SPARTA PHARMACEUTICALS INC
10-Q/A, 1996-07-17
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C.  20549

                                    FORM 10-Q/A
                            Amendment No. 1 to Form 10-Q

(Mark One)

[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
     ACT OF 1934.  For the Quarterly Period Ended: 
      March 31, 1996; or

[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934.  For the transition period from     to      .
                                                           ---    -----
      
                             Commission File Number 
                                     0-23076

                           Sparta Pharmaceuticals, Inc.                         
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)
                                                                  
                                                                        
                                                                                
                                                                                
   
       Delaware                                           56-1755527            
- ------------------------------------       -------------------------------------
  (State of incorporation)                   (IRS Employer Identification No.)
  

             111 Rock Rd.                         Horsham, PA 19044             
- --------------------------------------------------------------------------------
          (Address of principal executive offices, including zip code)


                                 (215) 442-1700
               ---------------------------------------------------
              (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

Yes    X          No        
    -------          -------

As of May 10, 1996, there were outstanding 8,190,931 shares of Common Stock,
$.001 par value per share.


                                        1

<PAGE>


     This Form 10-Q/A Amendment No. 1 to the Form 10-Q of Sparta 
Pharmaceuticals, Inc. (the "Company") filed for the quarterly period ended 
March 31, 1996 amends and restates the information regarding Exhibit 10.70, 
Exhibit 10.71 and Exhibit 10.72. The copies of Exhibit 10.70A, Exhibit 10.71A 
and Exhibit 10.72A filed herewith omit portions of said exhibits for which the 
Company has requested confidential treatment from the Securities and Exchange 
Commission. The portions of said exhibits for which confidential treatment has 
been requested are marked "[    ]" in each exhibit.


                                        2



<PAGE>
                            PART II-OTHER INFORMATION

ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K

The following documents are filed as Exhibits hereto.

Exhibit 
Number                              Description
- ------                             ------------

 !10.70A          -- Evaluation and option agreement between Lexin
                     Pharmaceutical Corporation and Astra Merck, Inc.
                     dated as of October 25, 1995. (Assigned to Registrant
                     pursuant to the Lexin purchase)
 !10.71A          -- Collaborative Research and Licensing Agreement between
                     Lexin Pharmaceutical Corporation and Wichita State
                     University dated as of April 1, 1994. (Assigned to 
                     Registrant pursuant to the Lexin purchase)
 !10.72A          -- License Agreement between PI Research Corporation
                     (predecessor in name to Lexin Pharmaceutical
                     Corporation) and the Trustees of The University of
                     Pennsylvania dated as of January 2, 1992. (Assigned to
                     Registrant pursuant to the Lexin purchase) 

                                                   
- -----------------

!             Confidential Treatment has been requested from the
              Securities and Exchange Commission
         

                                          3 

<PAGE>


Signatures

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


                            Sparta Pharmaceuticals, Inc.

July 16, 1996    By: /s/  Jerry B. Hook       President and Chief Executive
- -------------        ------------------------ Officer (principal  executive 
 Date                Jerry B. Hook, Ph.D.     officer) and Director



                                           
July 16, 1996    By: /s/ Ronald H. Spair      Vice President and Chief Financial
- -------------      -------------------------  Officer (principal Financial 
 Date              Ronald H.Spair             Officer)


                                      4




                                                               Exhibit 10.70A


SPARTA PHARMACEUTICALS, INC. HAS OMITTED FROM THIS EXHIBIT 10.70A PORTIONS OF
THE AGREEMENT FOR WHICH SPARTA PHARMACEUTICALS, INC. HAS REQUESTED CONFIDENTIAL
TREATMENT FROM THE SECURITIES AND EXCHANGE COMMISSION. THE PORTIONS OF THE
AGREEMENT FOR WHICH CONFIDENTIAL TREATMENT HAS BEEN REQUESTED ARE MARKED
"[   ]" AND SUCH CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE
SECURITIES AND EXCHANGE COMMISSION.


                    EVALUATION AND OPTION AGREEMENT
                    -------------------------------

    EVALUATION AND OPTION AGREEMENT, dated as of October 25,1995, by

and between Astra Merck Inc., a Delaware corporation ("AMI") and Lexin

Pharmaceutical Corporation, a Pennsylvania corporation ("Lexin").

    IN CONSIDERATION of the respective covenants, representations,

warranties and agreements set forth herein, and intending to be legally

bound hereby, the parties hereto, hereby agree as follows:


                               ARTICLE I

                      EVALUATION AND OPTION GRANT
                      ---------------------------

    1.1. Payment by AMI. Subject to the terms and conditions hereof,
         --------------
and in consideration of the evaluation and option grant set forth in

Section 1.2, AMI shall pay to Lexin the sum of [     ] within thirty days 

from the date of this Agreement to be used solely for the purpose of

conducting animal studies of LEX 032 in the treatment of pancreatitis.

The studies shall be completed by Lexin within 180 days from the date

of this Agreement and, subject to the terms and conditions hereof, the

results of the studies shall be available for use by AMI.

    1.2. Evaluation and Option Grant. Lexin hereby grants to AMI
         ---------------------------

an exclusive and irrevocable right to evaluate (i) Patents (as

hereinafter defined) and any intellectual property rights relating

thereto, and (ii) all data, information, know-how and materials,

whether existing now or in the future, relating to the

manufacture, use, stabilization, design and testing of LEX 032 for

the treatment of pancreatitis (collectively, the "Technology")

during the period commencing on the date of this Agreement and

ending [    ] year following the receipt of a written report summarizing

the data from the animal studies (the "Period"). Further, Lexin

hereby grants to AMI an exclusive and irrevocable option (the

"Option"), exercisable at any time during the Period, to obtain an

exclusive license under the Patents and
<PAGE>
the Technology for the United States of America, including its

territories, possessions, and Puerto Rico (collectively, the

"Territory"), for the human pharmaceutical treatment of pancreatitis or

other diseases of the gastrointestinal system (whether by prescription,

over-the-counter or otherwise) (the "Field"). During the Period, Lexin

shall not provide to any other party access to the Patents or the

Technology which has not already been provided prior to the date

hereof, or solicit or accept offers to negotiate or otherwise discuss

commercial opportunities regarding the Patents or the Technology for

use in the Field. The Option includes the grant by Lexin to AMI's

parent, Astra AB, of an exclusive option during the Period to negotiate

an agreement for the development and commercialization of products in

the Field and outside the Territory.


    For the purposes of this Agreement, the term "Patents" means (i)

all information relating to those patent applications and any division,

continuation, or continuation-in-part thereof and unexpired United

States patents set forth on Schedule 1.1, any United States patents

granted on the basis of the patent applications set forth in Schedule

1.1 and any division, continuation  or continuation-in-part thereof;

and (ii) any reissue or extension of any of the foregoing patents.


    1.3. Representation and Warranty for Technology. Except as
         ------------------------------------------

otherwise set forth in Schedule 1.3, Lexin represents and warrants to

AMI that (i) to the best of its knowledge, the intellectual property

rights related to Patents and the Technology are subsisting and are not

invalid or unenforceable, in whole or in part; (ii) Lexin has the full

right, power and authority to grant all of the right, title and

interest in the Patents and the Technology under Section 1.2 hereof;

(iii) Lexin has not previously licensed, assigned, transferred,

conveyed or otherwise encumbered such right, title and interest; (iv)

Lexin is the sole and exclusive owner or licensee of the Patents and

the Technology, all of which is free and clear of any liens, charges

and encumbrances, and, except for the licensors listed in Schedule 1.1

hereto, to the best of its knowledge, no other person, corporate or

other private entity, or governmental entity or subdivision thereof has

or shall have any claim of ownership with respect to the Patents or the

Technology; (v) there are no claims, judgments or settlements to be

paid by

                                   -2-
<PAGE>
         the Lexin relating to the Patents or Technology or claims pending

         litigation relating thereto; and (vi) Lexin knows no basis for any

         claims that the Patents or Technology infringes the patents,

         copyrights, trade secrets or other proprietary rights of third parties.

             1.40 Evaluation by AMI. AMI shall evaluate the Patents and the
                  -----------------

         Technology as it deems appropriate in its sole discretion during the

         Period. Lexin shall cooperate with AMI by providing data, information

         and reasonable assistance, including but not limited to, scientists

         participating in face to face scientific meetings with AMI scientists,

         as necessary, so as to enable AMI to properly evaluate the Patents and

         the Technology.


             1.50 Exercise of Option: Terms Of Definitive Agreement. At any time
                  -------------------------------------------------
         during the Period, AMI may exercise the Option (and Astra AB may

         exercise its option described in the last sentence of the first

         paragraph of Section 1.2 hereof) by providing written notice thereof to

         Lexin. Immediately following such notification, the parties shall

         commence negotiations on a definitive agreement(s) and Lexin shall

         grant to AMI and/or Astra AB all rights by an exclusive, sublicensable,

         royalty-bearing license under all know-how and patents arising from the

         Patents to make, have made, use and sell human pharmaceutical products

         (i) in the Field in the Territory (for AMI), and (ii) in the Field

         outside the Territory (for Astra AB), utilizing the Technology pursuant

         to a definitive agreement(s). Such definitive agreement(s) shall

         contain such reasonable terms and conditions which are typical in the

         industry. Such terms shall include, without limitation, that AMI (or

         Astra AB) may terminate the license agreement at any time for any

         reason and that the term of the agreement shall be until the last to

         expire patent licensed thereunder. The proposal by AMI (or Astra AB)

         for the definitive agreement shall include a reasonable compensation

         for the Technology, which compensation may include a reasonable

         royalty. If the parties cannot agree on the terms of the agreement, the

         parties shall submit the matter to arbitration in accordance with

         Article II.

             1.6. Additional Rights. For so long as AMI and Lexin are either in
                  -----------------

         good faith negotiating a definitive agreement in the Field or

         performing under the terms of such definitive agreement, AMI may elect,

         in its sole discretion, to enter into negotiations with

                                   -3-
<PAGE>
         Lexin for exclusive rights to additional applications for compounds

         with a similar mechanism of action or clinical potential as LEX 032, in

         or out of the Field ("Additional Applications") on such terms and

         conditions as the parties may mutually agree, if AMI notifies Lexin of

         its election at any time during the Period or the term of the

         definitive agreement, as the case may be. If AMI makes the foregoing

         election, the parties shall determine in good faith the terms under

         which AMI will have exclusive rights during the Period or the term of

         the definitive agreement, as applicable, to negotiate a definitive

         agreement with Lexin with respect to each such Additional Application.

         If Lexin desires to actively solicit or is approached by a third party

         to negotiate commercial opportunities relating to any Additional

         Application during the Period or the term of the definitive agreement,

         as applicable, Lexin agrees first to provide written notice of such

         intention to AMI. AMI shall have a period of thirty (30) days after

         receipt of such notice during which to advise Lexin as to whether it

         desires to negotiate a definitive agreement with respect to such

         Additional Application, and if it desires to do so, an additional sixty

         (60) day period to negotiate such agreement before Lexin may actively

         solicit or negotiate with another party. If AMI elects not to

         negotiate, then Lexin shall be free to negotiate with third parties as

         to that Additional Application.


             Notwithstanding the foregoing, if AMI elects to negotiate for such

         exclusive rights and the parties fail to consummate a definitive

         agreement with respect thereto, for a period of one (1) year following

         the expiration of AMI's negotiation period, Lexin may not grant rights

         to exploit commercial opportunities with respect to such Additional

         Application using the Patents or the Technology to any third party on

         terms which are in the aggregate materially more favorable than those

         last offered to AMI without first offering such terms to AMI, which AMI

         shall have a period of 30 days to accept. Lexin's obligations under the

         immediately preceding sentence shall survive the termination or

         expiration of this Agreement.

                                   -4-
<PAGE>
                                  ARTICLE II 

                                  ARBITRATION
                                  -----------


             2.1. Arbitration. If the terms of the definitive agreement for
                  -----------

         AMI's Option under Section 1.5 are submitted to arbitration hereunder,

         the matter shall be settled by arbitration by a board of arbitrators

         consisting of an arbitrator appointed by AMI, an arbitrator appointed

         by Lexin and a third arbitrator chosen by the mutual agreement of AMI

         and Lexin, which third arbitrator shall be unrelated either to AMI or

         Lexin. Such arbitration proceedings shall be held in Philadelphia,

         Pennsylvania and shall be held in accordance with the then current

         rules of the American Arbitration Association. Arbitration may be

         commenced at any time by either party hereto giving written notice to

         the other party to a dispute that such dispute has been referred to

         arbitration. The arbitrators shall determine a reasonable price, rate

         and other terms based on the guidelines set forth in this Agreement and

         with reasonable terms based on those typical in the industry and the

         offers or proposals of each party and shall enforce the obligations of

         Lexin and AMI to license the Technology on such terms pursuant to a

         reasonable definitive agreement, the terms of which shall also be

         subject to this arbitration provision should the parties be unable to

         reach agreement. Any award rendered by the arbitrators shall be

         conclusive and binding upon the parties hereto provided, however, that

         any such award shall be accompanied by a written opinion of the

         arbitrators giving the reasons for the award. The provision for

         arbitration shall be specifically enforceable by the parties and the

         decision of the arbitrators in accordance herewith shall be final and

         binding and there shall be no right of appeal therefrom. Each party

         shall pay its own expenses of arbitration and the expenses of the

         arbitrators shall be equally shared, provided, however, that if in the

         opinion of the arbitrators any claim hereunder or any defense or

         objection thereto was unreasonable, the arbitrators may assess, as part

         of their award, all or any part of the arbitration expenses of the

         other party (including reasonable attorneys' fees) and of the

         arbitrators against the party raising such unreasonable claim, defense

         or objection. The arbitration proceeding shall be conducted in English.

                                   -5-
<PAGE>
                                ARTICLE III 

                                MISCELLANEOUS
                                -------------


             3.1. Confidentiality. AMI and Lexin agree that all information
                  ---------------

         relating to the Technology and the terms of this Agreement, disclosed

         by either party in accordance with this Agreement shall be maintained

         by the receiving party in secrecy, and each will use all reasonable

         diligence to prevent disclosure, except to necessary personnel and,
                                                     
         with respect to AMI, necessary personnel of its affiliates. AMI's and

         Lexin's obligations under this Section 3.1 shall be limited to a period

         of five years from the date of this Agreement. The parties shall not

         have any obligation of confidentiality with respect to any information

         that is: (a) in the public domain, other than by a breach of this

         Agreement on the part of the receiving party; (b) rightfully received

         from a third party without any obligation of confidentiality; (c)

         rightfully known to the receiving party without any limitation on use

         or disclosure prior to its receipt from the disclosing party as

         documented in written records; (d) generally made available to third

         parties by the disclosing party without restriction on disclosure; or

         (e) independently developed by the receiving party as documented in

         written records. Any and all information received by either party from

         the other, upon request shall be promptly returned, except that the

         receiving party may retain one copy of such information in its

         confidential files, solely for record purposes.


             3.2. Publication. AMI and Lexin each acknowledge the other party's
                  -----------

         interest in publishing to obtain recognition within the scientific

         community and to advance the state of scientific knowledge. Each party

         also recognizes the mutual interest in obtaining valid patent

         protection and in protecting business interests and trade secret

         information. Consequently, a party wishing to make a publication shall

         deliver to the other party a copy of the proposed written publication

         or an outline of an oral disclosure at least sixty days prior to

         submission for publication or presentation. The reviewing party shall

         have the right to propose modifications to the publication for patent

         reasons, trade secret reasons or business reasons or to request a

         reasonable delay in publication or presentation in order to protect

         patentable information. If a reviewing party requests a delay, the

         publishing party shall delay

                                   -6-
<PAGE>
         submission or presentation for a period of ninety days to enable patent

         applications protecting each party's rights in such information to be

         filed. Upon expiration of such ninety days, the publishing party shall

         be free to proceed with the publication or presentation. If a reviewing

         party requests modifications to the publication, the publishing party

         shall edit such publication to prevent disclosure of trade secret or

         proprietary business information prior to submission of the publication

         or presentation.


             3.3. Governing Law. The interpretation and construction of this
                  -------------

         Agreement, and all matters relating hereto, shall be governed by the

         laws of the Commonwealth of Pennsylvania applicable to agreements

         executed and to be performed solely within such Commonwealth without

         reference to principles of conflicts of laws.


             3.4. Enforcement. Each party shall have the right at all times to
                  -----------

         enforce the provisions of this Agreement in strict accordance with the

         terms hereof notwithstanding any conduct or custom on its part in

         refraining from doing so at any time. The failure of any party at any

         time to enforce its rights hereunder strictly in accordance with the

         same shall not be construed as having created a custom contrary to the

         specific provisions hereof or as having in any way modified or waived

         the same.


             3.5. Notices. Any notice, request, demand, waiver, consent,
                  -------

         approval or other communication which is required or permitted

         hereunder shall be in writing and shall be deemed given only if

         delivered personally or sent by a telegram or telecopier (with

         transmission confirmed) or by registered or certified mail, return

         receipt requested and postage prepaid, or by federal express or an

         equivalent overnight delivery service, addressed

                                   -7-
<PAGE>
         to the parties at their respective addresses as set forth below or to

         such other addresses at which notice of change shall have been duly

         given.


                   If to AMI, to:

                        Astra Merck Inc.
                        725 Chesterbrook Boulevard
                        Wayne, Pennsylvania 19087-5677
                        Attention: Executive Director of Licensing and Business
                        Development

                   If to Lexin, to:

                        Lexin Pharmaceutical Corporation 
                        Rock Plaza III, 111 Rock Road 
                        Horsham, Pennsylvania 19044-2310 
                        Attention: Jerry B. Hook, Ph.D.

         Such notice, request, demand, waiver, consent, approval or other
 
         communication shall be deemed to have been given as of the date so

         delivered, telegraphed, or telecopied, or on the fifth day after

         deposit in the United States mail, or on the second day after the

         deposit with Federal Express or an equivalent overnight delivery

         service. It is understood and agreed that this Section 3.5 is not

         intended to govern the day-to-day business communications necessary

         between the parties in performing their duties, in due course, under

         the terms of this Agreement.

             3.6. Entire Agreement. This Agreement constitutes the entire
                  ----------------

         agreement between the parties with respect to the subject matter hereof

         and all prior agreements with respect thereto are superseded hereby and

         each party confirms that it is not relying on any representations or

         warranties of the other party except as specifically set forth herein,

         No amendment or modifications hereof shall be binding upon the parties

         unless in writing and duly executed by authorized representatives of

         both parties.

             3.7. Binding Effect; Assignment. This Agreement shall inure to the
                  --------------------------
         benefit of and be binding upon the parties and their respective

         successors and permitted assigns. Neither party shall assign this

         Agreement or any of its rights or obligations hereunder without the

                                   -8-
<PAGE>
         prior written consent of the other party, except that Lexin may assign

         its rights and obligations to any entity with which it may merge or

         consolidate, or to which it may transfer substantially all of its

         assets to which this Agreement relates.


             3.8. Survival. The respective rights and obligations of the parties
                  --------

         hereunder shall indefinitely survive the termination or expiration of

         this Agreement to the extent necessary to the intended preservation of

         such rights and obligations.


             3.9. Schedules. All schedules referred to herein or referred to in
                  ---------

         any schedule hereto are intended to be, and hereby are, specifically

         incorporated herein and made a part of this Agreement.


             3.10. Counterparts. This Agreement may be executed in one or more
                   ------------

         counterpart copies, each of which shall be deemed an original and all

         of which taken together shall be deemed to constitute one and the same

         instrument. This Agreement shall become binding when one or more

         counterparts taken together shall have been executed and delivered by

         the parties.


             3.11. Press Releases. Except as required by applicable law, neither
                   --------------

         of the parties hereto shall give notice to any third parties or

         otherwise make any public statement or releases concerning this

         Agreement or the transactions contemplated hereby without obtaining the

         prior written consent of the other party to this Agreement as to the

         contents and manner of presentation and publication thereof, which

         consent shall not be unreasonably withheld.


             3.12. Severability. If any one or more provisions of this Agreement
                   ------------

         shall be held to be invalid, illegal or unenforceable, the validity,

         legality or enforceability of the remaining provisions hereof shall not

         in any way be affected or impaired thereby. To the extent permitted by

         applicable law, each party waives any provision of law which renders

         any provision of this Agreement invalid, illegal or unenforceable in

         any respect. In the event any provision shall be held invalid, illegal

         or unenforceable the parties shall use their best efforts

                                   -9-
<PAGE>
         to substitute a valid, legal and enforceable provision which, insofar

         as practical, implements the purposes hereof.


             3.13. Further Assurances. Each party shall execute such other
                   ------------------

         instruments, give such further assurances and perform such acts which

         are or may become necessary or appropriate to effectuate and carry out

         the provisions of this Agreement.


             3.14. Headings. The article and section headings herein are for
                   --------

         reference purposes only and shall not affect the meaning or

         interpretation hereof.


             IN WITNESS WHEREOF, the parties have caused this Agreement to be

         executed by their officers thereunto duly authorized as of the date

         first set forth above.


           LEXIN PHARMACEUTICAL CORPORATION            ASTRA MERCK INC.


         By: /s/ Jerry B. Hook                         By: /s/ Wayne P. Yetter
             -------------------------------           -----------------------
             Jerry B. Hook                             Wayne P. Yetter
             President and Chief                       President and Chief
             Executive Officer                         Executive Officer

                                   -10-


                                                               Exhibit 10.71A



SPARTA PHARMACEUTICALS, INC. HAS OMITTED FROM THIS EXHIBIT 10.71A PORTIONS OF
THE AGREEMENT FOR WHICH SPARTA PHARMACEUTICALS, INC. HAS REQUESTED CONFIDENTIAL
TREATMENT FROM THE SECURITIES AND EXCHANGE COMMISSION. THE PORTIONS OF THE 
AGREEMENT FOR WHICH CONFIDENTIAL TREATMENT HAS BEEN REQUESTED ARE MARKED 
"[   ]" AND SUCH CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE 
SECURITIES AND EXCHANGE COMMISSION.


                      COLLAB0RATIVE RESEARCH AND LICENSING AGREEMENT
                      ----------------------------------------------

             This Agreement, dated as of the 1st of April, 1994, between Lexin
         Pharmaceutical Corporation, Pennsylvania Business Campus, Rock Plaza
         III, 111 Rock Road, Horsham, PA 19044-2310 ("LEXIN") and Wichita  
         State University, 1845 N.  Fairmount Avenue, Wichita, Kansas 
         67206-0007 ("UNIVERSITY").

                                       WITNESSETH:

             WHEREAS, UNIVERSITY and LEXIN possess certain know-how in the field
         of small and large serine protease inhibitors for all uses and
         applications (except agricultural uses and applications) and all
         aspects of molecular interaction with serine proteases;

             WHEREAS, UNIVERSITY, on behalf of William C. Groutas, Ph.D. ("DR.
         GROUTAS"), is desirous of and prepared to conduct collaborative 
         research in this field which may lead to the development of 
         commercial products;

             WHEREAS, LEXIN is prepared to provide support to UNIVERSITY for
         such research by DR. GROUTAS, providing it receives certain license
         rights under inventions, biological materials, and/or know-how; and

             WHEREAS, UNIVERSITY represents, subject to potential rights under
         Article III.D hereof, that it has full rights by assignment to such
         inventions, biological materials, and/or know-how and wishes to have
         such inventions, biological materials, and/or know-how perfected and
         marketed in order that products resulting therefrom might be available
         for public use and benefit; and

             WHEREAS, UNIVERSITY represents, subject to potential rights under
         Article III.D hereof, and warrants to LEXIN that: (i) it has full right
         and authority to enter into this Agreement without consent or approval
         of any other party; and (ii) it is not subject to any restrictions
         which would prevent or impair the grant to LEXIN of the licenses.

             NOW, THEREFORE, for valuable consideration, the receipt and
         adequacy of which are hereby acknowledged, and intending to be legally
         bound, the parties hereto mutually agree as follows:
<PAGE>
                                 ARTICLE I - DEFINITIONS
                                 -----------------------

             A.    Research Program. The term "Research Program" shall refer to
                   ----------------
         the work outlined in Appendix A.

             B.    Licensed Invention. The term "Licensed Invention" shall mean
                   ------------------
         any and all technical information, trade secrets, developments,
         discoveries, know-how, methods, techniques, formulae, processes and
         other proprietary ideas, whether or not patentable or copyrightable,
         that are discovered, developed or reduced to practice arising out of
         the research performed under this Agreement, as set forth in Appendix
         A.

             C.    Patent Rights. The term "Patent Rights" shall mean United
                   -------------
         States or foreign patent application rights owned or controlled by
         UNIVERSITY which arise under any United States or foreign patent
         applications, or any patents issuing from said applications, including
         any divisions, continuations, continuations-in-part, re-examinations,
         or reissues thereof and patents of addition thereto, and cover the
         making, using, or selling of Product.

             D.    Product. The term "Product" shall mean any product derived
                   -------
         from a Licensed Invention used in the Field.

             E.    Net Sales. With respect to any quantity of Product subject to
                   ---------
         royalty under this Agreement that is sold by LEXIN or any of its
         sublicensees to any third party, the term "Net Sales" shall mean the
         gross invoice selling price for that quantity of Product, less: (a)
         discounts and allowances to customers,
         (b) credits for returned goods, (c) prepaid freight, (d) sales taxes or
         other governmental charges paid in connection with the sale; and (e)
         commissions and other fees paid to distributors and other sales
         agencies for or in connection with the sale of Product.

             F.    Affiliate. The term "Affiliate" shall mean any corporation,
                   ---------
         company, partnership and/or firm which controls or is controlled by or
         is under common control with LEXIN. For purposes of this Paragraph,
         control shall mean: (a) in the case of corporate entities, direct or
         indirect ownership of at least fifty per cent (50%) of the stock or
         participating shares entitled to vote for the election of directors;
         and (b) in the case of non-corporate entities, direct or indirect
         ownership of at least fifty percent (50%) of the equity interest or the
         power to direct the management and policies of such entity.

             G.    Effective Date. The term "Effective Date" shall mean the date
                   --------------
         first indicated above as the effective date of this Agreement.


                                   2
<PAGE>
             H.    Field. The term "Field" shall mean use for any diagnostic,
                   -----
         therapeutic and/or prophylactic purpose.

                       ARTICLE II - COLLABORATIVE RESEARCH PROGRAM
                       -------------------------------------------

             A.    For the one (1) year ending [              ] (the
         "Research Term"), LEXIN agrees, as as set forth below to pay
         UNIVERSITY funds to support the Research Program, and UNIVERSITY
         shall supply the services of requisite personnel and to furnish
         the necessary facilities to carry out such Research Program, all
         according to a Plan for Research and Budget agreed upon by LEXIN
         and UNIVERSITY as set forth in Paragraph B of this Article.

             B.    The Plan for Research and Budget for the Research Term
         is set forth in Appendix A hereto. The budget for the Research
         Term shall be $[        ], payable quarterly in advance.

             C.    The parties shall have the option to continue the Research
         Program for an additional period after the Research Term, under
         substantially identical terms as set forth herein; however, continued
         funding shall be solely at the discretion of LEXIN.

             D.    The Research Program shall be under the direction of DR.
         GROUTAS. In the event that the services of DR. GROUTAS become
         unavailable during the course of the Research Program, LEXIN may
         terminate the Research Program by giving written notice to UNIVERSITY
         and reimbursing UNIVERSITY for all previously incurred and
         noncancellable expenses for the Research Program.

             E.    UNIVERSITY shall report in writing to LEXIN the results and
         status of its research under this Agreement within fifteen (15) days
         after the end of each six (6) month period hereunder. At the conclusion
         of the Agreement, LEXIN shall receive a complete detailed report of the
         work carried out and funded by this Agreement. Further, DR. GROUTAS and
         the staff engaged on the Research Program shall be available at times
         mutually agreed upon for the purpose of discussing the progress of the
         Research Program. In the event of termination of the Research Program,
         LEXIN shall receive a final summary report of all work carried out and
         all inventions conceived and/or arising out of the research performed
         under this Agreement.

                                ARTICLE III- PATENT RIGHTS
                                --------------------------

             A.    UNIVERSITY will promptly inform LEXIN of any ideas,
         improvements and inventions arising out of the research performed under
         this Agreement solely by UNIVERSITY personnel or by UNIVERSITY
         personnel jointly with employees of LEXIN.


                                   3
<PAGE>
         Inventions, including biological materials, made solely by UNIVERSITY
         personnel and any patent applications and patents thereon shall be
         owned by UNIVERSITY. Inventions made jointly by UNIVERSITY personnel
         with LEXIN employees and any patent applications and patents thereon
         shall be jointly owned by UNIVERSITY and LEXIN.

             B.    UNIVERSITY shall be responsible for filing and prosecuting
         United States and foreign patent applications on inventions owned
         solely by UNIVERSITY. Both UNIVERSITY and LEXIN shall be mutually
         responsible for making decisions regarding the scope and content of any
         such applications and prosecution thereof. The expenses in connection
         with filing and prosecution of any applications for University-owned
         patents or patents jointly owned with LEXIN, United States and/or
         foreign and the maintenance of issued patents thereon shall be borne by
         LEXIN. All expenses incurred by LEXIN in applying for patent protection
         relating to inventions conceived by UNIVERSITY shall be creditable
         against any future royalty payments due UNIVERSITY by LEXIN; however,
         royalties due UNIVERSITY in any payment period shall not be reduced to
         less than 50% of what they otherwise would have been.

             C.    LEXIN shall be entitled to file and prosecute United States
         and/or foreign patent applications on jointly owned inventions.
         UNIVERSITY and LEXIN shall be jointly responsible for making decisions
         regarding the scope and content of applications and prosecution thereof
         on any such jointly owned inventions. UNIVERSITY will be expected to
         assist in assembling inventorship information and data for filing
         patent applications on jointly owned inventions. Decisions on when,
         where and whether to file on jointly owned inventions will be made by
         LEXIN after consulting with UNIVERSITY. The expenses in connection with
         filing and prosecution of any jointly owned patent applications, United
         States and/or foreign, and the maintenance of issued patents thereon
         shall be borne by LEXIN. All expenses incurred by LEXIN in applying for
         patent protection relating to inventions conceived jointly with
         UNIVERSITY shall be creditable against any future royalty payments due
         UNIVERSITY by LEXIN; however, royalties due UNIVERSITY in any payment
         period shall not be reduced to less than 50% of what they otherwise
         would have been.

             D.    LEXIN acknowledges that certain ideas, improvements and
         inventions arising out of the research performed under this Agreement
         by UNIVERSITY personnel may be subject to rights retained by the United
         States government in accordance with P.L. 96-517, as amended by P.L.
         98-620, and any regulations issued thereunder.


                                       4
<PAGE>
                              ARTICLE IV - LICENSE TO LEXIN
                              -----------------------------

             A.    In consideration of LEXIN's support for research and other
         consideration hereunder, UNIVERSITY hereby grants to LEXIN:

                   (1) an exclusive, worldwide license to make, have made, use,
                       sell and have sold Product derived from Licensed
                       Invention or deviations; and

                   (2) an exclusive, worldwide license under Patent Rights to
                       make, have made, use, sell and have sold Product.

             B.    The licenses granted by UNIVERSITY to LEXIN under Paragraph A
         of this Article shall include the right to grant sublicenses of no
         greater scope than the license granted to LEXIN hereunder.

             C.    During the term of this Agreement and so long as LEXIN is not
         in default with respect to any payment due to UNIVERSITY hereunder,
         UNIVERSITY will not assert Patent Rights or Licensed Patent to prevent
         any party from using or selling any quantity of Product on which
         royalty has been paid hereunder.

                      ARTICLE V - ROYALTIES AND OTHER CONSIDERATION
                      ---------------------------------------------

             A.    In  consideration of the licenses granted to LEXIN under this
         Agreement, LEXIN shall pay UNIVERSITY a royalty of [         
                     ] ([  ]) on the Net Sales of Product derived from Licensed
         inventions or deviations covered by a claim contained in an issued
         Patent Right on a country by country basis.

             B.    In the event that LEXIN or a sublicense of LEXIN must pay
         additional royalties to a third or additional parties to allow for
         commercialization of Product developed under this Agreement, LEXIN and
         the University shall agree to negotiate in good faith to consider
         whether offset of royalty payments is required based upon the
         circumstances and, if required, LEXIN shall have the right to reduce
         royalty payments to UNIVERSITY in a manner consistent with the need to
         offset such additional royalty payments.

                      ARTICLE VI - REPORTS, PAYMENTS AND ACCOUNTING
                      ---------------------------------------------

             A.    Upon first commercial sale of Product, LEXIN shall provide to
         UNIVERSITY, within ninety (90) days following each calendar quarter, a
         written report setting forth the total Net Sales and the royalty due
         and payable to UNIVERSITY for such quarter and LEXIN shall remit to
         UNIVERSITY with such report the


                                        5
<PAGE>
         amount of royalty payments shown thereby to be due. Royalties shall be
         payable from the country in which they are earned and subject to
         foreign exchange rates then prevailing in such country. Royalties shall
         be remitted in United States dollars. For converting any royalty that
         accrued in another currency into United States dollars, there shall be
         used the closing buying rates quoted by the [Morgan Guaranty Trust
         Company of New York, New York] for the last business day of the
         calendar quarter in which the royalties were earned.

             B.    LEXIN shall keep complete and accurate records for the latest
         three (3) years showing the Net Sales by LEXIN of Product made under
         this Agreement. Such records shall be in sufficient detail to enable
         the royalties payable hereunder by LEXIN to be determined. LEXIN agrees
         to permit such books and records to be examined but not more often than
         once in any calendar year. The examination shall be by an independent
         certified public accountant designated by UNIVERSITY and reasonably
         acceptable to and approved by LEXIN. Any such audit shall be at the
         expense of UNIVERSITY and conducted during business hours of LEXIN and
         upon reasonable notice to LEXIN. The purpose of any such audit shall
         solely be for verifying the royalties payable as provided for in this
         Agreement and said accountant shall only disclose Net Sales to
         UNIVERSITY and royalties due and payable thereon.

             C.    Any tax required to be withheld by LEXIN under the laws or
         governmental regulations of any country for royalties payable to
         UNIVERSITY shall be promptly paid by LEXIN for and on behalf of
         UNIVERSITY to the appropriate governmental authority. LEXIN shall
         furnish UNIVERSITY with proof of payment of such tax together with
         official or other appropriate evidence issued by the appropriate
         government authority sufficient to enable UNIVERSITY to support a claim
         for any income tax credit in respect of any tax so paid.

                            ARTICLE VII - TERM AND TERMINATION
                            ----------------------------------

             A.    This Agreement, unless terminated earlier as hereinafter
         provided, shall terminate on the [            ] anniversary of its 
         Effective Date or the expiration of the last of the patents licensed 
         hereunder on a country by country basis, whichever date shall last 
         occur, whereupon the exclusive licenses granted hereunder shall be 
         fully paid and LEXIN and its sublicensees shall be free to make, 
         have made, use and sell Product without further duties or 
         responsibilities to UNIVERSITY.

             B. If any of the terms or conditions of this Agreement are breached
         and such breach is not corrected within sixty (60) days after written
         notice thereof is given by a complaining  party to the breaching party,
         the complaining party shall have the option


                                        6
<PAGE>
         to terminate this Agreement by giving written notice thereof to the
         breaching party.

                               ARTICLE VIII - ASSIGNABILITY
                               ----------------------------

             LEXIN may, without the prior written consent of UNIVERSITY, assign
         this Agreement or any of its rights or obligations hereunder to an
         Affiliate. Such assignee may, without the prior written consent of
         UNIVERSITY, assign such Agreement or rights or obligations hereunder
         back to LEXIN or to an Affiliate without the prior written consent of
         UNIVERSITY. Neither this Agreement nor any of the rights or obligations
         of UNIVERSITY hereunder shall be assignable or otherwise transferable
         by UNIVERSITY without the prior written consent of LEXIN.

                            ARTICLE IX- DEVELOPMENT OF PRODUCT
                            ----------------------------------

             LEXIN shall use reasonable diligence in the development of Product
         and to introduce or cause the introduction of Product in the commercial
         market at a reasonable date.

                                 ARTICLE X - PUBLICATIONS
                                 ------------------------

             LEXIN reserves the right to approve publications resulting from the
         research under this Agreement in advance of submission for publication
         in order to protect its proprietary technology including biological
         materials, information and know-how. LEXIN shall have the final
         authority to determine the scope and content of any publication
         materials which contain information relating to LEXIN's proprietary
         technology including identification of or reference to biological
         materials supplied by LEXIN to UNIVERSITY, information and know-how.
         UNIVERSITY shall submit any prepublication materials to LEXIN for
         review and comment at least sixty (60) days prior to planned submission
         for publication. LEXIN shall notify UNIVERSITY within thirty (30) days
         of receipt of the prepublication materials of its intention to approve
         or withhold approval of the publication and state the reason for doing
         so; provided, however, that LEXIN shall not withhold approval for more
         than thirty (30) days to provide LEXIN the opportunity to file patents
         to protect its technology.
         Except as otherwise  provided herein, LEXIN may use the results of the
         Research Program for whatever purposes it may desire.


                                        7
<PAGE>
                            ARTICLE XI - STATUS OF THE PARTIES
                            ----------------------------------

             For purposes of this Agreement and in connection with any activity
         of UNIVERSITY hereunder, UNIVERSITY shall at all times be an
         independent contractor and not an employee or agent of LEXIN.
         UNIVERSITY's activities in connection with the Research Project will be
         conducted by UNIVERSITY at its own risk. UNIVERSITY shall have full
         authority and responsibility for its activities under the Collaborative
         Research Program. People working for UNIVERSITY under the Research
         Program shall be employees, agents or students of UNIVERSITY and shall
         not be employees of LEXIN.

                              ARTICLE XII - CONFIDENTIALITY
                              -----------------------------

             Except as is necessary for LEXIN to practice commercially under the
         rights granted herein, all proprietary information disclosed by either
         party to the other hereunder shall be received by the receiving party
         (including all appropriate employees, agents and independent
         contractors) in strictest confidence and used solely in furtherance of
         this Agreement, and shall be accorded the same degree of
         confidentiality and secrecy with which the receiving party holds its
         own most confidential information of a similar nature, but in no event
         less than reasonable care. Such confidential information, subject to
         the provisions of the Kansas Open Records Act, K.S.A. 45-201 et. seq.
                                                                      --  ---
         (Supp. 1987), shall not be disclosed to any persons other than: (i)
         employees or agents of the receiving party or independent contractors
         employed by the receiving party who have reasonable need for access to
         such information in connection with the receiving party's performance
         under this Agreement and who are bound to the receiving party by a
         written agreement of confidentiality containing terms consistent with
         those contained in this Agreement; and (ii) governmental authorities,
         as required, to obtain necessary regulatory clearances. Information
         shall not be deemed to be proprietary information and such restrictions
         shall not apply to any such information: (a) which is, or subsequently
         may become, within the knowledge of the general public, without the
         fault of the receiving party, (b) which is known to the receiving 
         party prior to the time of receipt thereof from the disclosing party, 
         as shown by competent written records, (c) which is proved to have 
         been developed by the receiving party independently and wholly 
         without resort to the proprietary information of the disclosing 
         party, as shown by competent written records; or (d) which is 
         subsequently rightfully obtained from sources other than the 
         disclosing party and without confidential restriction in favor of 
         the disclosing party.


                                        8
<PAGE>
                         ARTICLE XIII - ABATEMENT OF INFRINGEMENT
                         ----------------------------------------

             If at any time any third party shall infringe any unexpired patent
         licensed hereunder and LEXIN or UNIVERSITY shall give notice in writing
         to the other of the existence of such infringement, then LEXIN may at
         its election bring suit in its own name against such infringer. Should
         LEXIN bring suit in its own name, UNIVERSITY shall execute such legal
         papers necessary for the prosecution of such suit as may be requested
         by LEXIN, and LEXIN shall be liable for all costs and expenses of such
         litigation and shall be entitled to receive and retain all recoveries
         therefrom, subject to payment to UNIVERSITY of five percent (5%) of the
         amount by which such recovery exceeds LEXIN's out-of-pocket expenses
         for such litigation. Should LEXIN not institute suit within 120 days of
         notice of the infringement, UNIVERSITY shall have the right but not the
         obligation to bring suit in its own name against such infringer. Should
         UNIVERSITY bring suit in its own name, LEXIN shall execute such legal
         papers necessary for the prosecution of such suit as may be requested
         by UNIVERSITY, and UNIVERSITY shall be responsible for all costs and
         expenses of such litigation and shall be entitled to receive and retain
         all recoveries therefrom.

                                  ARTICLE XIV - NOTICES
                                  ---------------------

             Any notice required under this Agreement shall be considered given
         upon the earlier of: (i) when actually received at the address set
         forth below; or (ii) two business days after such notice, properly
         addressed and shipped overnight service, is sent by either party to the
         other. The proper addresses for notice are as follows:

                   if to UNIVERSITY:

                        Wichita State University
                        1845 N. Fairmount Avenue
                        Office of Research Administration 
                        Wichita, Kansas 67206
                        Attention: Harry Williford

                   if to LEXIN:

                        Lexin Pharmaceutical Corporation 
                        Pennsylvania Business Campus 
                        Rock Plaza III 
                        111 Rock Road
                        Horsham, Pennsylvania 19044-2310 
                        Attention: Jerry B. Hook, Ph.D.
                                   President and Chief 
                                    Executive Officer


                                     9
<PAGE>
                   with a copy to:

                        James A. Lebovitz, Esquire 
                        Ballard Spahr Andrews & Ingersoll 
                        1735 Market Street
                        Philadelphia, Pennsylvania 19103


                                ARTICLE XV - MISCELLANEOUS
                                --------------------------

             A.    This Agreement shall be governed by and construed in
         accordance with the internal laws of the State of Kansas. In the event
         of any dispute arising hereunder, UNIVERSITY agrees that personal
         jurisdiction and venue in any suit between LEXIN and UNIVERSITY shall
         be exclusively in either the United States District Court for the
         District of Kansas or the Court of Common Pleas of Sedgwick County,
         Kansas.

             B.    UNIVERSITY and LEXIN agree that each party to this Agreement
         is operating as an independent contractor and not as an agent of the
         other. This Agreement shall not constitute a partnership or joint
         venture, and neither party may be bound by the other to any contract,
         arrangement or understanding except as specifically stated herein.

             C.    This Agreement constitutes the entire agreement between the
         parties hereto with respect to the subject matter hereof and as such
         supersedes all previous written and oral negotiations, agreements,
         contracts, representations, letters of intent, understandings and
         commitments with respect thereto. This Agreement may be modified,
         discharged, amended, or extended only by a writing signed by a duly
         authorized representative of the parties.

             D. Neither LEXIN nor UNIVERSITY shall make any news release or
         other public statement, whether to the press, stockholders or
         otherwise, disclosing the terms of this Agreement or of any amendment
         hereto, or to performance hereunder or the existence of the arrangement
         between the parties shall be originated by either LEXIN or UNIVERSITY
         or their employees without the prior written approval of the other
         party except as required by law.

             E.    The provisions found in the Contractual Provisions Attachment
         (Form DA-146a), which is attached hereto as Appendix B and executed by
         the parties to this Agreement, are hereby incorporated in this contract
         and made a part hereof.


                                     10
<PAGE>
             IN WITNESS WHEREOF, and intending to be bound hereby, the parties
         have caused this Agreement to be signed by their duly authorized
         representatives,


         LEXIN PHARMACEUTICAL CORPORATION


         By:      /s/ Jerry B. Hook
                  ---------------------------------
         Name:    Jerry B. Hook
                  ---------------------------------
         Title:   President
                  ---------------------------------
         Date:    23 May 1994
                  ---------------------------------


         WICHITA STATE UNIVERSITY


         By:      /s/ Harry G. Williford
                  ---------------------------------
         Name:    Harry G. Williford
                  ---------------------------------
         Title:   Director, Research Administration
                  ---------------------------------
         Date:    5/27/94
                  ---------------------------------


         AGREED TO AND ACCEPTED BY: 

         WILLIAM C. GROUTAS, Ph. D.


         By:      /s/ William C. Groutas
                  ---------------------------------
         Name:    William C. Groutas
                  ---------------------------------
         Title:   Endowment Assn. Distinguished
                  ---------------------------------
                    Professor of Chemistry
                  ---------------------------------
         Date:    May 26, 1994    
                  ---------------------------------


                                   11
<PAGE>
                               APPENDIX A 


                            RESEARCH PROGRAM
                            ----------------


                                     12
<PAGE>
         Proposed Research
         ----------------- 

         [











                                                                      ]
<PAGE>
                               Financial Plan

             The project will require per year, beginning in 1994:  
             [


















                                                                      ]
<PAGE>
                                     Amendment No. 1
                    to Collaborative Research and Licensing Agreement

         This Amendment No 1 is made this 19th day of January, 1995 between
         Lexin Pharmaceutical Corporation, Pennsylvania Business Campus,
         Horsham, PA 19044-2310 ("Lexin") and Wichita State University, 1845 N.
         Fairmount Avenue, Wichita, Kansas 67206-0007 ("University").

                                         RECITALS

         A. Lexin and the University entered into a Collaborative Research and
         Licensing Agreement ("Agreement") dated April 1, 1994.

         B. The parties desire to extend the term of the Agreement for an
         additional one year term.

         NOW,  THEREFORE,  in consideration  of  the  promises  and  the  mutual
         covenants  contained herein,  and intending  to be  legally bound,  the
         parties hereto agree as follows:

         1. The term of this agreement is hereby extended to cover the 
            period [               ]

         2. Except as  expressly amended herein, all other  terms and conditions
         of the Agreement shall remain in full force and effect.

         IN WITNESS WHEREOF, the parties hereto have duly executed this
         Amendment No. 1 as of the date first above written.

                                            FOR WICHITA STATE 
                                            UNIVERSITY


                                            By:    /s/ Harry E. Williford
                                                   ----------------------------
                                            Name:  Harry E. Williford
                                                   ----------------------------
                                            Title: Director Research 
                                                     Administration
                                                   ----------------------------


                                            FOR LEXIN PHARMACEUTICAL 
                                            CORPORATION


                                            By:    /s/ Jerry B. Hook
                                                   ----------------------------
                                                   Jerry B. Hook, Ph.D.
                                                   President & C.E.O.
<PAGE>
State of Kansas                                Agency No.___ Contract No._____
Department of Administration
Division of Accounts and Reports
DA-1162 (Rev. 9-93)


                      CONTRACTUAL PROVISONS ATTACHMENT

Important:     This form contains mandatory contract provisions and must be
               attached to or incorporated in all copies of any contractual
               agreement.  If it is attached to the vendor/contractor's
               standard contract from, then that form must be altered to
               contain the following provision:

               "The provisions found in Contractual Provisions Attachment
               (form DA-146a), which is attached hereto, are hereby
               incorporated in this contract and made a part hereof".

The parties agree that the following provisions are hereby incorporated
into the contract to which it is attached and made a part thereof, said
contract being the ____day of ______________________, 19_____

1.   TERMS HEREIN CONTROLLING PROVISIONS
     -----------------------------------
     It is expressly agreed that the terms of each and every provision in
     this attachment shall prevail and control over the terms of any other
     conflicting provision in any other document relating to and a part of
     the contract in which this attachment is incorporated.

2.   AGREEMENT WITH KANSAS LAW
     -------------------------
     All contractual agreements shall be subject to, governed by, and
     construed according to the laws of State of Kansas.

3.   TERMINATION DUE TO LACK OF FUNDING APPROPRIATION
     ------------------------------------------------
     If, in the judgement of the Director of Accounts and Reports,
     Department of Administration, sufficient funds are not appropriated to
     continue the function performed in this agreement and for the payment
     of the charges hereunder, State may terminate this agreement at the
     end of its current fiscal year.  State agrees to give written notice
     of termination to contractor at least 30 days prior to the end of its
     current fiscal year, and shall give such notice for a greater period
     prior to the end of such fiscal year as may be provided in this
     contract, except that such notice shall not be required prior to 90
     days before the end of such fiscal year.  Contractor shall have the
     right, at the end of such fiscal year, to take possession of any
     equipment provided State under the contract.  State will pay to the
     contractor all regular contractual payments incurred through the end
     of such fiscal year, plus contractual charges incidental to the return
     of any such equipment.  Upon termination of the agreement by State,
     title to any such equipment shall revert to contractor at the end of
     State's current fiscal year.  Ther termination of the contract
     pursuant to this paragraph shall not cause any penalty to be charged
     to the agency or the contractor.

4.   DISCLAIMER OF LIABLILTY
     -----------------------
     Neither the State of Kansas nor any agency thereof shall hold harmless
     or indeminfy any contractor beyond that liability incurred under the
     Kansas Tort Claims Act (K.S.A. 75-6101 et seq.).
                                            -- ---

5.   ANTI-DISCRIMINATION CLAUSE
     --------------------------
     The contractor agrees: (a) to comply with Kansas Act Against
     Discrimination (K.S.A. 44-1001 et seq.) and the Kansas Age
                                    -- ---
     Discrimination in Employment Act (K.S.A 44-1111 et seq.) and the
                                                     -- ---
     applicable provisions of the Americans with Disabilities Act (42
     U.S.C. 12101 et seq.) (ADA) and to not discriminate against any person
                  -- ---
     because of race, religion, color, sex, disability, national origin or
     ancestry, or age in the admission or access to, or treatment or
     employment in, its programs or activities; (b) to include in all
     solicitations or advertisements for employees, the phrase "equal
     opportunity employer"; (c) to comply with the reporting requirements
     set out at K.S.A. 44-1031 and K.S.A. 44-1116; (d) to include those
     provisions in every subcontract or purchase order so that they are
     binding upon such subcontractor or vendor; (e) that a fialure to
     comply with the reporting requirements of (c) above or if the
     contractor is found guilty of any violation of such acts by the Kansas
     Human Rights Commission, such violation shall constitute a breach of
     contract and the contract may be canceled, terminated or suspended, in
     whole or in part, by the contracting state agency or the Kansas
     Department of Administration; (f) if it is determined that the
     contractor has violated applicable provisions of the ADA, such
     violation shall constitute a breach of contract and the contract may
     be canceled, terminated or suspended, in whole or in part, by the
     contracting state agency or the Kansas Department of Administration.

     Parties to this contract understand that the provisions of this
     paragraph number 5 (with the exception of those provisions relating to
     the ADA) are not applicable to a contractor who employs fewer than
     four employees during the term of such contract or whose contracts
     with the contracting state agency cumulatively total $5,000 or less
     during the fiscal year of such agency.

6.   ACCEPTANCE OF CONTRACT
     ----------------------
     This contract shall not be considered accepted, approved or otherwise
     effective until the statutorily required approvals and certifications
     have been given.

7.   ARBITRATION, DAMAGES, WARRANTIES
     --------------------------------
     Notwithstanding any language to the contrary, no interpretation shall
     be allowed to find the State or any agency thereof has agreed to
     binding arbitration, or the payment of damages or penalties upon the
     occurrence of a contingency.  Further, the State of Kansas shall not
     agree to pay attorney fees and late payment charges beyond those
     available under the Kansas Prompt Payment Act (K.S.A. 75-6403), and no
     provision will be given effect which attempts to exclude, modify,
     disclaim or otherwise attempt to limit implied warranties of
     merchantability and fitness for a particular purpose.

8.   REPRESENTATIVE'S AUTHORITY TO CONTRACT
     --------------------------------------
     By signing this document, the representative of the contractor thereby
     represents that such person is duly authorized by the contractor to
     execute this document on behalf of the contractor and that the
     contractor agrees to be bound by the provisions thereof.

9.   RESPONSIBILITY FOR TAXES
     ------------------------
     The State of Kansas shall not be responsible for, nor indemnify a
     contractor for, any federal, state or local taxes which may be imposed
     or levied upon the subject matter of this contract.

10.  INSURANCE
     ---------
     The State of Kansas shall not be required to purchase any insurance
     against loss or damage to any personal property to which this contract
     relates, nor shall this contract require the State to establish a
     "self-insurance" fund to protect against any such loss or damage. 
     Subject to the provisions of the Kansas Tort Claims Act (K.S.A. 75-
     6101 et seq.), the vendor or lessor shall bear the risk of any loss or
          -- ---
     damage to any personal property in which vendor or lessor holds title.

11.  INFORMATION
     -----------
     No provisions of this contract shall be construed as limiting the
     Legislative Division of Post Audit from having access to information
     pursuant


                                                               Exhibit 10.72A


SPARTA PHARMACEUTICALS, INC. HAS OMITTED FROM THIS EXHIBIT 10.72A PORTIONS OF
THE AGREEMENT FOR WHICH SPARTA PHARMACEUTICALS, INC. HAS REQUESTED CONFIDENTIAL
TREATMENT FROM THE SECURITIES AND EXCHANGE COMMISSION. THE PORTIONS OF THE 
AGREEMENT FOR WHICH CONFIDENTIAL TREATMENT HAS BEEN REQUESTED ARE MARKED 
"[   ]" AND SUCH CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH THE 
SECURITIES AND EXCHANGE COMMISSION.



                                LICENSE AGREEMENT


                                     between


                             PI RESEARCH CORPORATION 

                                     and the


                      TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA 


                                        for


                                ALPHA ANTICHYMOTRYPSIN 


                                         and


                                  C1 ESTERASE INHIBITOR


                                     JANUARY 2, 1992
<PAGE>
               License between PI Research Corporation and the Trustees of
                              the University of Pennsylvania

                                         Contents

         License Agreement for Alpha-1 Antichymotrypsin
                                      and C1 Esterase Inhibitor

         Attachment A:   Protatek Cooperative Research Agreement
                               of 10/1/87 ("Protatek CRA")

         Attachment B:   Protatek Alpha-1 Antichymotrypsin License

         Attachment C:   Protatek C1 Esterase License Agreement

         Attachment D:   Protatek-PIRC-Penn Assignment Agreement
                                   of 9/6/91

         Attachment E:   PIRC/Penn Stock Purchase Agreement; PIRC
                                    Charter and By-Laws

         Attachment F:   PIRC/Penn Collaborative Research Agreement
                                    of 3/1/91

                         Attachment 1:  Scope of Work and
                                              Schedule of Payments
                         Attachment 2:  Additional Provisions
                                              for License Agreement
                         Attachment 3:  Confidentiality Agreement

         Attachment G:   Rubin Stock Agreement

         Attachment H:   Rubin Consultancy Agreement

         Attachment I:   Cooperman Stock Agreement

         Attachment J:   Cooperman Consultancy Agreement

         Attachment K:   Schechter Stock Agreement

         Attachment L:   Schechter Consultancy Agreement

         Attachment M:   Mei-Wang Stock Agreement

         Attachment N:   Mei-Wang Consultancy Agreement

         Attachment O:   Letter Agreement among Investigators and
                                      University
<PAGE>
                                                               Signature Version

                                  License Agreement for
                               Alpha-1 Antichymotrypsin and
                                  C1 Esterase Inhibitor

             This LICENSE AGREEMENT is made as of the Second day of January,
         1992 by and between THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIA, a
         nonprofit corporation organized and existing under the laws of the
         Commonwealth of Pennsylvania (the "University"), PI Research
         Corporation, a corporation organized and existing under the laws of
         Delaware ("Licensee" or "Company").

                                     R E C I T A L S

             A. On October 1, 1987 Protatek International, Inc. ("Protatek"), a
         company then based in Minneapolis, MN entered a cooperative research
         agreement with the University for the development of human protease
         inhibitors. This Agreement is appended as Attachment A and is referred
         to as "Protatek CRA."

             B. Dr. Harvey Rubin, an assistant professor of medicine at the
         University, was the principal investigator under the Protatek CRA and
         has assigned all rights, title and interest in and to the Licensed
         Technology (as defined below) to the University.

             C. On September 27, 1988, Protatek, which had moved to St. Paul, MN
         in the  intervening  period, entered  two License  Agreements with  the
         University.  One  of  these  agreements  was  for  the  human  protease
         inhibitor, alpha-1 Antichymotrypsin (Attachment B). The second of these
         agreements was for the human  protease inhibitor, C1 Esterase Inhibitor
         (Attachment C).

             D. Protatek has offered, and the Company has accepted, an agreement
         ("Attachment D"), dated September 6, 1991, under which certain rights
         held by Protatek virtue of the cooperative research and license
         agreements in Attachments A, B, and C were assigned by Protatek to
         Licensee in exchange for considerations to Protatek and University as
         described in Attachment D and Stock Purchase Agreement
         (Attachment E).

             E. Company has undertaken and fulfilled the obligations of Protatek
         to University under the cooperative research agreement in Attachment A,
         which has terminated. Company and
<PAGE>
         License Agreement between PI Research Corporation and Penn            2
         January 2, 1992

         University desire to continue cooperative research under a new
         Collaborative Research Agreement with the University, dated March 1,
         1991 ("Collaborative Research Agreement"), and appended as Attachment
         F.

             F. In order to clarify, update and expand the terms of the license
         arrangements set forth in Attachments B and C, Company and University
         hereby agree that this License Agreement ("Agreement") is in
         substitution for and replaces the license agreements in Attachments B
         and C, which agreements the parties agree shall be automatically
         terminated upon execution of this Agreement.

         NOW, THEREFORE, in consideration of the premises and mutual covenants
         contained herein, and intending to be legally bound hereby, the parties
         hereto agree as follows:

                               ARTICLE 1: DEFINITIONS

         1.1          Definitions. This Agreement has several defined
                      -----------
         terms in common with the Collaborative Research Agreement. The
         following terms as set forth herein shall have the following meaning:

         1.2          "Affiliate" means, when used with reference to Licensee,
                      ----------
         any person directly or indirectly controlling, controlled by or under
         common control with Licensee. For purposes of this Agreement, "control"
         means the direct or indirect ownership of over 50% of the outstanding
         voting securities of an entity, or the right to receive over 50% of the
         profits or earnings of a person, or the right to control the policy
         decisions of a person.

         1.3          "Bankruptcy Event" means the person in question becomes
                       ----------------
         insolvent, or voluntary or involuntary proceedings by or against such
         person are instituted in bankruptcy or under such insolvency law, or a
         receiver or custodian is appointed for such person, or proceedings are
         instituted by or against such person for corporate reorganization or
         the dissolution of such person, which proceedings, if voluntary, shall
         not have been dismissed within sixty (60) days after the date of
         filing, or such person makes an assignment for the benefit of
         creditors, or substantially all of the assets of such person are seized
         or attached and not released within sixty (60) days thereafter.

         1.4          "Calendar Quarter" means each three-month period, or any
                       ----------------
         portion thereof, beginning on January 1, April 1, July 1 and October 1.

         1.5          "Confidential Information" means (i) the Technical
                       ------------------------
         Information, (ii) any other information or material in tangible form
         that is marked as confidential or proprietary by the furnishing party
         at the time it is delivered to the receiving party, and (iii)
         information that is furnished
<PAGE>
         License Agreement between PI Research Corporation and Penn          3 
         January 2, 1992

         orally if the furnishing party identifies such information as
         confidential or proprietary when it is disclosed and confirms such
         designation in writing within 30 days after such disclosure.

         1.6         "Drug" means (i) an article intended for use in the
                      ----
         diagnosis, cure, mitigation, treatment, or prevention of disease in man
         or other animals; or (ii) an article intended to affect the structure
         of any function of the body of man or other animals that requires FDA
         approval as a drug.

         1.7          "Effective Date" means the first date when the University
                       --------------
         and Licensee have executed this Agreement.

         1.8          "Federal Government Interest" means the rights, if
                       ---------------------------
         applicable, of the United States Government under Public Laws 96-517,
         97-256 and 98-620, codified at 35 U.S.C. Paragraphs 200-212, and any
         regulations issued thereunder, as such statute or regulations may be
         amended from time to time hereafter.

         1.9          "Field" means Technical Information, technology and know-
                       -----
         how relating to the protease inhibitors alpha-1 Antichymotrypsin and C-
         1 Esterase Inhibitor, and improvements related thereto developed by Dr.
         Harvey Rubin and/or any other Investigator, or University laboratory
         personnel during the performance of the Collaborative Research
         Agreement.

         1.10        "Joint Patented Product" means anything which is made, made
                      ----------------------
         for, used or sold, which manufacture, use or sale is covered by any
         Valid Claim of a Joint Patent in any country.

         1.11        "Joint Patents" means patents and patent applications
                     ---------------
         together with any and all patents issuing thereupon, continuation,
         divisional, and re-issue applications thereof and continuation-in-part
         applications thereof claiming inventions within the Field and any
         United States or foreign patents granted upon such applications based
         upon inventions and improvements discovered or made by Principal
         Investigator and/or any other Investigator jointly with one or more
         inventors of Licensee, within the Field during the term of this
         Agreement or the Collaborative Research Agreement.

         1.12        "Licensed Patents" means United States Patent Applications,
                     ------------------
         Serial Numbers 370,704, "Alpha-1 Antichymotrypsin Analogues and Methods
         of Production and any patent applications filed by the University on C1
         Esterase Inhibitors, and related foreign patents and patent
         applications, if any, together with any and all patents issuing
         thereupon, including continuation, divisional and re-issue application
         and continuation-in-part applications
<PAGE>
         License Agreement between PI Research Corporation and Penn            4
         January 2, 1992

         thereof claiming inventions within the Field, and any United States or
         foreign patents granted upon such applications based upon inventions
         and improvements discovered by University through Dr. Harvey Rubin
         and/or any other Investigator or University laboratory personnel within
         the Field during the term of this Agreement or as a result of
         performance of the Work Scope set forth in the Collaborative Research
         Agreement between the parties.

         1.13        "Licensed Product(s)" means and includes all products the
                     ---------------------
         manufacture, composition, use, sale or other disposition of which (i)
         is subject to one or more Valid Claims of a Licensed Patent or (ii) is
         subject to one or more Valid Claims of a Joint Patent.

         1.14        "Licensed Technology" means the Licensed Patents and the
                     ---------------------
         Technical Information.

         1.15         "Net Sales Price" means the gross amount charged by
                      -----------------
         Licensee for the sale of a Licensed Product, net of returns and credits
         for rejected goods, and after deducting (i) trade, quantity and cash
         discounts actually allowed, (ii) sales, use or other similar taxes, 
         the legal incidence of which is on Licensee, and (iii) freight 
         allowances, packing charges, insurance and customs duties, to the 
         extent any of the foregoing are identified on the invoice for the 
         Licensed Product, and (iv) uncollectible receivables which are past 
         due 120 days or more. If a Licensed Product is sold for consideration 
         other than solely cash, the fair market value of such other 
         consideration shall be included in the Net Sales Price.

         1.16          "Person" or "person" means any corporation, partnership,
                       --------    --------
         joint venture or natural person.

         1.17        "Principal Investigator" or "Investigators" refers
                     ------------------------    ---------------
         respectively to the Principal Investigator Harvey Rubin, M.D., Ph.D.,
         Assistant Professor of Medicine at University, and to Investigators
         Barry S. Cooperman, Ph.D., Professor of Chemistry, Norman Schechter,
         Ph.D., Research Professor of Dermatology and Zai-Mei Wang, Ph.D.,
         Research Associate Infectious Diseases, all at University.

         1.18         "Sale," "sale" or any variation thereof means the sale,
                      --------------
         assignment, lease or other disposition of a Licensed Product by
         Licensee to a non-Affiliate. A Licensed Product shall be deemed to have
         been sold for purposes of calculating royalties under Article III
         hereof upon the first to occur of the following: (i) the transfer of
         title in the Licensed Product from Licensee to a non-Affiliate; or (ii)
         shipment of the Licensed Product from the manufacturing facilities of
         Licensee to a non-Affiliate.
<PAGE>
         License Agreement between PI Research Corporation and Penn            5
         January 2, 1992

         1.19        "Technical Information" means and includes all technical
                     -----------------------
         information, trade secrets, developments, formulae, processes and other
         information developed by Dr. Harvey Rubin and/or other Principal
         Investigator that the University owns or possesses and that relates to
         the use of alpha-1 Antichymotrypsin and/or C1 Esterase Inhibitor in the
         Field, including by way of illustration and not limitation, designs,
         data, drawings, documents, models, and other similar information.
         "Technical Information" shall exclude any of the foregoing that are
         included in a claim of the Licensed Patents.

         1.20        "Valid Claim" means a claim of an unexpired Licensed Patent
                     -------------
         that has not been withdrawn, cancelled or disclaimed or held invalid by
         a court or governmental authority of competent jurisdiction in an
         unappealed or unappealable decision, or a claim of a pending patent
         application.

                               Article II: Grant of License

         2.1         Licensed Technology Grant. University grants to Licensee
                     --------------------------
         for the term of this Agreement an exclusive license, with right to
         sublicense, to make, use, have made or sell Licensed Products and
         products incorporating Technical Information throughout the world,
         subject to the terms and conditions herein.

         2.2         Exclusive but for Non-Profit Use. The license grant of this
                     ---------------------------------
         Article is exclusive but for the reserved right of the University to
         use and permit the use of by non-profit organizations, without cost and
         in confidence, the Licensed Patents, the Joint Patent Rights, and the
         Technical Information solely for educational and research purposes on a
         non-commercial basis, subject to the prior written consent of Licensee
         for each such use, such consent not to be unreasonably withheld.

         2.3         Right to Sublicense. The right to sublicense conferred upon
                     --------------------
         Licensee under this Agreement is subject to the following conditions:

             (a)  Licensee  shall  forward  to  the  University,  promptly  upon
         execution,  a complete  and accurate  written copy  of each  sublicense
         granted hereunder.

             (b) In each sublicense, the sublicensee shall be prohibited from
         further sublicensing and shall acknowledge that it is subject to the
         terms and conditions of the License granted to Licensee under this
         Agreement.

             (c) Notwithstanding any such sublicense, Licensee shall remain
         primarily liable to the University for all of the Licensee's duties and
         obligations contained in this
<PAGE>
         License Agreement between PI Research Corporation and Penn            6
         January 2, 1992

         Agreement, and any act or omission of a sublicensee which would be a
         breach of this Agreement if performed by Licensee shall be deemed to be
         a breach by Licensee of this Agreement.

             (d) If Licensee becomes subject to a Bankruptcy Event, all payments
         then or thereafter due and owing to Licensee from its sublicensees
         shall upon notice from the University to any such sublicensee become
         payable directly to the University for the account of the Licensee;
         provided however, that the University shall remit to Licensee the
         amount by which such payments exceed the amounts owed by licensee to
         the University.

         2.4          No Riqhts by Implication. No rights or licenses with
                      -------------------------
         respect to the Licensed Technology are granted or deemed granted
         hereunder or in connection herewith, other than those rights or
         licenses expressly granted in this Agreement.

         2.5          Federal Government Interest. Licensee acknowledges that in
                      ----------------------------
         accordance with the Federal Government Interest, the United States
         Government retains certain rights in inventions funded in whole or in
         part under any contract, grant or similar agreement with a Federal
         agency. The license to the Licensed Technology granted under this
         Article II is expressly subject to all such rights.

                                  Article III: Royalties

         3.1         License Fee. In consideration of the Assignment Agreement
                     ------------
         in Attachment D, Licensee has issued, on the Effective Date of this
         Agreement, common shares in the Licensee to the following parties:

             (a) To University a grant of [     ] shares subject to the terms
         and conditions described in Attachment E ("University Stock Purchase
         Agreement"), such shares constituting an [                ] fully 
         diluted interest in the Licensee at the Effective Date of this 
         Agreement;

                    (b) To Dr. Harvey Rubin an opportunity to
         purchase [            ] subject to the terms and conditions
         as described in Attachment G ("Rubin Stock Agreement) and Attachment H
         ("Rubin Consultancy Agreement"), such shares
         constituting a [                     ] fully diluted interest in
         the Licensee at the Effective Date of  this Agreement;

             (c) To Dr. Barry Cooperman, University Professor of Chemistry and
         Investigator, an opportunity to purchase
         [     ] shares subject  to the terms and conditions described in 
         Attachment I ("Cooperman Stock Agreement") and Attachment
<PAGE>
         License Agreement between PI Research Corporation and Penn           7
         January 2, 1992

         J ("Cooperman Consultancy Agreement"), such shares constituting a      
         [                    ] fully diluted interest in the Licensee as of 
         the Effective Date of this Agreement;

             (d) To Dr. Norman Schechter, University Research Professor of
         Dermatology and Investigator, an opportunity to
         purchase [      ] shares subject to the terms and conditions
         described in Attachment K ("Schechter Stock Agreement") and
         Attachment L ("Schechter Consultantancy Agreement") such
         shares constituting a [                                ] fully
         diluted  interest in  the Licensee  as  of the  Effective Date  of this
         Agreement;

             (e) To Dr. Zhai-Mei Wang, University Research Associate for
         Infectious Disease and Investigator an
         opportunity to purchase [      ] shares subject to the terms
         and conditions described in Attachment M ("Wang Stock
         Agreement") and Attachment N ("Wang Consultancy Agreement"), such
         shares constituting a [                    ] fully diluted interest 
         in the Licensee as of the Effective Date of this Agreement;

             (f) The provisions of this paragraph 3.1 are further accepted by
         the Investigators in the letter agreement appearing in Attachment O.

             (g) No additional up-front payment or fee upon execution of this
         Agreement is due to the University by Licensee.

         3.2         Royalties. In consideration of the exclusive Licensed
                     ---------
         Technology grant herein, Licensee shall pay royalties to the University
         on the following basis:

             (a) Licensee shall pay to University a royalty of [               ]
         of the Net Sales Price of each Licensed Product sold by Licensee, 
         and, subject to Section 3.11, such royalty rate shall not be subject 
         to reduction by Licensee if Licensee must acquire, for any reason, 
         patent rights from third parties in order to practice Licensed 
         Technology or sell Licensed Products.

             (b) Licensee shall be exempt from the payment of royalties for sale
         of products that incorporate Technical Information, provided such
         products do not incorporate Licensed Patents. Royalty free sales of
         such products incorporating only Technical Information shall not apply
         if Licensee, University, Principal Investigators and Investigators
         agree in writing that Technical Information disclosed by University to
         Licensee, which is otherwise patentable, shall be maintained as a trade
         secret. In such
             
<PAGE>
         License Agreement between PI Research Corporation and Penn           8
         January 2, 1992

         case a product incorporating such trade secret shall bear
         the royal described in Section 3.2 herein for the lesser
         of [              ] years following first commercial sale of
         such product(s), or for as long as such Technical Information is
         maintained as a trade secret.

             (c) Licensee shall pay to the University the lesser of 
         [            ] of all royalties, license fees, advances and other
         payments (however characterized) received by Licensee pursuant to a
         sublicense of any rights granted Licensee hereunder, or [            ]
         of such sublicensee's Net Sales for such Licensed Products sold by
         such sublicenses. Any noncash consideration received by the Licensee
         from sublicensees in lieu of a license fee or on account of sales of
         Licensed Product shall be valued at its fair market value as of the
         date of receipt. Monies paid to Licensee exclusively to fund research
         and development or clinical testing are not subject to any royalty to
         the University.

             (d) Sales of any Licensed Product shall not be subject to more than
         one assessment of the [                 ]  royalty due University, 
         regardless of the number of Licensed Patents or Joint Patents, or 
         uses of Technical Information treated as trade secret, that are 
         applicable to such Licensed Product.

          3.3       Diligence Obligations of Licensee
                    ---------------------------------

             (a) In lieu of diligence fees paid to the University, Licensee
         agrees to fund, until such time as minimum royalties are due under
         Section 3.4 hereunder, development of Licensed Technologies in annual
         amounts substantially similar to the annual budgeted amount of the
         Collaborative Research Agreement. Such development work may
         be funded at the University, in the facilities of the
         Licensee, in the facilities of a sublicensee, or in other venue
         reasonably capable of conducting such development. Licensee may
         employ its own capital, or governmental or commercial contract
         revenues in fulfillment of this obligation. Funds expended by a
         sublicensee, and appropriately documented and reported, shall also
         be applicable to this obligation of Licensee.

             (b) In order to fulfill its obligations under 3.3(a) herein through
         February 29, 1992, Licenses shall support research at the University
         under the terms of the Collaborative Research Agreement and in such
         amounts as described in the budget of the Collaborative Research
         Agreement.

         3.4          Minimum Royalties. Licensee shall pay to Licensor as a
                      -----------------
         nonrefundable advance against royalties during the ensuing year,
         minimum annual royalties on the following
<PAGE>
         License Agreement between PI Research Corporation and Penn            9
         January 2, 1992

         dates in the corresponding amounts (the "Minimum Royalties"):

                    Minimum Royalty           Fiscal Year Beginning
                    $ [        ]              July 1, 1997
                                                        --
                    $ [        ]              July 1, 1998
                                                        --
                    $ [        ]              July 1, 1999
                                                        --
                    $ [        ]              July 1 of each fiscal 
                                                   year thereafter


         Minimum royalties shall be available for full credit against Royalties
         due under Section 3.2 during the year in which such Minimum Royalties
         are paid and during subsequent years until the amount of the credit is
         fully used. In any year that a minimum royalty is due, if the Licensee
         sponsors research at the University in the Field under the Principal
         Investigator during that year, the full amount of research funding paid
         may be applied as a credit against minimum royalties due in that year
         and in subsequent years until the full amount of credit is fully used.

         3.5          Sales to Federal Government. To the extent required by the
                      ---------------------------
         Federal Government Interest,  sales by  Licensee to  the United  States
         Government shall not be subject to royalty.

         3.6         Payments. Royalties payable under Section 3.2 hereof shall
                     --------
         be paid within (30) days following the last day of the Calendar Quarter
         in which the royalties accrue. After termination of this Agreement, the
         final royalty payment shall be made in accordance with the provisions
         of Article 9.4 hereof. Payments may be deemed paid as of the day on
         which they are received at the account designated pursuant to Article
         3.8.

         3.7         Reports. Licensee shall deliver to the University within
                     -------
         thirty (30) days after the end of each Calendar Quarter a report,
         certified by the chief financial officer of Licensee, setting forth in
         reasonable detail the calculation of the royalties payable to the
         University for such Calendar Quarter, including, without limitation,
         the Licensed Product sold in each country during such Calendar Quarter,
         the Net Sales Price thereof, all compensation received from
         sublicensees, and the amount of Minimum Royalties available for credit
         for the corresponding Calendar Quarter.

         3.8        Currency, Place of Payment, Interest.
                    ------------------------------------

             (a) All dollar amounts referred to in this Agreement are expressed
         in United States dollars. All payments to the University under this
         Agreement shall be made in United States dollars (or other legal
         currency of the United States) by check payable to "The Trustees of the
         University of Pennsylvania."
<PAGE>
         License Agreement between PI Research  Corporation and Penn          10
         January  2, 1992

             (b) If Licensee receives revenues from sales of Licensed Products
         in a currency other than United States dollars, royalties shall be
         converted into United States dollars at the conversion rate for the
         foreign currency as published in the Eastern edition of The Wall Street
                                                                 ---------------
         Journal as of the last date of the Calendar Quarter. If at any time
         --------
         legal restrictions prevent the prompt remittance of part or all
         royalties by Licensee or any sublicensee with respect to any country
         where a Licensed Product is sold, Licensee or such sublicensee shall
         have the right and option to make such payments by depositing the
         amount thereof in local currency to the University's account in a bank
         or other depository in such country; provided, however, that if such
         legal restrictions are not removed within one (1) year after the date
         such account is established, Licensee shall then remit promptly to the
         University an amount in United States dollars equal to the deferred
         royalties held in such account. Upon receipt of these deferred
         royalties by the University, Licensee shall be entitled to transfer to
         its own account all corresponding amounts held on behalf of the
         University in the local bank or depository.

             (c) Amounts that are not paid when due shall accrue interest from
         the due date until paid, at a rate equal to then prevailing prime rate
         of interest plus [                   ].  The University may treat 
         unpaid payments as a breach of this  Agreement notwithstanding the 
         payment of interest.

         3.9         Records. Licensee will maintain and cause its sublicensees
                     -------
         to maintain, complete and accurate books and record which enable the
         royalties payable hereunder to be verified. The records for each
         Calendar Quarter shall be maintained for five years after the
         submission of each report under Section 3.7 hereof. Upon reasonable
         prior notice to Licensee, the University and its accountants shall
         have access to the books and records of Licensee and its sublicensees
         to conduct a review or audit thereof. Such access shall be available
         not more than once each calendar year, during normal business hours,
         and for three years after the expiration or termination of this
         Agreement. If the University determines that Licensee has underpaid
         royalties by 10% or more, Licensee will pay the costs and expenses of
         the University's accountant in connection with its review or audit.

         3.10        Duration of Royalty Obligations. Except as described in
                     -------------------------------
         Section 3.2(b) herein, Licensee's royalty obligations for a Licensed
         Product shall terminate on a [


                                                                              ]
<PAGE>
         Licenee Agreement between PI Research Corporation and Penn           11
         January 2, 1992

         [
                                                                    ]
         
         3.11        Mandatory Licensing.       In the event that Licensee is
                     -------------------
         required by judgment, final order, or agreement with a third party to
         settle litigation, to acquire one or mere royalty-bearing licenses from
         a third party in order to fully exercise in a given country the rights
         granted by the University hereunder, then Licensee shall be entitled to
         credit an amount equal to [                  ] of the royalties 
         actually paid to such a third party against royalties  payable to the
         University  under  Section 3.2  hereof for Licensed Products  sold in 
         that country, provided however that for any calendar quarter such 
         credits do not exceed [                       ] of the royalties 
         payable to the University in such calendar quarter.

         3.12        Cumulative Credits. Under no circumstances shall Licensee
                     ------------------
         be entitled to receive credits against royalties payable to the
         University under Section 3.2 hereof that, for any Calendar Quarter,
         exceed in the aggregate [                          ]  of the 
         royalties payable to the University under that section in such 
         calendar quarter. This provision does not apply to credits under 
         Sections 3.4 and 7.2(e but otherwise applies to any credit Licensee 
         may receive without limitation, under Sections 3.11, 6.3 or 7.1(d) 
         hereof.

         3.13       Unlicensed Sales by Third Parties. In the event that the
                    ---------------------------------
         total sales of any Licensed Product in any country by unlicensed third
         parties, based on bona fide information reporting such revenue by an
         unlicensed third party, equals or exceeds [                     ] of 
         the total revenue of          Licensee, its Affiliates and its 
         sublicensees for sale of such Licensed Product in said country, 
         then the royalty rate provided in Section 3.2 hereof for such 
         Licensed Product in such country shall be reduced to [             ]
         such royalty rate for Calendar Quarters so affected. This provision
         shall have no effect if Licensee fails to use reasonable efforts to
         terminate such unlicensed sales.

                     Article IV: Certain Obligations of the Licensee

          4.1       Licensee Efforts; Reporting.
                    ---------------------------
                    (a) Licensee shall use its best efforts to develop
         for commercial use and to market Licensed Products as soon as
         practicable, consistent with sound and reasonable business practices.
         In this connection, the parties acknowledge that the Licensed
         Technology has only recently been invented and that substantial
         additional effort, expense and time, as well as regulatory approval,
         will be required before manufacture and sales of any Licensed Product
         will be possible.
<PAGE>
         License Agreement between PI Research Corporation and Penn          12
         January 2, 1992

             (b) Licensee shall provide the University on each June 1 and
         December 1 with written reports, setting forth in such detail as the
         University may reasonably request, the progress of the development,
         evaluation, testing and commercialization of the Licensed Products.
         Licensee also shall notify the University within thirty (30) days after
         the first commercial sale of a Licensed Product.

         4.2        Compliance with Laws.
                    --------------------
                    (a) Licensee shall comply with all prevailing
         laws, rules and regulations pertaining to the development, testing,
         manufacture, marketing and import or export of the Licensed Products.
         Without limiting the foregoing, Licensee acknowledges that the transfer
         of certain commodities and technical data is subject to United States
         laws controlling the export of such commodities and technical data,
         including all Export Administration Regulations of the United States
         Department of Commerce. These laws and regulations, among other things,
         prohibit or require a license for the export of certain types of data
         to specified countries. Licensee will comply with all United States
         laws and regulations controlling the export of commodities and
         technical data, and will be solely responsible for any violation
         thereof by License~e of its sublicensees.

             (b) To the extent required by the Federal Government Interest, all
         Licensed Products to be used or sold in the United States shall be
         manufactured substantially in the United States, and Licensee shall
         take such actions necessary to assure that it and its sublicensees
         comply with the obligations imposed by this Section 4.2(b).

         4.3         Government Approvals. Licensee will be responsible for
                     --------------------
         obtaining at its cost and expense, all governmental approval required
         to commercially market the Licensed Products.

         4.4         Patent Notices, etc. Licensee shall mark the Licensed
                     -------------------
         Products sold in the United States with all applicable patent numbers.
         All Licensed Products shipped to and sold/or sold in other countries
         shall be marked and labeled in such a manner as to conform with all
         applicable laws of the country where the Licensed Products are sold.

         4.5         Security Interest. In consideration of the license and
                     -----------------
         other rights granted in this Agreement, Licensee hereby grants to the
         University a security interest in any interest Licensee may have in the
         Licensed Technology to secure performance of Licensee's obligations
         under this Agreement. Upon default by Licensee or if Licensee becomes
         subject to a Bankruptcy Event, the University shall have all the rights
         and remedies of a secured party under the Uniform Commercial Code.
         Licensee shall execute any such instruments
<PAGE>
         License Agreement between PI Research Corporation and Penn          13
         January 2, 1992

         or documents as shall be required to evidence and perfect such security
         interest in any jurisdiction.

                        Article V: Warranties and Representations

         5.1          Representations and Warranties of the University. The
                      ------------------------------------------------
         University represents and warrants to the Licensee that: (a) this
         Agreement, when executed and delivered by the University, will be the
         legal, valid and binding obligation of the University, enforceable
         against the University in accordance with its terms; (b) the University
         has not granted rights in or to the Licensed Technology to any person
         other than the Licensee, except to the extent provided by Federal
         Government Interest; (c) the University does not have any knowledge
         that the Licensed Technology infringes the proprietary rights of any
         third party; and (d) the University does not have any knowledge of any
         patent or other proprietary technology of the University other than the
         Licensed Patents and the Technical Information which would be required
         to make, have made, use and sell the Licensed Products and to practice
         under the Licensed Technology in connection therewith. However, the
         University gives no representation or warranty that any patent within
         the Licensed Patents will be granted or, if granted, that any such
         patent will be valid. The representations and warranties in clauses
         (b), (c), and (d) hereof are to the knowledge of the University, based
         upon conversations with certain officials of the University. The
         University has made no independent investigation, examination or review
         of the matters which are subject to the foregoing representations.

         5.2             Representations and Warranties of Licensee.  
                         ------------------------------------------
         Licensee represents and warrants to the University as follows:

             (a) Licensee is a corporation duly organized, validly existing and
         in good standing under the laws of Delaware, and has all requisite
         corporate power and authority to execute, deliver and perform this
         Agreement;

             (b) this Agreement, when executed and delivered by Licensee, will
         be the legal, valid and binding obligation of Licensee, enforceable
         against Licensee in accordance with its terms; and,

             (c) the execution, delivery and performance of this Agreement by
         Licensee does not conflict with, or constitute a breach or default
         under, (i) the charter documents of Licensee, (ii) any law, order,
         judgment or governmental rule or regulation applicable to Licensee, or
         (iii) any provision of any material agreement, contract, commitment or
         instrument to which Licensee is a party; and the execution, delivery
         and performance of this Agreement by Licensee does not require the
         consent, approval or
<PAGE>
         License Agreement between PI Research Corporation and Penn         14
         January 2, 1992

         authorization of, or notice, declaration, filing or registration with,
         any governmental or regulatory authority.

                  Article VI:Limitation on Liability and Indemnification

         6.1          No Warranties; Limitation on Liability. EXCEPT AS
                      --------------------------------------
         EXPLICITLY SET FORTH IN SECTION 5.1 HEREOF, THE LICENSED TECHNOLOGY IS
         PROVIDED ON AN "AS IS" BASIS AND THE UNIVERSITY MAKES NO
         REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO THE
         LICENSED TECHNOLOGY OR THE LICENSED PRODUCTS. BY WAY OF EXAMPLE BUT NOT
         OF LIMITATION, THE UNIVERSITY MAKES NO REPRESENTATIONS OR WARRANTIES
         (i) OF COMMERCIAL UTILITY, (ii) OF MERCHANTABILITY OR FITNESS FOR A
         PARTICULAR PURPOSE, OR (iii) THAT THE USE OF THE LICENSED TECHNOLOGY
         WILL NOT INFRINGE ANY PATENT, COPYRIGHT OR TRADEMARK OR OTHER
         PROPRIETARY RIGHT OR PROPERTY RIGHTS OF OTHERS. THE UNIVERSITY SHALL
         NOT BE LIABLE TO LICENSEE, LICENSEE'S SUCCESSORS OR ASSIGNS OR ANY
         THIRD PARTY WITH RESPECT TO ANY CLAIM ON ACCOUNT OF, OR ARISING FROM,
         THE USE OF INFORMATION IN CONNECTION WITH THE LICENSED TECHNOLOGY
         SUPPLIED HEREUNDER OR THE MANUFACTURE, USE OR SALE OF LICENSED PRODUCTS
         OR ANY OTHER MATERIAL DERIVED THEREFROM. THE UNIVERSITY SHALL NOT BE
         LIABLE TO LICENSEE OR ANY OTHER PERSON FOR ANY LOSS OF PROFITS, LOSS OF
         BUSINESS OR INTERRUPTION OF BUSINESS, OR FROM ANY INDIRECT, SPECIAL OR
         CONSEQUENTIAL DAMAGES OF ANY KIND INCURRED BY LICENSEE OR ANY OTHER
         PERSON WHETHER UNDER THIS AGREEMENT OR OTHERWISE, EVEN IF THE
         UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH LOSS.

         6.2         Licensee Indemnification. Licensee will defend, indemnify
                     ------------------------
         and hold harmless the University, its trustees, officers, faculty,
         agents and employees, and students (collectively, the "Indemnified
         Parties") from and against any and all liability, loss, damage, action,
         claim or expense suffered or incurred by the Indemnified Parties
         (including reasonable attorney's fees) (individually, a "Liability"
         and collectively, the "Liabilities") which results from or arises out
         of (a) the development, use, manufacture, promotion, sale, or other
         disposition of the Licensed Technology and any Licensed Products, or
         information, results or inventions arising from the Collaborative
         Research Agreement by Licensee, its Affiliates, assignees, 
         sublicenses, vendors or other third parties; (b) breach by Licensee 
         of any covenant or agreement contained in this Agreement or the 
         Collaborative Research Agreement; (c) Licensee's use of the Research 
         Inventions or any results of the Collaborative Research conducted 
         under the Collaborative Research Agreement and (d) the successful 
         enforcement by an Indemnified Party of its rights under this Section 
         6.2. Without limiting the foregoing, Licensee will indemnify and hold 
         harmless the Indemnified Parties from and against any Liabilities 
         resulting from:
<PAGE>
         License Agreement between PI Research Corporation and Penn           15
         January 2, 1992

             (i) any product liability or other claim of any kind related to the
         use by a third party of a Licensed Product that was manufactured, sold
         or otherwise disposed of by Licensee, its Affiliates, assignees,
         sublicensees, vendors or other third parties;

             (ii) a claim by a third party that the Licensed Technology or the
         design, composition, manufacture, use, sale or other disposition of any
         Licensed Product infringes or violates any patent, copyright, trademark
         or other intellectual property rights of such third party; and

             (iii) clinical trials or studies conducted by or on behalf of
         Licensee relating to the Licensed Products, including, without
         limitation, any claim by or on behalf of a human subject of any such
         clinical trial or study, any claim arising from the procedures
         specified in any protocol used in any such clinical trial or study, any
         claim or deviation, authorized or unauthorized, from the protocols of
         any such clinical trial or study, and any claim resulting from or
         arising out of the manufacture or quality control by a third party of
         any substance administered in any clinical trial or study.

         6.3          Procedures. The Indemnified Party shall promptly notify
                      ----------
         Licensee of any claim or action giving rise to a Liability subject to
         the provisions of Section 6.2. Licensee shall have the right to defend
         any such claim or action, at its cost and expense. Licensee shall not
         settle or compromise any such claim or action in a manner that imposes
         any restrictions or obligations on the University or grants any rights
         to the Licensed Technology, without the University's written consent
         which consent shall not be unreasonably withheld. If Licensee fails or
         declines to assume the defense of any such claim or action within
         thirty (30) days after notice thereof, the University may assume the
         defense of such claim or action for the account and at the risk of the
         Licensee. Licensee shall pay promptly to the Indemnified Party any
         Liabilities to which the foregoing indemnity relates, as incurred. The
         indemnification rights of the University or other Indemnified Party
         contained herein are in addition to all other rights which such
         Indemnified Party may have at law or in equity or otherwise.
         Notwithstanding the foregoing, in the event of settlement, judgment or
         other final resolution of a claim by a third party under Section 6.2
         (ii) hereof requiring Licensee to pay royalties to such third party for
         Licensed Products sold in a given country, Licensee shall have the
         right to credit the full amount of such payment against the royalties
         payable to the University under Section 3.2 for sales of Licensed
         Products in such country, provided however, that for any calendar
         quarter such credits do not exceed fifty percent (50%) of the royalties
         payable to the University in
<PAGE>
         License Agreement between PI Research Corporation and Penn           16
         January 2, 1992

         such Calendar Quarter. Unused credits may be applied in subsequent
         quarters until the credit is fully used.

         6.4          Product Liability Insurance. Beginning with the
                      ---------------------------
         commencement of human clinical trials and, for ten (10) years after
         Licensee ceases manufacturing and marketing the Licensed Products,
         Licensee shall maintain general and product liability insurance in
         amounts not less than $2,000,000 per incident and $2,000,000 in the
         aggregate, issued by an insurance company rated A or better and naming
         the University as an additional insured. The minimum insurance amounts
         specified herein shall not be deemed a limitation on Licensee's
         indemnification liability under this Agreement. Licensee shall provide
         the University with copies of the endorsements to such policies, upon
         request of the University. Licensee shall notify the University at
         least thirty (30) days prior to cancellation of any such coverage. The
         University shall receive a royalty on any insurance award constituting
         compensation to Licensee for lost profits on the sale of Licensed
         Products.

                          Article VII: Patents and Infringement

         7.1        Prosecution of Patents.
                    ----------------------
                    (a) The University shall be responsible for and
         shall control the preparation, prosecution and maintenance, both
         domestic and foreign, of the Licensed Patents and any other rights
         included in the Licensed Technology. Licensee shall have the right, at
         its own expense, to review and comment upon all patent filings, office
         actions and related submissions within such time limits as University
         shall reasonably impose in any given instance. Licensee shall reimburse
         the University for all documented expenses (including legal fees,
         filing and maintenance fees or other governmental charges) incurred
         subsequent to the Effective Date of this Agreement in connection with
         the filing, prosecution and maintenance of the Licensed Patents or
         other Licensed Technology.

             (b) Licensee and the University shall mutually determine the
         countries, both domestic and foreign, where the Licensed Patents will
         be prosecuted and maintained. If Licensee declines to pay for patent
         preparation and filing, prosecution and maintenance costs in any
         jurisdiction, the University may do so at its cost and expense but such
         patents shall be excluded from the definition of Licensed Patents.

             (c) If the University elects not to file, prosecute or maintain any
         patent or patent application included in the Licensed Patents, it shall
         notify Licensee at least sixty (60) days prior to taking, or not
         taking, any action which would result in abandonment, withdrawal, or
         lapse of such patent or patent application. Licensee shall
<PAGE>
         License Agreement between PI Research Corporation and Penn           17
         January 2, 1992

         then have the right to file, prosecute or maintain the patent or patent
         application.

             (d) Licensee may credit against running royalty payments due under
         Section 3.2 herein one hundred percent (100%) of any amount reimbursed
         to University or paid directly by Licensee for the filing, prosecution
         or maintenance of Licensed Patents in the United States or other
         foreign jurisdictions. Such credits are subject to the limitations of
         Section 3.12, but Licensee may apply unused credits from quarter to
         quarter until such credits are used.

             (e) Each party shall cooperate with the other party to execute all
         lawful papers and instruments and to make all rightful oaths and
         declarations as may be necessary in the preparation and prosecution of
         all such patents and other applications and protections referred to in
         this Section 7.1.

         7.2         Ownership. The University shall retain all right, title and
                     ---------
         interest in and to the Licensed Patents or other Licensed Technology.
         Licensee shall have the right, but not the obligation, to enforce the
         Licensed Patents and to prosecute any infringement of the Licensed
         Patents at its own expense. In such an event, the University shall
         cooperate with Licensee, at Licensee's expense. Licensee shall not
         settle or compromise any such suit in a manner that imposes any
         obligations or restrictions on the University or grants any rights to
         the Licensed Technology, without the University's written consent which
         consent shall not be unreasonably withheld.

             (b) If Licensee fails to prosecute such infringement within ninety
         (90) days after receiving notice thereof, the University shall have the
         right, but not the
                                                                -
         obligation, to prosecute such infringement at its own expense. In such
         event, Licensee shall cooperate with the University, at the
         University's expense.

             (c) Any recovery obtained by the prosecuting party as a result of
         such proceeding, by settlement or otherwise, shall be applied first to
         reimburse the expenses of the litigation, dollar for dollar, incurred
         by each of the Licensee or the University, if the University has
         incurred such expenses as prosecuting party or has been subject to
         royalty credits under 7.2(e) herein. Three-fourths of any remaining
         funds shall be paid to the prosecuting party, and one-fourth to the
         other party, be it the Licensee or the University as the case may be.

             (d) In the event that a claim or suit is asserted or brought
         against Licensee that the manufacture or sale of the Licensed Product
         by Licensee or its Affiliates,
<PAGE>
         License Agreement between PI Research Corporation and Penn         18
         January 2, 1992

         subsidiaries, or sublicensees, or the use of the Licensed Product by
         any customer of the foregoing entities infringes a patent or patents of
         a third party, Licensee shall give written notice of such claim or suit
         to the University. Licensee may in its sole discretion decide to change
         or modify the Licensed Product to avoid such infringement or, if no
         such change is made, to settle on terms that Licensee deems in its sole
         discretion right and proper, subject to subsection (g) below.
         Otherwise, Licensee shall have the right, but not the obligation, to
         defend any such claims or suit for infringement brought against it by
         the third party and if required by law or if requested by University,
         to join University as a party defendant. In the event Licensee elects
         not to defend such claim or suit, the University shall have the option
         to defend such claim or suit.

             (e) In the event Licensee (i) initiates an action to enforce
         Licensed Patents or (ii) defends a suit for infringement, Licensee may
         credit against royalties due under this Agreement an amount equal to up
         to fifty percent(50%) of expenses incurred but not recovered in
         bringing such action or defending such suit. Licensee will make an
         accounting of all such expenses as part of its reporting obligations
         under Article 3. The limitations on the use of royalty credits as
         described in Paragraph 3.12 shall not apply to credits granted under
         7.2(e) herein. Unused credits in any given Calendar Quarter may be
         carried into subsequent quarters until all credits are used.

             (f) Licensee shall have the sole right in accordance with the terms
         and conditions herein to sublicense any alleged infringer of the
         Licensed Patents to prevent future infringements. Amounts received from
         any such sublicensee constituting retroactive royalties shall be
         considered amounts received in settlement and accounted for under
         Section 7.2(c) above. Otherwise, amounts received from such sublicensee
         shall be treated as sublicense revenues under Section 3.2(c) above.

             (g) Licensee shall not compromise or settle any claim or action in
         any manner that would affect the rights of the University without the
         consent of the University. The University shall not compromise or
         settle any claim or action in any manner that would affect the right of
         the Licensee without the consent of Licensee.

             (h) Nothing contained in this Section 7.2 shall be deemed to limit
         in any way Licensee's indemnification obligations under Sections 6.2
         and 6.3 of this Agreement.

         7.3          Certain Notices. Licensee shall notify the University at
                      ---------------
         least sixty (60) days before the Licensee uses or exports the Licensed
         Technology or any Licensed Product in or to any country outside of the
         United States, to allow
<PAGE>
         License Agreement between PI Research Corporation and Penn           19
         January 2, 1992

         the University to make any patent filings or to take other actions
         necessary to protect the Licensed Technology.


                       Article VIII: Confidentiality

          Confidentiality.
          ---------------

                      (a) During the term of this Agreement and for a
         period of [          ] thereafter, Licensee and its
         sublicensees shall maintain in confidence and shall not disclose to
         any third party the Confidential Information received pursuant to the
         Agreement, without the prior written consent of the University. The
         foregoing obligation shall not apply to:

             (i) information that is known to Licensee or independently
         developed by Licensee prior to the time of disclosure, in each case, to
         the extent evidenced by written records promptly disclosed to the
         University upon receipt of the Confidential Information;

             (ii) information disclosed to Licensee by a third party that has a
         right to make such disclosure;

             (iii) information that becomes patented, published or otherwise
         part of the public domain as a result of acts by the University or a
         third person obtaining such information as a matter of right; or

             (iv) information that is required to be disclosed by order of the
         U.S. Food and Drug Administration or similar authority or a court of
         competent jurisdiction; provided that the parties shall use their best
         efforts to obtain confidential treatment of such information by the
         agency or court.

             (b) Licensee will take all reasonable steps to protect the
         Confidential Information of the University with the same degree of care
         Licensee uses to protect its own confidential or proprietary
         information. Without limiting the foregoing, Licensee shall ensure that
         all of its employees having access to the Confidential Information of
         the University are obligated to abide by Licensee's obligations
         hereunder.

             (c) The University shall not be obligated to accept any
         Confidential Information of the Licensee. If Licensee desires to
         furnish any such Confidential Information to any University personnel,
         Licensee may request such individual to sign a confidentiality
         agreement with Licensee in the form of Attachment 3 to Attachment F
         hereto. The University bears no institutional responsibility
<PAGE>
         License Agreement between PI Research Corporation and Penn          20
         January 2, 1992

         for maintaining the confidentiality of any Confidential Information of
         Licensee.

         8.2        Publication.
                    -----------
                    (a) Licensee acknowledges that the basic
         objective of research and development activities of the University is
         the generation of new knowledge and its expeditious dissemination. To
         further that objective, the University retains the right, at its
         discretion, to demonstrate, publish or publicize a description of the
         Licensed Technology and any results of research conducted by the
         University with the Licensed Technology, subject to the provisions of
         clauses (b) and (c) below.

             (b) Should the University desire to disclose publicly, in writing
         or by oral presentation, Confidential Information related to the
         Licensed Technology for which a patent application has not been filed,
         the University shall notify Licensee in writing of its intention at
         least thirty (30) days before submission of such material that would
         make such disclosure. The University shall include with such notice a
         description of the oral presentation or, in the case of a manuscript or
         other proposed written disclosure, a current draft of such written
         disclosure. Licensee may request the University, no later than thirty
         (30) days following the receipt of the University's notice, to file a
         patent application, copyright or other appropriate form of intellectual
         property protection related to the information to be disclosed. All
         such filings shall be subject to the provisions of Section 7.1 of this
         Agreement. Upon receipt of such request, the University shall arrange
         for a short delay in publication, not to exceed sixty (60) days, to
         permit filing of a patent or other application by the University, or if
         the University declines to file such application, to permit Licensee to
         make such a filing. If University receives no such request from
         Licensee to delay submission of material making such disclosure,
         University may submit such material for publication or presentation
         provided that University first confirms in a reasonable way that
         Licensee has received and reviewed such materials.

             (c) If the University desires to demonstrate, publish or publicize
         Confidential Information related to the Licensed Technology that is not
         patentable in the United States, and Licensee objects to such proposed
         disclosure within the time period specified in clause (b) above, the
         parties will negotiate in good faith to determine whether the proposed
         disclosure can be modified or withheld, consistent with the objectives
         of each party. In no event shall the University be prohibited from
         proceeding with any such publication.

             Use of Name. Nothing contained in this Agreement shall be construed
             -----------
         as conferring any right to use any name,
<PAGE>
         License Agreement between PI Research Corporation and Penn           21
           ~
         January 2, 1992

         trade name, trademark, or other designation of either party hereto
         (including any contraction, abbreviation or simulation of any of the
         foregoing), or the name of any trustee, director, officer or employee
         thereof, without the express prior written approval of the affected
         party, except where, upon advice of counsel, such use is required to
         comply with any law or regulation of a governing body having
         jurisdiction over a party or over the making, using or selling of a
         Licensed Product. Each party hereto further agrees not to use or refer
         to this Agreement or any license granted hereunder in any promotional
         activity associated with Licensed Products, without the express prior
         written approval of the other party.

                             Article IX: Term and Termination

         9.1         Term. This Agreement and the license granted herein shall
                     ----
         commence on the date first set forth above and shall continue, subject
         to earlier termination under Sections 9.2 or 9.3 hereof, [         ]

         9.2        Termination by the University.
                    -----------------------------
                    (a) Upon the occurrence of any of the events set
         forth below ("Events of Default"), the University shall have the right
         to terminate this Agreement by giving written notice of termination,
         such termination effective as described in each event:

                        (i) nonpayment of any amount payable to the
         University that is continuing [          ] calendar days
         after the University gives licensee written notice of such
         nonpayment;

             (ii) breach by Licensee of any covenant (other than a payment
         breach referred to in clause (i) above) or any representation or
         warranty contained in this Agreement that is continuing [   ] calendar
         days after the University gives Licensee written notice of such breach;
         notwithstanding the foregoing, if Licensee violates the laws,
         regulations or other legal authority in any jurisdiction relating to
         the development, use, storage, or marketing of the Licensed Products in
         a way that the University deems in its reasonable judgment to
         constitute a public safety or health hazard, the University may
         immediately terminate the license hereunder in the applicable
         jurisdiction, but the remainder of the Agreement shall continue in all
         other jurisdictions.

             (iii) Licensee fails to comply with the terms of the license
         granted under Section 2.1 hereof and such noncompliance is continuing
         [   ] calendar days
<PAGE>
         License Agreement between PI Research Corporation and Penn          22
         January 2, 1992

         after the University gives Licensee notice of such noncompliance;

             (iv) Licensee becomes subject to a Bankruptcy Event;

             (v) the dissolution or cessation of operations by Licensee.

             (b) No exercise by the University of any right of termination shall
         constitute a waiver of any right of the University for recovery of any
         monies then due to it hereunder or any other right or remedy the
         University may have at law or under this Agreement.

         9.3         Termination by Licensee. Licensee shall have the right to
                     -----------------------
         terminate this Agreement, at any time and with or
         without cause, [     ] written notice to the University.

         9.4         Rights and Duties Upon Termination. Within thirty (30) days
                     ----------------------------------
         after termination of this Agreement, each party shall return to the
         other party any Confidential Information of the other party. Licensee
         shall provide the University with a written inventory of all Licensed
         Products in process of manufacture or in stock, and Licensee (and its
         Affiliates and sublicensees) shall have the privilege of disposing of
         such Licensed Products in process of manufacture or in stock at the
         time notice of termination is served, provided, however, that Licensee
         shall pay royalties on any Net Sales of such Licensed Products at the
         rate and at the time herein provided and shall render reports thereon
         in the manner herein provided.

         9.5         Sublicenses. Any sublicense granted by Licensee under
                     -----------
         Sections 2.1 and 2.3 of this Agreement may survive termination in
         accordance with the terms of such sublicense, provided however, that
         such sublicensee becomes the direct licensee of the University.

         9.6         Provisions Surviving Termination. Licensee's obligation to
                     --------------------------------
         pay any royalties accrued but unpaid prior to termination of this
         Agreement shall survive such termination. In addition, Sections 2.5,
         3.8, 3.9, 7.1, 7.2, 8.1. 8.3, 9.4, 9.5, 9.6, 9.7, 10.1, 10.5 and
         Articles 5 and 6 and any other provisions required to interpret the
         rights and obligations of the parties arising prior to the termination
         date shall survive expiration or termination of this Agreement.

         9.7         Notification and Authorization under Drug Price Competition
                     -----------------------------------------------------------
         and Patent Term Restoration.
         ---------------------------
             (a) The University shall notify Licensee of (i) the issuance of 
         each U.S. patent included within the
<PAGE>
         License Agreement between PI Research Corporation and Penn           23
         ~a January 2, 1992

         Licensed Patents, giving the date of issue and patent number for each
         such patent, and (ii) each notice pertaining to any patent included
         within the Licensed Patents which it receives as patent owner pursuant
         to the Drug Price Competition and Patent Term Restoration Act (the
         "Act"), including but not necessarily limited to notices pursuant to
         section 101 and 103 of the Act from persons who have filed an
         abbreviated NDA or a "paper" NDA. Such notices shall be given promptly,
         but in any event within ten (10) days of each such patent's date of
         issue or receipt of each such notice pursuant to the Act, whichever is
         applicable.

             (b) The University hereby authorizes Licensee to include in any NDA
         for a Licensed Product, as Licensee may deem appropriate under the Act,
         a list of patents included within the Licensed Patents identifying the
         University as patent owner that relate to such Licensed Product and
         such other information as is required to be filed pursuant to the Act.
         The University agrees as patent owner under the Act to apply for an
         extension of the term of any patent included within the Licensed
         Patents, as patent owner under the Act, upon request by and at the
         expense of Licensee. The University also agrees to execute such
         documents and take such additional action as the U.S. Patent and
         Trademark Office or U.S. Food and Drug Administration may require in
         connection therewith; provided however, that the University's costs in
         connection with this Section 9.7 are reimbursed by Licensee.

                             Article X: Additional Provisions

          10.1      Arbitration.
                    -----------
                    (a) All disputes arising between the University
         and Licensee under this Agreement shall be settled by arbitration
         conducted in the English language in accordance with the Commercial
         Arbitration Rules of the American Arbitration Association relating to
         voluntary arbitrations with a panel of three arbitrators. The parties
         will cooperate with each other in causing the arbitration to be held in
         as efficient and expeditious a manner as practicable. Any arbitration
         proceeding instituted by either party under this Agreement shall be
         brought in Philadelphia, Pennsylvania.

             (b) Any award rendered by the arbitrators shall be final and
         binding upon the parties hereto. Judgment upon the award may be entered
         in any court of record of competent jurisdiction. Each party shall pay
         its own expenses of arbitration and the expenses of the arbitrators
         shall be equal shared unless the arbitrators assess as part of their
         award all or any part of the arbitration expenses of one party
         (including reasonable attorneys' fees) against the other party.
<PAGE>
         License Agreement between PI Research Corporation and Penn          24
         January 2, 1992

         10.2        Assignment. No rights hereunder may be assigned by the
                     ----------
         Licensee directly, unless by merger or acquisition of Licensee, without
         the express written consent of the University; provided, however, that
         Licensee may assign the same to an Affiliate that assumes all
         obligations of Licensee under this Agreement or to any entity in 
         connection with any merger, acquisition or sale of all or 
         substantially all of its business relating to the Licensed 
         Products. Any prohibited assignment of this Agreement or rights 
         hereunder shall be null and void. No assignment shall relieve 
         Licensee of-responsibility for the performance of any accrued 
         obligations which it has prior to such assignment less the 
         University consents in writing to the release of such accrued 
         obligations. This agreement shall inure to the benefit of 
         permitted assigns of Licensee.

         10.3        No Waiver. A waiver by either party of a breach or
                     ---------
         violation of any provision of this Agreement will not constitute or be
         construed as a waiver of any subsequent breach or violation of that
         provision or as a waiver of any breach or violation of any other
         provision of this Agreement.

         10.4        Independent Contractor. Nothing herein shall be deemed to
                     ----------------------
         establish a relationship of principal and agent between the University
         and Licensee, nor any of their agents or employees for any purpose
         whatsoever. This Agreement shall not be construed as constituting the
         University and Licensee as partners, or as creating any other form of
         legal association or arrangement which could impose liability upon one
         party for the act or failure to the act of the other party.

         10.5        Notices. Any notice under this Agreement shall be
                     -------
         sufficiently given if sent in writing by prepaid, first class,
         certified or registered mail, return receipt requested, addressed as
         follows:

         if to the University, to:
                        University of Pennsylvania Center for Technology
                        Transfer 133 South 36th Street, Suite 419 
                        Philadelphia, PA 19104
                        Attn: Director
         with copy to:
                        Office of the General Counsel University of Pennsylvania
                        110 College Hall 
                        Philadelphia, PA 19104
                        Attn: General Counsel
<PAGE>
         License Agreement between PI Research Corporation and Penn          25
         January 2, 1992

         if to Licensee, to:

                        PI Research Corporation c/o Mr. Robert Kunze
                              Hambrecht & Quist Life Science
                            Venture Partners One Bush Street
                        San Francisco, CA 94104
                             Attn: Chief Executive Officer

         with copy to:
                              Hambrecht & Quist Life Science
                            Venture Partners One Bush Street
                        San Francisco, CA 94104
                                  Attn: Mr. Robert Kunze

         with copy to:
                        Cooley Godward Castro Huddleson & Tatum One Maritime
                        Plaza, 20th Floor San Francisco, CA 94111
                             Attn: Kenneth L.Guernsey, Esq.

         or to such other addresses as may be designated from time to time by
         Notice given in accordance with the terms of this Section.

         10.6        Entire Agreement. This Agreement embodies the entire
                     ----------------
         understanding between the parties relating to the subject matter hereof
         and supersedes all prior understandings and agreements, whether written
         or oral. This Agreement may not be varied except by a written document
         signed by duly authorized representatives of both parties.

         10.7        Severability. Any of the provisions of this
                     ------------
         Agreement which are determined to be invalid or unenforceable in any
         jurisdiction shall be ineffective to the extent of such invalidity or
         unenforceability in such jurisdiction, without rendering invalid or
         unenforceable the remaining provisions hereof or affecting the validity
         or unenforceability of any of the terms of this Agreement in any other
         jurisdiction.

         10.8        Headings. Any headings and captions used in this Agreement
                     --------
         are for convenience or reference only and shall not affect its
         construction or interpretation.

         10.9        No Third Party Benefits. Nothing in this Agreement, express
                     -----------------------
         or implied, is intended to confer on any person other than the parties
         hereto or their permitted assigns, any benefits, rights or remedies.
<PAGE>
         License Agreement between PI Research Corporation and Penn          26
         January 2, 1992

         10.10             Governing Law. This Agreement shall be construed,
                           -------------
         governed, interpreted and applied in accordance with the laws of the
         State of Delaware, without giving effect to conflict of law provisions.

         10.11             Counterparts. This Agreement shall become binding
                           ------------
         when any one or more counterparts hereof, individually or taken
         together, shall bear the signatures of each of the parties hereto. This
         Agreement may be executed in any number of counterparts, each of which
         shall be deemed as original as against the party whose signature
         appears thereon, but all of which taken together shall constitute but
         one and the same instrument.

             IN  WITNESS WHEREOF,  the parties  hereto  have duly  executed this
         License Agreement as of the date first above written.


         For The Trustees of the        For PI Research Corporation
         University of Pennsylvania     


         /s/ Stephen M. Sammut          /s/ Robert Kunze
         ---------------------------    ---------------------------
         Stephen M.Sammut               Robert Kunze
         Director, Center for           Chairman
              Technology Transfer


         Agreed to and Acknowledged:


         /s/ Harvey Rubin               /s/ Barry Cooperman
         -------------------------      -----------------------
         Dr. Harvey Rubin               Dr. Barry Coopenman
         Principal Investigator         Investigator 


         /s/ Norman Schechter           /s/ Zhai-Mei Wang
         -------------------------      ------------------------
         Dr. Norman Schechter           ~Dr. Zhai-Mei Wang
         Investigator                   Investigator
<PAGE>
         Attachment  A:  Protatek  Cooperative  Research  Agreement  
                         of  10/1/87 ("Protatek CRA")
<PAGE>
                      Cooperative Research
                      Agreement Between
                      University of Pennsylvania
                      and Protatek International
<PAGE>
Table of Contents

Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . 1
     1.1   Field of the Agreement   . . . . . . . . . . . . . . . . . . . 1
     1.2   Sponsored Research   . . . . . . . . . . . . . . . . . . . . . 1
     1.3   The General Research   . . . . . . . . . . . . . . . . . . . . 1
     1.4   Specific Research  . . . . . . . . . . . . . . . . . . . . . . 1
     1.5   Proprietary Information  . . . . . . . . . . . . . . . . . . . 1
     1.6   Confidential Information   . . . . . . . . . . . . . . . . . . 1
     1.7   Invention  . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     1.8   Patent Expenses  . . . . . . . . . . . . . . . . . . . . . . . 2
     1.9   Principal Investigators  . . . . . . . . . . . . . . . . . . . 2

Article 2. Sponsored Research . . . . . . . . . . . . . . . . . . . . . . 2
     2.1   Sponsored Research will consist of both the General
           Research protocol and Specific Research projects . . . . . . . 2

Article 3. Payment  . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
     3.1   Protatek agrees to pay to PENN   . . . . . . . . . . . . . . . 2
     3.2   PENN is under no obligation to fund  . . . . . . . . . . . . . 2
     3.3   When three or more Research Projects   . . . . . . . . . . . . 2

Article 4. Reports  . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Article 5. Publication  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     5.1   PENN retains the right to publish the results. . . . . . . . . 3
     5.2   All publications will be treated as invention disclosures. . . 3
     5.3   PENN agrees to use its best efforts in its publications not
           to jeopardize  . . . . . . . . . . . . . . . . . . . . . . . . 3

Article 6. Handling of Confidential Information   . . . . . . . . . . . . 3
     6.1    Each party to this agreement will handle  . . . . . . . . . . 3
     6.2    In order to minimize the potential  . . . . . . . . . . . . . 3
     6.3    Such obligations of confidentiality and limited use . . . . . 3

Article 7. Title to Inventions ..........................................

 Article 8. Patent Applications and Expenses  . . . . . . . . . . . . . . 4
 .    8.1   Control of the preparation. . . . . . . . . . . . . . . . .    4
     8.2   All expenses  . . . . . . . . . . . . . . . . . . . . . . . .  4

  Article 9. Transfer of Rights to Commercialize Intellectual Property
            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4


    9.1    From time 10 time, the results of the General
            Research    . . . . . . . . . . . . . . . .. . . . . . . . .  4
    9.1.1  The Research Results are of no interest to
                      Protatek  . . . . . . . . . . . .  . . . . . . . .  4

    9.1.2   The Research Results are insufficient to
            support a viable patent   . . . . . . . . . . . . . . . . . . 4
    9.1.3   The Research Results can be demonstrated
            to have been previously known   . . . . . . . . . . . . . . . 4
<PAGE>
             9.1.4   The Research Results are of commercial
                              interest to Protatek   . . . . . . . . . . . . 5
             9.2   If the Research Results are insufficiently described or
                    incomplete   . . . . . . . . . . . . . . . . . . . . . . 5
             9.3   If Protatek should elect not to file a patent application 5
             9.4   PENN hereby grants and Protatek hereby accepts . . . . . .5
             9.5   Should Protatek and PENN fail to reach agreement
                    regarding the terms  . . . . . . . . . . . . . . . . . . 5

         Article 10. Term and Termination  . . . . . . . . . . . . . . . . . 6
             10.1   The intent of the parties  . . . . . . . . . . . . . . . 6
             10.2   Should either party to this agreement be at fault. . . . 6
             10.3   Protatek may terminate this agreement  . . . . . . . . . 6
             10.4   PENN may terminate this Agreement  . . . . . . . . . . . 6
             10.5   Surviving termination  . . . . . . . . . . . . . . . . . 6

         Article 11. Miscellaneous   . . . . . . . . . . . . . . . . . . . . 6
              11.1  Notice   . . . . . . . . . . . . . . . . . . . . . . . . 6
                    ------
              11.2  Use of name  . . . . . . . . . . . . . . . . . . . . . . 7
                    -----------
              11.3  Scope  .  . . . . . . . . . . . . . . . . . . . . . . .  7
                    -----
              11.4  Assignability  . . . . . . . . . . . . . . . . . . . . . 7
                    -------------
              11.5  Venue  . . . . . . . . . . . . . . . . . . . . . . . . . 7
                    -----
                    IN WITNESS WHEREOF   . . . . . . . . . . . . . . . . . . 7
<PAGE>
             THIS AGREEMENT, effective  the 1st day  of August  1988, is by  and
         between The Trustees of The University of Pennsylvania, with offices at
         133  South 361h  Street Philadelphia,  PA 19104 ("PENN"),  and Protatek
         International, Inc with offices in Minneapolis, MN 55108 ("Protatek").

             WHEREAS, Dr. Harvey Rubin and Dr. Barry S. Cooperman, faculty
         members of the PENN are interested in studying Protease Inhibitors, and

             WHEREAS, Protatek is interested in such research and wishes to
         commercially develop and exploit the results of such research for the
         good of mankind; and

             WHEREAS, PENN has determined that the research program contemplated
         by  this Agreement furthers  the educational, scholarship  and research
         objectives of PENN as a nonprofit tax-exempt educational institution;

                  NOW, THEREFORE be it agreed among the parties as follows:

         Article 1. Definitions.

         1.1   Field of the Agreement means research related to, the production
               of, or any application of Protease Inhibitors derived from 
               peptides or compounds, methods, know-how, or improvements 
               derived therefrom.

         1.2   Sponsored Research means research performed at PENN with the
               support of Protatek in one or both of two categories: (1) 
               General Research in the Field of the Agreement; and (2) Specific 
               Research directed at potential products and applications of 
               compounds and their derivatives in the Field of the Agreement
               which may result from General Research.

         1.3   The General Research protocol and budget is described in
               Attachment A and is included herein by reference.

         1.4   Specific Research projects may be defined and included in this
               document as addendum labeled "Addendure SRP - n" (where n is the 
               number of the addendum).

         1.5  Proprietary  Information means  any information,  idea  or concept
              which has been  learned or developed by one  party without the aid
              of  the other  party and which  is not generally  available to the
              public.

         1.6    Confidential Information means Proprietary lnformation or
                information developed as unpublished results of Sponsored 
                Research and is marked as such. Excluded from Confidential 
                Information is any information which:

         1.6.1  is within or comes within the public knowledge (but
                only when it so becomes), or 


                                      1
<PAGE>
         1.6.2  developed  independently by  either  party to  this
                agreement outside of  the scope of  this Agreement,
                or

         1.6.3  revealed to either party by third parties authorized to
                reveal such information and under no obligation of 
                confidentiality to either party to this agreement.

         1.7    Invention means any idea, improvement, or enhancement, whether
                patentable or not, which results from Sponsored Research.

         1.8   Patent Expenses means all out-of-pocket expenses directly related
               to  the preparation,  filing,  prosecution  and issuance  of any
               domestic or foreign patent application(s) covering Inventions.

         1.9   Principal Investigators means-Dr. Rubin and/or Dr. Cooperman or
               should the services of either of these two not be available to 
               PENN for any reason, any replacement whom PENN can offer who is 
               acceptable to Protatek as indicated in writing, within sixty 
               (60) days after the unavailability of either original Principal
               Investigator.

         Article 2. Sponsored Research.

         2.1   Sponsored Research will consist of both the General Research
               protocol and Specific Research projects as dictated by General 
               and/or Specific Research results and as agreed to between the 
               parties in writing. Once executed by both parties in writing,
               such Specific Research Project Addenda will be included as
               integral parts of this document. The Specific Research protocols 
               and budgets as outlined in the Addenda may draw funds and 
               research time away from the General Research protocol, or they
               may involve additional resources in terms of time and funding as
               agreed to by the parties.

         Article 3. Payment.

         3.1   Protatek agrees to pay to PENN certain moneys in order to
               partially defray the cost to PENN of the Sponsored Research. 
               The schedule of payments for moneys to be paid by Protatek to 
               PENN are contained in the Attachment B to this document which
               is included herein by reference and which may be amended from
               time to time by mutual written agreement between the parties.

         3.2    PENN is under no obligation to fund any of the Sponsored
                Research.

         3.3    When three or more Research Projects are defined and have not
                been terminated, Protatek agrees to pay PENN an additional 
                [    ] per year for administration of intellectual property 
                rights.


                                      2
<PAGE>
         Article 4. Reports.
         4.1   Principal Investigators will generally administer and supervise 
               the Sponsored- Research, and will submit annual written 
               scientific reports.

         Article 5. Publication.

         5.1   PENN retains the right to publish the results of Sponsored
               Research in scholarly journals and meetings, subject to the 
               provisions of this Article and Article 6.

         5.2  All publications will be treated  as invention disclosures for the
              purposes of review  by Protatek  for the  potential disclosure  of
              patentable  inventions. Copies  of  all  proposed publications  or
              abstracts which  result from  Sponsored Research will  be sent  to
              Protatek at least forty-five (45)  days in advance of the expected
              publication  or presentation  date. Should  Protatek  believe that
              such  publication or abstract  would constitute the  disclosure of
              patentable material, Protatek will promptly notify PENN in writing
              of  the relevant  material,  and PENN  will  delay publication  or
              presentation of such  article or abstract until either  (a) a U.S.
              patent application has  been filed, or  (b) the relevant  material
              has been  sufficiently deleted  from the  proposed publication  or
              abstract  so as  not to  present an  obvious public  disclosure of
              patentable material. However, in no event will the requirements of
              (a) or (b) above be allowed to take longer than one hundred twenty
              (120) days.

         5.3   PENN agrees to use its best efforts in its publications not to
               jeopardize the commercial value of the results of Sponsored 
               Research and will bear in mind the editorial comments of 
               Protatek regarding disclosure of non-patentable material and 
               potential trade secrets.

         Article 6. Handling of Confidential Information.

         6.1   Each party to this agreement will handle the other party's
               confidential information with the same degree of security and 
               confidentiality with which it maintains its own confidential 
               information, and will not use such information for any commercial
               purpose without first obtaining license from the owning party.

         6.2  In order  to minimize the  potential for accidental  disclosure of
              Confidential  Information, neither party will give the other party
              any  Confidential  Information  which  is  not  essential  to  the
              performance  of  the   Supported  Research.  Further,   any  party
              receiving  Confidential Information retains the right to refuse to
              accept Confidential Information which it feels is not essential to
              the Supported Research.

         6.3  Such obligations of confidentiality and limited use of
              information shall be maintained for a minimum of [    ] from the
              date of receipt of any Confidential Information by either party.


                                      3
<PAGE>
         Article 7. Title to Inventions.

        7.1    Title to any Inventions made by personnel employed by Protatek
               will belong to Protatek. Title to any Inventions made by 
               personnel employed by PENN will belong to PENN. Title to 
               Inventions made jointly by personnel employed by Protatek and
               personnel employed by PENN will belong jointly to Protatek and
               PENN.

         Article 8. Patent Applications and Expenses.

         8.1  Control of the preparation,  filing and prosecution of  all patent
              applications will  reside  with  the  party to  whom  the  covered
              Invention belongs. In the case of joint ownership, control will be
              joint. However, both  parties will cooperate  as necessary in  the
              preparation, filing  and prosecution  of all patent.  applications
              covering Inventions.

         8.2   All expenses related to the preparation, filing or prosecution of
               patent applications covering Inventions which belong either 
               jointly or solely to Protatek will be borne by Protatek. All 
               expenses related to the preparation, filing or prosecution of 
               patent applications covering Inventions which belong solely to 
               PENN, but which Protatek wishes to make subject to the grant of 
               the following section will be borne by Protatek. All patent 
               expenses related to applications covering Inventions not subject
               to the grant of the following section will be borne by the party
               to whom the Invention belongs.

         Article 9. Transfer of Rights to Commercialize Intellectual Property.

         9.1   From time to time. the results of the General Research or the
               Specific Research protocols may produce results which may be 
               patentable and which may become the basis for a (further) 
               Specific Research Protocol. If at any time either party believes
               that any research results (from either General Research or
               Specific Research) should become the subject of applications 
               for letters patent, that party will promptly notify the other 
               party in writing, giving the details of such results.
               Within thirty (30) days of receipt of notice by Protatek from 
               PENN, or concurrent with delivery of notice by Protatek to PENN, 
               Protatek will inform PENN as to which of the following
               categories such research results belong:

         9.1.1 The Research Results are of no interest to Protatek and
               shall not be subject to the Grant of Article 9.4, and related 
               patent expenses shall not be borne by Protatek.

        9.1.2  The Research  Results are insufficient to support a
               viable patent application,  but Protatek elects  to
               retain commercial rights to the research results.

        9.1.3  The Research Results can be demonstrated to have been
               previously known by Protatck and developed independently by 
               Protatek and are not therefore


                                     4
<PAGE>
                subject to this Agreement.

        9.1.4   The  Research  Results  are  of commercial  interest  to
                Protatek, are subject  to the grant of  Paragraph 9.4 of
                this   article  and  Protatek   agrees  to  bear  Patent
                Expenses.  Such Research Results may be  of two types as
                further elected by Protatek:

        9.1.4.1 The subject of a new Specific Research Addendum; or

        9.1.4.2 The subject  of either a previous Specific Research
                Addendum  or to  remain  as  part  of  the  General
                Research Protocol.

        9.2    If the Research Results are insufficiently described or
               incomplete so that it becomes impossible for Protatek to make 
               the above election without further description or
               consultation by PENN Protatek may hold such election in abeyance
               until either:
               PENN provides sufficient detail; or additional research results
               are obtained. In no event however, will such delay exceed ninety 
               (90) days from the receipt of notice by Protatek from PENN 
               unless specifically agreed to in writing by the parties.

         9.3   If Protatek should elect not to file a patent application under
               the provisions of sub-paragraph 9.1.2 for a particular research 
               result, and PENN files, prosecutes and is issued a U.S. patent 
               covering these same research results at its own expense, then
               any license to Protatek from PENN under such patent will be
               subject to an additional [    ] on end-products covered by such 
               patent.

         9.4  PENN hereby grants and Protatek hereby accepts the exclusive 
              first right to negotiate in good faith for exclusive world-wide 
              license(s) (such license(s) may be non-exclusive
              at Protatek's sole discretion) under any patent for which it has 
              borne or will bear Patent Expenses. Such grant for any specific 
              patent application will automatically terminate six (6) months 
              from the official date of receipt by the U.S. Patent and
              Trademark Office of the relevant patent application unless said 
              grant is exercised as evidenced by: (i) both beginning good faith 
              negotiations and (2) agreement to pay any related Patent Expenses.
              The details of each license agreement will vary from
              technology to technology but will generally follow the format of 
              the License Agreement attached hereto as Attachment C and 
              included herein by reference. The earned royalties on net sales 
              of end-products in such license agreements will generally be 
              between [     ] unless either party can provide compelling as to 
              why appropriate.

         9.5  Should Protatek and PENN fail to reach agreement regarding the
              terms of such license, PENN will be free to negotiate license 
              terms with third parties. However, should third party 
              negotiations lead to license terms by PENN essentially similar 
              to those last offered by Protatek, Protatek will be given the 
              opportunity to take license on such terms, before any third 
              party.


                                     5
<PAGE>
         Article 10. Term and Termination.

        10.1   The intent of the parties is that the relationship developed
               herein shall continue from year to year on an on-going basis 
               from the date first written above unless terminated under the 
               provisions included below in this Article or paragraph 1.9.

        10.2   Should either party to this agreement be at fault under the terms
               of this agreement, the other party may terminate this agreement 
               by giving [     ] written notice of intent to terminate and the 
               nature of the fault. If such fault is not corrected within the 
               [     ] period, this agreement will terminate with the expiration
               of the [     ] period.

        10.3   Protatek may terminate this agreement upon [    ] prior written 
               notice to PENN.

        10.4   PENN may terminate this Agreement upon [   ] prior written notice
               to Protatek if PENN can demonstrate that has notit est efforts 
               or has substantially failed to commercialize the results of 
               Sponsored Research, and which failure is not corrected 
               during said [    ] period.
 
        10.5   Surviving termination of this agreement are the provisions of
               confidentiality and limited use of information contained in 
               article 9, the grant of article 8, and any licenses which may 
               have been negotiated between the parties.

         Article 11. Miscellaneous.

         11.1  Notice. Any notice required under this agreement will be
               ------
               considered given one day after such notice, properly addressed 
               and shipped overnight service, is sent by either party. Proper 
               address for notice is as follows:

               if to PENN:
               Office of Corporate Programs & Technology University of
               Pennsylvania Suite 300
               133 South 36th Street 
               Philadelphia, PA 19104


                                  6
<PAGE>
               if to Protatek: 
                      President
                      Protatek International, Inc. 
                      1425 Energy Park Drive
                      Minneapolis, MN 55108

        11.2  Use of name. Neither party will use the name, insignia or logo
              -----------
              of the other party for any purpose without the prior express 
              written consent of the other party.

        11.3  Scope. This Agreement constitutes the entire agreement between the
              -----
              parties and it reflects and dissolves all prior agreements and 
              drafts related to the subject matter hereof. This agreement may 
              be amended truly by mutual written agreement between the parties.

        11.4   Assignability. This Agreement shall be binding upon and enure to
               -------------
              the parties hereto, their successors and asignees, provided 
              however, that any such assignment by Protatek will require the 
              written approval of PENN. Such approval by PENN will not be 
              withheld by PENN except for reason of situations which might 
              jeopardize the policies, the good name of PENN, or its mission.

        11.5   Venue. This Agreement will be interpreted in and according to the
               -----
              laws of the Commonwealth of Pennsylvania.

              1N WITNESS WHEREOF, both parties set their hand

               for Protatek:,                       for PENN:
              
        /s/                                         /s/ George C. Sambeck
        -----------------------------               -------------------------
               Signed                               Signed 


                                                    Assoc. Dir.
        -----------------------------               -------------------------
               Title                                 Title

                                                    9/21/88
        -----------------------------               -------------------------
               Date                                  Date


                                   7
<PAGE>
         Attachment B: Protatek Alpha-1 Antichymotrypsin License
<PAGE>
                                License Agreement Between
                    The Trustees of The University of Pennsylvania and
                                Protatek International, Inc. 
                                (alpha-1 Antichymotrypsin)
<PAGE>
       Table of Contents:

       Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . . . . . 1
            1.1.  Licensed Technology  . . . . . . . . . . . . . . . . . . . . 1
            1.2.  Licensed Patent  . . . . . . . . . . . . . . . . . . . . . . 1
            1.3.  Ultimate Consumer  . . . . . . . . . . . . . . . . . . . . . 2
            1.4.  Licensed Product(s)  . . . . . . . . . . . . . . . . . . . . 2
            1.5.  Net Sales  . . . . . . . . . . . . . . . . . . . . . . . . . 2
            1.6.  Protatek is understood to include all of its Affiliates. . . 2

       Article 2. Grant  . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
             2.1. PENN grants to Protatek  . . . . . . . . . . . . . . . . . . 2

       Article 3. Compliance with Laws, Regulations and Standards  . . . . . . 2
            3.1.  Protatek agrees to comply with .all governmental   . . . . . 2
            3.2.  With respect to operations by the Protatek   . . . . . . . . 2

       Article 4. Consideration  . . . . . . . . . . . . . . . . . . . . . . . 3
            4.1.  In consideration of the rights granted herein, License shall
       pay to
                  PENN certain amounts   . . . . . . . . . . . . . . . . . . . 3
             4.2  All amounts due hereunder  . . . . . . . . . . . . . . . . . 3

       Article 5. Reports, Payments and Accounting   . . . . . . . . . . . . . 3
            5.1.  Protatek agrees to make written reports to PENN  . . . . . . 3
            5.2.  Protatek also agrees to make a similar written report to
       PENN within
                  three months after the date of the Termination   . . . . . . 3
            5.3.  Concurrently with the making of each report  . . . . . . . . 3
            5.4.  Protatek agrees to keep records showing the manufacture,
       sales, use,
                  rentals, and leasing   . . . . . . . . . . . . . . . . . . . 3

       Article 6. Warranties and Indemnities   . . . . . . . . . . . . . . . . 3
             6.1.  Nothing in this Agreement shall be construed  . . . . . . . 3
             6.2.  PENN makes no representations and extends no warranties . . 4
             6.3.  Protatek shall indemnify and hold harmless PENN against any
       charge
                   or claim  . . . . . . . . . . . . . . . . . . . . . . . . . 4

        Article 7. Infringement by Others: Protection of Patents   . . . . . . 4
             7.1.  Protatek shall promptly inform PENN   . . . . . . . . . . . 4
             7.2.  Protatek and PENN shall consider whether and in what manner
                   litigation  . . . . . . . . . . . . . . . . . . . . . . . . 5

         Article 8. Commercial Application, Sublicenses  . . . . . . . . . . . 5
             8.1.  Any sublicense granted by Protatek  . . . . . . . . . . . . 5
             8.2.  Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee  . . . . . . . . .6
<PAGE>
         Article 9. Term and Termination   . . . . . . . . . . . . . . .  6
              9.1.  The word "Termination"   . . . . . . . . . . . . . .  6
              9.2.  If Protatek shall at any time default in the payment   
                                                                          6
              9.3.  Protatek shall have the right to Terminate this License
         Agreement in
                    respect to any or all Licensed Patents,  . . . . . .  6

         Article 10. Assignment  . . . . . . . . . . . . . . . . . . . .   7

         Article 11. Applicable Law  . . . . . . . . . . . . . . . . . .   7

         Article 12. Arbitration   . . . . . . . . . . . . . . . . . . .   7

         Article 13. Notices   . . . . . . . . . . . . . . . . . . . . .   7

         Article 14. Waiver  . . . . . . . . . . . . . . . . . . . . . .   8

         Article 15. Scope of the Agreement and Integration  . . . . . .   8

               IN WITNESS WHEREOF  . . . . . . . . . . . . . . . . . . .   9
<PAGE>
             This Agreement is by and between The  Trustees of The University of
         Pennsylvania, a non-profit corporation  with offices at 133 South  36th
         Street,  Philadelphia, PA 19104 (PENN), and Protatek International, Inc
         with   Offices  at  1245  Energy  Park  Drive,  Minneapolis,  MN  55108
         (Protatek).

             Whereas, PENN has discovered human genetic material encoding for
         certain peptides which function as inhibitors of proteases; and

             Whereas,  Protatek  has  certain  proprietary  know-how  and  trade
         secrets essential to the production, purification and  characterization
         of biological materials important  to the future exploitation  of these
         protease inhibitors; and

             Whereas, PENN  and Protatek  have executed  a Cooperative  Research
         Agreement,  specifying the  terms and  conditions for  research in  the
         development of such peptides into useful and valuable products; and

             Whereas,  under the terms  of such Cooperative  Research Agreement,
         PENN and  Protatek have agreed  to certain apportionment of  rights and
         responsibilities and the conditions of cooperation  in the research and
         commercial development of such research results, if any; and

             Whereas, Protatek has supported, in part, the research which has
         lead to the results the commercialization of which is contemplated by
         this Agreement; and

             Whereas, PENN wishes to develop and commercially exploit, for the
         good of mankind, the results of such research; and

             Whereas, PENN desires to see that the results of its research are
         expeditiously and competently developed for the good of mankind;

         Now Therefore, be it agreed among the parties as follows:

         Article 1. Definitions
                   1.1. Licensed  Technology means  all inventions,  designs and
                        technology related to  alpha-1 Anti-Chymotrypsin encoded
                        for  by human  DNA and  discovered by  Dr.  Harvey Rubin
                        and/or  his  coworkers  at  PENN  whether   patented  or
                        unpatented, including  all know-how for  practicing such
                        inventions  and technology related to such alpha-1 Anti-
                        Chymotrypsin   including    inventions,   designs    and
                        technology  relating to the active site of said protease
                        inhibitor, its analogues,  and their formulation(s)  and
                        applications.

                1.2.  Licensed Patent means United States letters patent or
         applications therefore and any corresponding foreign (to the United 
         States) applications and foreign patents which have issued or may 
         issue as a result of corresponding foreign patent application and 
         any continuation, continuation-in-part, division, reissue or 
         substitute applications based on any of the foregoing within the 
         Licensed Technology unless and until such patent or application 
         has been abandoned,
                                                1
<PAGE>
                   has lapsed or has been ruled to be wholly invalid by a court
                   of competent jurisdiction.

               1.3. Ultimate Consumer means that person or entity whose use of
         the product results in its destruction or loss of activity and/or loss
         of value.

               1.4. Licensed Product(s) means materials (including expression
         systems) which in the course of manufacture, use or sale would, in the 
         absence of this license, be covered by one or more claims of Licensed 
         Patent which have not been held invalid by a court from which no 
         appeal may be taken.

              1.5. Net  Sales means  the  gross  sales,  received  by  Protatek,
                   whether  invoiced  or  not,  less:  returns  and   allowances
                   actually granted; packing,  insurance, freight out,  taxes or
                   excise  duties imposed  on  the  transaction  (if  separately
                   invoiced); wholesaler discounts; and cash discounts.

               1.6. Protatek is understood to include all of its Affiliates. An
         Affiliate of Protatek shall mean any corporation or other business 
         entity controlled by, controlling, or under common control with 
         Protatek. For this purpose, "control" means direct or indirect 
         beneficial ownership of at least fifty percent (50%) interest
         in the income of such corporation or other business.

         Article 2. Grant

               2.1. PENN grants to Protatek a world-wide exclusive, right and
         license to make, have made, use and sell Licensed Products under 
         Licensed Patent. Such right and license shall include the right to 
         sublicense under terms consistent with this Agreement but without 
         further right to sublicense.

         Article 3. Compliance with Laws, Regulations and Standards

              3.1. Protatek  agrees to  comply with  all  governmental laws  and
                   regulations  applicable to the use, production and/or sale of
                   Licensed Products.

                   With respect  to  operations by  the Protatek  in the  United
                   States,   its    territories   and    possessions,   Protatek
                   specifically expresses its intent to comply with the physical
                   and biological  containment standards  set forth  in the  NIH
                   Guidelines for Research Involving Recombinant DNA  Molecules,
                   dated 21 November 1980, or any subsequent amended version  of
                   U.S. Government guidelines or regulations pertaining to  such
                   activities  in  effect  during the  term  of  this Agreement.
                   Protatek  further   agrees  to   cooperate  with   government
                   agency(ies)  authorized  to   monitor  compliance  with  such
                   containment standards.

         Article 4. Consideration

              4.1. In consideration of the rights granted herein, License shall 
                   pay to PENN certain amounts which have been agreed to in 
                   principle and will be embodied
                                              2
<PAGE>
                   in a separate writing between  the parties. Such amounts  may
                   include   consideration    for:   License    initiation   and
                   maintentance, minimum royalties and earned royalties.

              4.2   All amounts due hereunder by Protatek to PENN shall be paid
                    to PENN in United States Dollars and shall be paid and 
                    reported upon in a manner consistent with Article 5 hereof.

         Article 5. Reports, Payments and Accounting

              5.1  Protatek agrees to make written reports to PENN within sixty
                   (60) days of each June 30 and each December 31 during the 
                   term of this License Agreement stating in each such report 
                   the number of units and Net Sales of Licensed Product(s) 
                   upon which consideration is payable pursuant to Article
                   4 hereof for the prior six month period.

              5.2. Protatek also agrees to make a similar written report to PENN
                   within three months after the date of the Termination of 
                   this License Agreement on Licensed Products(s) used, sold, 
                  rented, or leased by Protatek and upon which consideration 
                  is payable hereunder but which were not previously reported.

              5.3. Concurrently  with the making  of each report  required under
                   this Article, Protatek  shall pay to PENN  all considerations
                   due in connection with the transactions so reported.

               5.4. Protatek agrees to keep records showing the manufacture,
                    sales, use, rentals, and leasing of Licensed Products in 
                    sufficient detail to enable the considerations due and 
                    payable hereunder by Protatek to be determined, and
                    further agrees to permit its books and records to be
                    examined from time to time, but not more than once a year, 
                    to the extent necessary to verify reports provided for in 
                    Paragraphs 5.1 and 5.2 of this Article. Such examination is 
                    to be made by an independent, certified accountant 
                    appointed by PENN, with the fees and expenses to be borne 
                    by PENN. Only those considerations due to PENN within the 
                    three year period immediately preceding the start of the 
                    audit and their supporting records, files, and books of 
                    account shall be subject to audit.

         Article 6. Warranties and Indemnities

               6.1. Nothing in this Agreement shall be construed as:

               6.1.1.  A warranty or  representation by PENN  as to the
                       validity or scope of any Licensed Patent;

               6.1.2.  A  warranty  or representation  that  anything
                       made,  used, sold, rented or leased, under any
                       license granted by this  Agreement is or  will
                       be free from infringement  of patents of third
                       parties;
                                            3
<PAGE>
               6.1.3.    An obligation to bring or prosecute actions or suit
                         against third parties for infringement;

               6.1.4.    Conferring   a  right   to   use  in   advertising,
                         publicity, or otherwise any trademark or trade name
                         of either party; or

               6.1.5.    Granting by implication, estoppel, or otherwise any
                         licenses or rights under patents of PENN other than
                         Licensed  Patents,   regardless  of   whether  such
                         patents dominate or are subordinate to any Licensed
                         Patents.
                   The foregoing  notwithstanding, PENN hereby  informs Protatek
                   that  it  knows of  no  patents which  dominate  the Licensed
                   Patents and under which PENN has the right to grant licenses.

               6.2. PENN  makes no representations  and extends no  warranties 
                    of any kind, either expressed or implied. There are no 
                    expressed or implied  warranties of  merchantability 
                    or  fitness for  a particular purpose, or that the 
                    use  of the Licensed Products will  not infringe any 
                    patent, copyright, trademark, or other rights 
                    of any person.
 

               6.3. Protatek shall indemnify and hold harmless PENN against any
                    charge or claim made by a third party on account of the 
                    rights and license which are objects of this License 
                    Agreement. By way of example, but without limitation,

                    PENN shall be indemnified against loss due to charges of
         product liability, medical malpractice and the like which may be 
         levied against PENN on account of licensed sales pursuant to this 
         License Agreement.

         Article 7. Infringement by Others: Protection of Patents

              7.1. Protatek   shall  promptly  inform   PENN  of  any  suspected
                   infringement of  any Licensed Patent  by a third  party. PENN
                   and  Protatek   shall  consult   to   determine  whether   an
                   infringement exists  and how  best to  effect its  abatement.
                   This consultation and  all related consultations shall  be in
                   furtherance  of the community of interest extant between PENN
                   and Protatek as exemplified by this License Agreement.

               7.2. Protatek and PENN shall consider whether and in what manner
                    litigation or other adjudicative procedures may be brought 
                    against an infringer. PENN and Protatek each shall have the 
                    right to institute an action for infringement of a
                    Licensed Patent against such third party in accordance with
                    the following or such other arrangement as the parties may 
                    agree upon:

               7.2.1. If  PENN and  Protatek agree  to  institute a  suit
                      jointly,  the suit shall  be brought in  both their
                      names, the out-of pocket costs thereof shall

                                            4

<PAGE>
                        be borne  equally, and  recoveries, if  any, whether  by
                        judgment, award, decree, or settlement,  shall be shared
                        equally.  Protatek  shall  exercise  control  over  such
                        action  provided, however,  that  PENN  may,  if  it  so
                        desires, be represented by counsel of its own selection,
                        the fees for  which counsel shall be paid  by PENN. PENN
                        shall  have  the  right  to  approve  the  selection  of
                        litigation counsel  and the proposed  litigation budget,
                        which approval shall not unreasonably  be withheld. PENN
                        shall  have the right  to approve any  settlement of the
                        litigation.

                   7.2.2.    In the  absence of  agreement to  institute a  suit
                             jointly,  PENN  may  institute  suit  and,  at  its
                             option, join  Protatek as  a plaintiff.  PENN shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery by way of judgment or settlement. Protatek
                             will cooperate fully in the prosecution of any such
                             suit.

                   7.2.3.    In the  absence of  agreement to  institute a  suit
                             jointly,  and if PENN determines not to institute a
                             suit, Protatek  may  institute suit,  and, and  its
                             option, join  PENN as a  plaintiff. Protatek  shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery  by way  of  judgment,  award, decree,  or
                             settlement   for  past   infringement.  PENN   will
                             cooperate  fully  in the  prosecution  of  any such
                             suit.

                   7.2.4.    Should either  PENN  or Protatek  commence  a  suit
                             under the provisions of this Article and thereafter
                             elect to  abandon the  same, it  shall give  timely
                             notice  to  the  other  party  who  may,  if  it so
                             desires,   continue   prosecution  of   such   suit
                             provided, however, that the sharing of expenses and
                             any  recovery in  such suit  shall  be agreed  upon
                             between PENN and Protatek.

         Article 8. Commercial Application, Sublicenses

              8.1. Any  sublicense  granted  by   Protatek  under  this  License
                   Agreement shall be  consistent with the terms  and conditions
                   of this License  Agreement, except that sublicense  terms and
                   conditions  shall  reflect  that  any  sublicensee shall  not
                   further sublicense.

              8.2. Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee, including the 
                   payment of considerations specified in such sublicenses, 
                   to PENN or its designee, in the event that this License 
                   Agreement is terminated and not promptly reinstated.

         Article 9. Term and Termination

              9.1. The word "Termination" and cognate words, such as "Term" and
         "Terminate," as used in this License Agreement, are to be read, except 
         where the contrary is specifically indicated, as omitting from their 
         effect the  following rights and

                                              5
<PAGE>
                   obligations, all of which survive any Termination to the
                   degree necessary to permit their complete fulfillment or
                   discharge:

                   9.1.1.    Protatek's obligation  to supply a  terminal report
                             as specified in Paragraph 5.2 hereof;

                   9.1.2.    PENN's right  to receive or recover  and Protatek's
                             obligation  to  pay  royalties,  including  minimum
                             royalties, pursuant to Articles 4 and 5 hereof, due
                             or   accruable  for   payment   at  the   time   of
                             Termination;

                   9.1.3.   Protatek's obligation to maintain records and PENN's
                            right to conduct an audit as provided in Article 5 
                            hereof;

                   9.1.4.    Licenses and releases running in favor of customers
                             of  Protatek   and  Protatek's   sublicensees  with
                             respect to Licensed Product(s) sold or  transferred
                             prior to any termination and on which consideration
                             has been paid or is  payable by Protatek to PENN as
                             provided in Articles 4 and 8 hereof;

                   9.1.5.    Any  cause of  action  or  claim  of  either  party
                             hereto,  accrued or to accrue because of any breach
                             or default by the other party; and

                   9.1.6. The provisions of Article 7.

              9.2. If Protatek shall at any time default in the payment of any
                   consideration or in the making of any report hereunder, or 
                   shall commit any material breach of any covenant herein 
                   contained, or shall make any materially false report
                   and shall fail to remedy any such default, breach, or report
                   within ninety (90) days after written notice thereof by 
                   PENN, PENN may, at its option, Terminate this License 
                   Agreement and the licenses herein granted by notice
                   in writing to such effect.

              9.3. Protatek shall have the right to Terminate this License 
                   Agreement in respect to any or all Licensed Patents, upon 
                   giving at least [    ] written notice to PENN of its 
                   intention and desire to terminate.

         Article 10. Assignment
              This  Agreement shall  be binding  upon and  enure to  the parties
              hereto, their successors and asignees, provided, however, that any
              such assignment by  Protatek will require the  written approval of
              PENN. Such approval by  PENN will not  be withheld by PENN  except
              for reason of situations which  might jeopardize the policies, the
              good name of PENN, or its mission.

         Article 11. Applicable Law
              This  License  Agreement  shall  be  construed,  interpreted,  and
              applied  in  accordance  with  the  laws of  the  Commonwealth  of
              Pennsylvania.

                                      6
<PAGE>
         Article 12. Arbitration
              12.1.     Any controversy arising under or related to this License
                        Agreement,  and  any  disputed  claim  by  either  party
                        against   the  other   under  this   License  Agreement,
                        including,  without  limitation,  disputes  relating  to
                        patent  validity  or  infringement shall  be  settled by
                        arbitration,  upon  the  request   of  either  party  in
                        accordance with  the then-prevailing  Patent Arbitration
                        Rules of the American Arbitration  Association (AAA). In
                        the  event  of  such controversy,  the  matter  shall be
                        submitted to one arbitrator knowledgeable in the  field,
                        who has been selected by mutual agreement of the parties
                        hereto or by the AAA if the parties cannot agree.

             12.2.  Any arbitration under Paragraph 13.1 hereof shall be held at
                    Philadelphia, Pennsylvania, or such other place as may be 
                    mutually agreed upon in writing between the parties. 
                   Judgment upon the award rendered by the arbitrator
                    may be entered in any court having jurisdiction thereof.

         Article 13. Notices

             13.1.  All notices, demands, or other writings provided for in this
                    Agreement to be given, made, or sent by either party to the 
                   other, shall be deemed to have been fully given, made, or 
                   sent when done in writing and deposited in the

                    United States mail, first class, postage prepaid, and
         addressed as follows:

                    To PENN:  University of Pennsylvania
                              Office of Research Administration
                              133 South 36th Street
                              Suite 300
                              Philadelphia, Pennsylvania 19104-3246

                        Attention: Associate Director

                   To Protatek: President
                        Protatek International, Inc.     
                        1425 Energy Park Drive 
                        Minneapolis, MN 55108

             13.2.  The address to which any notice, demand, or other writing
                    may be given or made or sent to any party may be changed 
                    upon written notice given by such party as above provided.

         Article 14. Waiver

              The  parties covenant  and agree that,  if either  party hereunder
              fails or  neglects for any reason to take  advantage of any of the
              terms  of this License Agreement providing  for the Termination of
              this License Agreement, or if a party, having the
                                            7
<PAGE>
              right to declare this License Agreement terminated,  shall fail to
              do so,  any such failure or neglect by such  party shall not be or
              be  deemed or be  construed to  be a waiver  of any of  the terms,
              covenants, or  conditions  of this  License  Agreement or  of  the
              performance  thereof. None of the terms, covenants, and conditions
              of  this License  Agreement can  be waived  except by  the written
              consent of the party waiving compliance.

         Article 15. Scope of the Agreement and Integration

         1.5.1.  The article headings herein are for convenience only and in
                 no manner affect the rights and obligations of the parties, 
                 nor shall they be used to interpret the provisions hereof.

         1.5.2.  This License Agreement and the above-identified Cooperative
                 Research '.   Agreement constitute the entire agreement 
                 between the parties pertaining to the subject matter hereof.

             IN WITNESS WHEREOF,  the parties hereto have executed  this License
         Agreement in duplicate  originals by their officers  or representatives
         duly authorized as of the date executed.

      The Trustees of The University            For Protatek International, Inc
             of Pennsylvania 

        /s/                                     /s/ George C. Sambeck
        -----------------------------           -------------------------
               Signed                           Signed 

        President                               Assoc. Dir.
        -----------------------------           -------------------------
               Title                             Title
                                                9/21/88
        -----------------------------           -------------------------
               Date                              Date

                                     8
<PAGE>
         Attachment C: Protatek Cl Esterase License Agreement
<PAGE>
                                License Agreement Between
                    The Trustees of The University of Pennsylvania 
                                         and 
                             Protatek International, Inc. 
                                (C1 Esterase Inhibitor)
<PAGE>
         Table of Contents:
         Article 1. Definitions  . . . . . . . . . . . . . . . . . . . . .  1
              1.1.  Licensed Technology  . . . . . . . . . . . . . . . . .  1
              1.2.  Licensed Patent  . . . . . . . . . . . . . . . . . . .  1
              1.3.  Ultimate Consumer  . . . . . . . . . . . . . . . . . .  2
              1.4.  Licensed Product(s)  . . . . . . . . . . . . . . . . .  2
              1.5.  Net Sales  . . . . . . . . . . . . . . . . . . . . . .  2
              1.6.  Protatek is understood to include all of its 
                      Affiliates . . . . . . . . . . . . . . . . . . . . .  2
         Article 2. Grant  . . . . . . . . . . . . . . . . . . . . . . . .  2
               2.1. PENN grants to Protatek  . . . . . . . . . . . . . . .  2
         Article 3. Compliance with Laws, Regulations and Standards  . . .  2
              3.1.  Protatek agrees to comply with .all governmental   . .  2
              3.2.  With respect to operations by the Protatek   . . . . .  2
         Article 4. Consideration  . . . . . . . . . . . . . . . . . . . .  3
              4.1.  In consideration of the rights granted herein, 
                      License shall pay to PENN certain amounts    . . . .  3
               4.2  All amounts due hereunder  . . . . . . . . . . . . . .  3
         Article 5. Reports, Payments and Accounting   . . . . . . . . . .  3
              5.1.  Protatek agrees to make written reports to PENN  . . .  3
              5.2.  Protatek also agrees to make a similar written 
                      report to PENN within three months after the 
                      date of the Termination  . . . . . . . . . . . . . .  3
              5.3.  Concurrently with the making of each report  . . . . .  3
              5.4.  Protatek agrees to keep records showing the 
                      manufacture, sales, use, rentals, and leasing  . . .  3
         Article 6. Warranties and Indemnities   . . . . . . . . . . . . .  3
               6.1.  Nothing in this Agreement shall be construed  . . . .  3
               6.2.  PENN makes no representations and extends no 
                       warranties . . . . . . . . . . . . . . . . . . . . . 4
               6.3.  Protatek shall indemnify and hold harmless PENN 
                       against any charge or claim  . . . . . . . . . . . . 4
          Article 7. Infringement by Others: Protection of Patents   . . .  4
               7.1.  Protatek shall promptly inform PENN   . . . . . . . .  4
               7.2.  Protatek and PENN shall consider whether and in what 
                       manner litigation  . . . . . . . . .  . . . . . . .  5
           Article 8. Commercial Application, Sublicenses  . . . . . . . .  5
               8.1.  Any sublicense granted by Protatek  . . . . . . . . .  5
               8.2.  Any such sublicense may provide for the transfer 
                       of all rights and obligations of the sublicensee  .  6
<PAGE>
         Article 9. Term and Termination   . . . . . . . . . . . . . . . .  6
              9.1.  The word "Termination"   . . . . . . . . . . . . . . .  6
              9.2.  If Protatek shall at any time default in the payment .  6
              9.3.  Protatek shall have the right to Terminate this 
                      License Agreement in respect to any or all 
                      Licensed Patents,  . . . . . . . . . . . . . . . . .  6
         Article 10. Assignment  ... . . . . . . . . . . . . . . . . . . .  7
         Article 11. Applicable Law  . . . . . . . . . . . . . . . . . . .  7
         Article 12. Arbitration   . . . . . . . . . . . . . . . . . . . .  7
         Article 13. Notices   . . . . . . . . . . . . . . . . . . . . . .  7
         Article 14. Waiver  . . . . . . . . . . . . . . . . . . . . . . .  8
         Article 15. Scope of the Agreement and Integration  . . . . . . .  8
               IN WITNESS WHEREOF  . . . . . . . . . . . . . . . . . . . .  9
<PAGE>
             This Agreement is by and between The  Trustees of The University of
         Pennsylvania, a non-profit corporation  with offices at 133 South  361h
         Street,  Philadelphia, PA 19104 (PENN), and Protatek International, Inc
         with   Offices  at  1245  Energy  Park  Drive,  Minneapolis,  MN  55108
         (Protatek).

             Whereas, PENN has discovered human genetic material encoding for
         certain peptides which function as inhibitors of proteases; and

             Whereas,  Protatek  has  certain  proprietary  know-how  and  trade
         secrets essential to the production, purification and  characterization
         of biological materials important  to the future exploitation  of these
         protease inhibitors; and

             Whereas, PENN  and Protatek  have executed  a Cooperative  Research
         Agreement,  specifying the  terms and  conditions for  research in  the
         development of such peptides into useful and valuable products; and

             Whereas,  under the terms  of such Cooperative  Research Agreement,
         PENN and  Protatek have agreed  to certain apportionment of  rights and
         responsibilities and the conditions of cooperation  in the research and
         commercial development of such research results, if any; and

             Whereas, Protatek has supported, in part, the research which has
         lead to the results the commercialization of which is contemplated by
         this Agreement; and

             Whereas, PENN wishes to develop and commercially exploit, for the
         good of mankind, the results of such research; and

             Whereas, PENN desires to see that the results of its research are
         expeditiously and competently developed for the good of mankind;

         Now Therefore, be it agreed among the parties as follows:

         Article 1. Definitions
                   1.1. Licensed  Technology means  all inventions,  designs and
                        technology related to C1  Esterase Inhibitor encoded for
                        by  human DNA and discovered  by Dr. Harvey Rubin and/or
                        his coworkers  at   PENN  whether   patented  or
                        unpatented, including  all know-how for  practicing such
                        inventions  and technology  related to such  C1 Esterase
                        Inhibitor including  inventions, designs  and technology
                        relating  to the active site of said protease inhibitor,
                        its    analogues,   and    their   formulation(s)    and
                        applications.

                1.2.  Licensed Patent means United States letters patent or
         applications therefore and any corresponding foreign (to the United 
         States) applications and foreign patents which have issued or may 
         issue as a result of corresponding foreign patent application and 
         any continuation, continuation-in-part, division, reissue
         or substitute applications based on any of the foregoing within
         the Licensed Technology unless and until such patent or application 
         has been abandoned,
                                                1
<PAGE>
                   has lapsed or has been ruled to be wholly invalid by a court
                   of competent jurisdiction.

              1.3. Ultimate Consumer means that person or entity whose use of
         the product results in its destruction or loss of activity and/or loss 
         of value.

              1.4. Licensed Product(s) means materials (including expression
         systems) which in the course of manufacture, use or sale would, in the 
        absence of this license, be covered by one or more claims of Licensed 
        Patent which have not been held invalid by a court from which no appeal 
        may be taken.

              1.5. Net  Sales means  the  gross  sales,  received  by  Protatek,
                   whether  invoiced  or  not,  less:  returns  and   allowances
                   actually granted; packing,  insurance, freight out,  taxes or
                   excise  duties imposed  on  the  transaction  (if  separately
                   invoiced); wholesaler discounts; and cash discounts.

               1.6. Protatek is understood to include all of its Affiliates. An
         Affiliate of Protatek shall mean any corporation or other business 
         entity controlled by, controlling, or under common control with 
         Protatek. For this purpose, "control" means direct or indirect 
         beneficial ownership of at least fifty percent (50%) interest
         in the income of such corporation or other business.

         Article 2. Grant

               2.1. PENN grants to Protatek a world-wide exclusive, right and
         license to make, have made, use and sell Licensed Products under 
         Licensed Patent. Such right and license shall include the right to 
         sublicense under terms consistent with this Agreement but without 
         further right to sublicense.

         Article 3. Compliance with Laws, Regulations and Standards

              3.1. Protatek  agrees to  comply with  all  governmental laws  and
                   regulations  applicable to the use, production and/or sale of
                   Licensed Products.

               3.2. With respect to operations by the Protatek in the United
         States, its territories and possessions, Protatek specifically 
         expresses its intent to comply with the physical anti biological 
         containment standards set forth in the NIH Guidelines
         for Research Involving Recombinant DNA Molecules, dated 21
         November 1980, or any subsequent amended version of U.S. Government
         guidelines or regulations pertaining to such activities in effect 
         during the term of this 

                    Agreement. Protatek further agrees to cooperate with
         government agency(ies) authorized to monitor compliance with such 
         containment standards.

         Article 4. Consideration

         4.1. In consideration of the rights granted herein, License shall pay
         to PENN certain amounts which have been agreed to in principle and will
         be embodied
                                               2
<PAGE>
                   in a separate writing between  the parties. Such amounts  may
                   include   consideration    for:   License    initiation   and
                   maintenance, minimum royalties and earned royalties.

             4.2    All amounts due hereunder by Protatek to PENN shall be paid
         to PENN in United States Dollars and shall be paid and reported upon in
         a manner consistent with Article 5 hereof.

         Article 5. Reports, Payments and Accounting

               5.1. Protatek agrees to make written reports to PENN within sixty
         (60) days of each June 30 and each December 31 during the term of this
         License Agreement stating in each such report the number of units
         and Net Sales of Licensed Product(s) upon which consideration is 
         payable pursuant to Article 4 hereof for the prior six month period.

               5.2. Protatek also agrees to make a similar written report to 
         PENN within three months after the date of the Termination of this 
         License Agreement on Licensed Products(s) used, sold, rented, or 
         leased by Protatek and upon which consideration is payable hereunder 
         but which were not previously reported.

              5.3. Concurrently  with the making  of each report  required under
                   this Article, Protatek  shall pay to PENN  all considerations
                   due in connection with the transactions so reported.

               5.4. Protatek agrees to keep records showing the manufacture,
         sales, use, rentals, and leasing of Licensed Products in sufficient 
         detail to  enable the considerations due and payable hereunder by 
         Protatek to be determined, and further agrees to pertnit its books 
         and records to be examined from time to time, but not more than once 
         a year, to the extent necessary to verify reports   provided for in 
         Paragraphs 5.1 and 5.2 of this Article. Such examination is to be 
         made by an independent, certified accountant appointed by PENN, with 
         the fees and expenses to be borne by PENN. 
         Only those considerations due to PENN within the three year period 
         immediately preceding the start of the audit anti their supporting 
         records, files, and books of account shall be subject to audit.

         Article 6. Warranties and Indemnities

                  6.1. Nothing in this Agreement shall be construed as:

                   6.1.1.    A  warranty or  representation by  PENN  as to  the
                             validity or scope of any Licensed Patent;

                   6.1.2.    A  warranty  or representation  that  anything
                             made,  used, sold, rented or leased, under any
                             license granted by this  Agreement is or  will
                             be free from infringement  of patents of third
                             parties;

                                            3
<PAGE>
                   6.1.3.    An obligation to bring or prosecute actions or suit
                             against third parties for infringement;

                   6.1.4.    Conferring   a  right   to   use  in   advertising,
                             publicity, or otherwise any trademark or trade name
                             of either party; or

                   6.1.5.    Granting by implication, estoppel, or otherwise any
                             licenses or rights under patents of PENN other than
                             Licensed  Patents,   regardless  of   whether  such
                             patents dominate or are subordinate to any Licensed
                             Patents.

                   The foregoing  notwithstanding, PENN hereby  informs Protatek
                   that  it  knows of  no  patents which  dominate  the Licensed
                   Patents and under which PENN has the right to grant licenses.

              6.2. PENN  makes no representations  and extends no  warranties of
                   any kind, either expressed or implied. There are no expressed
                   or implied  warranties of  merchantability or  fitness for  a
                   particular purpose, or that the use  of the Licensed Products
                   will  not infringe any patent, copyright, trademark, or other
                   rights of any person.

              6.3. Protatek shall indemnify and hold harmless PENN against any
         charge or claim made by a third party on account of the rights and
         license which are objects of this License Agreement. By way of example,
         but without limitation,

                   PENN shall be indemnified against loss due to charges of
         product liability, medical malpractice and the like which may be 
         levied against PENN on account of licensed sales pursuant to this 
          License Agreement.

         Article 7. Infringement by Others: Protection of Patents

              7.1. Protatek  shall  promptly   inform  PENN  of  any   suspected
                   infringement  of any Licensed  Patent by a  third party. PENN
                   and   Protatek  shall   consult   to  determine   whether  an
                   infringement exists  and how  best to  effect its  abatement.
                   This consultation and  all related consultations shall  be in
                   furtherance  of the community of interest extant between PENN
                   and Protatek as exemplified by this License Agreement.

               7.2. Protatek and PENN shall consider whether and in what manner
                    litigation or other adjudicative procedures may be brought 
                    against an infringer. PENN and Protatek each shall have the 
                    right to institute an action for infringement of a
                    Licensed Patent against such third party in accordance with
                    the following or such other arrangement as the parties may 
                    agree upon:

                   7.2.1.    If  PENN and Protatek agreement to institute a suit
                             jointly,  the suit shall  be brought in  both their
                             names, the out-of pocket costs thereof shall
                                            4
<PAGE>
                        be borne  equally, and  recoveries, if  any, whether  by
                        judgment, award, decree, or settlement,  shall be shared
                        equally.  Protatek  shall  exercise  control  over  such
                        action  provided, however,  that  PENN  may,  if  it  so
                        desires, be represented by counsel of its own selection,
                        the fees for  which counsel shall be paid  by PENN. PENN
                        shall  have  the  right  to  approve  the  selection  of
                        litigation counsel  and the proposed  litigation budget,
                        which approval shall not unreasonably  be withheld. PENN
                        shall  have the right  to approve any  settlement of the
                        litigation.

                   7.2.2.    In the  absence of  agreement to  institute a  suit
                             jointly,  PENN  may  institute  suit  and,  at  its
                             option, join  Protatek as  a plaintiff.  PENN shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery by way of judgment or settlement. Protatek
                             will cooperate fully in the prosecution of any such
                             suit.

                   7.2.3.    In the  absence of  agreement to  institute a  suit
                             jointly,  and if PENN determines not to institute a
                             suit, Protatek  may  institute suit,  and, and  its
                             option, join  PENN as a  plaintiff. Protatek  shall
                             bear the entire  cost of such litigation  and shall
                             be  entitled to  retain the  entire  amount of  any
                             recovery  by way  of  judgment,  award, decree,  or
                             settlement   for  past   infringement.  PENN   will
                             cooperate  fully  in the  prosecution  of  any such
                             suit.

                   7.2.4.    Should either  PENN  or Protatek  commence  a  suit
                             under the provisions of this Article and thereafter
                             elect to  abandon the  same, it  shall give  timely
                             notice  to  the  other  party  who  may,  if  it so
                             desires,   continue   prosecution  of   such   suit
                             provided, however, that the sharing of expenses and
                             any  recovery in  such suit  shall  be agreed  upon
                             between PENN and Protatek.

         Article 8. Commercial Application, Sublicenses

              8.1. Any  sublicense  granted  by   Protatek  under  this  License
                   Agreement shall be  consistent with the terms  and conditions
                   of this License  Agreement, except that sublicense  terms and
                   conditions  shall  reflect  that  any  sublicensee shall  not
                   further sublicense.

              8.2. Any such sublicense may provide for the transfer of all
                   rights and obligations of the sublicensee, including the 
                   payment of considerations specified in such sublicenses, 
                   to PENN or its designee, in the event that this License 
                   Agreement is terminated and not promptly reinstated.

         Article 9. Term and Termination

              9.1. The word "Termination" and cognate words, such as "Term" and
         "Terminate," as used in this License Agreement, are to be read, except 
         where the contrary is specifically indicated, as omitting from their 
         effect the  following rights and

                                              5
<PAGE>
                   obligations, all of which survive any Termination to the
                   degree necessary to permit their complete fulfillment or
                   discharge:

                   9.1.1.    Protatek's obligation  to supply a  terminal report
                             as specified in Paragraph 5.2 hereof;

                   9.1.2.    PENN's right  to receive or recover  and Protatek's
                             obligation  to  pay  royalties,  including  minimum
                             royalties, pursuant to Articles 4 and 5 hereof, due
                             or   accruable  for   payment   at  the   time   of
                             Termination;

                   9.1.3.   Protatek's obligation to maintain records and PENN's
                            right to conduct an audit as provided in Article 5 
                            hereof;

                   9.1.4.    Licenses and releases running in favor of customers
                             of  Protatek   and  Protatek's   sublicensees  with
                             respect to Licensed Product(s) sold or  transferred
                             prior to any termination and on which consideration
                             has been paid or is  payable by Protatek to PENN as
                             provided in Articles 4 and 8 hereof;

                   9.1.5.    Any  cause of  action  or  claim  of  either  party
                             hereto,  accrued or to accrue because of any breach
                             or default by the other party; and

                   9.1.6. The provisions of Article 7.

              9.2. If Protatek shall at any time default in the payment of any
                   consideration or in the making of any report hereunder, or 
                   shall commit any material breach of any covenant herein 
                   contained, or shall make any materially false report
                   and shall fail to remedy any such default, breach, or report
                   within ninety (90) days after written notice thereof by 
                   PENN, PENN may, at its option, Terminate this License 
                   Agreement and the licenses herein granted by notice
                   in writing to such effect.

              9.3. Protatek shall have the right to Terminate this License 
                   Agreement in respect to any or all Licensed Patents, upon 
                   giving at least [    ] written notice to PENN of its 
                   intention and desire to terminate.

         Article 10. Assignment
              This  Agreement shall  be binding  upon and  enure to  the parties
              hereto, their successors and asignees, provided, however, that any
              such assignment by  Protatek will require the  written approval of
              PENN. Such approval by  PENN will not  be withheld by PENN  except
              for reason of situations which  might jeopardize the policies, the
              good name of PENN, or its mission.

         Article 11. Applicable Law
              This  License  Agreement  shall  be  construed,  interpreted,  and
              applied  in  accordance  with  the  laws of  the  Commonwealth  of
              Pennsylvania.

                                      6
<PAGE>
         Article 12. Arbitration
              12.1.     Any controversy arising under or related to this License
                        Agreement,  and  any  disputed  claim  by  either  party
                        against   the  other   under  this   License  Agreement,
                        including,  without  limitation,  disputes  relating  to
                        patent  validity  or  infringement shall  be  settled by
                        arbitration,  upon  the  request   of  either  party  in
                        accordance with  the then-prevailing  Patent Arbitration
                        Rules of the American Arbitration  Association (AAA). In
                        the  event  of  such controversy,  the  matter  shall be
                        submitted to one arbitrator knowledgeable in the  field,
                        who has been selected by mutual agreement of the parties
                        hereto or by the AAA if the parties cannot agree.

              12.2.     Any  arbitration under  Paragraph 13.1  hereof shall  be
                        held at Philadelphia, Pennsylvania, or  such other place
                        as may  be mutually agreed  upon in writing  between the
                        parties.  Judgment  upon  the  award  rendered  by   the
                        arbitrator  may   be  entered   in   any  court   having
                        jurisdiction thereof.

         Article 13. Notices

              13.1.     All  notices, demands, or other writings provided for in
                        this  Agreement to  be given,  made, or  sent by  either
                        party to the  other, shall be deemed to  have been fully
                        given, made, or  sent when done in writing and deposited
                        in the United States mail, first class, postage prepaid,
                        and addressed as follows:

                    To PENN:   University of Pennsylvania
                               Office of Research Administration
                               133 South 36th Street
                               Suite 300
                               Philadelphia, Pennsylvania 19104-3246

                        Attention: Associate Director

                   To Protatek: President
                               Protatek International, Inc.
                               1425 Energy Park Drive 
                               Minneapolis, MN 55108

              13.2.  The address to which any notice, demand, or other writing
         may be given or made or sent to any party may be changed upon written
         notice given by such party as above provided.

         Article 14. Waiver

              The parties  covenant and  agree that, if  either party  hereunder
              fails or neglects for any reason  to take advantage of any of  the
              terms of this  License Agreement providing  For the Termination  o
              this License Agreement, or if a party, having the
                                            7
<PAGE>
              right to declare this License Agreement terminated,  shall fail to
              do so,  any such failure or neglect by such  party shall not be or
              be  deemed or be  construed to  be a waiver  of any of  the terms,
              covenants, or  conditions  of this  License  Agreement or  of  the
              performance  thereof. None of the terms, covenants, and conditions
              of  this License  Agreement can  be waived  except by  the written
              consent of the party waiving compliance.

         Article 15. Scope of the Agreement and Integration

              15.1.     The article headings herein are for convenience only and
                        in no manner  affect the rights  and obligations of  the
                        parties,  nor  shall  they  be  used  to  interpret  the
                        provisions hereof.

              15.2.     This   License   Agreement  and   the   above-identified
                        Cooperative  Research  Agreement constitute  the  entire
                        agreement between the parties pertaining to the  subject
                        matter hereof.

             IN WITNESS WHEREOF, the  parties hereto have executed  this License
         Agreement in duplicate  originals by their officers  or representatives
         duly authorized as of the date executed.

      The Trustees of The University            For Protatek International, Inc
             of Pennsylvania 

        /s/                                     /s/ George C. Sambeck
        -----------------------------           -------------------------
               Signed                           Signed 

        President                               Assoc. Dir.
        -----------------------------           -------------------------
               Title                             Title
                                                9/21/88
        -----------------------------           -------------------------
               Date                              Date

                                    8
<PAGE>
         Attachment D: Protatek-PIRC-Penn Assignment Agreement
                             of 9/6/91
<PAGE>
                       PI Research Corporation 
                       Assignment Agreement
                       --------------------
             THIS AGREEMENT is entered into as of September 6, 1991, between PI
         Research Corporation, a Delaware Corporation having a place of business
         at One Bush Street, San Francisco, California 94104 (hereinafter
         referred to as the "Company"), Protatek International, Inc., a
         Minnesota corporation, having a place of business at 1491 Energy Park
         Drive, St. Paul, Minnesota 55108 (hereinafter referred to as
         "Protatek"), the Trustees of the University of Pennsylvania, with
         offices at 133 South 36th Street, Philadelphia, Pennsylvania 19104
         (hereinafter referred to as the "University").
             WHEREAS, the Company desires to acquire certain rights to
         technology currently held by Protatek by virtue of certain research and
         license agreements that have previously been entered into with the
         University; and
             WHEREAS, Protatek is willing to assign its rights under such
         research and license agreements to the Company in exchange for equity
         in the Company; and
             WHEREAS, the University desires to consent to such assignment in
         exchange for equity in the Company;
             NOW THEREFORE, for and in consideration of the mutual covenants and
         obligations assumed by the parties hereto, it is agreed as follows:
              1. Assignment
                 ----------
             Effective as of the date of this Agreement, Protatek hereby assigns
         to the Company all right, title and interest that Protatek holds as a
         party to the following research and license agreements (collectively,
         the Assigned Agreements"):
             A.    Cooperative Research Agreement between the University and
         Protatek dated August 1, 1988;
             B.    License Agreement between the University and Protatek dated
         September 27, 1988, for C1 Esterase Inhibitor; and
<PAGE>
                    C.    License Agreement between the University and
                                                                -
         Protatek dated September 27, 1988, for alpha-1 Antichymotrypsin.
             This assignment by Protatek includes the assignment of any and all
         rights that Protatek may have to any discoveries, technology or
         inventions related to the subject matter of the Assigned Agreements,
         including any and all technology derived during the performance of
         Protatek's obligations under the Assigned Agreements.
              2. Consideration.

             A. To Protatek. In exchange for the foregoing assignment, the
         Company will issue to Protatek an aggregate of 1,098,039 shares of the
         Company's Common Stock which shares will initially represent twenty-
         eight percent (28%) of the total capital stock of the Company
         outstanding or reserved for initial issuance. Such Common Stock will be
         issued pursuant to a separate Stock Purchase Agreement in customary
         form to be executed by the parties as soon as reasonably possible, and
         certificates representing such shares of Common Stock will be delivered
         to Protatek promptly after the execution of such Stock Purchase
         Agreement.

             B.    To the University and Certain University Faculty. In exchange
         for its consent to the foregoing assignment, the Company will issue to
         the University and provide an opportunity to purchase for certain
         faculty of the University, an [    ] aggregate shares shall of the 
         Company's Common Stock, which shares will initially represent [    ]
         of the total capital stock of the Company outstanding or reserved for
         initial issuance. Specifically, the aforesaid aggregate shares shall be
         distributed directly to the University and certain faculty of the
         University as follows:

                   1.    To the University, [    ] shares, comprising
         [    ] of the total capital stock of  the Company outstanding or 
         reserved for initial issuance;

             2.    To Dr. Harvey Rubin, Assistant Professor of Medicine, the
         opportunity to purchase [    ] shares, comprising [    ] of the total 
         capital stock of the Company outstanding or reserved for initial 
         issuance;

             3.    To Dr. Barry Cooperman, Professor of Chemistry, the
         opportunity to purchase [    ] shares shall, comprising [    ] of the
         total capital stock of the Company outstanding or reserved for initial
         issuance;

                                          2
<PAGE>
                   4.    To Dr. Norman Schechter, Research Professor
         of Dermatology, the opportunity to purchase [    ] shares
         comprising [        ] of the total capital stock of the Company 
         outstanding or reserved for initial issuance; and

             5.    To Dr. Zhai-Mei Wang, Research Associate for Infectious
         Diseases, the opportunity to purchase [    ] shares comprising [    ]
         of total capital stock of the Company outstanding or reserved for 
         initial issuance.

         Such Common Stock will be issued pursuant to separate Stock Purchase
         Agreements in customary form to be executed by the parties as soon as
         reasonably possible, and certificates representing such shares of
         Common Stock or the opportunity to purchase such Common Stock will be
         delivered to the University and the faculty identified above,
         respectively, promptly after the execution of such Stock Purchase
         Agreements.

             In further consideration to the University, Company and
        University agree to renegotiate in good faith a revised License 
        Agreement for alpha-1 Antichotrypsin and C-1 Esterase Inhibitor to 
        substitute for the Agreements referenced in Paragraphs 1.B and 1.C, 
        and a Collaborative Research Agreement to substitute for the 
        agreement referenced in Paragraph 1.A.

             Protatek and the UniVersity hereby agree to execute such documents
         as are reasonably necessary in the opinion of counsel to the Company to
         permit the Company lawfully to convey the appropriate equity of the
         Company to Protatek and the University, respectively. Protatek and the
         University acknowledge and agree that the shares o~ Colon Stock issued
         to them will be subject to substantial restrictions on transfer and are
         being acquired solely for investment purposes.

              3.    Acceptance and Consent of Assiqnments.
                    -------------------------------------

             The Company hereby accepts the foregoing assignment by Protatek and
         agrees to be bound to all of the provisions therein and to convey the
         consideration described above to each party. The University hereby
         consents to the assignment of the Assigned Agreement to the Company,
         including any rights that may have arisen during the course of
         Protatek's performance under the Assigned Agreements.

              4.    Miscellaneous Provisions.
                    ------------------------

             This Agreement shall be governed for all purposes by the law of the
         State of Delaware as it applies to contracts

                                    3
<PAGE>
         between Delaware residents, made and to be performed entirely within
         the State of Delaware.

             IN WITNESS WHEREOF, the parties hereto have executed this Agreement
         as of the day and year first above written.

         PI RESEARCH CORPORATION        PROT~~NTE~A~ONAL, INC. A .              
               

          /s/ Robert J. Runze         /s/ Roger Headrick
         ------------------------    ----------------------------
         Robert J.Kunze,President    Roger Headrick, President




         THE TRUSTEES OF THE UNIVERSITY
         OF PENNSYLVANIA


         /s/  Stephen M. Sammut
         -----------------------------
         Stephen M. Sammut, Director
         Center for Transfer Technology



                                   4



<PAGE>
                 Attachment F: PIRC/Penn Collaborative Research Agreement
                                           of 3/1/91
<PAGE>
                                     Signature Version

                             COLLABORATIVE RESEARCH AGREEMENT
                             --------------------------------

              This COLIABORATIVE RESEARCH AGREEMENT is made as of the First day
          of March, 1991 by and between THE TRUSTEES OF THE UNIVERSITY OF
          PENNSYLVANIA, a nonprofit corporation organized and existing under the
          laws of the Commonwealth of Pennsylvania (the "University"), and PI
          Research Corporation, a corporation organized and existing under the
          laws of Delaware ("Sponsor").

                                         RECITALS
                                         --------

              A. Dr. Harvey Rubin, a faculty member and Assistant Professor of
          Medicine of the University, has performed research in the field of
          human protease inhibitors under a cooperative research agreement,
          dated October 1, 1987, with Protatek International, Inc.("Protatek"),
          a company then based in Minneapolis, MN.

              B. University entered into two license agreements with University
          for inventions made under the cooperative research agreement.

              C. Protatek contemplates assigning its rights under the
          cooperative research agreement and the two license agreements to
          Sponsor.

              D.  University and Sponsor contemplate entering into a revised
          license agreement ("License Agreement"), which will replace the two
          previous license agreements referred to in recital C above.

              E. Sponsor has undertaken and fulfilled the obligations of
          Protatek to University under the October 1, 1987 Cooperative Research
          Agreement, which has terminated.

              F. Sponsor desires to support and collaborate on additional
          research with Dr. Rubin, such research to be performed in accordance
          with the terms and conditions of this Agreement.

              G. Sponsor further desires to obtain an option to license certain
          of the results of the research performed collaboratively under this
          Agreement on terms substantially similar to those contained in the
          License Agreement.

              H. The research and development program contemplated by this
          Agreement is of mutual interest to Sponsor and the University and
          furthers the educational, scholarship and research objectives of the
          University as a nonprofit, tax-exempt educational institution.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              2

              NOW, THEREFORE, in consideration of the premises and mutual
          covenants contained herein, and intending to be legally bound hereby,
          the parties hereto agree as follows:

                                  ARTICLE 1: DEFINITIONS

              1.1 The following terms as used herein shall have the following
          meanings:

          1.1.1 "Confidential Information, means (i) the University Inventions,
                -------------------------
          (ii) the Joint Inventions, (iii) Sponsor Inventions, (iv) any
          information or material in tangible form that is marked as
          confidential or proprietary by the furnishing party at the time it is
          delivered to the receiving party, and (v) information that is
          furnished orally if the furnishing party identifies such information
          as confidential or proprietary when it is disclosed and promptly
          confirms such designation in writing within 30 days after such
          disclosure.

              1.1.2 "Collaborative Research" means the research and development
                    -----------------------
          program related to human protease inhibitors, as more fully described
          in Attachment 1 to this Agreement, as such may be modified by mutual
          agreement of the parties in writing.

              1.1.3 "Effective Date" of this Agreement is March 1, 1991.
                      ---------------

              1.1.4 "Inventions" mean and include all technical information,
                    -----------
          trade secrets, developments, discoveries, know-how, methods,
          techniques, formulae, processes and other proprietary ideas, whether
          or not patentable or copyrightable, that are discovered, developed or
          reduced to practice in the performance of the Collaborative Research.

              1.1.5 "Joint Inventions" mean Inventions made or conceived jointly
                    -----------------
          by employees of the University and Sponsor.

              1.1.6 "Principal Investigators" mean the individuals designated in
                    ------------------------
          accordance with Section 92.3 hereof.

              1.1.7 "Research Inventions" mean the Joint Inventions, Sponsor
                     -------------------
          Inventions and University Inventions.

              1.1.8 "Sponsor Inventions" mean Inventions made or conceived
                     ------------------
               solely by employees of Sponsor.

              1.1.9 "University Inventions" mean Inventions made or
                    ----------------------
               conceived solely by employees of the University.

                   1.1.10 ~University Principal Investigator" or "University
                          ---------------------------------     -----------
               Investigators" refers respectively to the Principal Investigator,
               -------------
               Harvey Rubin, M.D., Ph.D., Assistant Professor of Medicine at
               University, and to Investigators, Barry S. Cooperman, Ph.D.,
               Professor of Chemistry, Norman Schechter, Ph.D., Research
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              3

          Professor of Dermatology and Zai-Mei Wang, Ph.D., Research Associate
          Infectious Diseases, all at University.

                               ARTICLE 2: SPONSORED RESEARCH

              2.1 Statement of Work. The parties hereto agree to use reasonable
                  -----------------
          efforts to conduct the Collaborative Research with funds made
          available by Sponsor. Each party shall furnish the appropriate
          personnel, materials, services, facilities and equipment for the
          performance of the Collaborative Research. The University is under no
          obligation to fund any of the Collaborative Research.

              2.2 Conduct and Supervision of Collaborative Research. The parties
                  -------------------------------------------------
          shall cooperate fully in the conduct and supervision of the
          Collaborative Research. Each party acknowledges that the other makes
          no express or implied warranties, representations or guarantees with
          respect to the completion, success or particular results of the
          Collaborative Research.

               2.3 Participation of Principal Investigators.
                   ----------------------------------------

              2.3.1 Dr. Harvey Rubin, an employee of University, and an employee
          of Sponsor to be designated in the future who shall be acceptable to
          University, shall serve as Principal Investigators for the
          Collaborative Research and shall be responsible for the administration
          and supervision of the Collaborative Research. The Principal
          Investigators shall meet at reasonable intervals, in mutually
          convenient locations to review the findings and the progress of the
          Collaborative Research.

              2.3.2 If the services of a Principal Investigator become
          unavailable to a party for any reason, that party shall be entitled to
          designate another member of its staff or faculty who is acceptable to
          both parties to serve as a Principal Investigator of the Collaborative
          Research. If a substitute Principal Investigator has not been
          designated within sixty (60) days after an original Principal
          Investigator ceases his or her services under this Agreement, either
          party may terminate this Agreement upon written notice thereof to the
          other party.

               2.4 Access to Facilities
                   --------------------

              Each party shall permit visits and inspections to its facilities,
          and observation of the work being performed in connection with the
          Collaborative Research program, by the employees and consultants of
          the other parties engaged in the performance of Collaborative
          Research. All such visiting personnel shall be subject to the health
          and safety regulations of the facility in question, and to the
          execution of appropriate agreements regarding non-disclosure of
          Confidential Information.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              4

                             ARTICLE 3: PERIOD OF PERFORMANCE

              3.1 Period of Performance. The initial term of the Collaborative
                  ---------------------
          Research shall be for [    ] from the Effective Date of this
          Agreement, unless terminated sooner pursuant to Section 7.1
          hereof. This Agreement may be extended or renewed only by written
          agreement of both parties.

                                 ARTICLE 4: FUNDING, ETC.

              4.1 Funding. To support the Collaborative Research of the
                  -------
          University, Sponsor shall pay the University the amounts set forth in
          Attachment 1 hereto for the initial term of the Collaborative 
          Research. Funding amounts for any renewal term shall be determined by
          the parties if and when the determination to renew is made under 
          Article 3 hereof.

              4.2 Payment. Sponsor shall make monthly payments on a pro rata
                  -------
          basis in accordance with Attachment 1 by check made payable to "The
          Trustees of the University of Pennsylvania," mailed to the University
          at the address identified in Section 9.5 hereof.

              4.3 Additional Funds. The total of the payments set forth in
                  ----------------
          Attachment A (the "Payment Ceiling") represents an estimate only and
          not a guarantee of the cost to support the University's research
          Activities during the initial term of the Collaborative Research. The
          University may submit a request to Sponsor for additional funds at
          such time as the University's share of the Collaborative Research
          costs may reasonably be projected to exceed the Payment Ceiling.
          Sponsor shall not be liable for, and the University shall not incur,
          expenditures in excess of the Payment Ceiling unless Sponsor approves
          such additional expenditure in writing and funds such additional
          expenditure in advance. The University shall not be required to
          complete the Collaborative Research in the event that (i) the Payment
          Ceiling proves insufficient for that purpose, and (ii) Sponsor
          determines not to increase the Payment Ceiling to an amount adequate
          to complete the Collaborative Research. Any amounts paid by Sponsor
          under this Agreement are nonrefundable, except as provided in Section
          7.2 hereof. Payments made by Sponsor under this Section fulfill the
          diligence obligations of the Licenses under Section3.3(a) of the
          License Agreement.

              4.4 University Record Keeping and Reports to Sponsor. The
                  ------------------------------------------------
          University shall keep accurate records and books of account relating
          to amounts paid to it by Sponsor hereunder, which are to be available
          to authorized representatives of Sponsor upon reasonable written
          notice during the University's regular business hours. The parties
          shall consult and render progress reports to one another quarterly
          during the term of the Collaborative Research and shall render to one
          another a complete final report on the results of the Collaborative
          Research within
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              5

          one hundred twenty (120) days following termination of the
          Collaborative Research.

              4.5 Equipment. Title to any equipment purchased, built or
                  ---------
          manufactured by the University, its Principal Investigator or
          University Investigators in the performance of the Collaborative
          Research shall vest in the University and any such equipment shall be
          and remain the property of the University following termination of the
          Collaborative Research.

                      ARTICLE 5: INVENTIONS, OPTION TO LICENSE, ETC.

              5.1 Disclosure of Inventions. Each party shall provide promptly to
                  ------------------------
          the other a complete written disclosure of any Research Invention
          reasonably considered patentable.

               5.2 Prosecution of Patents.
                   ----------------------

              5.2.1 University Inventions. The University shall be responsible
                    ---------------------
          for and shall control the preparation, prosecution and maintenance of
          all patents and patent applications related to a University Invention.
          Sponsor shall advise the University, no later than thirty (30) days
          after receipt of disclosure of a University Invention whether it
          requests the University to file and prosecute a patent application
          related to such University Invention. Sponsor shall reimburse the
          University for all documented expenses (including legal fees, filing
          and maintenance fees or other governmental charges) incurred in
          connection with the filing, prosecution and maintenance of any patents
          and patent applications that Sponsor requests the University to
          prosecute hereunder. Sponsor and the University shall mutually
          determine the countries where the patents and patent applications
          related to University Inventions will be prosecuted and maintained. If
          Sponsor declines to pay for filing, prosecution and maintenance costs
          in any jurisdiction, the University may do so at its cost and expense
          but such patents and patent applications shall be excluded from
          Sponsor's option to license under Section 5.4 hereof. If the
          University elects not to file, prosecute or maintain any patent or
          patent application related to a University Invention, Sponsor shall
          then have the right to file, prosecute or maintain the patent or
          patent application at its own expense.

              5.2.2 Joint Inventions and Sponsor Inventions. Sponsor shall be
                    ---------------------------------------
          responsible for and shall control, at its own cost, the preparation,
          prosecution and maintenance of all patents and patent applications
          related to a Joint Invention or a Sponsor Invention. Sponsor shall
          advise the University no later than thirty (30) days after disclosure
          of a Joint Invention by either party whether it intends to file and
          prosecute a patent application related to the Joint Invention. If
          Sponsor declines to file and prosecute a patent application for a
          Joint Invention in any jurisdiction, the University may do so at its
          cost and expense but such patent application and patent shall be
          excluded
<PAGE>
          Collaborative Research Agreement between PIRC and Penn             6

          from Sponsor's option to license under Section 5.4 hereof.

              5.2.3 Other Proprietary Rights. The filing and prosecution of
                    ------------------------
          copyright, trademark and other intellectual property protection
          related to the Research Inventions shall be subject to the provisions
          of this Section 5.2.

              5.2.4 Cooperation. Each party shall cooperate with the other party
                    -----------
          to execute all lawful papers and instruments and to make all rightful
          oaths and declarations as may be necessary in the preparation and
          prosecution of all patents and other filings referred to in this
          Article 5.

               5.3 Ownership.
                   ---------

              (a) The University shall retain all right, title and interest in
          and to the University Inventions and any patent applications, patents,
          copyrights and other protection related thereto, regardless of which
          party prepares, prosecutes or maintains the patent applications,
          patents, copyrights or other protection related to the University
          Inventions.

              (b) Sponsor shall retain all right, title and interest in and to
          the Sponsor Inventions and any patent applications, patents,
          copyrights and other protection related thereto.

              (c) Sponsor and the University shall retain all right, title and
          interest in and to the Joint Inventions and each shall have an equal
          undivided partial interest in any such Joint Invention and any
          resulting patent applications, patents, copyrights and other
          protection issued or granted thereon, regardless of which party
          prepares, prosecutes or maintains the patent applications, patents,
          copyrights or other protection related to the Joint Inventions.

              (d) Each party shall maintain policies for its employees or
          agreements with all of its employees assigned to conduct Collaborative
          Research, and all third party contractors engaged in connection with
          the Collaborative Research project, providing for the assignment to
          such party of all rights of such employee, consultant, or contractor
          with respect to inventions made or other technology rights developed
          in the course of such person's employment or other engagement by the
          party which relate to the Collaborative Research.

              5.4 Option to License. In consideration of Sponsor's funding of
                  -----------------
          the Collaborative Research, Sponsor shall have the option to acquire
          an exclusive, worldwide, royalty-bearing license to practice any
          University Invention or Joint Invention and any patents or patent
          applications related thereto and to make, have made, use and sell
          products using or incorporating a University Invention or Joint
          Invention pursuant to the terms of the License Agreement, as
          supplemented or amended by the provisions of Attachment 2 hereto.
          Sponsor's option must be
<PAGE>
          Collaborative Research Agreement between PIRC and Penn             7

          exercised by written notice to the University within three months
          after the disclosure of a University Invention or Joint Invention to
          Sponsor under Section 5.1 hereof. If Sponsor timely exercises its
          option, Sponsor and the University will promptly execute an amendment
          to the License Agreement as to each University Invention or Joint
          Invention for which the Sponsor has exercised its option. If Sponsor
          fails to timely exercise its option, or if Sponsor and the University
          fail to execute an amendment to the License Agreement within nine (9)
          months after disclosure of the University Invention or Joint Invention
          to Sponsor, the University shall be free to license the University
          Invention or Joint Invention to any party upon such terms as the
          University deems appropriate, without any further obligation to
          Sponsor.

              5.5 Retained Rights of U.S. Government. Any license granted to
                  ----------------------------------
          Sponsor pursuant to Section hereof shall be subject to the rights of
          the United States government reserved under Public Laws 96-517, 97-
          256, and 98-620, codified at 35 U.S.C. 200-212, and any regulations
          issued thereunder.

              5.6 Grant of License to Sponsor Technology. Sponsor hereby grants
                  --------------------------------------
          to the University a license, without right of sublicense, to use, but
          not to make, have made or sell and solely for the limited purpose of
          engaging in the Collaborative Research, any trade secrets,
          information, know-how or other proprietary ideas obtained or 
          developed by Sponsor outside of the performance of the Collaborative 
          Research that Sponsor, solely in its discretion, discloses to the 
          University for the purpose of assisting the University in performing 
          the Collaborative Research.

                        ARTICLE 6: CONFIDENTIALITY AND PUBLICATION

              6.1    Confidentiality. Sponsor shall maintain in confidence and
                     ---------------
          shall not disclose to any third party the Confidential Information of
          the University received pursuant to this Agreement, without the prior
          written consent of the University. The foregoing obligation shall not
          apply to:

                         6.1.1.1  information  that  is   known  to  Sponsor  or
                         independently developed by Sponsor prior to the time 
                         of disclosure, in each case, to the extent evidenced by
                         written records promptly disclosed to the University 
                         upon receipt of the Confidential Information;

                         6.1.1.2    information disclosed to Sponsor by a third
                         party that has a right to make such disclosure;
<PAGE>
          Co11aborative Research Agreement between PIRC and Penn              8

                         6.1.1.3    information that becomes patented, published
                         or otherwise part of the public domain as a result of
                         acts by the University or a third person obtaining such
                         information as a matter of right; or

                         6.1.1.4    information that is required to be disclosed
                         by order of the U.S. Food and Drug Administration or
                         similar authority or a court of competent jurisdiction;
                         provided that the parties shall use their best efforts
                         to obtain confidential treatment of such information by
                         the agency or court.

              6.1.2. Sponsor will take all reasonable steps to protect the
          Confidential Information of the University with the same degree of
          care Sponsor uses to protect its own confidential or proprietary
          information. Without limiting the foregoing. Sponsor shall ensure that
          all of its employees having access to the Confidential Information of
          the University are obligated to abide by Sponsor's obligations
          hereunder.

              6.1.3. The University shall not be obligated to accept any
          Confidential Information of Sponsor. If Sponsor desires to furnish any
          such Confidential Information to the Principal Investigator or other
          University personnel, Sponsor may request such individual to sign a
          confidentiality agreement with Sponsor in the form of Attachment 3
          hereto. The University bears no institutional responsibility for
          maintaining the confidentiality of any Confidential Information of
          Sponsor.

               6.2 Publication.
                   -----------

              6.2.1. Sponsor acknowledges that the basic objective of research
          and development activities at the University is the generation of new
          knowledge and its expeditious dissemination. To further that
          objective, the University retains the right, at its discretion, to
          demonstrate, publish or publicize a description of the results of the
          Collaborative Research or any University Invention or Joint Invention,
          subject to the provisions below.

              6.2.2. Should the University desire to disclose publicly, in
          writing or by oral presentation, the results of the Collaborative
          Research or any University Invention or Joint Invention for which a
          patent application has not been filed, the University shall notify
          Sponsor in writing of its intention at least thirty (30) days before
          submission of such material that
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              9

          would make such disclosure. The University shall include with such
          notice a description of the oral presentation or, in the case of a
          manuscript or other proposed written disclosure, a current draft of
          such written disclosure.

              6.2.3. With respect to University Inventions, Sponsor may request
          the University, no later than thirty (30) days following the receipt
          of the University's notice, to file a patent application, copyright or
          other filing related to such University Invention. All such filings
          shall be subject to the provisions of Section 5.2 of this Agreement.
          Upon receipt of such request, the University shall arrange for a short
          delay in publication, not to exceed sixty (60) days, to permit filing
          of a patent or other application by the University, or if the
          University declines to file such application, to permit Sponsor to
          make such a filing. If University receives no such request from
          Licensee to delay submission of material making such disclosure,
          University may submit such material for publication or presentation
          provided that University first confirms in a reasonable way that
          Licensee has received and reviewed material.

              6.2.4. With respect to a Joint Invention, Sponsor may request the
          University, no later than thirty (30) days following the receipt of
          the University's notice, to delay publication for a period not to
          exceed sixty (60) days to permit filing of a patent or other
          application by the Sponsor. All such filings shall be subject to the
          provisions of Section 5.2 of this Agreement.

              6.2.5. If the University desires to demonstrate, publish or
          publicize the results of the Collaborative Research or any University
          Invention of Joint Invention that is not patentable, and Sponsor
          objects to such proposed disclosure within the time period specified
          in Sections 6.2.3 or 6.2.4 above, the parties will negotiate in good
          faith to determine whether the proposed disclosure can be modified or
          withheld, consistent with the objectives of each party. In no event
          shall the University be prohibited from proceeding with any such
          publication.

              6.3. Use of Name. Neither party hereto shall directly or
                   -----------
          indirectly use the name of the other party, or the name of any
          trustee, director, officer or employee thereof, without the others
          written consent.

                                  ARTICLE 7: TERMINATION

               7.1 Termination.
                   -----------

              7.1.1 In addition to the termination right set forth in Section
          2.3.2 hereof, either party may terminate this Agreement effective upon
          written notice to the other party, if the other party breaches the
          terms of this Agreement and fails to cure Such breach within [    ] 
          after receiving notice
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              10

          thereof.

              7.1.2 This Agreement shall automatically terminate if Sponsor
          becomes insolvent or voluntary or involuntary proceedings by or
          against Sponsor are instituted in bankruptcy or under any insolvency
          law, or a receiver or custodian is appointed for Sponsor, or
          proceedings are instituted by or against Sponsor for corporate
          reorganization or the dissolution of Sponsor, which proceeding, if 
          involuntary, shall not have been dismissed within [    ] after the 
          date of filing or Sponsor makes an assignment for benefit of 
          creditors, or substantially all of the assets of Sponsor are 
          seized or attached and not released within [    ] thereafter.

              7.1.3 In addition, either party may terminate this Agreement for
          any reason upon [    ] prior written notice to the other party.

              7.2. Effect of Termination. In the event of termination of this
                   ---------------------
          Agreement prior to its stated term whether for breach or for any other
          reason whatsoever, the University shall be entitled to retain from the
          payments made by Sponsor prior to termination the University's
          reasonable costs of concluding the work in progress. Allowable costs
          include, without limitation, all costs or noncancellable commitments
          incurred prior to the receipt of, or issuance by, the University of
          the notice of termination, and the full cost of each student and
          faculty member supported hereunder through the end of the academic
          semester in which the effective date of termination fails. In the
          event of termination, the University shall submit a final report of
          all costs incurred and all funds received under this Agreement within
          sixty (60) days after the effective termination date. The report shall
          be accompanied by a check in the amount of any excess of funds
          advanced over costs and allowable commitments incurred.

              7.3. Survival. Termination of this Agreement shall not affect the
                   --------
          rights and obligations of the parties accrued prior to termination
          hereof. The provisions of Articles 5, 6, 8 and 9 shall survive such
          termination.

                               ARTICLE 8: DISCLAIMERS, ETC.

              8.1. No Warranties. THE UNIVERSITY MAKES NO WARRANTIES, EXPRESS OR
                   -------------
          IMPLIED, AS TO ANY MATTER WHATSOEVER, INCLUDING, WITHOUT LIMITATION,
          THE CONDUCT OF THE COLLABORATIVE RESEARCH, OR THE CONDITION OF ANY
          INVENTION(S) OR PRODUCT(S), WHETHER TANGIBLE OR INTANGIBLE, CONCEIVED,
          DISCOVERED, OR DEVELOPED UNDER THIS AGREEMENT, OR THE OWNERSHIP,
          MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE OF THE
          COLLABORATIVE RESEARCH OR ANY SUCH INVENTION OR PRODUCT. THE
          UNIVERSITY SHALL NOT BE LIABLE FOR ANY DIRECT, CONSEQUENTIAL, PUNITIVE
          OR OTHER DAMAGES SUFFERED BY SPONSOR OR ANY OTHER PERSON RESULTING
          FROM THE COLLABORATIVE RESEARCH OR THE USE OF ANY SUCH INVENTION OR
          PRODUCT.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              11

              8.2 Indemnity.  The indemnification or reimbursement rights and
                  ---------
          obligations of the parties hereto shall be governed by Sections 6.2
          and 6.3 of the License Agreement.

                                  ARTICLE 9: ADDITIONAL PROVISIONS

               9.1 Arbitration.
                   -----------

              9.1.1 Except as provided in Section 6.4 hereof, all disputes
          arising between the University and Sponsor under this Agreement shall
          be settled by arbitration conducted in the English language in
          accordance with the Commercial Arbitration Rules of the American
          Arbitration Association relating to voluntary arbitrations with a
          panel of three (3) arbitrators. The parties will cooperate with each
          other in causing the arbitration to be held in as efficient and
          expeditious a manner as practicable. Any arbitration proceeding
          instituted under this Agreement shall be brought in Philadelphia,
          Pennsylvania.

              9.1.2 Any award rendered by the arbitrators shall be final and
          binding upon the parties hereto. Judgment upon the award maybe entered
          in any court of record of competent jurisdiction. Each party shall pay
          its own expenses of arbitration and the expenses of the arbitrators
          shall be equally shared unless the arbitrators assess as part of their
          award all or any part of the arbitration expenses of one party
          (including reasonable attorneys' fees) against the other party.

              9.9- Assignment. No rights hereunder may be assigned by Sponsor,
                   ----------
          directly, unless by merger or acquisition of Sponsor, without the
          express written consent of the University; provided, however, that
          Sponsor may assign the same to an Affiliate that assumes all
          obligations of Sponsor under this Agreement or to any entity in
          connection with any merger, acquisition or sale of all or
          substantially all of its business related to this Agreement. Any
          prohibited assignment of this Agreement on the rights hereunder shall
          be null and void. No assignment shall relieve Sponsor of
          responsibility for the performance of any accrued obligations which it
          has prior to such assignment, unless the 'University consents in
          writing to release of such accrued obligations. This Agreement shall
          inure to the benefit of permitted assigns of Sponsor.

              9.3 No Waiver. A waiver by either party of a breach or violation
                  ---------
          of any provision of this Agreement will not constitute or be construed
          as a waiver of any subsequent breach or violation of that provision or
          a waiver of any breach or violation of any other provision of this
          Agreement.

              9.4 Independent Contractor. Nothing herein shall be deemed to
                  ----------------------
          establish relationship of principal and agent between the University
          and Sponsor, nor any of their agents or employees for any purpose
          whatsoever. This Agreement shall not be construed as
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              12

          constituting the University and Sponsor as partners, or as creating
          any other form of legal association or arrangement which would impose
          liability upon one party for the act or failure to act of the other
          party.

              9.5 Notices. Any notice under this Agreement shall be sufficiently
                  -------
          given if-sent in writing by prepaid first class, certified or
          registered mail, return receipt requested, addressed as follows:

               If to the University:

                    Center for Technology Transfer 
                    University of Pennsylvania
                    133 South 36th Street 
                    Philadelphia, PA 19104
                    Attn: Director

               cc: Office of the General Counsel 
                   110 College Hall 
                   University of Pennsylvania 
                   Philadelphia, PA 19104
                   Attn: General Counsel

               cc: Dr. Harvey Rubin 
                   Assistant Professor 
                   Department of Medicine
                   Hospital of the University of Pennsylvania 
                   3400 Spruce Street 
                   Philadelphia, Pa 19104

          If to Sponsor:

                    P I Research Corporation 
                    c/o Mr. Robert Kunze
                    Hambrecht & Quist Life Science Venture Partners 
                    One Bush Street
                    San Francisco, CA 94101
                    Attn:  Chief Executive Officer

          with copy to:
                    Hambrecht & Quist Life Science
                        Venture Partners 
                    One Bush Street
                    San Francisco, CA 94104
                    Attn:   Mr. Robert Kunze

          with copy to:
                    Cooley Godward Castro Huddleson & Tatum 
                    One Maritime Plaza, 20th Floor 
                    San Francisco, CA 94111
                    Attn:  Kenneth L. Guernsey, Esq.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              13

              9.6 Entire Agreement; Changes. This Agreement embodies the entire
                  -------------------------
          understanding between the parties relating to the subject matter
          hereof and supersedes all prior understandings and agreements, whether
          written or oral. This Agreement may not be varied except by a written
          document signed by duly authorized representatives of both parties.

              9.7 Severability. Any of the provisions of this Agreement which
                  ------------
          are determined to be invalid or unenforceable in any jurisdiction
          shall be ineffective to the extent of such invalidity or
          unenforceability in such jurisdiction, without rendering invalid or
          unenforceable the remaining provisions hereof or affecting the
          validity or unenforceability of any of the terms of this Agreement in
          any other jurisdiction.

              9.8 Headings. The headings and captions used in this Agreement are
                  --------
          for convenience of reference only and shall not affect its
          constructions or interpretation.

              9.9 No Third Party Benefits. Nothing in this Agreement, express or
                  -----------------------
          implied, is intended to confer on any person other than the parties of
          their permitted assigns, any benefits, rights or remedies.

              9.10 Governing Law. This Agreement shall be construed and governed
                   -------------
          in accordance with the laws of the State of Delaware, without giving
          effect to conflict of law provisions.

              9.11 Counterparts. This Agreement shall become binding when any
                   ------------
          one or more counterparts hereof, individually or taken together, shall
          bear the signatures of the University and Sponsor. This Agreement may
          be executed in any number of counterparts, each of which shall be
          deemed an original as against the party whose signatures appears
          thereon, but all of which taken together shall constitute but one and
          the same instrument.

              9.12 Independent Research. This Agreement shall not be construed
                   --------------------
          to limit the freedom of individuals participating in the Collaborative
          Research to engage in any other research.

              9.13 Nondiscrimination. The University and Sponsor shall not
                   -----------------
          discriminate against any employee or applicant for employment because
          of race, color, sex, sexual or affectational preference, age,
          religion, national or ethnic origin, or handicap.

              9.14 Force Majeure. Neither party shall be liable for any
                   -------------
          failure to perform as required by this Agreement to the extent
          such failure to perform is due to circumstances reasonably beyond
          such party's control, including, without limitation, labor
          disturbances or labor disputes of any kind, accidents, failure of
          any governmental approval required for full performance, civil
          disorders or commotions, acts of aggression acts of God, energy
          or other conservation measures imposed by law or regulation,
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              14

          explosions, failure  of  utilities,  mechanical  breakdowns,  material
          shortages, disease, or other such occurrences.

              IN WITNESS WHEREOF, the duly authorized representatives of the
          parties hereby execute this Collaborative Research Agreement as of the
          date first above written.

          FOR THE TRUSTEES OF THE        FOR THE SPONSOR
          UNIVERSITY OF PENNSYLVANIA    


          /s/ Stephen M. Sammut          /s/ Robert Kunze 
          --------------------------     --------------------------
             Stephen M. Sammut           Robert Kunze 
            Director, Center for              Chairman
             Technology Transfer

          Agreed to and Acknowledged:


          /s/ Dr. Harvey Rubin           /s/ Dr. Barry Cooperman
          --------------------------     --------------------------
          Dr. Harvey Rubin               Dr. Barry Cooperman
          Principal Investigator.        Investigator


          /s/ Dr. Norman Schechter        /s/ Dr. Zhai-Mei Wang 
          --------------------------     --------------------------
          Dr. Norman Schechter            Dr. Zhai-Mei Wang 
          Investigator                    Investigator
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              15

          Attachment 1

                         Description of the Collaborative Research
                         -----------------------------------------
                                 and Schedule of payments
                                 ------------------------
<PAGE>
          Summary of Proposed Research


   [













                                                                  ]

<PAGE>
                   Collaborative Research Agreement 
          PI Research Corporation/University of Pennsylvania

        Budget for the period March 1, 1991 to February 29, 1992


   [













                                                                  ]


<PAGE>
          Collaborative Research Agreement between PIRC and Penn              16

                                       Attachment 2

                          Additional Terms for License Agreement
                          --------------------------------------

              B.            In the event that Sponsor exercises its option
          under Section 5.4 of the Agreement to obtain an exclusive license in
          or to a University Invention or to the University's undivided interest
          in a Joint Invention (collectively, "Additional Licensed Technology")
          that are not included under the definition of Licensed Patents in the 
          License Agreement and/or are not related to [    ], the
          parties shall execute a written addendum to the License Agreement
          making Additional Licensed Technology subject to all the terms and
          conditions of the License Agreement with the exception that Minimum
          Royalties for Additional Licensed Technology as otherwise described in
          Paragraph 3.4 of the License Agreement shall be administered according
          to the following schedule:

                     Minimum Royalty          Year Beginning
                     ---------------          --------------

                        [    ]                [    ] Anniversary of
                                                     Addendum
                        [    ]                Each Anniversary of Addendum
                                              thereafter

              B. 1.2. University shall not receive an up-front payment or
          additional stock for Additional Licensed Technology. Royalties will be
          paid on Additional Licensed Technology to the extent that such
          Additional Licensed Technologies are incorporated in the sale of
          Licensed Products.
<PAGE>
          Collaborative Research Agreement between PIRC and Penn              17

          Attachment 3

              Form of Confidentiality Agreement
          -------------------------------------
<PAGE>
                                 CONFIDENTIALITY AGREEMENT

             (Acceptable Form Under Paragraph 8.1 (c) of License Agreement and
                   Paragraph 6.1.3 of Collaborative Research Agreement)

              This Agreement is by and between ______________________  an
          employee of the University of Pennsylvania ("the University" located
          in Philadelphia, PA 19104 (hereinafter referred to as"Recipient"); and
          PI Research Corporation, a corporation organized and existing under
          the laws of Delaware (hereinafter referred to as "Company").

                                         RECITALS

              WHEREAS, a License Agreement, dated October 1, 1991 and a
          Collaborative Research Agreement dated March 1, 1991 are in place
          between the University and Company in the field of protease inhibitors
          with Recipient serving as an Investigator or other researcher for the
          University; and

              WHEREAS, Company anticipates conducting research in, or working
          with third parties that are conducting research in, the field of
          protease inhibitors, and may develop or have access to a body of
          technical, economic and business information and/or material samples
          (hereinafter collectively referred to as "Information") which Company
          considers proprietary; and

              WHEREAS, in order for Company to conduct research under the
          Collaborative Research Agreement with University, or for Company to
          facilitate the transfer of technology under the License Agreement, it
          may be necessary for Company to disclose to and/or provide Recipient
          with Information; and

              WHEREAS, the University bears no institutional responsibility to
          receive or maintain in confidence such Information, but will allow
          Recipient to enter this Agreement on an individual basis in connection
          with the Collaborative Research Agreement and the License Agreement;
          and

              WHEREAS, Recipient is willing to accept as an individual
          Information from Company under the terms and conditions set forth
          herein in order to conduct the work contemplated by the Collaborative
          Research Agreement and/or participate in the transfer of technology
          from University to Company under the License Agreement (hereinafter
          collectively referred to as "Program Performance").
<PAGE>
          Confidentiality Agreement                                      Page 2

              NOW, THEREFORE, for and in consideration of the mutual covenants
          contained herein, the parties do agree as follows:

              1.    When Information is clearly marked "Confidential or later
          confirmed in writing to be confidential, Recipient agrees to keep the
          Information in strict confidence and not to disclose or otherwise use
          the Information for any purpose other than Program Performance without
          the prior written consent of Company. Accordingly, Recipient agrees to
          take all reasonable precautions to prevent the unauthorized disclosure
          to any third party of the Information received from Company. Recipient
          agrees to disclose such Information only to University employees and
          solely to those University employees who:

               (a) Recipient knows have entered into a confidentiality agreement
          in the form of this Agreement which was signed by Company and which
          concerns the Information; and

              (b) need to know the Information because they are assisting
          Recipient in the Program Performance.

              2.    The above notwithstanding, Recipient's obligation of
          confidence with respect to the Information disclosed or developed
          hereunder shall not include:

                   (a) Information which, at the time of disclosure to

               Recipient, is published, known publicly or otherwise becomes part
               of the public domain, through no fault of Recipient;

                   (b) Information which, after disclosure to Recipient, is
               published or becomes known publicly or otherwise becomes part of
               the public domain through no fault of Recipient;

                   (c) Information which, prior to the time of disclosure to
               Recipient, is known to Recipient, as evidenced by Recipient's
               written records; and

                   (d) Information which has been disclosed to Recipient in good
               faith by a third party who has not, or is not, under any
               obligation of confidence or secrecy to Company at the time said
               third party discloses to Recipient.

              3.    No rights or license to use any Information disclosed
          hereunder, either expressed or implied, is granted by Company.
<PAGE>
          Confidentiality Agreement                                    Page 3

              4.    The obligations of confidentiality and nonuse set forth
          herein with respect to any particular Information shall remain in
          effect for a period of five (5) years after the date of disclosure of
          that Information, or for as long as Company has a documentable
          confidentiality obligation to a third party for Information disclosed
          to Recipient, whichever is longer.

              IN WITNESS WHEREOF, the parties intending to be legally bound have
          caused this Agreement to be executed by themselves or by their duly
          authorized representatives as of the last date written below.

          For PI Research Corporation               For Recipient


          By:                                       By:
             ------------------------                  ----------------------
                                    
          Printed                                   Printed
          Name:                                     Name:
               ----------------------                    --------------------
                                    
          Title:                                    Date:
                ---------------------                    --------------------

          Date:
               ---------------------- 




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