
          suits by any third party alleging infringement of patents, trademarks,
          or copyrights or violation of trade secrets or proprietary rights
          because of, or in connection with, any items furnished pursuant to
          this Agreement shall be limited to the specific undertakings contained
          in this Section 8.

     8.8  Exclusion of Consequential Damages. Neither Tutogen nor Sulzer shall
          ----------------------------------
          in any event or under any circumstances, including, but not limited to
          liability, delay, or warranty, be liable to the other for special or
          consequential damages, including but not limited to, loss of profit or
          revenue, loss of use of production line, or claims by customers for
          service interruptions. The remedies for the parties set forth in this
          Agreement are exclusive.


9.  Miscellaneous Provisions

     9.1  Entire Agreement.
          ----------------

          9.1.1  This Agreement, together with the U.S. Service Agreement and
                 the Processed Tissue Development and License Agreement, all
                 between the parties or their Affiliates of even date, embodies
                 the final, complete, and exclusive understanding between the
                 parties and supersedes all previous agreements, understandings,
                 or arrangements between the parties with respect to its subject
                 matter.

          9.1.2  No modification or waiver of any terms or conditions hereof,
                 nor any representations or warranties will be of any force or
                 effect unless such modification or waiver is in writing and
                 signed by an authorized officer of the party against whom
                 enforcement is sought.

     9.2  Force Majeure. Neither party will be liable to the other for its
          -------------
          failure to perform any of its obligations under this Agreement only
          during any period in which such performance is delayed because of, or
          rendered impracticable or impossible due to, circumstances beyond its
          reasonable control, including but not limited to, strike, fire, flood,
          earthquake, windstorm, governmental acts or orders or restrictions
          (including acts of regulatory authorities and changes in the
          regulatory scheme for a Product), failure of suppliers , or any other
          reason to the extent that the failure to perform is beyond the
          reasonable control and not caused by the negligence or willful
          misconduct of the non-performing party, provided that the party
          experiencing the delay promptly notifies the other of the delay.

     9.3  Notices.  All notices concerning this Agreement will be written in the
          -------
          English language and will be deemed to have been received (a) two days
          after being properly sent by commercial overnight courier, or (b) one
          day after being transmitted by confirmed facsimile, in each case
          addressed to the address below:

CONFIDENTIAL                         Xenograft Distribution Agreement - Page 10


      If to Tutogen:

      Tutogen Medical GmbH
      IndustriestraBe 6,
      D-91077 Neunkirchen am Brand
      GERMANY
      Attention: President and CEO
      Telephone: 49 (9134) 99 88 110
      Facsimile: 49 (9134) 99 88 119

      With a copy to:

      Dr. Dirk Lange
      Foerster + Rutow
      Irrestr. 17-19
      90403 Nurnberg
      GERMANY
      Telephone: 49 (911) 23 569 00
      Facsimile: 49 (911) 23 569 11

      If to Sulzer:

      Sulzer Calcitek Inc.
      1900 Aston Avenue
      Carlsbad, California 92008-7308
      U.S.A.
      Attention: President
      Telephone: 1 (760) 431-9515
      Facsimile: 1 (760) 431-9753

      With a copy to:

      Sulzer Medica USA Inc.
      3 East Greenway Plaza, Suite 1600
      Houston, Texas 77046
      U.S.A.
      Attention: General Counsel
      Telephone: 1 (713) 561-6365
      Facsimile: 1 (713) 561-6380

 9.4  Governing Law.  Recognizing that the laws within different international
      -------------
      jurisdictions vary in their content and effect with respect to similar
      subject matter, and that the parties desire uniformity and predictability
      in interpretation and enforcement of this Agreement and related agreements
      with international scope made contemporaneously by the parties and their
      Affiliates, the parties have agreed to the following provisions regarding
      applicable law to govern this Agreement: All matters affecting the
      interpretation, form, validity, and performance of this Agreement shall be
      decided under the laws of Switzerland. The United Nations Convention on
      Contracts for the International Sale of Goods of April 11, 1980 shall not
      be applicable.

CONFIDENTIAL                         Xenograft Distribution Agreement - Page 11


 9.5  Partial Invalidity.  In the event that any provision of this Agreement
      ------------------
      will be unenforceable or invalid under any applicable law or be so held by
      applicable court decision, such unenforceability or invalidity will not
      render this Agreement unenforceable or invalid as a whole, and, in such
      event, such provision will be changed and interpreted so as best to
      accomplish the objectives of such unenforceable or invalid provision
      within the limits of the applicable law or applicable court decisions.

 9.6  Independent Contractors.  Each party will act as an independent contractor
      -----------------------
      under the terms of this Agreement. Except as otherwise provided in this
      Agreement, neither party is, nor will it be deemed to be, an employee,
      agent, partner, co-venturer, or legal representative of the other for any
      purpose.

 9.7  Nonassignability. Neither this Agreement nor any of the rights, interests,
      ----------------
      duties, or obligations under this Agreement shall be assigned or
      delegated, in whole or in part, by operation of law or otherwise by any
      party without the prior written consent of the other party, except that
      either party may assign this Agreement to an Affiliate of such party;
      provided that, in no event shall a party assign to an Affiliate less than
      the entirety of its rights and obligations under this Agreement. Any
      assignment made in violation of this Section 9.7 will be void and of no
      effect. Subject to this Section 9.7, this Agreement shall be binding upon,
      inure to the benefit of, and be enforceable by and against, the parties
      and their Permitted Successors.

 9.8  Compliance With Laws.  Notwithstanding other provisions in this Agreement
      --------------------
      regarding a failure to comply with laws, in performing this Agreement,
      each Party shall comply with all laws and government regulations
      applicable in a particular country at all times.

 9.9  Arbitration.
      -----------

       9.9.1  In the event the Parties are unable to resolve any dispute or
              conflict arising from or relating to this Agreement within thirty
              (30) days after it is formally presented for resolution by written
              notice, any party may submit such conflict for resolution to the
              Chief Executive Officers of the parties.

       9.9.2  In the event the Chief Executive Officers of the parties are
              unable to resolve such conflict within thirty (30) days after
              having such conflict submitted to them for resolution, the
              disputes shall be finally settled under the Rules of Conciliation
              and Arbitration of the International Chamber of Commerce in Paris
              ("Rules") by three arbitrators appointed in accordance with the
              Rules.

       9.9.3  The place of arbitration shall be Zurich.  The procedural law of
              this place shall apply where the Rules are silent.

       9.9.4  The arbitral award shall be substantiated in writing. The arbitral
              tribunal shall decide on the matter of costs of the arbitration.

       9.9.5  The language to be used in the arbitral proceedings shall be
              English.


CONFIDENTIAL                         Xenograft Distribution Agreement - Page 12


 9.10  Confidentiality.  The parties acknowledge that by reason of their
       ---------------
       relationship hereunder, each has had and will continue to have access to
       certain information and materials concerning the other's business, plans,
       customers, technology, and/or products that is considered by a party to
       be confidential ("Confidential Information") and of substantial value to
       that party, which value would be impaired if such information were
       disclosed to third parties. To the extent that such information is
       considered confidential, the disclosing party will so indicate to the
       receiving party, in the case of information in documentary or other
       tangible form, by labeling it conspicuously as "CONFIDENTIAL" (or words
       of similar import) and in the case of information conveyed verbally, by
       identifying same in writing within ten days after the first verbal
       disclosure. Each party agrees that it will not use in any way other than
       as expressly authorized or contemplated under this Agreement, nor
       disclose to any third party, any such Confidential Information revealed
       to it by the other party, and will take commercially reasonable
       precautions (and will cause its Affiliates to take commercially
       reasonable precautions) to protect the confidentiality of such
       information and with no less restrictive precautions than it takes to
       protect its own confidential information. Each party will disclose
       Confidential Information only to those of its employees who have a need
       to know such information. If Confidential Information is required to be
       disclosed in response to an order by a court or other government body, or
       if otherwise required to be disclosed by law, or if necessary to
       establish the rights of a party under this Agreement, the receiving party
       shall use commercially reasonable efforts to provide the disclosing party
       with advance notice of such required disclosure to give the disclosing
       party sufficient time to seek a protective order or other protective
       measures, if any are available, for such Confidential Information.
       "Confidential Information" does not include information, materials,
       technical data or know-how which: (i) is rightfully in the possession of
       the receiving party at the time of disclosure as shown by the receiving
       party's files and records immediately prior to the time of disclosure;
       (ii) prior to or after the time of disclosure becomes part of the public
       knowledge or literature, not as a result of any inaction or action of the
       receiving party; (iii) is independently developed by a party without the
       use of any Confidential Information of the other parties; (iv) is
       obtained from any third party who is authorized to disclose such data and
       information without obligation of confidentiality, or (v) is approved for
       release by the disclosing party. This Section 9.10 shall survive
       termination of this Agreement for a period of two years.


CONFIDENTIAL                         Xenograft Distribution Agreement - Page 13


 9.11  Public Relations And Announcements.  The parties shall agree upon and
       ----------------------------------
       issue a press release upon the signing of this Agreement including a
       summary of the relationship established under this Agreement. No party
       shall issue a press release or any other published statement that refers
       to another party, its Affiliates or the other party's products without
       first obtaining the agreement of such other party as to the form and
       content of the statement, which approval shall be timely and not
       unreasonably withheld.

          In witness whereof, the parties have each caused this Agreement to be
       signed and delivered by their duly authorized representatives on the
       dates set forth below in duplicate, each of which will be treated for all
       purposes as an original.


       Tutogen Medical GmbH                       Sulzer Calcitek Inc.


    By: /s/ Manfred Kruger                      By: /s/ Steven E. Hanson
        ------------------                          --------------------
          Manfred Kruger                              Steven E. Hanson
          Managing Director                           President



    Date: September 29, 2000                   Date: September 29, 2000
          ------------------                         ------------------

CONFIDENTIAL                         Xenograft Distribution Agreement - Page 14


                             Schedule A - Products



- -------------------------------------------------------------------------------------------------
         Description                 Particle Size (microns)             Tissue Volume (cc)
- -------------------------------------------------------------------------------------------------
                                                                   
Bovine Cancellous Chips                       250-1000                             0.5
- -------------------------------------------------------------------------------------------------
Bovine Cancellous Chips                       250-1000                             1.0
- -------------------------------------------------------------------------------------------------
Bovine Cancellous Chips                      1000-2000                             0.5
- -------------------------------------------------------------------------------------------------
Bovine Cancellous Chips                      1000-2000                             1.0
- -------------------------------------------------------------------------------------------------
Bovine Cancellous Chips                      1000-2000                             2.0
- -------------------------------------------------------------------------------------------------


CONFIDENTIAL             Schedule A to Xenograft Distribution Agreement - Page 1


                        Schedule B - Minimum Sales Goals


Contract Year 1
- ---------------

     No Minimum Sales

Contract Year 2
- ---------------

     No Minimum Sales

Contract Year 3
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                   ______________

          Eastern Europe                   ______________

          South America                    ______________

          Far East                         ______________

          Japan                            ______________

          Middle East                      ______________

          Canada                           ______________



Contract Year 4
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                   ______________

          Eastern Europe                   ______________

          South America                    ______________

          Far East                         ______________

          Japan                            ______________

          Middle East                      ______________

          Canada                           ______________

CONFIDENTIAL             Schedule B to Xenograft Distribution Agreement - Page 1


Contract Year 5
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                     ______________

          Eastern Europe                     ______________

          South America                      ______________

          Far East                           ______________

          Japan                              ______________

          Middle East                        ______________

          Canada                             ______________

Contract Year 6
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                     ______________

          Eastern Europe                     ______________

          South America                      ______________

          Far East                           ______________

          Japan                              ______________

          Middle East                        ______________

          Canada                             ______________

Contract Year 7
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                ______________

          Eastern Europe                ______________

          South America                 ______________

          Far East                      ______________

          Japan                         ______________

          Middle East                   ______________

CONFIDENTIAL             Schedule B to Xenograft Distribution Agreement - Page 2


          Canada                        _______________

Contract Year 8
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                ______________

          Eastern Europe                ______________

          South America                 ______________

          Far East                      ______________

          Japan                         ______________

          Middle East                   ______________

          Canada                        ______________

Contract Year 9
- ---------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                     ______________

          Eastern Europe                     ______________

          South America                      ______________

          Far East                           ______________

          Japan                              ______________

          Middle East                        ______________

          Canada                             ______________

Contract Year 10
- ----------------

          Sub-Territory      Minimum Sales Goals (Total Product Units)
          -------------      -----------------------------------------

          Western Europe                     ______________

          Eastern Europe                     ______________

          South America                      ______________

          Far East                           ______________


CONFIDENTIAL             Schedule B to Xenograft Distribution Agreement - Page 3


          Japan                              ______________

          Middle East                        ______________

          Canada                             ______________


CONFIDENTIAL             Schedule B to Xenograft Distribution Agreement - Page 4


                          Schedule C - Transfer Price


The Transfer Price for the Products during the First Contract Year is set forth
in the table below.

- --------------------------------------------------------------------------------
                       Product                                  Transfer Price
- --------------------------------------------------------------------------------
Bovine Cancellous Chips, 250-1000 micro, 0.5 cc                        *
- --------------------------------------------------------------------------------
Bovine Cancellous Chips, 250-1000 micro, 1.0 cc                        *
- --------------------------------------------------------------------------------
Bovine Cancellous Chips, 1000-2000 micro, 0.5 cc                       *
- --------------------------------------------------------------------------------
Bovine Cancellous Chips, 1000-2000 micro, 1.0 cc                       *
- --------------------------------------------------------------------------------
Bovine Cancellous Chips, 1000-2000 micro, 2.0 cc                       *
- --------------------------------------------------------------------------------

Sulzer and Tutogen shall confer and agree upon the amount of Transfer Price
after the first Contract Year.



            *CONFIDENTIAL TREATMENT REQUEST BY SHEARMAN & STERLING.

CONFIDENTIAL             Schedule C to Xenograft Distribution Agreement - Page 1