OSTEX INTERNATIONAL INC /WA/
10-K405/A, 1997-10-17
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 10-K/A
     PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

           -----                      -----
             X                    ANNUAL REPORT
           -----     FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996

                                    -- or --
           -----
                                TRANSITION REPORT
           -----     FOR THE TRANSITION PERIOD FROM ____ TO ____

                        -------------------------------
                     
                            OSTEX INTERNATIONAL, INC.
                 NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER

                                     0-25250
                             COMMISSION FILE NUMBER

                               STATE OF WASHINGTON
          STATE OR OTHER JURISDICTION OF INCORPORATION OR ORGANIZATION

                                   91-1450247
                     I.R.S. EMPLOYER IDENTIFICATION NUMBER

          2203 AIRPORT WAY SOUTH, SUITE 400, SEATTLE, WASHINGTON 98134
                                  206-292-8082
           ADDRESS AND TELEPHONE NUMBER OF PRINCIPAL EXECUTIVE OFFICES

          Securities registered pursuant to Section 12(b) of the Act:
                    (none)                         (none)
                Title of Class       Each Exchange on Which Registered

          Securities registered pursuant to Section 12(g) of the Act:
                          COMMON STOCK, $.01 PAR VALUE
                                 Title of Class

    Indicate  by  checkmark  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
         ----           ----

    Indicate by check mark if disclosure of delinquent  filers  pursuant to Item
405 of Regulation S-K is not contained herein,  and will not be contained,
to the best of  registrant's  knowledge,  in  definitive  proxy  or  information
statements  incorporated  by  reference  in Part  III of this  Form  10-K or any
amendment to this Form 10-K.

           X         
         ----     


<PAGE>


This amendment is filed to correct portions of the Exhibit Index and redactions
in exhibits 10.4A, 10.4B, 10.15A, and 10.15B.





       (C)  EXHIBIT INDEX (7)

       Exhibit
       Number      Description
       -------     ---------------------------------------------------
       3.1        Articles of Incorporation, as amended, dated January 1997.

       (1)3.2      Bylaws, as amended

       (1)4.1      Specimen Common Stock Certificate

                   Stock Purchase Agreements ("Terms and Provisions"  included 
                   in Exhibit 3.1)
       (1)4.2A       Series A Stock Purchase  Agreement  dated September 1989 
       (1)4.2B       Series B Stock Purchase Agreement dated June 1992
       (1)4.2C       Series C Stock Purchase Agreement dated August 1993

       (1)4.3      Form of CS First Boston Corporation Warrant

       (1)4.4      Form of Invemed Associates, Inc. Warrant

       (2)4.5      Shareholder Rights Agreement dated January 21, 1997

       (1)10.1A    Amended and Restated Stock Option Plan
       (1)10.1B    Form of Employee Stock Option Agreement
       (1)10.1C    Form of Director's Stock Option Agreement

       (1)10.2     Directors' Nonqualified Stock Option Plan

       (1)10.3     1994 Stock Option Plan

                   Agreements with Hologic, Inc.
       (3)10.4A      Co-Promotion and Sales Representation Agreement dated 
                     January 14, 1997
       (3)10.4B      Joint Development, License and Supply Agreement dated 
                     January 14, 1997

       (1)10.5     Form of  Indemnification Agreement with officers and 
                   directors

       (1)10.6     Form of Employee Confidentiality and Invention Agreement

                   Agreements with H. Raymond Cairncross
       (1)10.7A      Employment Agreement dated April 15, 1994
       (1)10.7B      Stock Option Agreements dated June 6, 1991, July 1, 1993, 
                     July 1, 1994, April 15, 1994

       (1)10.9     Asset Purchase and Sale Agreement dated May 31, 1994 with 
                   Hybrilogic Corporation

       (1)10.10    Cooperation Agreement dated August 11, 1993 with 
                   Merck & Co., Inc.

                   Agreements with Mochida Pharmaceutical Co., Inc.
       (1)10.12A     Research and Development Agreement dated August 1992
       (1)10.12B     Osteomark License Agreement Dated August 1992
       (1)10.12C     Stock Purchase Agreement dated November 22, 1994

                   Agreements with The Washington Research Foundation
       (1)10.13A     Restated Exclusive License Agreement effective June 19, 
                     1992 (Urinary Assay for Measuring Bone Resorption)
       (1)10.13B     Amendment to Restated Exclusive License Agreement effective
                     January 1, 1993
       (1)10.13C     Second Amendment effective June 2, 1994

       (1)10.14      Exclusive License Agreement dated February 10, 1994 (O-CSF)

<PAGE>

       Exhibit
       Number      Description
       -------     ---------------------------------------------------
                   Agreements with the University of Washington
       (3)10.15A     Research Agreement dated July 1, 1996 (Molecular Markers of
                     Connective Tissue Degradation)
       (3)10.15B     Research Agreement dated October 1, 1996 (Role of O-CSF in 
                     Osteoclast Regulation)

       (1)10.16A   Know-How Transfer and Consulting Agreement dated 
                   September 18, 1989 with David R. Eyre, Ph.D.
       (1)10.16B   Extension and Amendment dated May 1, 1992

       (1)10.17    Amended and Restated Know-How Transfer and Consulting 
                   Agreement dated February 22, 1993 with Minako Y. Lee, M.D.

       (1)10.19    Osteomark EIA Exclusive Distribution License Agreement dated 
                   March 28, 1994 with Technogenetics S.R.L. (division of 
                   Recordati Pharmaceutical)

       (1)10.20    Osteomark EIA Distribution  License Agreement dated July 12,
                   1994 with BRAHMS Diagnostic (formerly Henning Berlin GMBH)

       (1)10.21    Osteomark EIA Exclusive Distribution License Agreement dated 
                   May 4, 1994 with Shield Diagnostics (Limited)

       (1)10.22    Osteomark EIA Exclusive Distribution License Agreement dated 
                   July 1, 1994 with DSL Diagnostic Products, Inc. 
                   (dba INTER Medico)

       (1)10.23    Osteomark Agreement dated February 12, 1993, as amended 
                   May 10, 1994, with Nichols Institute Reference Laboratory

       (1)10.24    Osteomark EIA Exclusive Distribution License Agreement dated 
                   September 1, 1994 with Immuno Diagnostics

       (1)10.25    License Agreement dated July 8, 1994  with Endrocrine 
                   Sciences

       (1)10.26    License Agreement dated August 1994 with Pacific Biometrics,
                   Inc.

                   Lease Agreements
       (4)10.27A     Lease Agreement dated October 2, 1995, with David A. Sabey 
                     and Sandra L. Sabey
       10.27B        First Amendment of Lease dated October 15, 1996, with the 
                     City of Seattle, successor-in-interest to David A. Sabey 
                     and Sandra L. Sabey

                   Agreements with Johnson & Johnson Clinical Diagnostics, Inc.
       (5)10.28A     Distribution Agreement dated June 7, 1995
       (5)10.28B     Research, Development, License and Supply Agreement dated 
                     June 7, 1995

       (4)10.29    Clinical Laboratory Services License and Supply Agreement 
                   dated October 25, 1995, with SmithKline Beecham Clinical 
                   Laboratories, Inc.


<PAGE>



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

       (4)10.30    Promotion Agreement dated September 20, 1995 with 
                   Wyeth-Ayerst Laboratories

       (6)10.31    Agreement with Laboratory Corporation of American Holdings 
                   (LabCorp), dated January 11, 1996

       13.0        Annual Report to stockholders for the year-ended 
                   December 31, 1996

       27.1        Financial Data Schedule

Notes to the Exhibits.

(1)    Incorporated herein by reference from Item 16(a) of Registrant's Form S-1
Registration Statement as declared effective January 24, 1995 (No. 33-86118).
(2)     Incorporated herein by reference from Form 8-A filed with the S.E.C.
in January 1997.
(3)     Confidential treatment requested.  Exhibit omits information that has
been filed separately with the Securities and Exchange Commission.          
(4)     Incorporated herein by reference from Form 10-K filed with the S.E.C
for the year ended December 31,1995.
(5)     Incorporated herein by reference from Form 10-Q filed with the S.E.C
for the quarter ended June 30, 1995.
(6)     Incorporated herein by reference from Form 10-Q filed with the S.E.C.
for the quarter ended March 31, 1996.
(7)     Copies of exhibits may be obtained at prescribed  rates from the Public
Reference  Section of the Securities  and Exchange  Commission at 450 5th Street
NW, Room 1024, Washington, D.C., 20549.


<PAGE>




                                   SIGNATURES

    Pursuant  to the  requirements  of  Section  13 or 15(d)  of the  Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned. 

                                              OSTEX INTERNATIONAL, INC.

                                          By  /S/ THOMAS A. BOLOGNA
                                            ----------------------------
                                               Thomas A. Bologna 
                                         President, Chief Executive Officer 
                                       and Member of the Board of Directors 


    Pursuant to the  requirements  of the Securities  Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
Registrant and in the capacities and on the dates indicated.


      SIGNATURE                       CAPACITIES                       DATE
      ---------                       ----------                       ----

/S/ THOMAS A. BOLOGNA      President, Chief Executive Officer
- ------------------------- and Member of the Board of Directors October 16, 1997
  Thomas A. Bologna          (principal executive officer)


/S/ Robert M. Littauer           Senior Vice President,        October 16, 1997
- -------------------------      Finance and Administration
   Robert M. Littauer          (principal financial and 
                              principal accounting officer)



Note: Confidential treatment requested.  Exhibit omits information that has
      been filed separately with the Securities and Exchange Commission.

                 CO-PROMOTION AND SALES REPRESENTATION AGREEMENT

This  Co-Promotion  and Sales  Representation  Agreement  (this  "Agreement") is
 entered into as of the 14th day of January,  1997  ("Effective  Date"),  by and
 between

HOLOGIC,  INC., a Delaware corporation having its principal place of business at
590 Lincoln Street, Waltham, MA 02154 ("Hologic" or "Company"), and

OSTEX INTERNATIONAL,  INC., a Washington  corporation having its principal place
of business at 2203  Airport Way South,  Suite 400,  Seattle,  Washington  98134
("Ostex" or Representative).

         1.       FACTS

         A. Hologic engages in the research, development, manufacture, sale, and
lease  of  diagnostic  equipment  and  other  products  in  the  field  of  bone
metabolism,  including  its line of QDR bone  densitometers.  Hologic sells this
line of bone  densitometers to physician offices,  clinics,  hospitals and other
medical  settings to measure the density and strength of the subject's  bones as
an aid in the diagnosis of osteoporosis and other bone diseases.

         B. Ostex has  developed its  proprietary  immunoassay  Osteomark(R)  to
determine the levels of the NTx epitope collagen metabolite  resulting from bone
resorption  ("NTx Assay"),  which it has  implemented  and sells in a microtiter
format.   ("Osteomark(R)   Laboratory  Test").   Ostex  sells  its  Osteomark(R)
Laboratory Test to clinical laboratories,  physician offices, clinics, hospitals
and  other  medical  settings  for the  purpose  of  measuring  the rate of bone
resorption  or breakdown of the subject's  bones as an aid in the  management of
osteoporosis and other bone diseases.

         C. The parties  believe that their products are  complementary  to each
other, and wish to enter into this Co-Promotion and Sales Agency Agreement under
which (1) Ostex will act, in the Territory,  as the sales agent for a package of
products  consisting of a Strategic  Alliance ("Fee Per Scan") Leasing  Contract
for Hologic's QDR 4500 product and a certificate redeemable for performance of a
defined  number of  Osteomark(R)  Laboratory  Tests;  and (2) the  parties  will
jointly  promote  their QDR and  Osteomark(R)  products in the  Territory  as an
integrated  approach to the  diagnosis  and  management  of  osteoporosis,  will
establish a  committee  to  coordinate  their  joint  activities,  and will take
certain other steps; all as described herein.

         D. The parties  have entered into  simultaneously  with this  Agreement
that certain Joint Development,  License and Supply Agreement  providing for the
development and sale of an NTx Meter System for point of care use in accord with
the terms set out therein (the "Development Agreement").


<PAGE>


         2.       DEFINITIONS

         (a) "Promotional  Package," as used in this Agreement,  means a package
consisting of a Strategic  Alliance  ("Fee Per Scan")  Leasing  Contract for the
Hologic QDR product and an Osteomark(R) Laboratory Certificate,  as described in
Attachment A which is attached hereto and incorporated herein.

         (b)  "QDR  Component"  as  used in this  Agreement,  means a  Strategic
Alliance ("Fee Per Scan") Leasing Contract for the Hologic QDR product specified
in Attachment A hereto.

         (c) "Osteomark(R) Laboratory Test" as used in this Agreement,  means an
immunoassay to determine levels of the NTx epitope collagen metabolite resulting
from  bone  resorption  ("NTx  Assay"),  as  marketed  and  sold by  Ostex  in a
microtiter format to centralized laboratories ("Osteomark(R) Laboratory Test").

         (d)  "Osteomark(R)  Laboratory  Certificate" as used in this Agreement,
means a  certificate  redeemable  for  performance  of a number of  Osteomark(R)
Laboratory Tests, as described in Attachment A hereto.

         (e)      "Territory," as used in this Agreement means the United States
 of America.

         (f) "First  Commercial Sale" means the first Sale of a NTx Meter System
pursuant to the  Development  Agreement for value in an arms length  transaction
with an independent third party following approval for sale by the United States
Food and Drug Administration of the NTx Meter System.

         (g)  "Confidential   Information"   means  (a)  any  and  all  normally
non-public  information  communicated or disclosed by one party ("Discloser") to
the other party  ("Recipient")  describing or relating to the Disclosing Party's
business and marketing plans and strategies,  financial information, or customer
information,  and (b) any and all  information  communicated or disclosed by the
Discloser to Recipient describing or relating to the Disclosing Party's research
and development,  Know-How, inventions, trade secrets, technical data, formulae,
drawings,   designs,  software,   models,  samples,  kits,  processes,   product
development  data and information and other data and information  related to the
business of Discloser,  labeled or specified in writing as "Confidential" or the
equivalent,  or if orally disclosed,  labeled  "Confidential" or the equivalent,
and  reduced  to  writing  within  thirty  (30)  days of such  oral  disclosure;
provided,  however,  that  "Confidential  Information"  shall  not be  deemed to
include information which the Recipient can demonstrate by written proof: (i) is
now,  or  hereafter  becomes,  through  no fault  on the part of the  Recipient,
generally  known or  available;  (ii) is known by the  Recipient  at the time of
receiving such  information;  (iii) is furnished to others by Discloser  without
restriction  on  disclosure;  (iv) is hereafter  furnished to the Recipient by a
third party unrelated to Discloser,  as a matter of right and without any breach
of any duty of non-disclosure;  (v) is independently  developed by the Recipient
without use of or  reference  to any  Confidential  Information;  or (vi) is the
subject of express written permission to disclose provided by Discloser. Without
limiting the generality of the foregoing,  Confidential  Information may include
information developed during the course of this Agreement.


<PAGE>


         3.       MARKETING COMMITTEE AND OTHER JOINT ACTIVITIES

         (a)  Immediately  upon execution of this  Agreement,  the parties shall
form  a  marketing  committee   ("Marketing   Committee")  with  two  (2)  named
representatives each from Hologic and Ostex, to oversee and coordinate the joint
marketing,  promotional,  sales, and other activities  required or authorized by
this agreement. The Marketing Committee shall meet at least quarterly, and shall
attempt to operate by consensus, but failing consensus shall operate by majority
vote.  All tie votes  shall be finally  resolved by a  committee  chairman.  The
chairmanship  shall alternate  annually between  representatives of the parties.
One of Hologic's  representatives  shall serve as chairman during the first year
of this  Agreement,  one of  Ostex's  the second  year and so on. The  Marketing
Committee may delegate  certain of its functions to  subcommittees or individual
members.  Each  party  shall  each cause its  representatives  on the  Marketing
Committee  to attempt to work to promote the goals of this  Agreement,  and most
particularly  to advance  the  parties'  mutual  products  and  technologies  as
complementary  approaches  for  the  diagnosis,   management  and  treatment  of
osteoporosis (the "Goals").

         (b) Within  thirty (30) days after the  Effective  Date,  the Marketing
Committee  shall  prepare  a  written  plan for the  first  year  period of this
Agreement  under which the  parties  shall  undertake  specified  activities  to
jointly  promote  the Goals and to  support  sales of the  Promotional  Package,
together  with a proposed  annual  budget  therefor,  and an allocation of tasks
between the parties  ("Marketing  Plan").  At least sixty (60) days prior to the
end of the first year period of this Agreement, and each subsequent year period,
the Marketing  Committee shall prepare a follow-on  Marketing Plan to cover such
upcoming year. It is anticipated  that said Marketing Plan shall include but not
be limited to (i) development and  distribution of one or more joint  brochures,
and possibly other  materials,  (ii) a program of joint  advertising  and public
relations,  and (iii) a plan to promote  the Goals  with  opinion  leaders,  and
generally, in the medical and managed care communities.  For the first year 
period, it is anticipated that the joint budget for such Marketing Plan shall 
approximate XXXXXXXXXXXXXXXXXXXXXXX.

         (c) Within  sixty (60) days after the  Effective  Date,  the  Marketing
Committee shall also establish a plan and a budget under which the parties shall
collaborate to establish a database  supporting the Goals, with the pre-approved
costs thereof to be shared equally by the parties and which database the parties
anticipate shall be owned jointly by the parties.

         (d) Except as specified in Section 3(c) above,  the parties shall share
the costs of all joint activities  undertaken pursuant to the Marketing Plan (to
the  extent  approved  in  writing  in  advance  by  the  Marketing   Committee)
on the basis of XXX to Ostex, and XXX to Hologic.  The Marketing  Committee  
shall  establish an  appropriate  mechanism to implement such cost sharing,
under which each party shall be  responsible  for payment of specific  costs for
specific  joint  activities  and shall report such costs to the other party on a
periodic  basis,  and the parties shall  reconcile and remit amounts  payable to
each  other on a  quarterly  basis,  or on such  other  basis  as the  Marketing
Committee may determine.  The parties  specifically  acknowledge  that this cost
sharing  arrangement  is not  intended  to apply to  either  party's  individual
marketing  efforts relating to its own products,  or to limit (or expand) either
party's  rights to promote its  technology  or its  approach  to the  diagnosis,
management and treatment of

<PAGE>

osteoporosis.  For the purposes of this  paragraph,  costs to be shared  exclude
employee  compensation,  fringe  benefits and  division or  corporate  overhead.
Sharable  costs include but are not limited to agency fees relating to designing
and  printing  literature,  payment to public  relations  firms,  and  spokesman
honoraria.

         4.       APPOINTMENT.

         Hologic  hereby  appoints  Ostex  and  Ostex  hereby  agrees  to act as
Hologic's non-exclusive sales representative in the Territory for the purpose of
promoting, and soliciting orders for, the Promotional Package for the account of
Hologic at such prices and upon such terms and conditions as may be from time to
time specified by Hologic.  Except as provided herein, Ostex shall have no other
right to promote or solicit orders for the Promotional  Package for installation
outside of the Territory, or for any other Hologic product.

         5.       OBLIGATIONS OF OSTEX.

         Ostex shall:

         (a) Use  reasonable  efforts  to  promote  sales of and to  secure  and
present  to Hologic  orders for the  Promotional  Package in the  Territory,  in
accord with the directions of the Marketing  Committee  described  below.  It is
anticipated  that  Ostex will  inform and assign all of its sales  people in the
Territory  to  represent  the  Promotional  Package,  will  provide  appropriate
training in conjunction  with Hologic,  will use its usual marketing  efforts to
promote the  Promotional  Package,  and will inform and involve  Hologic's sales
force as reasonably necessary and appropriate to obtain such orders.

         (b)      Meet the performance goals set out in Exhibit B hereto.

         (c)  Provide to the  Marketing  Committee  on or before  the  fifteenth
calendar day of each calendar quarter,  a written Business Report containing (i)
a summary of marketing and  promotional  activities  related to the  Promotional
Package  undertaken  during the prior  quarter  (ii) an order  forecast  listing
prospective  customers,  products,  quantity,  and dollar volume of orders under
consideration, and indicating timing and probability of each prospect; and (iii)
an identification  of any actions required to obtain such orders.  The Marketing
Committee  will agree on a format and reporting  form for said  information  and
forward such to Ostex at least 30 days prior to the first reporting date.

         (d) Not incur any liability on behalf of Hologic, nor in any way pledge
or purport to pledge  Hologic's  credit;  nor  describe or hold itself out as an
employee of Hologic,  nor  describe  itself other than as a  representative  for
Hologic for the  performance  of functions  specified  in, and pursuant to, this
Agreement;  nor make any claims,  warranties or representations  with respect to
the QDR Component except as previously approved in writing by Hologic; and


<PAGE>

         (e) Not advertise the  Promotional  Packages or distribute  any printed
matter referring to the Promotional  Package or to the QDR Component without the
Marketing  Committee's  specific prior approval in writing.  All  advertising by
Ostex shall be without  recourse to Hologic for any expense incurred unless such
expense  shall have been  specifically  authorized  in writing by the  Marketing
Committee.

         6.       OBLIGATIONS OF HOLOGIC.

         Hologic shall:

         (a) Be  solely  responsible  for the  actual  sales of the  Promotional
Package, as well as all installation,  in-service application customer training,
support,  warranty, and after-warranty service of all units of the QDR Component
ordered by reason of this Agreement. Hologic reserves the right, in its absolute
and  sole  discretion,  at any  time  and from  time to  time,  to  decline  the
acceptance of any order  transmitted to it by Ostex or through Ostex's  efforts.
All credit  appraisal of potential  customers,  risk of credit  extended to such
customers and collections  pursuant to such credit  extensions shall be the sole
responsibility of Hologic. In no event shall Ostex accept any order or otherwise
attempt  to bind  Hologic  for the  sale of any  Promotional  Package(s)  unless
specifically  asked by Hologic,  in writing,  to do so. All  remittances  by the
customer  shall be made directly to the order of Hologic and  transmitted by the
customer directly to Hologic.

         (b)  Provide to the  Marketing  Committee  on or before  the  fifteenth
calendar day of each calendar quarter,  a written Business Report containing (i)
a summary of marketing and  promotional  activities  related to the  Promotional
Package  undertaken  during the prior  quarter  (ii) an order  forecast  listing
prospective  customers,  products,  quantity,  and dollar volume of orders under
consideration, and indicating timing and probability of each prospect; and (iii)
an identification of any actions required to obtain such orders.

         (c) Upon request,  provide  reasonable  training to Ostex's sales force
respecting the QDR Component and the Promotional  Package,  and participate with
Ostex in training for Ostex's sales force  respecting  the Goals.  Hologic shall
also invite and permit Ostex to provide reasonable similar training to Hologic's
sales force respecting the Osteomark(R) Laboratory Test and the Goals.

         (d) Upon  request,  provide  reasonable  sales and  account  support to
Ostex's sales force as  appropriate to promote the  Promotional  Package and the
Goals,  and to obtain  orders  therefor.  Said sales and account  support  shall
include but not be limited to maintenance of one or more telephone help lines to
answer Ostex sales questions about the QDR Component,  development with Ostex of
appropriate  instructional  handouts,  proforma  financial  statements and other
promotional materials,  and direct assistance with any slow-moving sales; all as
agreed by the parties through the Marketing Committee.


<PAGE>

         (e) Reserve the right, in its absolute and sole discretion, at any time
and from time to time to recommend to the Marketing  Committee,  to discontinue,
modify,  alter or improve the Promotional  Package,  always providing Ostex with
reasonable notice thereof.

         (f) Notify Ostex of current prices  relating to  Promotional  Packages,
and any  changes  in the  prices  therefor.  At no time  shall  the title to any
Promotional  Packages be transferred to or vested in Ostex,  but shall remain in
Hologic at all times until transferred to a customer.

         7.       COMMISSIONS.

         (a) Hologic shall pay to Ostex, in full  compensation  for its services
performed pursuant hereto, the commissions  provided for in Attachment B hereto.
Commissions  shall be  payable  upon  Hologic  receipt of the  associated  lease
installment  or price due.  Payment  shall be made on or before the forty  fifth
(45th) day  following the end of the first three month period of the term of the
Fee Per Scan Lease Contract described in Exhibit A hereto.

         8.       INDEPENDENT CONTRACTOR - EXPENSES.

         (a)  Each  party  is  engaged  in  business  as  an  independent  sales
representative,  and the parties  acknowledge  and agree that each party, in the
performance of its duties and obligations  pursuant to this Agreement,  shall be
acting as an independent contractor and not as an employee of the other.

         (b) Except as otherwise  specifically provided in this Agreement,  each
party  shall bear all  expenses  incurred by it in acting  hereunder,  including
(without  limiting  the  generality  of  the  foregoing)  all  office  expenses,
traveling and entertainment expenses, postage and salaries of salesmen and other
personnel, as well as all advertising and promotional expenses.

         9.       TERM AND TERMINATION.

         (a) This  Agreement  shall be effective as of the date hereof and shall
extend for a period extending until First Commercial Sale of an NTx Meter System
pursuant to the Joint Development,  License and Supply Agreement  simultaneously
entered  into  between the  parties.  The parties may extend this  Agreement  by
mutual  consent  in  writing  at any  time  prior  to its  expiration,  and will
negotiate  in good  faith to extend  this  co-promotion  effort to cover the NTx
Meter Test which is the subject of the associated Development Agreement.

         (b)  Either  party  may  terminate  this  Agreement,  entirely  in  its
discretion and without liability  therefor,  by giving to the other party ninety
(90)  days  advance  written  notice,  or  upon  written  notice  if  the  Joint
Development, License, and Supply Agreement is terminated for any reason.


<PAGE>

         (c) Either party may terminate this Agreement for material  defaults of
the other party,  effective  thirty (30) days  following  written  notice to the
defaulting  party,  unless within said thirty (30) days, the party receiving the
notice remedies the default.

         (d) Hologic may terminate this Agreement,  effective on sixty (60) days
notice  (and  opportunity  to cure),  in the event that Ostex has not  presented
orders for an average of three (3)  Promotional  Packages  (or QDR  Systems) per
month during each month of the Agreement, beginning after the first three months
thereof.

         (e)  Notwithstanding  the  foregoing,  either party may terminate  this
Agreement upon notice, effective immediately,  in the event of the bankruptcy or
insolvency  of the other party,  or if the other party enters into a composition
with its creditors.

         (f) In the event of the termination of this Agreement by Hologic, Ostex
shall be entitled to receive  commissions for  Promotional  Packages sold within
thirty (30) days following the termination of this Agreement.

         (g) Upon  termination  of this  Agreement,  each party  shall  promptly
return all technical  information  and literature  relating to the other party's
component of the Promotional Packages, including price lists, samples, documents
and papers.

         (h) At any time  following  ninety (90) days after the Effective  Date,
either  party may notify the other that this  Agreement  is not  fulfilling  the
notifying  party's  business  goals,  and ask that this Agreement be modified to
meet these goals.  In this case,  the parties  shall meet and  negotiate in good
faith to modify this agreement appropriately. At this time the parties may agree
to convert this  Agreement  to provide  that Ostex will provide lead  generation
services  rather  than  act as a sales  representative  providing  orders,  with
appropriate adjustments to fees and the program as a whole.

         10.      WARRANTIES AND LIABILITIES; INDEMNITY

         (a) Except as expressly  set forth in each  party's  warranty and sales
literature   accompanying  its  component  of  the  Promotional   Packages  (and
accordingly  subject to all conditions and limitations set forth therein),  EACH
PARTY  MAKES,  AND THE OTHER PARTY AND ITS  CUSTOMERS  RECEIVE,  NO  WARRANTIES,
EXPRESS  OR   IMPLIED,   INCLUDING   WITHOUT   LIMITATION   NO   WARRANTIES   OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR AGAINST INFRINGEMENT.

         (b) Ostex hereby agrees to indemnify,  defend and hold harmless Hologic
from  and  against  all  liability,   damages  or  loss  and  from  any  claims,
proceedings, suits, demands, recoveries or expenses arising out of, based on, or
allegedly caused by, or in connection with any product manufactured by Ostex and
distributed  pursuant to this Agreement (other than the QDR Product),  including

<PAGE>

but not limited to performance of an Ostex  Laboratory Test upon redemption of a
Osteomark(R) Laboratory Certificate ("Ostex Product"), or any product claim made
or allegedly made in connection therewith. This indemnity shall not apply to any
product  claim made by Hologic with respect to an Ostex Product , which claim is
not  contemporaneously  made by Ostex,  or approved in writing by the  Marketing
Committee or Ostex.

         (c) Hologic hereby agrees to indemnify,  defend and hold harmless Ostex
from  and  against  all  liability,   damages  or  loss  and  from  any  claims,
proceedings, suits, demands, recoveries or expenses arising out of, based on, or
allegedly  caused by, or in connection with any product  manufactured by Hologic
and  distributed  pursuant  to this  Agreement  (other  than an Ostex  Product),
including but not limited to the QDR  Component  and Hologic's  line of QDR bone
densitometers  ("Hologic Product"),  or any product claim made or allegedly made
in connection  therewith.  This  indemnity  shall not apply to any product claim
made by  Ostex  with  respect  to an  Hologic  Product  ,  which  claim  was not
contemporaneously  made by  Hologic,  or  approved  in writing by the  Marketing
Committee or Hologic.  Hologic further indemnifies and holds Ostex harmless from
any  third-party  claims arising from or relating to any financial  default by a
customer of a Hologic Product.

         11.      LIMITATION OF LIABILITY.

         IN NO EVENT  SHALL  EITHER  PARTY BE LIABLE  TO THE OTHER  PARTY OR THE
OTHER   PARTY'S   DIRECTORS,   OFFICERS,    CONSULTANTS,    EMPLOYEES,   AGENTS,
REPRESENTATIVES OR CUSTOMERS FOR ANY INDIRECT,  SPECIAL OR CONSEQUENTIAL  LOSSES
OR DAMAGES, IRRESPECTIVE OF THE CAUSE THEREOF.

         12.      DEFENSE OF THIRD-PARTY CLAIMS AND INDEMNITY.

         (a) HOLOGIC DEFENSE OF THIRD-PARTY  CLAIMS AND INDEMNITY.  In the event
that any claim,  suit,  or other legal  proceeding  is  threatened  or commenced
against Ostex that is founded,  in whole or in part,  on an allegation  that the
Hologic Product infringes any trade secret,  patent, or copyright belonging to a
third  party,  Ostex  will give  Hologic  prompt  written  notice of such  legal
proceeding  and Hologic  may elect to assume  sole  control of the defense to or
settlement  of such  dispute.  Ostex shall  cooperate  fully with Hologic in any
defense,  settlement or compromise  made by Hologic.  Ostex shall not enter into
any settlement  agreement or other voluntary resolution of any such claim, suit,
or other legal  proceeding  without  obtaining  Hologic's  prior written consent
thereto.  If Ostex has  complied  fully  with the  procedures  set forth in this
Section 12,  Hologic will indemnify and hold Ostex harmless from and against any
loss,  cost,  damage,  or other  expenses  incurred by Ostex as a result of such
claim, suit or legal proceeding.  This  indemnification  provision shall be null
and void and  Hologic  shall have no  liability  to the extent that any claim is
based on any use of the Ostex Product,  or if Ostex or WRF, or their  Affiliates
have any interest in the claim, suit or other legal  proceeding,  or any license
to any right so asserted.


<PAGE>

         (b) OSTEX DEFENSE OF  THIRD-PARTY  CLAIMS AND  INDEMNITY.  In the event
that any claim,  suit,  or other legal  proceeding  is  threatened  or commenced
against Hologic that is founded,  in whole or in part, on an allegation that the
Ostex Product infringes any trade secret,  patent,  or copyright  belonging to a
third  party,  Hologic  will give  Ostex  prompt  written  notice of such  legal
proceeding  and Ostex may elect to assume  sole  control  of the  defense  to or
settlement of such  dispute.  Hologic  shall  cooperate  fully with Ostex in any
defense,  settlement or compromise  made by Ostex.  Hologic shall not enter into
any settlement  agreement or other voluntary resolution of any such claim, suit,
or other legal  proceeding  without  obtaining  Ostex's  prior  written  consent
thereto.  If Hologic has complied  fully with the  procedures  set forth in this
Section 12, Ostex will indemnify and hold Hologic  harmless from and against any
loss, cost,  damage,  or other expenses  incurred by Hologic as a result of such
claim,  suit or legal  proceeding.  If a final  injunction  is obtained  against
Hologic's  use of the Ostex  Product,  or if in the  opinion  of Ostex the Ostex
Product is likely to become the subject of a successful  claim of  infringement,
Ostex may,  at its option and  expense,  (i)  procure  for  Hologic the right to
continue distributing and/or using the Ostex Product, (ii) replace or modify the
Ostex Product so that it becomes non-infringing, or (iii) if neither (i) or (ii)
are reasonably  available,  accept return of the Ostex Product held in inventory
by Hologic and those  laboratories  which have entered into agreements to accept
Osteomark(R)  Laboratory  Certificates,  and terminate  this  Agreement  without
further obligation or liability.  This  indemnification  provision shall be null
and void and Ostex shall have no liability to the extent that any claim is based
on any use of the Hologic  Product,  or if Hologic,  or its Affiliates  have any
interest  in the claim,  suit or other legal  proceeding,  or any license to any
right so asserted.

         13.      NON ASSIGNMENT.

                  This Agreement  shall be binding upon and inure to the benefit
of the parties hereto and their respective successors and assigns; provided that
any assignment or transfer of this Agreement or any of the rights or obligations
hereunder by either party without the written consent of the other shall be void
and of no effect. Such written consent shall not be unreasonably withheld.

         14.      CONFIDENTIALITY PROVISIONS.

         (a) Recipient  shall not at any time,  during and for a period of three
(3) years  following the  termination of this  Agreement,  disclose or otherwise
make known or available to any person, firm, corporation,  or other entity other
than  Discloser  any  Confidential  Information  received  from the other  party
without the express prior written  consent of that other party.  With respect to
Confidential  Information  developed  under  this  Agreement  and  which  is not
Confidential  Information  of one party only,  neither  party shall  disclose or
otherwise make such  Confidential  Information known or available to any person,
firm, corporation,  or other entity without the express prior written consent of
the other party,  not to be  unreasonably  withheld or delayed.  Recipient shall

<PAGE>

utilize reasonable procedures to safeguard Confidential  Information,  including
releasing  Confidential  Information  only to its  employees on a "need to know"
basis.  Nothing  in this  Agreement  shall  prevent  Recipient  from  disclosing
Confidential Information to government agencies for regulatory purposes.

         (b) Recipient  shall not make any use,  directly or indirectly,  of any
Confidential  Information  of the other party except in the  ordinary  course of
business  pursuant to this Agreement or any other  specific,  written  agreement
entered into between Ostex and Hologic.

         (c) The parties  acknowledge  that: (a) the covenants set forth in this
Section 14 are essential to the activities  contemplated by this Agreement;  (b)
but for the agreement of each party to comply with such covenants, neither party
would have entered into such  activities;  (c) each party has consulted  with or
has had the  opportunity  to consult  with  counsel and has been  advised in all
respects  concerning the  reasonableness of such covenants as to time and scope;
(d) Discloser may have no adequate remedy at law if Recipient  violates or fails
to perform  under this Section 14; and (e)  Discloser  shall have the right,  in
addition  to any other  rights it may  have,  to seek from a court of  competent
jurisdiction  preliminary and permanent injunctive relief to restrain any breach
or  threatened   breach  or  otherwise  to  specifically   enforce   Recipient's
obligations  under this Section 14 if Recipient  fails to perform in  accordance
herewith.

         15.      NOTICES.

         Any notice required or permitted to be given under this Agreement shall
be in  writing  and shall be  sufficiently  given  when  delivered  in person or
deposited in the United States mail  (registered or certified)  postage prepaid,
addressed as follows:

         If to Hologic, addressed to:
         HOLOGIC, Inc.
         590 Lincoln Street
         Waltham, MA  02154 (USA)

         Attention         Mark Duerst, Vice-President - Sales & Marketing
         Copy to           Steven L. Nakashige, President and COO

         If to Ostex, addressed to:
         Ostex, International, Inc.
         2203 Airport Way South, Suite 400,
         Seattle, Washington 98134

         Attention:        Jeffrey J. Miller, Ph.D., Senior Vice President, 
                           Corporate Development
         Copy to:          Robert Glaser, President and COO

or to such other  addresses as may be  specified  from time to time in a written
notice given by such party.  Both parties  agree to  acknowledge  receipt of any
notice delivered in person.


<PAGE>


         16.      TRADEMARKS AND TRADE NAMES.

         (a) No provision of this Agreement shall be interpreted or construed as
conferring upon any party any right to use in labeling, advertising,  marketing,
publicizing or otherwise  promoting the  Promotional  Package,  any name,  trade
name, trademark, or other designation (or derivation thereof) of any other party
hereto or WRF or the University of Washington, respectively, except as expressly
provided under this Section 16.

         (b) Hologic  shall  incorporate  into the  packaging  of each and every
Osteomark(R) Laboratory Certificate marketed, promoted, sold, and/or distributed
under this  Agreement,  and in addition to its own  trademarks  and names,  such
Ostex trademarks or statements as Ostex shall reasonably  request.  Ostex hereby
grants Hologic a non-transferable,  non-exclusive  license,  concurrent with the
term of this Agreement,  to use such statement and/or trademark  accordingly and
in substantially the same manner as used by Ostex; provided,  however, that each
such use of such statement  and/or  trademark be accompanied by a printed notice
identifying Ostex as the owner thereof. Hologic furthermore shall have the right
to display its own name, trade names,  and/or trademarks.  Hologic shall not use
any Ostex trademark with respect to products not covered by this Agreement.

         (c) Ostex and Hologic shall each be responsible  for the  registration,
maintenance  and  enforcement  of  their  respective  names,  trade  names,  and
trademarks;  provided,  however,  that  each  party  shall  aid the other in the
enforcement of that party's  rights by monitoring  for, and notifying said party
of, any  unauthorized  use of any of said party's  trademarks.  Each party shall
from  time  to  time,   and  in  any  event  upon  the  issuance  of  additional
registrations,  modify its use of  trademarks  to  incorporate  proper notice of
registration  and other claims of right, in accordance with the laws and customs
of the various countries in which it operates pursuant to this Agreement.

         (d) Ostex  represents and warrants,  as of the date of this  Agreement,
that:  (a)  Ostex  is  the  owner  and  registrant  of  the  trademarks   issued
registrations  as  indicated  by Exhibit C; (b) Ostex is named as  applicant  in
those applications indicated by Exhibit C as pending; and (c) to the best of its
knowledge,  none of the Ostex  trademarks  infringes upon the  trademark,  trade
name, or other proprietary rights of an third party.

         (e) Ostex acknowledges that Hologic is the sole owner of the trademarks
and  trade  names  which  designate  and  identify  the  QDR  Component  of  the
Promotional Package and business (the "Marks").

         (f) Ostex  agrees that it may only use those Marks which  identify  the
Promotional  Packages  it is  authorized  to sell and then only to  further  the
promotion and sale of the Promotional  Packages such Marks  identify.  Ostex may
only use such Marks in their  standard  form and style as they  appear  upon the

<PAGE>

Promotional Packages or as instructed in writing by Hologic. No other letter(s),
word(s), design(s), symbol(s), or other matter of any kind shall be superimposed
upon,  associated  with or shown in such proximity to the Marks so as to tend to
alter or dilute them.

         (g) In all  advertisement,  sales and  promotional  literature or other
printed matter in which any of such Marks appear,  Ostex must identify itself by
full name and address  and state its  relationship  to Hologic.  Every such Mark
used or displayed by Ostex must be identified  as a Mark owned by Hologic,  in a
form and manner  approved by Hologic.  Each party shall have the right to review
and approve any  promotional  literature or other  printed  matter in which such
party's trademarks appear.

         (h)  Upon  expiration  or in the  event  of  any  termination  of  this
Agreement,  each party shall promptly discontinue every use of the trademarks or
any other confusingly similar word or symbol of the other.

         (i) No public  announcements or similar  publicity with respect to this
Agreement  shall be made by either party without the other party's prior written
approval and neither party may make any announcements regarding any of the other
party's  products  without the prior  written  consent of the other party.  Such
prior  written  approval and prior  written  consent  shall not be  unreasonably
withheld.  Nothing in this Section  16(i),  however,  shall prevent either party
from making such public announcements as such party's legal obligations require.
In such event,  the party who is required to make the public  announcement  will
allow the other  party to review  the  announcement  sufficiently  in advance in
order to provide suggestions on the form and substance of the announcement.

         17.      MISCELLANEOUS.

         (a) Section  headings as to the contents of particular  paragraphs  are
for  convenience  only  and  are in no way  to be  construed  as  part  of  this
Agreement,  or as a limitation of the scope of the particular paragraph to which
they refer.

         (b) Any waiver by either party of any provision of this Agreement shall
not be  construed  or  deemed  to be a waiver  of any  other  provision  of this
Agreement nor a waiver of a subsequent breach of the same provision.

         (c) This Agreement, in conjunction with the Joint Development,  License
and Supply Agreement, constitutes the entire understanding and agreement between
the parties and supersedes all prior negotiations, understandings and agreements
between  Hologic  and Ostex.  There are no  understandings,  representations  or
warranties of any kind, express or implied,  oral or written,  not expressly set
forth  herein or in the Joint  Development,  License  and Supply  Agreement.  No
amendment or  modification  of any provision of this Agreement shall be valid or
of any  force  or  effect,  unless  made by  written  instrument  signed  by the
respective duly authorized  representatives of Hologic and Ostex, specifying the
exact nature of such amendment or modification.


<PAGE>

         (d) All claims or  controversies  asserted by Ostex against  Hologic or
Serex  shall  be  construed  and  enforced  in  accordance  with the laws of the
Commonwealth  of  Massachusetts.  Any judicial  action by Ostex  relating to the
relationship between the parties pursuant to this Agreement,  or goods purchased
or licensed  hereunder  (together with any counterclaims  asserted by Hologic or
Serex),  shall be brought  and tried in the State or Federal  Courts  located in
Massachusetts.  All claims or controversies asserted by Hologic against Ostex or
WRF shall be construed and enforced in accordance  with the laws of the State of
Washington.  Any judicial action by Hologic relating to the relationship between
the parties pursuant to this Agreement, or goods purchased or licensed hereunder
(together with any counterclaims asserted by Ostex or WRF), shall be brought and
tried in the State or Federal Courts located in the State of Washington.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed
as of the day and  year  first  above  written  by their  respective  authorized
officials.

                                                     OSTEX INTERNATIONAL, INC.

                                           By       /S/ JEFFREY J. MILLER PH.D.
                                                    Jeffrey J. Miller, Ph.D.,
                                                    Senior Vice President, 
                                                    Corporate Development

                                  HOLOGIC, INC.

                                           By       /S/ S. DAVID ELENBOGEN

                                                    S. David Ellenbogen
                                                    Chairman and CEO


<PAGE>


                                    EXHIBIT A

                         PROMOTIONAL PACKAGE DESCRIPTION

QDR 4500C  System  Strategic  Alliance  ("Fee Per  Scan")  Leasing  Contract  as
described  in the  attached  Attachment  A-1.  (No  modifications  to this lease
contract can be accepted.)

Osteomark(R)  Laboratory  Certificate,  comprising a certificate for a specified
number of free tests at a specified  laboratory or laboratories ( to be mutually
agreed by Hologic and Ostex) with a value of XXXXXXX.


<PAGE>



           Attachment A-1

- -16-

HOLOGIC STRATEGIC ALLIANCE PROGRAM
EXHIBIT A-1

LEASING CONTRACT

Owner:   Hologic, Inc.                      Customer (Name): __________________
         590 Lincoln Street                 Street Address: ________________
         Waltham, MA 02154          City/State/Zip: ______________________
         (617) 890-2300                     Phone: ______________________

                         Contact: ______________________

________ QDRAE 4500C        Hologic QDR "ACCLAIM' Series" Bone Densitometer
________ QDR-1000plus      Hologic QDR Bone Densitometer
Tax Exempt# ______         Customer P.O. #__________________  Date: ____________

<TABLE>
<CAPTION>


STRATEGIC ALLIANCE PROGRAM SUMMARY
<S>      <C>                                <C>                                 <C>    

Line     Definitions                        QDR 4500C                           QDR-1000plus
1.       Usage Fee:                         $50 per study                       $50 per study
2.       Trial period (no minimums):        Six months                          Six months
3.       Deposit (credited against usage):  $5,000                              $3,000
4.       Deferred Billing                   Credit for first 100 scans          Credit for first 60 scans
5.       Minimums after six months: 30 scans per month                          25 scans per month
6.       Minimums after 12 months:  35 scans per month                          30 scans per month
7.       Conversion to own:                 Anytime                             Anytime
8.       Conversion to lease:               Anytime                             Anytime
9.       Upgrade options:                   Available to any ACCLAIM            Available to any ACCLAIM

</TABLE>

Customer Acceptance                                     Hologic, Inc. Acceptance
Customer:         _____________________ Signature: _____________________________
Signature:        __________________    Name/Title: ____________________________
Name/Title:       __________________     Date: _____________________________

Date:             _____________________________

Equipment Location:

The equipment is to be delivered and installed at the following location:

Address:          _____________________________
City:             _____________________________
State             _____________________________
Zip               _____________________________

Installation Contact Person/phone:  __________________________________________

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


<PAGE>

HOLOGIC, INC.

590 Lincoln Street, Waltham, MA 02154
Tel: 617.890.2300

Fax: 617.890.0008

TERMS AND CONDITIONS

1. Lease of Equipment.  Upon  execution of this Equipment  Lease  Agreement (the
"Agreement"),  Customer  agrees to lease  from  Hologic,  Inc.  ("Hologic")  the
equipment set forth above (the "Equipment"), subject to the terms and conditions
set forth in this  Agreement,  for a term  commencing  upon  installation of the
Equipment and, unless such lease (the "Lease") is sooner  terminated as provided
herein, terminating sixty (60) months from the date of installation.

2. Deposit.  In consideration of Hologic entering into this Agreement,  Customer
has paid to Hologic a  non-refundable  deposit plus  applicable  taxes,  if any.
During the first six months of this Agreement ('Trial Period"),  this deposit is
creditable  against the Patient Studies performed by the Customer (the first 100
scans for a QDR 4500C and 60 scans for a QDR-1000plus).

3. Lease  Payments.  Subject to the credits granted in Section 2, Customer shall
pay    Hologic    as   Lease    payments    hereunder,    an   amount    equal 
to $50.00 for each patient study performed by Customer (or any affiliate of 
Customer)  using  a  bone  densitometer  plus  taxes  and,  to  the  extent
applicable, service fees and other charges as provided herein. A "Patient Study"
means a sequence of one or more scans performed on a patient on the Equipment or
any other bone densitometer  owned, leased or operated by Customer or any of its
affiliates.  Technically unacceptable scans may be credited if Customer provides
Hologic  with  copies  of  such  studies  on  diskette  accompanied  by a  brief
description of the nature of the deficiency.

Customer  agrees to provide to Hologic,  not later than the eighth  (8th) day of
each month, a copy of the count report, produced by the software included within
each  system,  of the Patient  Studies  performed  by the  Equipment  during the
preceding  month  and a count  report of the  number  of any other  Patient
Studies  performed  during  the  preceding  month.  The lease  payment  shall be
calculated by multiplying the number of patient Studies by $50.00 and adding all
applicable  taxes.  A late fee equal to five  percent  (5%) of the  total  lease
payment due will be applied to delinquent payments (payments received by Hologic
after the thirtieth (30th) day of the month).

In the first 12 months,  the lease payments due are based on the assumption
that the Customer  will perform at least the Minimum  Monthly  Scans (30 Patient
Studies per month for a QDR 4500C and 25 for a QDR-1000plus) for a minimum lease
payment of at least $1,500 ( for a QDR 4500C) or $1,250 (for a QDR-1000plus) per
month (plus applicable  taxes)(the "Monthly Minimum").  The Monthly Minimum will
be waived for the first six months.  After 12 months, the lease payments due are
based upon the  assumption  that  Customer  will  perform at least (I) for a QDR
4500C-35  Patient Studies per month (the "Minimum  Monthly Scans") for a minimum
lease payment of at least $1,750 per month (plus applicable taxes) (the "Monthly
Minimum") or (ii) for a QDR-1000plus - 30 Patient Studies per month (the"Minimum
Monthly  Scans") for a minimum  lease payment of at least $1,500 per month (plus
applicable  taxes) (the  "Monthly  Minimum").  If Customer has not conducted the
Minimum  Monthly  scans in any  month,  beginning  after the first six months of
usage (the "Trial Period"),  Customer may nevertheless  elect to pay the Monthly
Minimum.  If Customer (a) has not paid the Monthly  Minimum  commencing with the
seventh full month after the date of  installation,  or (b) fails to perform any
of it  obligations  hereunder and such failure shall continue for ten days after
written  notice,  it is agreed that Hologic shall be entitled  without notice to
Customer and with or without legal process,  take immediate  possession- session
of such Equipment without liability to Hologic by reason of such entry or taking
possession, and terminate the Lease.

4. Conversion of Agreement. At any time, Customer may convert this Lease into an
Operating  Lease or a Full Payout Lease,  provided that Customer is then in full
compliance with the terms and conditions  hereof.  This right of conversion only
applies to Hologic  administered or authorized  lease programs.  If the Customer
converts to one of the following  lease options within the first six months from
the date of  installation,  Hologic  will  defer the  commencement  of  payments
required under the Lease for 90

PERSONAL GUARANTY

In order  to  induce  Hologic  to enter  into  this  Lease  with  Customer,  the
undersigned,  jointly and severally,  hereby  irrevocably  and  unconditionally,
guaranty without  deduction or diminution by reason of counterclaim,  offset, or
defense, the prompt and complete payment under, whenever due, and performance of
this Lease to  Hologic  or its  assigns,  including  any and all  modifications,
additions,  supplements and amendments thereof, as will as all of Customer other
leases with  Hologic that have  commencement  dates not later than ten (10) days
after Hologic  receives  written notice from the undersigned of their desire not
to guaranty any additional  leases.  The  undersigned  warrant and guaranty that
this Lease has been properly executed by Customer, and agree. that this guaranty
shall  be  of  full  force  and  effect   irrespective   of  any  invalidity  or
unenforceability  of the  Lease or any  provisions  thereof,  or the  existence,
validity or value of any  security.  The  undersigned  hereby waive  presentment
notice  of  acceptance  hereof,  all  notices  of any  kind to  which  we may be
entitled,  and all defenses of guarantor or surety. The undersigned consent that
from time to time, without notice to or further consent from the undersigned and
without releasing or affecting the undersigned's liability thereunder,  the time
for payment or  performance  under this lease may be extended or  accelerated in
whole or part, any security therefore may be exchanged, released, enforced sold,
leased or otherwise  dealt with, the provision of any documents may be canceled,
modified or waived, any other guarantors may be released, and any indulgence may
be granted to Customer,  as Hologic may in its sole  discretion  determine.  The
obligation  and  liability  of  each  undersigned  is  direct,   continuing  and
unconditional,  shall not be diminished or affected whether or not the Equipment
is repossessed, and Hologic shall not be required to proceed against Customer or
resort to any other right or remedy before  proceeding  against the  undersigned
under this guaranty.  No payment by the  undersigned,  except payment in full of
all liabilities  hereunder shall entitle the undersigned to be subrogated to any
of the rights or remedies of Hologic under this Lease.  The undersigned  warrant
they have read this  Lease  and  hereby  waive any and all  rights to a trial by
jury, and agree to the venue and jurisdiction  contained therein, and agree that
only full payment and  performance of the Lease can discharge the  undersigned's
liability.  This guaranty shall be binding upon the  undersigned  and the heirs,
representatives,  successors and assigns of the undersigned, in favor of Hologic
and Lessor's  successors  and assigns.  This  guaranty  cannot be  terminated or
changed  orally and no  provision  hereof may be  modified  or waived  except in
;writing.

x________________________________
(GUARANTOR'S SIGNATURE) AN INDIVIDUAL

- -----------------------
DATE

X________________________________
(GUARANTOR'S SIGNATURE) AN INDIVIDUAL

- -----------------------
DATE

HOLOGIC, INC.

590 Lincoln Street, Waltham, MA 02154
Tel: 617.890.2300

Fax: 617.890.0008
days.


<PAGE>

An  "Operating  Lease means a fixed rent lease with 60 monthly  payments in
the fixed  amount of the  initial  Monthly  Minimum  ($1,500 for a QDR 4500C and
$1,250 for a QDR-1000plus),  beginning on the date of conversion, with an option
for  Customer  to  acquire  the  Equipment  at the end of such term for its fair
market value, as determined by Hologic.

A "Full Payout  Lease" means a new lease whereby  Customer  would finance a
deemed  unamortized  contract price for the Equipment plus the residual value of
the  Equipment,  as  determined  by Hologic  based upon  Hologic's  amortization
schedule for this Agreement,  over a five (5) year term at then current interest
rates,  with an option for Customer to acquire the  Equipment at the end of such
term for  XXXXXXX.  During the first 12 months of this  agreement  (from date of
installation)  the fixed  monthly lease payment shall be XXXXXXX for a QDR 4500C
and XXXXXXX for a QDR-1000plus.

In connection with any such  conversion,  Hologic may require  Customer to enter
into a new lease with standard terms and conditions.  Conversion of the Lease is
conditioned upon a then current approval of Customer by Hologic.

5. Purchase Option.  At any time,  during the first 12 months from the date
of installation,  Customer shall have the right, upon written notice to Hologic,
to purchase  the  Equipment  at a purchase  price of XXXXXXX for a QDR 4500c and
XXXXXXX for a QDR-1000plus. On or after the first anniversary date from the date
of installation,  Customer shall have the right, upon written notice to Hologic,
to  purchase  the  Equipment  at a  purchase  price  equal to the sum of (a) the
present value of the total lease payments to be due to
Hologic over the term of this  Agreement,  assuming  that Customer had converted
the  Agreement  into an  Operating  Lease,  plus  (b) the  present  value of the
estimated  residual  value of the  Equipment  at the end of the five year  lease
term. The present value of the lease payments,  the estimated residual value and
the present  value of such  residual  value shall be determined by Hologic based
upon its  amortization  schedule  for this  Agreement.  Customer  shall have the
further right,  at the end of the term of the Agreement,  upon written notice to
Hologic,  to purchase the Equipment at its fair market  value,  as determined by
Hologic.

6.   Training.  Hologic shall be responsible for the initial installation of the
Equipment at Customer's premises and for training Customer's designated

equipment operator in use of the Equipment.

7. Equipment  Service and Maintenance.  Subject to Section 8, costs and expenses
relating to service and maintenance of the Equipment will be the  responsibility
of Hologic,  provided that Customer has not defaulted on any of its  obligations
under this Agreement. Following the conversion of this Agreement to an Operating
Lease, a Full Payout Lease or purchase,  all costs and expenses  associated with
equipment  service and maintenance shall be the  responsibility  of Customer.  A
full year of equipment  service and maintenance  will be provided free of charge
from the date of conversion to a lease or purchase,  for all conversions  within
six months of the date of installation.

8. Use and Alteration. Customer shall use the Equipment solely in the conduct of
its business,  in the manner and for the use  contemplated  by the  manufacturer
thereof,  and in  compliance  with all  laws,  rules  and  regulations  of every
governmental  authority  having  jurisdiction  over the  Equipment  and with the
provisions of all policies of insurance  carried by Customer.  Customer will not
make any  alterations  or additions to the Equipment or move the Equipment  from
the installation site. During the term of the Lease,  Customer shall be entirely
responsible for daily maintenance and cleaning of the Equipment and for any loss
or damage to the Equipment except for ordinary wear and tear. Customer agrees to
cause the Equipment to be operated in accordance with all manufacturer's manuals
or instructions.  While the  Equipment is in Customer's  possession,  Customer
shall  bear the  entire  risk of  loss,  theft,  destruction  or  damage  to the
Equipment.  Upon Hologic's request,  Customer will permit Hologic to have access
to the  Equipment  at all  reasonable  times for the purpose of  inspection  and
examination.

9. Customer Representations.  Customer hereby represents, warrants and covenants
that with respect to this Agreement hereunder:  (a) The execution,  delivery and
performance  thereof by the Customer have been duly  authorized by all necessary
corporate  action;  (b) The individual  executing such was duly authorized to do
so; and (c) This Agreement  constitutes the legal, valid and binding obligations
of the Customer enforceable in accordance with their respective terms.

10. Events of Default.  Customer  shall be in default under @ Agreement upon the
happening of any of the following events or conditions (herein called "Events of
Default"):  (a)  Customer  shall find to make any payment due  hereunder  within
thirty (30) days after the same is due and payable;  (b) Customer  shall fail to
perform  any other  covenant  or  agreement  to be  performed  by it under  this
Agreement,  and such  failure  shall  continue  for ten (10) days after  written
notice  thereof  by  Hologic  to  Customer;  (c) any  representation,  warranty,
certification or statement made or furnished to Hologic herein, or in connection
herewith,  by or on behalf of Customer proves to have been false in any material
respect when made or furnished; or (d) Customer shall make an assignment for the
benefit of creditors, or bankruptcy, arrangement,  reorganization,  liquidation,
insolvency,  receivership  or dissolution  proceeding  shall be instituted by or
against Customer and shall be consented to or be pending and not dismissed for a
period of thirty (30) days.

11. Remedies of Hologic. Upon the occurrence of any Event of Default, and at any
time  thereafter so long as the same shall be continuing and shall not have been
remedied,  Hologic may, at its option,  declare this  Agreement to be in default
and, at any time thereafter, may exercise one or more of the following remedies,
as Hologic in its sole  discretion  shall  elect:  (a)  accelerate  and cause to
become  immediately due and payable all amounts payable hereunder and, including
if the  Agreement  has been  converted  to an  Operating  Lease or a Full Payout
Lease,  all payments due thereunder;  (b) terminate this Agreement as to any and
all Equipment  upon written notice to Customer,  without  prejudice to any other
remedies hereunder;  (c) enter upon the premises where any Equipment is located,
and,  without  notice  to  Customer  and with or  without  legal  process,  take
immediate possession of such Equipment without liability to Hologic by reason of
such  entry or  taking  possession,  and  without  such  action  constituting  a
termination of this Agreement  unless  Hologic  notifies  Customer in writing to
such effect; and (d) proceed by appropriate action either at law or in equity to
enforce performance by Customer of the applicable covenants of this Agreement or
to recover  damages for the breach  thereof.  Hologic  shall also be entitled to
recover as damages for the loss of the  bargain and not as a penalty,  an amount
equal to the sum of the following amounts: (i) all unpaid monthly payments owing
for the Equipment  through the last day of the month in which such  Equipment is
either  sold,  released or  otherwise  disposed  of, and (ii)  expenses  paid or
incurred by Hologic in connection with the repossession, attempted repossession,
holding,  repair  and  subsequent  sale,  release  or other  disposition  of any
Equipment, including commissions and attorneys' fees. None of Hologic's remedies
under this Agreement are intended to be exclusive,  but each shall be cumulative
and in addition to

HOLOGIC, INC.

590 Lincoln Street, Waltham, MA 02154
Tel: 617.890.2300 Fax: 617.890.0008

any other remedy referred to herein or otherwise available to Customer in law or
in  equity.  Customer  waives  any and all  rights to notice  and to a  judicial
hearing  with  respect to the  repossession  of the  equipment by Hologic in the
event of a default hereunder by Customer.

12.  Title. Tide to the Equipment leased to Customer pursuant to the
terms hereof is and will remain at all times vested in Hologic or its
designee, unless and until Customer exercises its option to purchase the
Equipment pursuant to Section 5.

13.  Assignment.  Without  Hologic's  prior written  consent,  Customer will not
assign any of Customer's  rights  hereunder or sublet or transfer the Equipment.
Hologic may, at any time, mortgage, grant a security interest in, transfer, sell
or assign this  Agreement or any  Equipment or any payments due or to become due
hereunder,  without notice to Lessee.  Customer  agrees that in the event of any
such assignment and written notice thereof to Customer, Customer will accept and
comply with the directions and demands of Hologic's assignee.  THE RIGHTS OF ANY
SUCH ASSIGNEE SHALL NOT BE SUBJECT TO ANY DEFENSE, COUNTERCLAIM OR SET-OFF WHICH
CUSTOMER MAY HAVE AGAINST HOLOGIC.

14. Insurance; Taxes. Customer agrees that it shall obtain and maintain property
damage and  liability  insurance  and keep the  Equipment  insured  for its full
replacement  value,  name Hologic as an additional  insured with respect thereto
and,  upon the request of  Hologic,  will  provide a  certificate  of  insurance
acceptable to Hologic evidencing such insurance coverage. Customer agrees to pay
for, or reimburse  Hologic for payment of, all sales,  use,  privilege,  excise,
personal property or other taxes imposed or levied with respect to the Equipment
or by reason of the furnishing of the Equipment hereunder.

15. Termination.  The lease may be terminated by Customer,  prior to purchase of
the Equipment or conversion  into an Operating Lease or a Full Payout Lease upon
ninety  (90)  days  prior  written  notice  to  Hologic.  In the  event  of such
termination,  Customer agrees to pay for all Patient Studies performed up to the
date of termination, including any applicable taxes thereon. In consideration of
the  financial  accommodations  made by Hologic to  Customer  under the  leasing
program  set  forth in this  Agreement,  in the event of such a  termination  by
Customer  or a  termination  of the Lease by  Hologic,  as a result of  Customer
default or failure of Customer to pay the Monthly Minimum,  Customer agrees that
for a period  of  twelve  (12)  months  after  such  termination,  or the  fifth
anniversary   of  the  date  of  this   Agreement,   whichever   occurs   first,
Customer shall pay Hologic a minimum termination fee equal to
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  (or  any  of  its  affiliates)
performed  Patient Studies during such period;  provided  however no termination
fee shall be due if neither  Customer nor any of its affiliates  perform Patient
Studies during the termination period.

16.  Indemnification.  Customer  agrees to defend,  indemnify  and hold  Hologic
harmless  from  and  against  any  and  all  claims,  damages,  costs,  expenses
(including  attorney's fees), losses and liabilities of every kind and nature in
any  way  arising  out  of or in  connection  with  (i)  the  failure  of any of
Customer's  representations or warranties  contained herein to be true, complete
and  correct  as of the date  hereof  and at all  times  during  the term of the
Agreement,  or (ii) the breach by Customer of any  provision  of  Agreement,  or
(iii) the figure of Customer to pay any amounts owed under this Agreement as and
when the same shall  become due or (iv)  failure to maintain  the  Equipment  as
provided in Section 8 or (v) the use of the Equipment  other than, in accordance
with Hologic's instructions for use.

17. Further  Assurances.  Customer will promptly  execute and deliver to Hologic
such further  documents and  assurances  and take such further action as Hologic
may from time to time reasonably  request in order to more effectively carry out
the purpose of this  Agreement and to protect the rights and remedies of Hologic
hereunder,   including,  without  limitation,  the  execution  and  delivery  of
financing, statements under the Uniform Commercial Code.

18.  Proprietary  Software.  It is  recognized  that  during  the  term  of this
Agreement,  computer  software will be delivered to Customer on a licensed basis
in printed  form, or in any of several  possible  machine-readable  forms.  Such
computer software is and shall remain the sole property of Hologic. The grant to
Customer of rights to the software extends solely a non-exclusive,  single-use
royalty-free  license to use  software for the sole  purpose of  performing  and
analyzing  scans  acquired  in the  normal  course  of its  business,  using the
Equipment  and for no other  purpose.  Such  software is valuable to Hologic and
shall be treated as  confidential  and  proprietary  information  subject to the
confidentiality  provisions hereof. Customer will have no right to sell, assign,
transfer, copy or sublicense the software,  without the prior written consent of
Hologic.

19. Confidential Information.  All drawings, diagrams,  specifications,  devices
and other materials furnished by Hologic and identified as confidential relating
to use and service of the Equipment and the information therein,  including, but
not limited to, Customer Manual provided to it by Hologic in connection with the
Equipment,  is proprietary and confidential to Hologic. Such materials have been
developed at great expense and they contain  trade secrets of Hologic.  Customer
may not reproduce or distribute  such materials  except to Customer's  employees
who may use the articles as part of their duties.  Customer  agrees that it will
keep  confidential  and not  disclose  or divulge any of such  materials  or the
information  therein  to any  unauthorized  person  for any  purpose  whatsoever
without the prior written consent of Hologic.

20. Disclaimers; Warranties. CUSTOMER ACKNOWLEDGES AND AGREES THAT HOLOGIC MAKES
NO EXPRESS OR IMPLIED WAR- RANTIES  ARISING OUT OF OR RELATED TO CUSTOMER'S  USE
OR  OPERATION  OF THE  EQUIPMENT.  IN NO EVENT  SHALL  HOLOGIC BE LIABLE FOR ANY
INDIRECT,  SPECIAL,  INCIDENTAL  OR  CONSEQUENTIAL  DAMAGES  ARISING  OUT  OF OR
ASSOCIATED  WITH THE  EQUIPMENT  OR THE LEASE  THEREOF  EVEN IF  ADVISED  OF THE
POSSIBILITY OF SUCH DAMAGES.

21. Entire  Agreement;  Governing  Law. This  Agreement  constitutes  the entire
agreement  between the parties.  This Agreement  shall be deemed a contract made
under the laws of the Commonwealth of Massachusetts shall be construed under and
governed  by  the  laws  thereof.  The  invalidity  or  unenforceability  of any
provision of this Agreement shall not affect the validity or  enforceability  of
any other provision hereof.  Customer waives any right to a trial by jury in any
action  to  enforce  or  defend  any  matter  arising  from or  related  to this
Agreement.

22.  Amendment;  Waiver.  No term or provision of this Agreement may
be changed, waived, amended, discharged or terminated except by a written

instrument executed by the parties hereto.

HOLOGIC

590 Lincoln Street, Waltham, MA 02154
Tel: 617.890.2300 Fax: 617.890.0008


<PAGE>




                                    EXHIBIT B

                                   COMMISSION

An amount equal to the Patient Study or other lease  payment  amounts (i.e.
$50 per  Patient  Study)  payable to Hologic or  credited  to  deposits  held by
Hologic  pursuant to the Strategic  Alliance  Leasing  Contract during the first
three month period  commencing  with the beginning of the term of said Contract,
not  including  deposits  paid or due,  or taxes and to the  extent  applicable,
service fees and other charges provided for in said contract,  and provided that
if the Lease  Contract  is  converted  to a sales  contract  during  said period
Hologic will pay an additional finders fee of XXXXXXX.

Note: During the term of this Agreement,  Hologic will also provide finders fees
and sales assistance fees pursuant to its then-current  Policy for Non-Exclusive
Distribution and Finder's Fees (current  version  attached) for sales of all QDR
4500 model Systems in the Territory as a result of qualified  leads  provided by
Ostex.

                                PERFORMANCE GOALS

Three (3) Promotional Packages per month.


<PAGE>





                                  HOLOGIC, INC.

                       POLICY FOR FINDER'S FEE ELIGIBILITY

                                January 13, 1997

SALES REPRESENTATIVES

Under  this form of  relationship,  the Sales  Representative  presents  to
Hologic  contracts with Hologic  approved sales  prospects,  which are not being
solicited  by  Hologic's  direct  sales force or another  Sales  Representative.
Hologic coordinates the activities of its Sales  Representatives and sales force
by requiring that sales prospects be registered.  Hologic may approve a proposed
sales  prospect,  disapprove  it, or disapprove  the prospect but offer to pay a
sales  assistance  fee.  Normally,  Hologic will not approve a sales prospect if
either  Hologic's  sales  force,  or another ISO is pursuing  the  prospect.  If
Hologic is pursuing the prospect  directly,  Hologic may pay a sales  assistance
fee. Once Hologic has approved a proposed prospect,  the Sales Representative is
eligible for a commission  whether the prospect places an approved order through
the Sales  Representative,  or directly with Hologic,  but not if a sale is made
through  an  Hologic  Distributor.   Hologic's  registration  process,  and  its
commission  and sales  assistance  policies are  described in more detail in the
next section.

SALES COMMISSIONS (FINDER'S FEES)AND SALES ASSISTANCE FEES

REGISTRATION OF PROSPECTS

Hologic requires formal  registration of prospects to become eligible for a
commission or sales  assistance  fee. A registration  form has been attached for
use in this  process.  Prospect  registrations  are to be filed with the Hologic
Regional Sales Manager for your area. Status of prospect shall be confirmed with
you, in writing, within 72 hours of receipt of registration form.  Registrations
remain  "active"  for six months from date of receipt  and  approval by Hologic.
Prospects must be re-registered  for consideration  beyond this period.  Hologic
reserves the right to reject  prospects from any of the programs listed above at
its sole discretion.

COMMISSIONS/FINDERS FEES

Once a prospect has been registered, Finder's fees are paid once a sale has
been successfully  completed  including full collection of all amounts due. Fees
are paid according to the schedule listed below:

QDR 1000        XXXXXXX
QDR 4500C       XXXXXXX
QDR 4500W       XXXXXXX
QDR 4500SL      XXXXXXX
QDR 4500A       XXXXXXX

Hologic shall reduce Finder's fees by XXX in instance that purchase is made
as a part of an established national buying contract with Hologic. Fees may also
be reduced or  renegotiate  in the  instance of multiple  system  purchases by a
customer,  and may be increased  in  situations  where the Sales  Representative
commits to a marketing plan and substantial minimum sales quota.

SALES ASSISTANCE FEE

In the  instance  where a sales lead is  provided  to Hologic  and  Hologic
determines  that this lead is  already  an "active  prospect"  in  contact  with
Hologic's  direct sales  organization,  the independent  sales  organization can
still earn a fee through active  support of Hologic I its sales  efforts.  To be
eligible for these fees, the sales  organization must provide Hologic's prospect
with a written  recommendation and endorsement of Hologic's products. If Hologic
is successful in completing the sale (including collection) with this registered
prospect, the sales organization shall receive a sales assistance fee of XXXXXXX
for its help with the account.

<PAGE>


CUSTOMER LETTERS

The  Finder's  Fee and  Sales  Assistance  Fee  programs  require  that the
independent  sales  organization  take  active  measures  in support of the sale
between the registered prospect and Hologic.  These active measures must include
the sending of at least one "consultative  sales letter" supporting the purchase
of Hologic's  equipment to the  prospect.  A copy of this letter,  issued on the
ISO's  letterhead  is to be  provided  to  Hologic  as a part  of  the  prospect
registration process (see below).  Hologic has provided you with example letters
for this purpose as a portion of this package.  Independent  sales  organization
will not be eligible for fees if this requirement has not been fulfilled.

CHECKLIST OF ACTIVITIES REQUIRED OF SALES ORGANIZATION TO EARN FEES

Hologic has attempted to keep the process for earning sales fees simple yet
fully documented for the protection of the independent sales  organization.  For
this  procedure  to work  properly,  Hologic's  insists that all  procedures  be
followed.

FINDER'S FEE PROGRAM STEPS

1.  Complete Prospect Registration Form;
2.  Supply registration form to Hologic's Regional Sales Manager for your
area (see map);
3.  Obtain prospect status from Hologic (generally within 72 hours)confirming 
it is not an active Hologic prospect;
4.  ISO issues "customer letter" to prospect, with copy to Hologic (completing
prospect registration form)
5.  Hologic and ISO coordinate account follow-up
6.  Hologic issues quotation to prospect
7.  ISO and Hologic cooperate in management and communicating account status
8.  Order issued to Hologic by prospect
9.  Prospect completes payments on purchase as required
10.  Fees issued to ISO

SALES ASSISTANCE FEE PROGRAM STEPS

1.  Complete Prospect Registration Form;
2.  Supply registration form to Hologic's Regional Sales Manager for your area
(see map);
3.  Obtain prospect status from Hologic (generally within 72 hours)confirming 
it is not an active Hologic prospect;
4.  Independent Sales Organization issues "customer letter" to prospect with 
copy to Hologic (completes prospect registration process)
5.  Hologic issues any quotations required (note that these may have already 
been issued)
6.  Independent sales organization and Hologic cooperate in management and 
communicating account status
7.  Order issued to Hologic by prospect
8.  Prospect completes payments on purchase as required
9.  Fees issued to independent sales organization


<PAGE>


                           PROSPECT REGISTRATION FORM

Prospect Name     ____________________

Address           ____________________

                           --------------------
City                       ____________________
State                      ____________________
Zip                        ____________________

Phone                      ____________________
FAX                        ____________________

OTHER CONTACTS AT ACCOUNT: (examples: partners, secretaries, business managers,
 administrators, purchasing agents)

Name / Phone:

ACCOUNT BACKGROUND AND INTEREST

(Supply a short summary of account activity to date)

COMPETITION

BUDGET INFORMATION


<PAGE>


                             SAMPLE CUSTOMER LETTER

Dear Customer:

Thank you for inquiring about bone densitometry  equipment with our firm. I have
taken the  liberty of  investigating  these  products  for you and would like to
share some information with you that may assist in your selection.  As you know,
our firm has a sales agency relationship with Hologic,  and can introduce you to
this company.

The bone  densitometry  business  is  dominated  by only a couple of  companies.
Hologic,  Inc. of Waltham,  MA  (800-343-9729)  is the leader in this field (60%
market share). Their equipment is considered to be the most technically advanced
and  easiest to use.  Their  equipment  has been  selected  by nearly all of the
pharmaceutical companies for development of the new osteoporosis drugs including
Merck's  Fosamax  trials.  Hologic  equipment  has  also  been  used  in the NIH
sponsored Study of Osteoporotic  Fractures (SOF), the largest osteoporosis trial
in the world,  and in the NHANES study which has  established the reference data
that the industry is using in its standardization efforts.

Hologic  offers  a full  product  line of both  pencil  and  fan  beam  scanners
available at most price points.  We would highly recommend that you consider the
fan beam  products  which are of the latest  design.  The pencil  beam units are
inexpensive  but  are  based  on 8 year  old  technology  that is  incapable  of
providing  many of the new  advances.  Although  Hologic  equipment is typically
slightly  higher in price  than their  competitors,  we believe it is money well
spent and easily justified  through savings in tech time,  marketing  advantages
offered and long term costs of ownership.  The latest  developments in the field
are available on the Hologic equipment including:

Fan Beam  Technology - Offers faster scan times (30 sec. on all patients),  high
resolution images, enhanced precision,  significant operational conveniences and
modular product design.

Internal  Reference System - The system constantly  calibrates itself on a pixel
by pixel basis. No operator calibration (or mistakes) are possible. This assures
consistency in data upon upgrade or repair.

Supine Lateral  Scanning - Many  luminaries  now suggest  lateral spine scans in
patients  over  age 65 where  artifacts  lead to false  negative  findings  with
traditional  AP scans in as many as 30-40% of patients.  Lateral  scans may also
provide  earlier  diagnostic  capability  and  earlier  information   concerning
response to treatment  since they focus on trabecular  regions of the spine.  If
you decide that you want laterals, do not settle for the decubitis options which
suffer  from  substantial  precision  problems.  Note too that with the  modular
design of the 4500 family, laterals can always be added at a later date.

Single Energy Imaging - This is brand new to low end densitometers. High end fan
beam system have offered  imaging / morphometry  options in the past but Hologic
has  recently  made this  available on all fan beam  systems.  The 7 second full
spine  scan  gives a nice  image at very low dose and may be useful in  spotting
artifacts  (wedge  fractures)  that could  artificially  elevate spine  density.
Although  these  images will not  replace  films,  they do provide  quantitative
morphometry  capability  and could be used to  "screen"  candidates  for further
evaluation  through  use of films.  Imaging  will  probably be expanded to other
applications soon and fan beam systems are required for this capability.

Modular  Product  Design  - This  is one of the  best  features  of the  Hologic
products. The field is changing very rapidly and Hologic has made a point of not
forcing  decisions  upon  buyers  nor making  their  equipment  obsolete.  Their
philosophy  is to allow  you to buy only what you need now and to add to that as
needs  dictate.  They have  eliminated  the financial  penalty  associated  with
upgrades using other manufacturer's  equipment and the significant data concerns
if equipment is to be exchanged.

We have also found  Hologic's  service to be reputable.  The DXA equipment seems
quite  reliable but 800 "HELP " lines and next day on site service is available.
Hologic is the only  company  that does all of their own service  using  factory
- -direct Hologic personnel.

We hope that this information is useful.  [ADD APPROPRIATE FOLLOW-UP LANGUAGE]

Sincerely,


<PAGE>


Note:  Confidential treatment requested.  Exhibit omits information that has
       been filed separately with the Securities and Exchange Commission.      
                                                         1

                           JOINT DEVELOPMENT, LICENSE

                              AND SUPPLY AGREEMENT

         This Joint Development, License and Supply Agreement (this "Agreement")
is entered into as of the 14TH day of January,  1997 ("Effective  Date"), by and
between OSTEX INTERNATIONAL, INC., a Washington corporation having its principal
place of business  at 2203  Airport Way South,  Suite 400,  Seattle,  Washington
98134 ("Ostex"),  and HOLOGIC, INC., a Delaware corporation having its principal
place of business at 590 Lincoln Street, Waltham, MA 02154 ("Hologic").

                                    RECITALS

         A.  The  Washington  Research   Foundation,   a  nonprofit   Washington
corporation  ("WRF"),  is the owner, by way of assignment from the University of
Washington,  of all right,  title, and interest in certain technology  developed
out of research  conducted  by Dr.  David Eyre and  generally  described  as the
"Urinary Assay for Bone Resorption" (as more  particularly  defined herein,  the
"WRF Bone Resorption Technology").

         B.  Pursuant  to that  certain  Restated  Exclusive  License  Agreement
between  Ostex and WRF,  effective  June 29,  1992 as amended,  the  ("WRF/Ostex
Exclusive License Agreement"), WRF granted Ostex an exclusive, worldwide license
to make,  have  made,  assign,  sublicense,  lease,  develop,  enhance,  modify,
produce, reproduce, demonstrate, market, promote, sell, distribute, use, exploit
and otherwise  commercialize and prepare  derivations of the WRF Bone Resorption
Technology.

         C. Ostex engages in the research, development, manufacture, and sale of
diagnostic and therapeutic  products in the field of bone and mineral metabolism
in applications  related to bone  resorption and collagen and connective  tissue
degradation, and has developed a proprietary immunoassay to determine the levels
of NTx epitope  collagen  metabolite  resulting from bone resorption ("NTx Assay
Technology" as further defined in SECTION 1.15 hereof), which it has implemented
in  a  microtiter   format   suitable  for  use  in   centralized   laboratories
("OsteomarkAE Laboratory Test").

         D. Serex,  Inc., a New Jersey  Corporation  with its principal place of
business at 230 West Passaic Street,  Mayfield,  New Jersey 07607 ("Serex") also
engages in research and  development of diagnostic  products in various  fields,
including the field of bone and mineral metabolism,  and applications related to
bone  resorption  and  collagen  and  connective  tissue  degradation;  and  has
developed  a  proprietary  immunodiagnostic  format for  detection  of  analytes
associated  with  various  disease  states  and  conditions  (including  without

<PAGE>

limitation the technology embodied in the patents and patent applications listed
in ATTACHMENT D hereto (the "Serex Patent Rights")), together known as the Serex
Antibody  Release  Assay  ("SARA  Format").  Serex  has  also  developed  and is
continuing  to develop an  immunoassay  to determine  the levels of  metabolites
resulting  from  bone  resorption  (targeted  to a peptide  linked  pyridinoline
epitope  collagen and  potentially  to other  metabolites)  suitable for various
uses,  including  point of care and home or other  over-the-counter  ("OTC") use
("PLP Assay").

         E. Hologic engages in the research, development, manufacture, sale, and
lease  of  diagnostic  equipment  and  other  products  in  the  field  of  bone
metabolism,  including  its  lines  of  QDR  x-ray  bone  densitometers,  Sahara
ultrasound  bone  sonometers  and  associated   systems  for  analysis  of  bone
metabolism  data.  Pursuant to an agreement dated September 30, 1994 as amended,
(as  amended,  the  "Hologic/Serex  Agreement"),  Hologic  has  entered  into  a
cooperation with Serex under which Hologic has funded Serex's development of the
PLP Assay  for use with the SARA  Format,  and has  obtained  certain  exclusive
rights and licenses to distribute the products  resulting from this cooperation.
In an associated undertaking, Hologic has undertaken to develop a meter suitable
for point of care use to read assays in the SARA Format.

         F. Ostex and Hologic  desire to engage in a  development  project under
which  Hologic will cause Serex to implement  the NTx Assay  Technology  to work
with the SARA  Format in a strip  format  (the  "NTx  Meter  Strip")  and with a
Hologic-developed  stand-alone  meter for  point of care use (the "NTx  Meter"),
which NTx Meter Strip and NTx Meter are  collectively  referred to herein as the
"NTx Meter  System".  Hologic  will  arrange for  manufacture  of said NTx Meter
Strips and NTx Meters.

         G. Ostex desires to contribute to this development  project by granting
to Hologic a license to use the NTx Assay  Technology  in  connection  with this
development  project,  by providing "Critical Reagents" (as this term is defined
in SECTION 1.15 hereof)  needed for this  development  project at no charge,  by
contributing  to the costs of said  project,  and by selling  Critical  Reagents
needed for manufacture of the NTx Meter Strips at its manufacturing cost, all as
more specifically described in this Agreement.

         H. In return,  Hologic  and Ostex will each sell said NTx Meter  Strips
and Meters,  and shall  share the  profits  thereof  through  the  mechanism  of
reciprocal  royalties,  all as more  specifically  described in this  Agreement.
Hologic may also  integrate  its meter  technology  with and into other  Hologic
products, and may sell such products without royalty.

         I. Simultaneously  with this Agreement,  Ostex and Hologic have entered
into that certain  Co-Promotion  Agreement  providing  for the  co-promotion  of
Hologic  products  and Ostex's  OsteomarkAE  Laboratory  Test in its  microtiter
format in accord with the terms set out therein (the "Co-promotion Agreement").

                               TERMS OF AGREEMENT

         In  consideration  of the mutual  covenants  and  agreements  contained
herein,  and  for  other  good  and  valuable  consideration,  the  receipt  and
sufficiency of which are hereby acknowledged, the parties agree as follows:

<PAGE>

         1.       DEFINITIONS.  The following definitions shall apply throughout
                                this Agreement.

                  1.1 "Affiliate"  means,  with respect to any person or entity,
any  individual,   corporation,  company,  firm,  partnership  or  other  entity
controlled  by, in control  of, or under  common  control  with,  such person or
entity,  where "control" means direct or indirect legal or beneficial  ownership
of fifty  percent  (50%) or more of the shares,  business  interests,  or voting
securities of another corporation,  company,  firm, partnership or other entity,
or the right to fifty percent  (50%) or more of the income of such  corporation,
company, firm, partnership or other entity. Notwithstanding the foregoing, Serex
shall be considered an affiliate of Hologic.

                  1.2 "WRF Bone Resorption  Technology"  means all technology to
which Ostex has rights  relating to assays,  methods,  and materials,  including
Critical Reagents,  for measuring bone collagen  metabolites;  having first been
developed  from research  conducted by Dr. David Eyre,  owned by the  Washington
Research Foundation,  and licensed exclusively to Ostex. The WRF Bone Resorption
Technology includes,  without limitation,  the urinary diagnostic assay known as
the Osteomark immunoassay.

                  1.3 "Confidential  Information" means (a) any and all normally
non-public  information  communicated or disclosed by one party ("Discloser") to
the other party  ("Recipient")  describing or relating to the Disclosing Party's
business and marketing plans and strategies,  financial information, or customer
information,  and (b) any and all  information  communicated or disclosed by the
Discloser to Recipient describing or relating to the Disclosing Party's research
and development,  Know-How, inventions, trade secrets, technical data, formulae,
drawings,   designs,  software,   models,  samples,  kits,  processes,   product
development  data and information and other data and information  related to the
business of Discloser,  labeled or specified in writing as "Confidential" or the
equivalent,  or if orally disclosed,  labeled  "Confidential" or the equivalent,
and  reduced  to  writing  within  thirty  (30)  days of such  oral  disclosure;
provided,  however,  that  "Confidential  Information"  shall  not be  deemed to
include information which the Recipient can demonstrate by written proof: (i) is
now,  or  hereafter  becomes,  through  no fault  on the part of the  Recipient,
generally  known or  available;  (ii) is known by the  Recipient  at the time of
receiving such  information;  (iii) is furnished to others by Discloser  without
restriction  on  disclosure;  (iv) is hereafter  furnished to the Recipient by a
third party unrelated to Discloser,  as a matter of right and without any breach
of any duty of non-disclosure;  (v) is independently  developed by the Recipient
without use of or  reference  to any  Confidential  Information;  or (vi) is the
subject of express written permission to disclose provided by Discloser. Without
limiting the generality of the foregoing,  Confidential  Information may include
information developed during the course of this Agreement.

                  1.4  "COGS"  means  all  costs  of  materials  and  components
(including  purchase costs and royalties) and personnel expended on fabrication,
quality control, and regulatory documentation,  plus a portion of overhead based
on the portion of resources allocated to manufacturing and shipping,  calculated
in accord with generally accepted accounting principles.

<PAGE>

                  1.5 "Critical  Reagents" means the set of reagents supplied by
Ostex for use in the development of the NTx Meter Strips,  currently  consisting
of:  monoclonal  antibodies  or fragments  thereof,  for example the  monoclonal
antibody produced by hybridoma 1H11, that shows specific  immunoaffinity for the
NTx Epitope (at  concentrations to be agreed on,  appropriate for use in the NTx
Meter Test) antibody diluent;  analyte (NTx  Epitope)-containing  controls;  and
other  reagents.  Reagents  will be supplied by Ostex "in bulk,"  provided  that
Ostex shall also supply a reasonable number of Osteomark(R) Laboratory Test Kits
in a microtiter plate format for Serex use for comparison and control  purposes.
As of the effective date of this Agreement,  Critical  Reagents include the 1H11
monoclonal antibody,  diluent,  calibrators and controls.  These reagents may be
changed upon mutual agreement of the parties and upon reasonable notice to scale
up to commercial quantities. The term "Critical Reagents" shall also include any
improvement to or successor antibody(ies) with immunoaffinity to the NTx Epitope
or similar  epitopes  resulting from bone  resorption  which may be developed or
marketed by Ostex in any form during the term of this Agreement.

                  1.6  "Discovery"  means  any  scientific,   technological,  or
commercial invention, discovery, development,  improvement, Know-How, or product
resulting from the activities  contemplated by the parties under this Agreement,
whether or not the same is patentable.

                  1.7  "Distribution   Network"  shall  mean  a  party  to  this
Agreement  acting  as a  seller  together  with  its  authorized  resellers  and
sublicensees.

                  1.8  "Field of Use"  means use with the SARA  Format,  and the
associated  NTx Meter or other  Hologic meter  technology  for use as a point of
care device.

                  1.9  "First  Commercial  Sale"  means the first  Sale of a NTx
Meter  System  by  the  Distribution  Network  for a  value  in an  arms  length
transaction with an independent  third party following  approval for Sale by the
United States Food and Drug Administration of the NTx Meter System.

                  1.10     "Gross Profit" means Net Sales less COGS.

                  1.11 "Gross Sales" means gross receipts,  royalties,  fees and
other valuable  consideration of any kind received directly or indirectly by, or
credited to the benefit of the seller and  permitted  Affiliates  in  connection
with all Sales to end-users and third-party  distributors.  Without limiting the
generality of the foregoing,  Gross Sales include without limitation,  interest,
late  charges,  time-price  differentials  and other  receipts  or  credits of a
similar nature.

                  1.12  "Know-How"  means any  method,  information,  procedure,
process, composition of matter, biological material, or other subject matter.

                           1.12.1  "Hologic  Know-How"  means  Know-How  that 
has been  developed  or acquired by Hologic, prior to or during the term of 
this Agreement.


<PAGE>

                           1.12.2   "Ostex  Know-How"  means Know-How that has 
been developed or acquired by Ostex, prior to or during the term of this 
Agreement.

                           1.12.3   "Serex  Know-How"  means Know-How that has 
been developed or acquired by Serex, prior to or during the term of this 
Agreement.

                  1.13 "Hologic  Intellectual Property Rights" means all Hologic
Know-How,  trade secrets,  Confidential  Information,  Hologic patent rights and
other intellectual  property rights owned or controlled by Hologic  individually
or in  conjunction  with  others and  related  to the field of bone and  mineral
metabolism,   meter  technology,   biochemical  markers,  or  medical  practice,
including  but not limited to Hologic's  rights to Serex  Intellectual  Property
Rights pursuant to the Hologic/Serex Agreement.

                  1.14  "Serex  Intellectual  Property  Rights"  means all Serex
Know-How,  trade secrets,  Confidential  Information,  Serex Patent Rights,  and
other intellectual property rights owned or controlled by Serex and individually
or in  conjunction  with  others and  related  to the field of bone and  mineral
metabolism,  meter  technology,  biochemical  markers,  diagnostic  products and
methods, or medical practice, including but not limited to the PLP Assay and the
SARA Format.

                  1.15 "NTx  Assay  Technology"  means a urine-  or  serum-based
immunoassay  for bone collagen  metabolites  comprising an NTx Epitope,  and any
successor  immunoassay utilizing WRF Bone Resorption  Technology,  together with
associated controls and other products, the manufacture,  use, offer for sale or
Sale of which  would,  but for the  licenses  granted  herein,  infringe a Valid
Claim.

                  1.16 "Net Sales" means Gross Sales,  less normal and customary
trade, quantity,  and cash discounts allowed and actually taken,  allowances for
credits  granted or  returns,  and  commissions  paid or allowed to  third-party
distributors.

                  1.17 "NTx Epitope" means a conformational  structure  included
within the natural crosslinked  telopeptides from type I collagen,  to which the
monoclonal antibody (mAb) produced from the hybridoma 1H11 binds specifically by
immunoaffinity.

                  1.18  "Ostex  Intellectual  Property  Rights"  means all Ostex
Patent Rights, Ostex Know-How, trade secrets, Confidential Information statutory
and common-law  trademark rights, and other intellectual  property rights owned,
licensed or controlled by Ostex during the term of this Agreement and related to
the WRF Bone Resorption Technology.

                  1.19     "Ostex  Patent  Rights"  means all  rights of Ostex,
  as  licensee  under the  WRF/Ostex Exclusive License  Agreement,  in and 
to any and all subject matter claimed in or  disclosed  by U.S.  patents  and 
patent  applications   referred  to  in  the  WRF/Ostex  Exclusive  License
Agreement,  including  without  limitation  U.S. Patent  Application  Serial No.


<PAGE>

118,234   filed   November   6,   1987,   and  any   divisions,   continuations,
continuations-in-part  or reissues arising  therefrom or issuing  thereon,  U.S.
Patent No.  4,973,666 issued November 27, 1990, U.S. Patent No. 5,140,103 issued
August 18, 1992, U.S. Patent No. 5,300,434 issued April 5, 1994, U.S. Patent No.
5,320,970  issued June 14, 1994, U.S. Patent No.  5,532,169 issued July 2, 1996,
U.S. Patent No.  5,455,179  issued October 3, 1995,  U.S.  Patent No.  5,473,052
issued  December 5, 1995, U.S.  Patent No.  5,576,189  issued November 19, 1996,
U.S. Patent No.  5,472,884  issued December 5, 1995 along with any and all other
patent rights  applicable,  owned by WRF and licensed to Ostex,  and related to,
derived  from,  or claiming  priority  from any such U.S.  patent  applications,
including  without  limitation  International  Application  No.  PCT/US88/03722,
International  Application  No.  PCT/US90/7015,  International  Application  No.
PCT/US92/04104.
                  1.19A  "Hologic  Patent Rights" means all rights of Hologic in
and to any and all subject  matter  claimed in or disclosed by U.S.  patents and
patent  applications owned or assigned to Hologic relating to the subject matter
of the Hologic/Serex Agreement.

                  1.20 "Sale" means any and all transactions  whereby a party or
its Affiliates sell, lease, rent, or otherwise transfer or dispose of to (i) any
end-user,  including  without  limitation  any  physician's  office or  clinical
laboratory  purchaser,  or  (ii)  any  third-party  distributor,  any  right  of
ownership, or any other right to possession.

                  1.21 "Valid Claim" means a claim in any unexpired Ostex Patent
Right which has not been held invalid by a non-appealed or unappealable decision
by a court or other appropriate body of competent jurisdiction.

         2.       LICENSE GRANTS.

                  2.1 NTX METER  STRIP.  Ostex  hereby  grants to Hologic and to
Hologic's "permitted assigns" for the term of this Agreement, and Hologic hereby
accepts,  a nonexclusive,  worldwide,  nontransferable  license in and under the
Ostex  Patent  Rights  and Ostex  Know-How,  to  develop,  manufacture  and have
manufactured,  and to market,  promote, offer to sell, sell, distribute and have
marketed,  promoted,  sold and  distributed  in any country in the World  except
Japan,  the NTx  Meter  System  (incorporating  the  NTx  Assay  Technology  and
utilizing the Critical  Reagents) within the Field of Use, all in return for the
Ostex rights set out herein.

                  2.2      HOLOGIC OPTION TO MANUFACTURE.

                           2.2.1    CRITICAL  REAGENTS  FOR NTX METER  STRIP(S).
Ostex hereby grants Hologic an option,  exercisable by Hologic  pursuant to
the   terms  of   SECTION   6.3.3   below,   to  a   temporary,   non-exclusive,
nontransferable, royalty-bearing license under the Ostex Patent Rights and Ostex
Know-How to manufacture or have manufactured,  purify or have purified, Critical
Reagents at a manufacturing facility in the United States (or such other country
as the parties  may  agree),  for the sole  purpose of  manufacturing  NTx Meter
Strips for  distribution  within the Field of Use  pursuant to the terms of this
Agreement.


<PAGE>

                           2.2.2    The terms of any license granted  pursuant 
to SECTION 2.2.1 shall be subject to payment to Ostex of a royalty equal to
the  transfer   price  for  such  Critical   Reagents  had  such  Reagents  been
manufactured  and delivered by Ostex,  less a deduction  equal to Hologic's COGS
therefor,  provided  that  if such  COGS  exceeds  the  transfer  price  and the
resultant number is a negative  number,  Hologic shall take a credit against any
amounts due to Ostex pursuant to SECTION 7.4 of this Agreement.

                           2.2.3    Any  license  granted  pursuant  to the  
option of this  SECTION  2.2 shall be  revocable  by Ostex upon ninety (90)
days prior notice  accompanied by  demonstration  by Ostex that it has recovered
the  manufacturing  capacity to resume supply of Hologic's  anticipated needs as
forecasted  pursuant  to SECTION  6.3.1  hereof  (provided,  however,  that such
license  may be  revoked  no  sooner  than six (6)  months  following  Hologic's
exercise  of  the  option,  and  upon  reasonable  agreement  as to  appropriate
phase-out of Hologic production,  phase-in of Ostex production,  and coverage of
any Hologic start-up and termination  costs,  whereupon  Hologic will again have
available  to it, in the event of  subsequent  default by Ostex as  described in
SECTION 6.3.3, a license option under this SECTION 2.2.

                  2.3      EXPRESS  RESERVATION  OF  RIGHTS.  The  scope of  
     license  granted by Ostex to Hologic  hereunder  is limited by the scope of
the express grants set forth in this SECTION 2. Without  limiting the generality
of the foregoing:

                           2.3.1    RIGHTS  SPECIFICALLY  EXCLUDED  FROM SCOPE 
     OF GRANT TO HOLOGIC.  Ostex  retains all rights in the WRF Bone  Resorption
Technology and Ostex Intellectual Property Rights,  including without limitation
all rights with respect to all products,  applications,  fields of use,  markets
and  uses,  that are not  expressly  included  within  the scope of the grant of
rights to Hologic as set forth in this Agreement. This Agreement shall not under
any circumstances be construed or interpreted to provide for the grant, license,
or any  other  transfer  to  Hologic  or  Serex  of any  rights  in the WRF Bone
Resorption Technology, other than the right to use Critical Reagents supplied by
Ostex hereunder within the scope of the license as granted in this SECTION 2.

                           2.3.2    HOLOGIC AND SEREX.  Hologic and Serex shall
     retain  their  respective  ownership  and  control of all Hologic and Serex
Intellectual  Property Rights and other proprietary  rights and interests in and
relating to the SARA Format, meter technology, and PLP Assay.

                           2.3.3    ACTIONS  REQUIRING  OSTEX'S PRIOR WRITTEN  
     CONSENT.  Hologic shall not, without Ostex's prior written  consent,  which
consent may be  withheld  at Ostex's  sole  discretion,  manufacture  or use any
Critical  Reagent  other than as  provided  for within the scope of the  license
grants as set forth in this SECTION 2.

                           2.3.4    COMPULSORY  LICENSES.  Ostex and  Hologic 
     acknowledge  that the Ostex  Patent  Rights  are  subject to the rights and
limitations  of United  States Code,  Title 35,  Chapter 18, and  administrative
regulations thereunder, and equivalents thereof in other jurisdictions, and that
the grants of  licenses  under  SECTION 2 above are  subject to such  rights and
limitations.  In the event  that Ostex  receives  notice  that any  governmental
agency in any country or territory  having valid authority and  jurisdiction has


<PAGE>

granted,  or intends to grant or to cause to be granted,  a  compulsory  license
with  respect to all or any portion of the Ostex Patent  Rights,  Ostex shall so
notify  Hologic and shall grant that third party a license to exercise the Ostex
Patent Rights to the extent required by the  governmental  agency.  The grant of
such  license  to a third  party or the  taking of rights by or on behalf of any
government shall under no circumstances be considered a breach of this Agreement
by Ostex,  provided  that Hologic shall be deemed to have received an equivalent
license under the same terms and conditions.

                  2.4 OSTEX RIGHT TO DISTRIBUTE NTX METER SYSTEM. Hologic hereby
grants to Ostex and its  Affiliates  for the term of this  Agreement,  and Ostex
hereby  accepts,  a nonexclusive,  nontransferable  license in and under Hologic
Intellectual  Property Rights,  to market,  promote,  sell,  distribute and have
marketed, promoted, sold and distributed under Ostex's trademarks in any country
in the World,  the NTx Meter System all in return for the Hologic rights set out
herein.

         3.       SUPPLY OF CRITICAL REAGENTS.

                  3.1.  CRITICAL REAGENTS FOR DEVELOPMENT OF NTX METER STRIP(S).
Ostex shall supply to Hologic and to its designee,  Serex,  without charge, such
reasonable  quantities of Critical  Reagents as shall be necessary or useful for
the  purpose  of  developing  NTx  Meter  Strip(s)  pursuant  to the  terms  and
conditions of this Agreement, together with such reasonable consulting advice as
Hologic or Serex may request.

                  3.2 CRITICAL  REAGENTS FOR  MANUFACTURING  NTX METER STRIP(S).
Ostex  shall  sell  to  Hologic  (or  such   manufacturer(s)  as  Hologic  shall
designate),  and Hologic (or said  manufacturer(s))  shall  purchase from Ostex,
Critical  Reagents for the purpose of manufacturing  NTx Meter Strip(s) pursuant
to the terms and conditions of this Agreement.

                           3.2.1    Hologic  or its  designated  manufacturer(s)
     shall pay Ostex a  non-royalty  transfer  price for Critical  Reagents sold
pursuant to this SECTION 3 equal to Ostex' COGS therefor.

                           3.2.2    Payment for each shipment of Critical  
     Reagents shall be made by Hologic or its designated  manufacturer(s) within
30 days of the date of invoice,  it being agreed that such invoice  shall not be
dated prior to shipment of the Critical  Reagents to which such invoice relates.
In the event that Hologic or its designated manufacturer(s) fails to comply with
the payment terms of this SECTION 3, Ostex shall have the right,  in addition to
all other rights available under this Agreement,  to suspend further shipment of
Critical Reagents until such breach is cured.

                  3.3 THIRD-PARTY MANUFACTURING ON BEHALF OF OSTEX. In the event
that  Ostex  licenses  a third  party to  manufacture  Critical  Reagents  to be
supplied  under this  Agreement,  Ostex  shall  ensure and  provide  evidence to
Hologic  demonstrating  that such  third-party  manufacturer  complies with good
manufacturing  practices  (GMP)  and  all  applicable  governmental  regulations

<PAGE>

relating  thereto and is either in compliance with or working toward  compliance
with  the  quality  standards   established  by  the   International   Standards
Organization,  Rules 9000 et seq. and  amendments  or  successors  thereto ("ISO
9000").

                  3.4  PRODUCT  WARRANTY;  QUALITY  CONTROL.  Ostex  warrants to
Hologic and its designated  manufacturer(s)  that all Critical  Reagents sold by
Ostex hereunder shall (i) comply with the  specifications  set out in ATTACHMENT
3.4 hereof when used in accord with Ostex  instructions  for use, and amendments
thereto as mutually  agreed upon by the  parties,  (ii) be free from  defects in
material,  workmanship  and design,  and (iii) comply with all applicable  laws,
rules and  regulations  related  to the  manufacture  and  distribution  of such
product (to the extent  applicable  to a  manufacturer).  Without  limiting  the
generality  of  the  foregoing,   Ostex  warrants  that  all  Critical  Reagents
manufactured  and supplied  for the United  States  market under this  Agreement
shall  be  manufactured,   tested,  documented,  packaged,  and  transported  in
compliance with GMP requirements of the FDA including,  without  limitation,  21
CFR Part 820 and any  amendments  or successors  thereto;  and that all Critical
Reagents manufactured and supplied under this Agreement,  regardless of intended
market, shall be manufactured,  tested, documented,  packaged and transported in
compliance with Hologic's  reasonable  quality assurance  requirements.  Hologic
shall have the right to audit and inspect Ostex  facilities,  books, and records
to confirm such compliance.  Ostex further  represents that it is working toward
compliance with the quality standards  established by ISO 9000 and warrants that
it will comply with such standards when legally  required to do so. In the event
that Hologic or its designated  manufacturer(s)  demonstrates within one year of
receipt that any Critical Reagent  supplied  pursuant to this Agreement fails to
meet these specifications and warranties,  Ostex shall, as Hologic's sole remedy
for such failure,  immediately replace said product  (demonstrated by Hologic or
its  designated   manufacturer(s)  as  non-conforming  in  accord  with  Ostex's
reasonable  standard  procedures)  with  product  which  conforms  to the  above
specifications and warranties. These warranties shall not apply to any item that
is subjected to abuse,  stress,  or misuse;  or used in any manner  inconsistent
with applicable Ostex instructions.

                  3.5      DELIVERY.  All  Critical  Reagents  purchased  
under  this  Agreement  shall be  shipped F.O.B. Origin.

                  3.6 INVENTORY.  At all times during the  distribution  term of
this Agreement, Ostex shall supply and Hologic or its designated manufacturer(s)
shall keep  sufficient  inventory of Critical  Reagents to carry out  reasonable
demand or orders for NTx Meter Strip(s) without undue delay.

                  3.7 FACILITIES STANDARDS. At all times during the term of this
Agreement,  Hologic and its designated manufacturer(s) shall provide or cause to
be provided such warehousing and transport  facilities as are both  commercially
reasonable and adequate under the applicable regulations,  product requirements,
and industry standards of all relevant jurisdictions under this Agreement.

         4.  PRODUCT  MANAGEMENT  COMMITTEE.  Within  thirty  (30)  day  of  the
Effective Date, the parties shall form a Product Management Committee consisting

<PAGE>

of two (2) named  representatives each from Hologic and Ostex respectively,  and
one (1) named representative (non-voting) from Serex, which committee shall have
the   responsibility   to  oversee  and   coordinate   development,   marketing,
promotional,  Sales, and distribution  efforts and other activities  required or
permitted by this Agreement respecting the NTx Meter System. The committee shall
meet at least once per  quarter,  at  locations  and at times to be agreed,  and
shall undertake the responsibilities  set out in this Agreement,  as well as the
obligation  to  regularly  review  development   status,   marketing  and  sales
forecasts,  actual sales performance,  competitive  activities,  and promotional
plans.  The committee  shall attempt to operate by consensus,  and shall take no
action  without  approval of a majority of voting  members.  The  committee  may
delegate certain of its functions to subcommittees or individual  members.  Each
party  shall  cause its members to work  diligently  to promote  the  commercial
success of the NTx Meter  System.  Either  party may change its  representatives
assigned to said committee by fifteen (15) days advance  written notice provided
pursuant to SECTION 21 of this Agreement.

         5.       ROLE OF THE PARTIES IN THE DEVELOPMENT AND REGULATORY APPROVAL
                  OF THE NTX METER SYSTEM.

                  5.1 GOALS. The parties have established the development  goals
set out  herein,  which  goals are  anticipated  to be  accomplished  within the
general time periods set out therein, as said development goals may be specified
in more detail or amended from time to time, provided that Hologic shall use and
shall cause Serex to use its best commercial efforts to complete  development of
the    NTx    Meter    System    and    to    obtain     regulatory     
approval thereof for XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

                  5.2  CONSULTATION  AND  AVAILABILITY OF OSTEX  KNOW-HOW.  Each
party shall perform the activities  assigned to it, and shall make available key
employees to provide consultation,  advice, assistance, and scientific direction
in  furtherance  of the  objectives  of this  Agreement.  Without  limiting  the
generality of the foregoing,  Ostex shall make available to Hologic and to Serex
personnel trained in and knowledgeable of the WRF Bone Resorption Technology and
performance  characteristics  of the NTx Assay  Technology.  Except as otherwise
specifically provided in this Agreement, each party shall bear its own costs and
expenses associated with all facilities, materials, and employee time devoted to
this effort.  Neither  party shall be obligated to disclose  their  Confidential
Information to the other,  except to the extent necessary for the performance of
each party's obligations under this Agreement.

                  5.3 SEREX  ROLE.  Hologic  shall  cause  Serex to use its best
commercial efforts,  pursuant to the Hologic/Serex  Agreement,  to (a) integrate
the Ostex NTx Assay  Technology  to work with the SARA  Format to create the NTx
Meter  Strip;  (b)  cooperate  with  Hologic to develop  the NTx Meter;  and (c)
cooperate  with  Hologic  and Ostex in the  conduct of  clinical  trials and the
obtaining of regulatory approvals for the NTx Meter System as a whole.

                  5.4      HOLOGIC  ROLE.  Pursuant to the  Hologic/Serex  
     Agreement,  Hologic shall (a) cooperate with Serex in connection  with, and
continue     to    fund,     development     of    the    NTx    Meter     Strip

<PAGE>

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;
(b)    arrange,    manage    and   fund    development    of   the   NTx   Meter
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;    and   (c)
arrange,  manage,  and fund  conduct of  clinical  trials and the  obtaining  of
regulatory   approvals   for   the   NTx   Meter   System    XXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

                  5.5.     OSTEX ROLE.

                           5.5.1    GENERALLY.  Pursuant to  SECTIONS  2.1 and 
                                    3.1 of this  Agreement,  Ostex shall
                                    ---------                -------------    
(a) provide the license and Critical Reagents specified  therein;  (b) cooperate
with Hologic to develop the NTx Meter and (c)  cooperate  with Hologic and Serex
in the conduct of clinical trials and the obtaining of regulatory  approvals for
the NTx Meter System.

                           5.5.2    OSTEX FUNDING.  In addition, Ostex shall 
reimburse Hologic for XXXXXXXXXXXX of Hologic's funding paid out
in support of Serex's development  efforts, Meter  
development,  support of clinical  trials and regulatory  approval,  upon
receipt  of  Hologic's  invoice  to Ostex for the  previous  calendar  quarter's
expenses, to a maximum of XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
(the "Maximum Cost") which is one-hundred ten percent (110%) of the total of the
amounts set out in SECTION 5.4 above.  If at any time,  it appears that the cost
of the Serex  development  effort  for the NTx Meter  System  will  exceed  said
Maximum Cost, the parties will meet and use their best efforts to negotiate,  in
good faith, an appropriate
agreement  to allocate  any such  excess.  Failing  agreement,  either party may
terminate this Agreement  without  penalty upon thirty (30) days advance written
notice to either  party,  provided  that the other  party may agree  during such
notice period to reimburse the entire excess,  in which case  royalties  payable
pursuant  to  SECTIONS  7.3 and 7.4 shall be  adjusted  to reflect  the  overall
percentage of funding paid by each party during the period beginning  January 1,
1997.

                           5.5.3    ACCESS TO  CLINICAL  DATA.  Ostex  shall 
     provide  Hologic and Serex with full access to all clinical  trial data and
regulatory submissions, and make available all urine samples, collected by Ostex
that pertain to the NTx Assay  Technology  and to the  activities of Hologic and
Serex under this Agreement.  It is acknowledged  that such  information  will be
subject to the  confidentiality  provisions set out in this Agreement as well as
confidentiality  provisions  necessary  to protect  patient  privacy;  provided,
however, that such information may, as necessary and appropriate, be transmitted
to proper  regulatory  authorities in connection  with the seeking of regulatory
product approvals.
                           5.5.4.   TECHNICAL   SUPPORT.   Ostex  shall  assist
  Hologic  and  Serex,  at  either's
reasonable request, in the technical training of a mutually determined number of

<PAGE>

Hologic  and/or  Serex's  employees,  such  training  to  include  provision  of
information as to the nature, use and proper care of Critical Reagents. Any such
training shall be provided at Ostex's  principal place of business,  and Hologic
shall be solely responsible for all costs of transportation,  lodging, and other
expenses of trainees incidental to such training.  During the term hereof, Ostex
shall use its commercially  reasonable efforts to respond to technical questions
or problems  which may arise from time to time in  connection  with the Critical
Reagents, WRF Bone Resorption Technology and Ostex Intellectual Property.

         6.       ROLE OF THE PARTIES IN MANUFACTURE AND COMMERCIALIZATION 
                  OF NTX METER TEST.

                  6.1  MANUFACTURING.  Pursuant to the Hologic/Serex  Agreement,
Hologic shall,  within a reasonable time period following FDA approval,  develop
the  capacity  to  manufacture  or  have  manufactured   reasonable   commercial
quantities of the NTx Meter and NTx Meter Strips.  Hologic may have Serex and/or
third parties  manufacture and package the NTx Meter Strips  (provided that they
have agreed to be bound by the terms of this Agreement, including its provisions
relating  to  confidentiality),  and may  manufacture  the NTx  Meter  itself or
utilize third parties to do so,  provided that Hologic shall first furnish Ostex
with evidence  demonstrating  any such third party's  capability to  manufacture
such  NTx  Meter  Strips  or NTx  Meters  pursuant  to GMP  and  all  applicable
regulatory requirements.

                  6.2  COMMERCIALIZATION.  Six months  prior to the  anticipated
First Commercial Sale of NTx Meter Systems under this Agreement, but in no event
longer than 24 months from the  effective  date of this  Agreement,  Hologic and
Ostex,  acting  through  the  Product  Management  Committee,  shall  agree on a
marketing  plan for said NTx Meter  Systems for the  following  twelve months (a
"Marketing Year") that will be appended to this Agreement as ATTACHMENT 6.2. The
parties anticipate that such Attachment will cover marketing activities and will
require each party to spend, individually, XXXXXXXXXXXXXXXXXXXXXX of anticipated
total Gross Sales by both  parties  together of NTx Meter  Strips and NTx Meters
for such year (as this number is determined by the Product Management Committee)
on marketing activities  therefor.  The Product Management Committee shall agree
on a new marketing  plan for each  subsequent  Marketing Year during the term of
this Agreement; provided that such marketing plan shall not require either party
to spend XXXXXXXXXXXXXXXXX of that party's individual Gross Profit received
from its Sales of NTx Meter Systems during the immediately  preceding  Marketing
Year (not including royalties received from the other party pursuant to SECTIONS
7.3 or 7.4 hereof), provided further that if the Product Management Committee is
not able to agree on a marketing plan for any such  subsequent  Marketing  Year,
the  marketing  plan  (including  budgetary  allocations)  for  the  immediately
preceding  Marketing Year shall be repeated with expenditures  equivalent to the
dollar  expenditures of such preceding  Marketing Year. If either party does not
spend the amount so designated  pursuant to the marketing plan for any Marketing
Year of this  Agreement,  the other party shall, in addition to any other remedy
provided under this  Agreement,  be entitled to take a credit against  royalties
payable by it for the subsequent Marketing Year equal to the shortfall. Said

<PAGE>

Product Management  Committee will also establish for each Marketing Year of the
term a  designated  quantity of NTx Meter  Strips to be  purchased by each party
pursuant to this Agreement,  and distributed as  "promotional  samples"  without
customer  charge,  and without royalty to either party.  For the first Marketing
Year, the parties expect to designate not less than 30% of the  anticipated
production of NTx Meter Strips as such "promotional  samples" provided that this
percentage may be revised by the Product Management Committee in light of market
conditions and strategy, allocated 50% to each party or as otherwise agreed.

                  6.3  Supply of  Critical  Reagents.  Ostex  shall use its best
commercial   efforts  to  supply  the  need  of  Hologic   and  its   designated
manufacturer(s)  for  Critical  Reagents as necessary to meet the demand for NTx
Meter Systems, in accordance with purchase orders received by Ostex from Hologic
and its designated manufacturer(s), and in SECTIONS 6.3.1 AND 6.3.2 below.

                           6.3.1    FORECAST OF DEMAND.  Within sixty days of 
     the  start  of  each   calendar   quarter,   Hologic   or  its   designated
manufacturer(s)  shall  deliver to Ostex a "rolling"  forecast of  quantities of
Critical Reagents to be purchased by Hologic and its designated  manufacturer(s)
and supplied by Ostex during each month of the  following  quarter,  and each of
the subsequent  three quarters (the "Rolling  Forecast").  Each Rolling Forecast
shall be considered a purchase order with respect to the  forecasted  demand for
Critical Reagents over the first three months thereof. The forecasted demand for
the first  subsequent  quarter  shall be relied on by Ostex for  purposes of its
manufacturing and supply obligations  hereunder,  but Hologic and its designated
manufacturer(s)  may vary from its initial  forecast for such quarter by no more
than twenty-five percent (25%). The forecasted demand for the final two quarters
of each  Rolling  Forecast  shall be used by Ostex for  planning  purposes,  but
Hologic  and its  designated  manufacturer(s)  shall not be bound by its initial
forecast(s),  nor shall Hologic or its designated  manufacturer(s)  be liable to
Ostex with respect to any changes thereto.

                           6.3.2  ALLOCATION  OF  PRODUCTION.  In the event 
     that Ostex does not meet the demand for Critical  Reagents ordered pursuant
to SECTION 6.3.1,  Ostex shall allocate overall  production of Critical Reagents
(whether   manufactured   or  purchased,   and  whether  for  Ostex's   internal
manufacturing or for Sale) such that Hologic and its designated  manufacturer(s)
receives  the same  proportion  of the amount of the  Critical  Reagents  it has
ordered  (pursuant  to  SECTION  6.3.1  hereto)  as Ostex  allocates  to its own
manufacture of products utilizing the NTx Assay Technology,  or to its otherwise
most favored non-end-user customer, whichever proportion is greater (measured as
a proportion  of total units of  production),  provided  that Ostex shall not be
required to sell to Hologic  and its  designated  manufacturer(s)  any more than
thirty percent (30%) of its total  production of any Critical Reagent during any
quarter.

                           6.3.3    EXERCISE  OF  MANUFACTURING  OPTION.  In 
the event  that Ostex does not for any
reason,  for a period of thirty (30) days, meet (through internal or third-party
manufacture),  Hologic's demand for Critical  Reagents which comply with SECTION
3.4 hereof, ordered pursuant to SECTION 6.3.1 hereof, Hologic shall be entitled,
upon  fifteen (15) days written  notice,  to exercise the option to  manufacture
such Critical Reagents  described in SECTION 2.2 hereof. Any Hologic exercise of
said option shall not relieve Ostex of its obligations  pursuant to this SECTION
6.3.  Upon any Hologic  exercise of said option,  Ostex shall provide to Hologic
subject  to the  provisions  of SECTION 10 of this  Agreement,  all  information

<PAGE>

necessary to so manufacture such Critical Reagents,  provided that Hologic shall
not disclose to Serex any  Confidential  Information  so  disclosed  without the
prior written approval of Ostex which approval may be conditioned or withheld at
Ostex's sole discretion.

                  6.4  PUBLICATIONS.  Each party shall,  throughout  the term of
this Agreement,  use its continuing  commercially  reasonable efforts to develop
documentation and publish scientific articles directly or indirectly  supporting
the  clinical  utility  of the  NTx  Meter  System.  Such  publications  will be
submitted to the other party for review and approval prior to  publication,  and
shall be subject to the requirements of SECTION 16.2 hereof regarding the use of
trademarks.

         7.       ROLE OF THE PARTIES IN THE SALES OF THE NTX METER TEST.

                  7.1 The parties'  general  agreement is that Hologic and Ostex
shall each sell NTx Meter Strips and NTx Meters as they see fit, and shall share
the  profits  associated   therewith  in  accord  with  the  reciprocal  royalty
mechanisms more specifically described in this Section.

                  7.2 OSTEX  PURCHASE  OF NTX METER  STRIPS AND  METERS  Hologic
shall use its  commercially  reasonable  efforts  to supply the need of Ostex to
meet the demand for NTx Meter Strips and NTx Meters, in accordance with purchase
orders  received  by Hologic  from  Ostex,  and in  accordance  with the rolling
forecast  and  allocation  provisions  specified  in Sections  7.2.10 and 7.2.11
below.

                           7.2.1    Ostex shall pay Hologic a non-royalty  
transfer  price for NTx Meter Strips and
NTx Meters sold pursuant to this Section equal to XXXXXXXXXXXXXXX  therefor
(including  any extra  charge  for  Ostex-requested  modifications  to  standard
packaging as may be agreed).

                           7.2.2    Payment for each  shipment of NTx Meter  
Strips and NTx Meters shall be made by
Ostex  within 30 days of the date of invoice,  it being agreed that such invoice
shall not be dated prior to  shipment of the NTx Meter  Strips and NTx Meters to
which such invoice relates.

                           7.2.3    THIRD-PARTY  MANUFACTURING  ON BEHALF OF  
HOLOGIC.  In the event  that  Hologic
licenses  a third  party to  manufacture  NTx Meter  Strips or NTx  Meters to be
supplied  to Ostex  under this  Agreement,  Hologic  shall  ensure  and  provide
evidence to Ostex demonstrating that such third-party manufacturer complies with
good manufacturing practices (GMP) and all applicable  governmental  regulations
relating  thereto and is either in compliance with or working toward  compliance
with  the  quality  standards   established  by  the   International   Standards
Organization,  Rules 9000 et seq. and  amendments  or  successors  thereto ("ISO
9000").

                           7.2.4    PRODUCT WARRANTY; QUALITY CONTROL. Hologic 
warrants to Ostex  that all NTx
Meter Strips and NTx Meters sold by Hologic to Ostex  hereunder shall (i) comply
with the product specifications attached hereto as ATTACHMENT 7.2.4 when used in
accord with applicable Hologic instructions,  as modified by mutual agreement of
the parties, (ii) be free from defects in material,  workmanship and design, and
(iii) comply with all  applicable  laws,  rules and  regulations  related to the

<PAGE>

manufacture  and  distribution  of such product (to the extent  applicable  to a
manufacturer).  Without  limiting  the  generality  of  the  foregoing,  Hologic
warrants that all NTx Meter Strips and NTx Meters  manufactured and supplied for
the United States market under this  Agreement  shall be  manufactured,  tested,
documented, packaged, and transported in compliance with GMP requirements of the
FDA  including,  without  limitation,  21 CFR  Part  820 and any  amendments  or
successors  thereto;  and that all NTx Meter Strips and NTx Meters  manufactured
and supplied  under this  Agreement,  regardless  of intended  market,  shall be
manufactured,  tested,  documented,  packaged and transported in compliance with
appropriate quality assurance requirements agreed to by the parties. Ostex shall
have the right to audit and inspect Hologic  facilities,  books,  and records to
confirm such  compliance.  Hologic  further  represents  that is working  toward
compliance with the quality standards  established by ISO 9000 and warrants that
it will comply with such standards when legally  required to do so. In the event
that Ostex  demonstrates  within one year of receipt  that any product  supplied
pursuant to this Agreement  fails to meet these  specifications  and warranties,
Hologic  shall,  as Ostex's sole remedy for such  failure,  replace said product
(returned  by Ostex to the factory  pursuant to  Hologic's  reasonable  standard
return  procedures) with product which conforms to the above  specifications and
warranties,  provided  that Hologic  shall not be obligated to replace NTx Meter
Strips distributed as "Promotional Samples" which pass Hologic quality assurance
tests and comply  with all FDA and other  governmental  regulations  relating to
such Promotional  Samples.  These warranties shall not apply to any item that is
subjected to abuse,  stress, or misuse; or used in any manner  inconsistent with
applicable  Hologic  instructions;  or insofar as any such warranty violation is
caused by Ostex's violation of its warranties set out in SECTION 3.4 hereof.

                           7.2.5    CUSTOMS  AND  TAXES.  With  respect  to  
international  shipments  of any goods
purchased, sold, distributed, or otherwise transferred hereunder,  including the
Critical  Reagents,  the purchasing  party shall be responsible for clearing all
such goods through customs and shall pay any and all taxes and/or duties imposed
by any governmental authority in connection therewith.

                           7.2.6    DELIVERY.  All NTx Meter  Strips and NTx 
Meters  purchased  by Ostex under this
Agreement shall be shipped FOB manufacturer's dock.

                           7.2.7    INVENTORY.  At all  times  during  the  
distribution  term of  this  Agreement,
Hologic  shall  supply and Ostex shall keep  sufficient  inventory  of NTx Meter
Strips and NTx Meters to carry out reasonable demand for orders therefor without
undue delay.

                           7.2.8    FAILURE OF  PAYMENT.  In the event that 
Ostex  fails to comply with the payment
terms of this Section,  Hologic  shall have the right,  in addition to all other
rights available under this Agreement,  to suspend further shipment of NTx Meter
Strips and NTx Meters until such breach is cured.

                           7.2.9    FACILITIES  STANDARDS.  At all times 
during the term of this  Agreement,  Ostex
shall provide or cause to be provided such warehousing and transport  facilities
as  are  both   commercially   reasonable  and  adequate  under  the  applicable
regulations,  product  requirements,  and  industry  standards  of all  relevant
jurisdictions under this Agreement.


<PAGE>

                           7.2.10   FORECAST OF DEMAND.  Within thirty days of
the start of each calendar  quarter,
Ostex shall  deliver to Hologic a "rolling"  forecast of the  quantities  of NTx
Meter  Strips and NTx Meters to be  purchased  by Ostex and  supplied by Hologic
during each month of the following  quarter,.  and each of the subsequent  three
quarters (the `Rolling  Forecast").  Each Rolling Forecast shall be considered a
purchase  order with respect to the  forecasted  demand for NTx Meter Strips and
NTx Meters over the first three months  thereof.  The forecasted  demand for the
first  subsequent  quarter  shall be relied on by Hologic  for  purposes  of its
manufacturing  and  supply  obligations  hereunder,  but Ostex may vary from its
initial forecast for such quarter by no more than twenty-five percent (25%). The
forecasted  demand for the final two quarters of each Rolling  Forecast shall be
used by  Hologic  for  planning  purposes,  but Ostex  shall not be bound by its
initial  forecast(s),  nor shall Ostex be liable to Hologic  with respect to any
changes thereto.

                           7.2.11   ALLOCATION  OF  PRODUCTION.  In the event 
that Hologic does not meet the demand
for NTx Meters or NTx Meter Strips ordered  pursuant to SECTION 7.2.10,  Hologic
shall  allocate  overall  production  thereof such that Ostex  receives the same
proportion  of the amount of the NTx Meters and NTx Meter  Strips it has ordered
(pursuant to SECTION 7.2.10 hereto) as Hologic allocates for its direct sale, or
to its otherwise most favored  non-end-user  customer,  whichever  proportion is
greater  (measured as a proportion of total units of production),  provided that
Hologic  shall not be required to sell to Ostex and any more than fifty  percent
(50%) of its total production during any quarter.

                  7.3 OSTEX ROYALTY ON SALES OF NTX METER STRIPS AND NTX METERS.
Subject to the terms of SECTION  7.5  hereof,  Ostex shall pay to Hologic a
royalty             equal             to             XXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.  Ostex  shall  make the  royalty
payments  required by this Section not later than  forty-five (45) calendar days
following  the end of each  calendar  quarter.  At such time,  Ostex  shall also
provide  Hologic with a full  accounting of units disposed of, Gross Sales,  Net
Sales, COGS, and Gross Profits attributable thereto for said quarter.

                  7.4  HOLOGIC  ROYALTY  ON SALES OF NTX  METER  STRIPS  AND NTX
METERS.  Subject  to  the  terms  of  SECTION  7.5  hereof,  Hologic  shall  pay
to    Ostex    a     royalty     equal     to     XXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX., provided that Hologic shall not
be required to make any royalty  payment  with  respect to  dispositions  of NTx
meter technology  incorporated  into or sold as a package with or part of, other
Hologic equipment, XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.  Hologic shall make the
royalty  payments  required  by this  Section  not later  than  forty-five  (45)
calendar days following the end of each calendar quarter.  At such time, Hologic
shall also  provide  Ostex with a full  accounting  of units  disposed of, Gross
Sales, Net Sales, COGS, and Gross Profits attributable to its Sales of NTx Meter
Strips,  NTx Meters,  and NTx meter technology (but not other Hologic  equipment
into which said technology may be incorporated or packaged) for said quarter.

                  7.5  ADJUSTMENT TO  ROYALTIES.  Following the end of the first
year period  beginning with the First  Commercial Sale, and each subsequent year

<PAGE>

period,  if either  party's  Gross Sales of NTx Meter  Strips for the prior
year period was not equal to or greater than XXXXXXXXXXX XXXXXXXXXXXXXXX by both
parties of such NTx Meter Strips,  the royalty  payable on said NTx Meter Strips
for the  following  year  period by "the party with the larger  Sales"  shall be
adjusted  downward  by  XXXXXXXXXXXXXXXXXXXX  that the total  Sales of NTx Meter
Strips by  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  of such NTx Meter Strips, unless
"the party with the larger Sales" waives this adjustment.

                  7.6 SERIOUS INJURY.  Each party shall within twenty-four hours
advise the other by telephone,  (with follow-up hard copy, receipt confirmed) of
any adverse  effect or  malfunction  related to the NTx Meter  Strips or the NTx
Meter or the Critical Reagents  (whether  incorporated in NTx Meter Strips or in
any other product, including but not limited to the OsteomarkAE Laboratory Test)
of which the notifying party gains  knowledge  during the term of this Agreement
that may have caused or contributed  to, or should it reoccur is likely to cause
or contribute to, serious injury,  illness,  or death. The notifying party shall
include in the  notification  the name,  address,  and  telephone  number of the
person or entity  purchasing  the product in question,  the name,  address,  and
telephone of the patient (if different), and the lot or serial number of the NTx
Meter Strip or NTx Meter involved in the incident, as appropriate.

                  7.7 PRODUCT  RECALL.  If either party  believes that a product
recall is necessary or appropriate,  it will promptly notify the other,  and the
parties will (unless such recall is required by law) discuss whether such recall
is necessary or appropriate, and shall discuss the manner in which any agreed or
required  recall shall be conducted.  If a recall is not required by law and the
parties  cannot agree  whether the recall is necessary  or  appropriate,  either
party may elect to conduct the recall in question  The parties  shall  cooperate
with each other in  conducting  any such  recall.  All out of pocket  costs of a
required or agreed recall  insofar as such recall  relates to Critical  Reagents
(except printing and mailing costs incurred to notify customers of such recall),
shall be borne by Ostex.  All out of pocket costs of a required or agreed recall
except  insofar as such  recall  relates to  Critical  Reagents or the NTx Assay
Technology ( except  printing and mailing costs incurred to notify  customers of
such  recall),  shall be borne by  Hologic.  All  costs of a recall to which the
parties  have not agreed  shall be borne by the party that elects to conduct the
recall,  provided that if a court of competent jurisdiction determines that said
recall was caused by (i) the fact that any  Critical  Reagents  or the NTx Assay
Technology  were in violation of applicable  law or the terms of this  contract,
Hologic may obtain  reimbursement by Ostex of all reasonable out of pocket costs
and expenses of such recall  (except for printing and mailing costs  incurred to
notify  customers  of such  recall),  or (ii) the fact that any NTx Meter or NTx
Meter  Strip(s) were  otherwise in violation of  applicable  law or the terms of
this contract,  Ostex may obtain  reimbursement by Hologic of all reasonable out
of pocket  costs and  expenses of such recall  (except for  printing and mailing
costs  incurred to notify  customers of such recall.  Each party shall  maintain
complete  and  accurate  records of all product  sold by it for such  periods as
required by law.  Nothing in this Section  shall be construed to modify or limit
any legal obligation of either party with respect to any recall.

                  7.8  CORRECTIVE   ACTION.   If  any  government   agency  with
jurisdiction  shall request or order any  corrective  action with respect to any
Critical Reagent, or NTx Meter or NTx Meter Strips, including but not limited to

<PAGE>

any recall, customer notice, restriction, change, market action, or modification
of the product in question, and the cause or basis for such corrective action is
primarily  attributable  to a condition,  fact, or action that (i) constitutes a
breach  by a  party  of any  of its  warranties,  representations  or  covenants
contained  herein,  or (ii) a party knew or should have known would require such
corrective  action;  then such party shall be liable for and shall reimburse the
other  party  for all  costs  incurred  as a result  of such  action,  including
replacement cost of any product affected thereby.

         8.  BOOKS AND  RECORDS;  AUDITS.  Each  party to this  Agreement  shall
maintain  accurate  books and records with respect to all Critical  Reagents and
NTx Meters and NTx Meter Strips. Upon the request of the other party, each party
will provide the requesting  party or its  independent  public  accountant  with
access,  but no more than once per calendar year,  during regular business hours
and upon reasonable advance prior notice, to all accounting records necessary or
appropriate to verify amounts owed.  Any  adjustment  determined  appropriate by
such audit shall be due and payable within thirty (30) days following completion
of such audit,  together with  interest  calculated at a rate equal to the prime
lending rate reported in the Wall Street Journal for the last day of the audited
period plus two percent (+2%), or the maximum interest rate then permitted under
the laws of  Massachusetts,  whichever  rate is lower.  All fees for such audits
shall be borne by the requesting party unless the audit shows an under reporting
of amounts  due of five  percent  (5%) or more,  in which case the costs of said
audit shall be borne by the party being audited.

         9. OWNERSHIP OF  DISCOVERIES.  It is the intent of the parties that the
ownership of any and all Discoveries  resulting from this Agreement,  regardless
of inventorship,  shall: (a) vest solely in Ostex to the extent that such rights
relate exclusively to the NTx Assay Technology;  and (b) vest solely in Serex to
the extent that such rights relate  exclusively to the SARA Format or adaptation
of the NTx Assay Technology for use with the SARA Format; and (c) vest solely in
Hologic to the extent that such rights  relate  exclusively  to the NTx Meter or
use of NTx Meter  Strips with the NTx Meter;  and (d) in all other cases vest in
the party or parties of the inventor.

         10.  OBLIGATION  NOT TO DISCLOSE  CONFIDENTIAL  INFORMATION.  Recipient
shall not at any time,  and shall cause  Serex (in the case of Hologic)  and its
permitted  assigns and  sublicensees (in the case of either party) to commit not
to at any time for a period of seven (7) years following the termination of this
Agreement,  disclose or otherwise  make known or available to any person,  firm,
corporation,  or other entity other than Discloser any Confidential  Information
received from the other party without the express prior written  consent of that
other  party.  With respect to  Confidential  Information  developed  under this
Agreement and which is not Confidential  Information of one party only,  neither
party shall disclose or otherwise make such  Confidential  Information  known or
available to any person, firm, corporation,  or other entity without the express
prior written  consent of the other party,  not to be  unreasonably  withheld or
delayed. Recipient shall utilize reasonable procedures to safeguard Confidential
Information,   including  releasing  Confidential   Information  only  to  those
employees to whom  disclosure is necessary or  appropriate  for the Recipient to

<PAGE>

undertake  its  responsibility  pursuant  to  this  Agreement.  Nothing  in this
Agreement shall prevent  Recipient from disclosing  Confidential  Information to
government agencies for regulatory purposes.

                  10.1   RECIPIENT'S  OWN  USE  OF   CONFIDENTIAL   INFORMATION.
Recipient shall not make any use,  directly or indirectly,  of any  Confidential
Information  of the other  party  except  in the  ordinary  course  of  business
pursuant to this Agreement or any other specific, written agreement entered into
between Ostex and Hologic.

                  10.2 SPECIFIC  PERFORMANCE.  The parties acknowledge that: (a)
the  covenants  set forth in this  SECTION 10 are  essential  to the  activities
contemplated  by this  Agreement;  (b) but for the  agreement  of each  party to
comply  with  such  covenants,  neither  party  would  have  entered  into  such
activities;  (c) each party has  consulted  with or has had the  opportunity  to
consult  with  counsel  and has been  advised  in all  respects  concerning  the
reasonableness of such covenants as to time and scope; (d) Discloser may have no
adequate  remedy at law if  Recipient  violates  or fails to perform  under this
SECTION  10; and (e)  Discloser  shall have the right,  in addition to any other
rights it may have, to seek from a court of competent  jurisdiction  preliminary
and permanent  injunctive  relief to restrain any breach or threatened breach or
otherwise to specifically enforce Recipient's  obligations under this SECTION 10
if Recipient fails to perform in accordance herewith.

         11. SEREX DEVELOPMENT OF PLP TEST. Both parties  acknowledge that Serex
has developed the PLP Assay,  which  determines  the levels of a peptide  linked
pyridinoline resulting from bone resorption,  under the Hologic/Serex Agreement.
Notwithstanding  any other  provision of this  Agreement,  nothing shall prevent
Serex and/or Hologic from  continuing  this  development or  commercializing  or
selling any results thereof, or from using any information provided or gained as
a result of this Agreement, or any derivative thereof,  including Ostex Know-How
and Confidential Information,  in the course of these activities,  provided that
Hologic and Serex otherwise  comply with the  requirements of SECTION 10 hereof,
and provided always that Serex and Hologic shall not be entitled to use for said
purposes any intellectual  property received  pursuant to Hologic's  election to
manufacture of Critical Reagents pursuant to SECTION 2.2 hereof.  This provision
shall not be  construed  to  provide  Hologic or Serex with any right to use any
Ostex  Patent  Rights  for  any  purpose  not  specifically  permitted  by  this
Agreement, or to extend any Ostex Intellectual Property to cover the PLP Assay.

         12.      TERM AND TERMINATION.

                  12.1 INITIAL LICENSE TERM,  AUTOMATIC RENEWAL.  This Agreement
shall be in full force and effect as of the date  first  written  above and
shall remain in effect  XXXXXXXXXXXXthereafter unless sooner terminated pursuant
to this  Section  12. On the XXXXXX  and  subsequent  anniversaries  of the date
hereof,  the term of this  Agreement  shall  (subject to SECTION  12.5 below) be
automatically  continued  for a period  of  XXXXXXXXXXXXXXXXXXX,  unless  either
Hologic  delivers to Ostex,  or Ostex delivers to Hologic,  at least ninety (90)
days prior to such anniversary date, a written

<PAGE>

notice of its intent to  disengage  for cause  based upon  failure of such other
party to use  commercially  reasonable  efforts toward the achievement of market
objectives  for NTx Meter  Systems,  in light of  factors  to  include,  without
limitation, profits, sales volume, market development, and the capture of market
share. In such event, if the parties are unable through good-faith  negotiations
to agree to terms and conditions for further extension of the term hereof,  this
Agreement and all license rights  granted  hereunder  shall  terminate as of the
anniversary  date to which the notice of intent to  disengage  applies,  without
liability of either party to the other in consequence of such termination.

                  12.2  TERMINATION  BY  OSTEX.  Ostex  shall  have the right to
terminate this Agreement  immediately upon notice in the event that: (a) Hologic
fails to  complete  development  of the NTx Meter or to cause  Serex to complete
development of the NTx Meter Strip in accord with the  specifications set out in
ATTACHMENT 7.2.4 XXXXXXXXXXXXXXXXXXXXXXXXX  XXXXXXXXXXX, or to obtain regulatory
approval       therefor       for      the      United       States       within
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX;  or (b) Hologic materially breaches or fails
to  perform  in a  timely  manner  any of its  material  duties  or  obligations
hereunder, and such breach shall remain uncured, or the failure to perform shall
continue,  for at least  sixty  (60) days after  Ostex has given  notice of such
breach or failure. Without limiting the generality of the foregoing, a "material
breach" or "failure to perform" shall include without limitation, any failure to
remit payments,  or failure to comply with any financial reporting  requirement,
or  failure  to  maintain   Hologic's  rights  pursuant  to  the   Hologic/Serex
Agreement..

                  12.3  TERMINATION BY HOLOGIC.  Hologic shall have the right to
terminate this Agreement  immediately  upon notice in the event that (a) Hologic
fails to  complete  development  of the NTx Meter or to cause  Serex to complete
development of the NTx Meter Strip in accord with the  specifications set out in
ATTACHMENT 7.2.4  XXXXXXXXXXXXXXXXXXXXXXXXX  XXXXXXXX,  or to obtain  regulatory
approval     therefor     for    the     United     States     within     XXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  for any  reason  other  than as a  result  of
Hologic's material breach of its obligations under this Agreement;  or (b) Ostex
has  materially  breached  or failed to  perform  in a timely  manner any of its
material duties or obligations hereunder,  and such breach shall remain uncured,
or the  failure to perform  shall  continue,  for at least sixty (60) days after
Hologic has given  notice of such breach or failure to Ostex.  Without  limiting
the  generality of the  foregoing,  a "material  breach" or "failure to perform"
shall include without limitation,  any failure to remit payments,  or failure to
comply with any financial reporting requirement,  or failure to maintain Ostex's
rights pursuant to the WRF/Ostex Exclusive License Agreement.

                  12.4     TERMINATION FOR TECHNICAL DEFECT.

                           12.4.1   BY OSTEX.  If within ninety (90) days of 
the Effective Date,  Ostex  determines
that a material  technical  deficiency exists in the SARA Format which is likely
to prevent Serex or Hologic from  completing  development  of an NTx Meter Strip
which meets the Product Specifications  described in ATTACHMENT 7.2.4 within the
time  period set out in SECTION  12.2(A)  above,  Ostex  shall  provide a notice
thereof to Hologic which  describes in detail said purported  deficiency and the

<PAGE>

impact thereof on the  specifications  and/or time frame for  development.  Upon
receipt of such notice,  Hologic  shall  conduct a though  review of the subject
matter of said  notice,  provide  to Ostex a detailed  report of how  Hologic or
Serex plan to resolve the issues raised and to meet the relevant  specifications
and/or time frame,  and meet with Ostex to review said report.  If Hologic fails
to provide said report within  fifteen (15) business days  following  receipt of
such notice,  Ostex may within ten business days following the final due date of
such report,  terminate this Agreement upon written notice without  liability of
any sort.

                           12.4.2   BY  HOLOGIC.  If  within  ninety  (90)  
days  of the  Effective  Date,  Hologic
determines  that  a  material  technical  deficiency  exists  in the  NTx  Assay
Technology or Critical Reagents which is likely to prevent Serex or Hologic from
completing   development   of  an  NTx  Meter  Strip  which  meets  the  Product
Specifications  described in ATTACHMENT  7.2.4 within the time period set out in
SECTION  12.2(A)  above,  Hologic shall provide a notice  thereof to Ostex which
describes  in detail said  purported  deficiency  and the impact  thereof on the
specifications  and/or time frame for development.  Upon receipt of such notice,
Ostex  shall  conduct a though  review  of the  subject  matter of said  notice,
provide to Hologic a detailed  report of how Ostex  plans to resolve  the issues
raised and to meet the relevant  specifications and/or time frame, and meet with
Hologic to review  said  report.  If Ostex fails to provide  said report  within
fifteen (15) business days following receipt of such notice,  Hologic may within
ten business days  following the final due date of such report,  terminate  this
Agreement upon written notice without liability of any sort.

                  12.4     BANKRUPTCY OF A PARTY.

                           12.4.1   OSTEX  BANKRUPTCY.  All rights and licenses
  granted  under or pursuant to this
Agreement  by Ostex to Hologic  are,  and shall  otherwise  be deemed to be, for
purpose  of  Section  365(n) of Title 11,  U.S.  Code (the  "Bankruptcy  Code"),
licenses of rights to  "intellectual  property" as defined under Section 101(60)
of the Bankruptcy  Code.  The parties agree that Hologic,  as a licensee of such
rights  under this  Agreement,  shall  retain and may fully  exercise all of its
rights and elections under the Bankruptcy Code.

                           12.4.2   HOLOGIC  BANKRUPTCY.  All rights and
licenses granted under or pursuant to this
Agreement  by  Hologic to Ostex are,  and shall  otherwise  be deemed to be, for
purpose  of  Section  365(n) of Title 11,  U.S.  Code (the  "Bankruptcy  Code"),
licenses of rights to  "intellectual  property" as defined under Section 101(60)
of the  Bankruptcy  Code.  The parties  agree that Ostex,  as a licensee of such
rights  under this  Agreement,  shall  retain and may fully  exercise all of its
rights and elections under the Bankruptcy Code.

                  12.5     RESERVED

                  12.6  MAXIMUM  TERM.  Notwithstanding  any  provision  of this
Agreement to the contrary,  the license granted with respect to the Ostex Patent
Rights  under  SECTION  2 above  shall  terminate  upon  expiration  of the last
remaining Ostex Patent Right.  Upon such expiration,  Hologic shall be deemed to
have a perpetual,  worldwide,  royalty free license to  manufacture,  make, have
manufactured  or made,  use,  market,  sell,  and  distribute  NTx Meter  Strips
worldwide except Japan for any application.


<PAGE>

                  12.7     RIGHTS AND DUTIES UPON TERMINATION.

                           12.7.1   PAYMENTS.  Upon  termination  of this  
agreement,  each party  shall pay to the other all payments that are due 
and have accrued and are outstanding as of the date of termination.

                           12.7.2   RETURN OF MATERIALS.  Within  thirty (30) 
days  following  termination  of this
Agreement,  each party having  possession  of or control  over any  Confidential
Information  of the other party shall return to such other party all written and
otherwise  recorded or stored matter containing such  Confidential  Information,
including all original matter and all copies thereof;  provided,  however,  that
each  party's  legal  department  or outside  counsel may retain one copy of the
Confidential Information in its confidentially  maintained files, solely for the
purpose of identifying  information  to be protected  pursuant to any applicable
non-disclosure obligation.

                           12.7.3   NTX METER STRIPS REMAINING.  Upon 
termination of this Agreement,  Hologic shall
have the right to sell NTx Meter Strips then  remaining in its  possession or to
be manufactured  using Critical  Reagents then held in inventory,  and Ostex may
sell NTx Meter Strips then remaining in its possession, within a reasonable time
after  termination  hereof;  provided,  however,  that all such  Sales  shall be
subject  to  the  royalty   provisions   of  this   Agreement,   notwithstanding
termination.  Alternatively,  Hologic may return Critical Reagents  remaining in
inventory and in good  condition to Ostex for a refund of the original  transfer
price (or for credit toward any amounts due).

                           12.7.4   SURVIVAL  OF  TERMS.   Notwithstanding   
any  other  provision  herein  to  the
contrary, SECTIONS 3.4, 7.2.4, 7.3, 7.4, 7.6-7.8, 8-13, 16.4, 16.5, and 18-28 of
this Agreement shall survive any termination or expiration hereof.

         13.      REPRESENTATIONS, WARRANTIES AND INDEMNITIES.

                  13.1     BY OSTEX.  Ostex represents and warrants to Hologic 
as follows:
                           13.1.1   ORGANIZATION  AND AUTHORITY.  As of the 
Effective Date of the Agreement,  Ostex
is a corporation duly organized, validly existing and in good standing under the
laws of the State of  Washington,  USA, has all  requisite  corporate  power and
authority to carry on its business and perform its obligations hereunder, and is
duly qualified to do business in any of those jurisdictions in the United States
of America where failure to qualify could have a material  adverse effect on its
ability to perform its obligations hereunder. The execution and delivery of this
Agreement by Ostex, and the performance of the obligations of Ostex contemplated
hereby,  have been duly and validly  authorized by all necessary legal action on
its part,  and this  Agreement  is legal,  valid and  binding  against  Ostex in
accordance with its terms.  Except as have been or will be obtained by Ostex, no
permit, consent, approval or authorization of, or declaration to or filing with,
any person,  party or governmental or regulatory  authority of the United States
is required in connection with the delivery,  consummation and/or performance by

<PAGE>

Ostex of this Agreement. As of the Effective Date of the Agreement,  Ostex is in
full compliance with the WRF/Ostex  Exclusive License Agreement and has not been
notified  of any  assertion  that it is in default of said  WRF/Ostex  Exclusive
License  Agreement or that WRF plans to terminate  any Ostex rights  thereunder.
Ostex shall  immediately  notify Hologic if it receives any notice that it is in
default  of said  WRF/Ostex  Exclusive  License  Agreement  or that WRF plans to
terminate any Ostex right thereunder.

                           13.1.2   OSTEX  PATENT  RIGHTS  AND  OSTEX  KNOW-HOW.
  As of the  Effective  Date of the
Agreement,  and except as described in ATTACHMENT 13.1.2 to this Agreement,  (a)
Ostex has sole and  exclusive  rights to the Ostex Patent  Rights and all rights
necessary  to convey Ostex  Know-How to Hologic and Serex;  (b) the Ostex Patent
Rights,  to the best  knowledge of Ostex are valid and  enforceable,  and do not
infringe on the proprietary rights of any third party: (c) Ostex is not aware of
any "prior art" or other claim  which  would  invalidate  any part or all of the
Ostex Patent Rights; or any claim that Ostex does not have all rights to use and
permit Hologic and Serex to use the Ostex Know-How for all purposes permitted by
this Agreement; (d) Ostex is not aware of any unexpired patent or pending patent
application  of a party not a party to this  agreement  which has  claims  which
cover any part of the Ostex Know-How or Ostex Patent  Rights;  and (e) Ostex has
taken all  necessary  actions to maintain all Ostex Patent  Rights in full force
and effect.

                           13.1.3   NO DEFAULT.  The  execution,  delivery  and
  performance  of this  Agreement by
Ostex does not and shall not conflict with, result in a breach of, or constitute
a default  under (with or without the giving of notice,  or the passage of time,
or both),  any  agreement or instrument to which Ostex is a party or by which it
is bound.

                           13.1.4   OSTEX'S   DISCLAIMER  OF  OTHER  
 WARRANTIES.   Ostex   disclaims  all  implied
warranties, including without limitation any warranty of merchantability or
 fitness for a particular purpose.

EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT,  OSTEX MAKES NO REPRESENTATIONS
AND EXTENDS NO WARRANTIES OF ANY KIND,  EITHER EXPRESS OR IMPLIED,  INCLUDING NO
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

                  13.2     BY HOLOGIC.  Hologic represents and warrants to Ostex
 as follows:

                           13.2.1   ORGANIZATION  AND  AUTHORITY.  As of  the  
Effective  Date  of  the  Agreement,
Hologic is duly organized,  validly existing and in good standing under the laws
of Delaware,  USA has all requisite power and authority to carry on its business
and the  performance of its obligations  hereunder,  and is duly qualified to do
business in any of those  jurisdictions  where  failure to qualify  could have a
material adverse effect on its ability to perform its obligations hereunder. The
execution and delivery of this Agreement by Hologic,  and the performance of the
obligations  contemplated  hereby,  have been duly and validly authorized by all
necessary  legal  action on its part,  and this  Agreement  is legal,  valid and
binding  against  Hologic in accordance  with its terms.  Except as have been or
will be obtained by Hologic, no permit,  consent,  approval or authorization of,

<PAGE>

or  declaration  to or  filing  with,  any  person,  party  or  governmental  or
regulatory  authority  having  jurisdiction  is required in connection  with the
delivery,  consummation and/or performance of this Agreement As of the Effective
Date of the  Agreement,  Hologic is in full  compliance  with the  Hologic/Serex
Agreement and has not been  notified of any  assertion  that it is in default of
said Hologic/Serex Agreement or that Serex plans to terminate any Hologic rights
thereunder.  Hologic  shall  immediately  notify Ostex if it receives any notice
that it is in default of said  Hologic/Serex  Agreement  or that Serex  plans to
terminate any Hologic right thereunder.

                           13.2.2   SEREX PATENT RIGHTS.  As of the Effective  
Date of the  Agreement,  (a) Hologic
is not aware of any "prior  art" which would  invalidate  any part or all of the
SARA patents;  and (b) Hologic is not aware of any  unexpired  patent or pending
patent  application  of a party not a party to this  agreement  which has claims
which cover any part of the SARA patents.

                                    13.2.2.1HOLOGIC  PATENT RIGHTS AND HOLOGIC 
 KNOW-HOW.  As of the Effective Date
of the  Agreement,  (a)  Hologic  has sole and  exclusive  rights to the Hologic
Patent Rights and all rights  necessary to convey Hologic Know-How to Ostex; (b)
the  Hologic  Patent  Rights,  to the best  knowledge  of Hologic  are valid and
enforceable,  and do not infringe on the proprietary  rights of any third party;
(c)  Hologic  is not  aware  of any  "prior  art" or  other  claim  which  would
invalidate  any part or all of the  Hologic  Patent  Rights;  or any claim  that
Hologic  does not have all  rights to use and  permit  Ostex to use the  Hologic
Know-How for all purposes permitted by this Agreement;  (d) Hologic is not aware
of any unexpired patent or pending patent  application of a party not a party to
this Agreement which has claims which cover any part of the Hologic  Know-How or
Hologic  Patent  Rights;  and (e)  Hologic  has taken all  necessary  actions to
maintain all Hologic Patent Rights in full force and effect.

                           13.2.3   NO DEFAULT.  The  execution,  delivery  and
  performance  of this  Agreement by
Hologic  does not and  shall  not  conflict  with,  result  in a breach  of,  or
constitute a default under (with or without the giving of notice, or the passage
of time, or both), any agreement or instrument to which Hologic is a party or by
which it is bound.

                           13.2.4   HOLOGIC'S  DISCLAIMER  OF  OTHER  
WARRANTIES.  Hologic  disclaims  all  implied
warranties, including without limitation any warranty of merchantability or 
fitness for a particular purpose.
EXCEPT  AS   EXPRESSLY   SET  FORTH  IN  THIS   AGREEMENT,   HOLOGIC   MAKES  NO
REPRESENTATIONS  AND  EXTENDS  NO  WARRANTIES  OF ANY KIND,  EITHER  EXPRESS  OR
IMPLIED,  INCLUDING NO WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE

                  13.3 U.S.  FOREIGN  CORRUPT  PRACTICES  ACT.  Each party shall
indemnify, defend and hold the other party, its subsidiaries and Affiliates, and
the directors,  officers, employees and agents of any of them, harmless from and
against all and any claims,  proceedings,  losses,  fines,  expenses  (including
without  limitation  reasonable  attorneys  fees  and  expenses)  and  penalties

<PAGE>

incurred by said party arising out of any Prohibited  Practice committed by said
party or any of its officers, directors, shareholders, employees, or agents.

For purposes of this  SECTION 13, the  following  shall be deemed a  "Prohibited
Practice": the offer, payment, promise to pay, or authorization of the paying of
any money, or the offer, giving,  promise to give or authorization of the giving
of  anything  of value to any  officer  or  employee  of any  government  or any
department,  agency  or  instrumentality  thereof,  or any  person  acting in an
official capacity for or on behalf of any such government, department, agency or
instrumentality,  or any political party or official  thereof,  or any candidate
for political office, or any intermediary for any such persons or party, in each
case for purposes of (a)  influencing any act or decision of any such persons or
party in their or its  official  capacity,  or (b)  inducing  any such person or
party to do or omit to do any act in violation of the lawful duty of such person
or party, or (c) inducing any such person or party to use their or its influence
with any government or instrumentality thereof to affect or influence any act or
decision of any such  government or  instrumentality,  in each case (a), (b) and
(c) in order to assist the  applicable  party  hereto in  obtaining or retaining
business for, or with, or directing business to, any person or entity

                  13.4  GOVERNMENTAL  COMPLIANCE.  Each party  shall  obtain and
maintain all required licenses, permits,  certificates and authorizations needed
to perform its obligations under this Agreement,  including  without  limitation
those   required  for  said  party's   appointment  as   sublicensee,   for  the
effectiveness of this Agreement in all jurisdictions  where said party operates,
for the import and for the export of NTx Meter  Systems,  and for the marketing,
distribution  and  Sale  of NTx  Meter  Systems.  Each  party  shall  be  solely
responsible  for compliance  with any foreign  exchange  controls  affecting its
activities.

         14.      THIRD-PARTY INFRINGEMENT.

                  14.1 NOTICE OF THIRD-PARTY  INFRINGEMENT.  If, during the term
of this Agreement, either party becomes aware that one or more third parties are
infringing or are  threatening to infringe the Patent Rights of a party licensed
hereunder relating to the Field of Use, said party (the "Notifying Party") shall
immediately  report such  information  to the other party to this  Agreement and
shall provide in such report all details in said party's knowledge or possession
concerning the kind and character of the  infringement  and any other  pertinent
information  that  said  party may  have.  At such  time as the party  owning or
controlling  the  infringed  patents  ("Aggrieved  Party")  shall,  in its  sole
judgment,   be  satisfied   that  there  exists  a  reasonable   likelihood   of
infringement,  Aggrieved Party shall take such steps, including notification, to
place the putative  infringer on notice of Aggrieved Party's claims. The form of
the  notification  and the  manner  and  nature  of any  communications  between
Aggrieved Party and the alleged infringer shall be within the sole discretion of
Aggrieved Party.

                  14.2 RIGHT TO SUE. If, sixty (60) days after receipt of notice
of a perceived third-party infringement, such third party infringement continues
and the  Aggrieved  Party has not  commenced  legal  action or  presented to the

<PAGE>

Notifying  Party a plan acceptable to the Notifying Party to enjoin or otherwise
to resolve such infringement, then the Notifying Party shall be entitled, at its
own expense and for its own benefit,  to commence an action in its own name.  In
the event that the Aggrieved  Party  initiates such action,  the Aggrieved Party
shall be entitled to retain all damages awarded  therein.  In the event that the
Notifying Party initiates such action,  the Notifying Party shall be entitled to
retain one half of all damages awarded therein attributable to the Field of Use,
after payment of all reasonable legal expenses of such litigation.  In the event
that the rules  then  obtaining  shall  require  the naming of the owner of said
Patent Rights for purposes of such  infringement  action,  the  Notifying  Party
shall be entitled to name the Aggrieved  Party,  or to cause the Aggrieved Party
to consent to be named,  as a party  plaintiff in such action;  and failing such
cooperation the Notifying Party shall be entitled to reduce royalties payable to
the Aggrieved  Party by fifty percent  (50%).  Each party shall assist the other
party and reasonably cooperate in any such action at said party's request.

         15.      DEFENSE OF THIRD-PARTY CLAIMS.

                  15.1 HOLOGIC DEFENSE OF THIRD-PARTY  CLAIMS AND INDEMNITY.  In
the event that any claim,  suit,  or other legal  proceeding  is  threatened  or
commenced  against  Ostex or WRF  that is  founded,  in whole or in part,  on an
allegation  that the NTx Meter or NTx Meter Strip  infringes  any trade  secret,
patent,  or copyright  belonging  to a third party (other than WRF),  Ostex will
give Hologic  prompt  written  notice of such legal  proceeding  and Hologic may
elect to assume sole control of the defense to or  settlement  of such  dispute.
Ostex  shall  cooperate  fully  with  Hologic  in  any  defense,  settlement  or
compromise made by Hologic.  Ostex shall not enter into any settlement agreement
or other voluntary resolution of any such claim, suit, or other legal proceeding
without obtaining Hologic's prior written consent thereto. If Ostex has complied
fully with the procedures set forth in this SECTION 15.1, Hologic will indemnify
and hold Ostex  harmless  from and  against  any loss,  cost,  damage,  or other
expenses  incurred by Ostex as a result of such claim, suit or legal proceeding.
If a final  injunction is obtained  against  Ostex's use of the NTx Meter or NTx
Meter Strips, or if in the opinion of Hologic the subject NTx Meter or NTx Meter
Strips are likely to become the subject of a successful  claim of  infringement,
Hologic  may,  at its option and  expense,  (i)  procure  for Ostex the right to
continue  distributing  and/or  using the NTx Meter or NTx  Meter  Strips,  (ii)
replace  or modify  the NTx Meter or NTx Meter  Strips so that it (they)  become
non-infringing, or (iii) if neither (i) or (ii) are reasonably available, accept
return of the NTx Meter or NTx Meter  Strips held by Ostex and its  distributors
in  inventory,  and  terminate  this  Agreement  without  further  obligation or
liability.  This  indemnification  provision  shall be null and void and Hologic
shall have no  liability to the extent that any claim is based on any use of the
NTx Assay Technology, Critical Reagents or Ostex Intellectual Property or if the
NTx Meter or NTx Meter  Strips have been  modified  or tampered  with in any way
without the express written consent of Hologic,  or if Ostex has any interest in
the  claim,  suit or other  legal  proceeding,  or any  license  to any right so
asserted.

                  15.2 OSTEX DEFENSE OF THIRD-PARTY CLAIMS AND INDEMNITY. In the
event that any claim, suit, or other legal proceeding is threatened or commenced
against Hologic or Serex that is founded,  in whole or in part, on an allegation
that the NTx Assay Technology,  Critical Reagents or Ostex Intellectual Property
as used in the NTx Meter System infringes any trade secret, patent, or copyright

<PAGE>

belonging to a third party  (other than  Serex),  Hologic will give Ostex prompt
written  notice of such  legal  proceeding  and  Ostex may elect to assume  sole
control of the defense to or settlement of such dispute. Hologic shall cooperate
fully with Ostex in any defense, settlement or compromise made by Ostex. Hologic
shall not enter into any settlement  agreement or other voluntary  resolution of
any such claim,  suit, or other legal proceeding without obtaining Ostex's prior
written consent  thereto.  If Hologic has complied fully with the procedures set
forth in this SECTION 15.2,  Ostex will indemnify and hold Hologic harmless from
and against any loss, cost,  damage,  or other expenses incurred by Hologic as a
result  of such  claim,  suit or  legal  proceeding.  If a final  injunction  is
obtained against Hologic's use of the NTx Assay Technology, Critical Reagents or
Ostex  Intellectual  Property  as used in the NTx  Meter  Systems,  or if in the
opinion  of  Ostex  the  NTx  Assay  Technology,   Critical  Reagents  or  Ostex
Intellectual  Property are likely to become the subject of a successful claim of
infringement,  Ostex may, at its option and expense, (i) procure for Hologic the
right to continue  distributing and/or using the NTx Assay Technology,  Critical
Reagents or Ostex Intellectual Property in the NTx Meter System, (ii) replace or
modify  the NTx  Assay  Technology,  Critical  Reagents  or  Ostex  Intellectual
Property  so that it (they)  become  non-infringing,  or (iii) if neither (i) or
(ii) are  reasonably  available,  accept  return  of the NTx  Assay  Technology,
Critical Reagents or Ostex  Intellectual  Property used in the NTx Meter Systems
held by Hologic and its distributors in inventory,  and terminate this Agreement
without further obligation or liability. This indemnification provision shall be
null and void and Ostex  shall have no  liability  to the extent  that NTx Assay
Technology,  Critical Reagents or Ostex Intellectual Property have been modified
or tampered with in any way without the express  written consent of Ostex, or if
Hologic or Serex have any interest in the claim, suit or other legal proceeding,
or any license to any right so asserted.

                  15.3  ROYALTY   PAYMENTS.   Except  as  provided  above,   any
entitlement to terminate royalties shall occur only upon a final adjudication of
the invalidity or non-enforceability of the patents, copyrights or trade secrets
in question. For such purposes, final adjudication shall mean an adjudication or
determination  by a trial  court or a court of  appeal,  which  adjudication  or
determination shall be final, binding and not further appealable, whether by its
terms or by the passage of time.

         16.      USE OF TRADEMARKS AND TRADE NAMES.

                  16.1 RESTRICTED  RIGHTS TO USE. No provision of this Agreement
shall be interpreted  or construed as conferring  upon either party any right to
use in labeling, advertising,  marketing, publicizing or otherwise promoting NTx
Meter  Systems,  any name,  trade  name,  trademark,  or other  designation  (or
derivation  thereof)  of the  other  party  hereto or WRF or the  University  of
Washington, or Serex, except as expressly provided under this SECTION 16.

                  16.2 USE OF NAMES  AND  MARKS  IN  LABELING.  As a part of the
marketing plan prepared pursuant to SECTION 6.2 hereof,  the parties shall agree
upon  appropriate  trademark(s)  to be used in connection  with NTx Meter Strips
marketed,  promoted,  sold,  and/or  distributed  under this  Agreement.  In the

<PAGE>

absence of such  agreement,  the parties  agree that Hologic  shall affix to the
outer  packaging of, and shall include on the package  insert for, any NTx Meter
Strips  marketed,  promoted,  sold,  and/or  distributed  by Hologic  under this
Agreement,  and in addition to its own trademarks and names,  one or more labels
displaying  with equal  prominence  to said  Hologic  trademarks  or names,  the
statement "An  OsteomarkAE  Assay" or such other trademark or statement as Ostex
shall reasonably  request,  and Ostex shall affix to the outer packaging of, and
shall  include  on the  package  insert  for,  any NTx  Meter  Strips  marketed,
promoted,  sold,  and/or  distributed  by Ostex  under  this  Agreement,  and in
addition to its own trademarks and names,  displaying  with equal  prominence to
said Ostex  trademarks  or names such other  trademark  or  statement as Hologic
shall reasonably request.  Ostex shall also have the right to review and approve
all claims relating to the intended use of NTx Meter Strips contained in package
inserts  and  other   promotional   materials,   which  approval  shall  not  be
unreasonably   withheld.   Each  party  hereby  grants  to  the  other  party  a
non-transferable,  non-exclusive  license,  concurrent  with  the  term  of this
Agreement,   to  use  such  statement  and/or   trademark   accordingly  and  in
substantially the same manner as used by its owner; provided, however, that each
such use of such statement  and/or  trademark be accompanied by a printed notice
identifying  the  owner  as the  owner  thereof.  Neither  party  shall  use any
trademark  of the other  party with  respect  to  products  not  covered by this
Agreement.  In the  event  that  particular  NTx  Meter  Strips  do not meet the
specifications or quality standards  required under SECTIONS 3.4 or 7.2.4 above,
either  party may cause the other party to remove all  trademarks  of said party
from such NTx Meter  Strips  and shall  have the right to cancel  the  foregoing
grant of license to use such  trademarks,  unless the other party promptly meets
such  specifications  or quality  standards.  Each party shall have the right to
receive  and approve the use of its marks in any  proposed  product  literature,
advertising  material or material for publication.  In all such materials unless
otherwise  specifically agreed in advance in writing, the immunoassay  performed
by the NTx Meter Strips shall be identified as "An OsteomarkAE Assay."

                  16.3 TRADEMARK  REGISTRATION.  Ostex and Hologic shall each be
responsible  for  the   registration,   maintenance  and  enforcement  of  their
respective  names,  trade names, and trademarks;  provided,  however,  that each
party  shall  aid the  other  in the  enforcement  of  that  party's  rights  by
monitoring for, and notifying said party of, any unauthorized use of any of said
party's  trademarks.  Each party shall from time to time,  and in any event upon
the  issuance  of  additional  registrations,  modify its use of  trademarks  to
incorporate  proper  notice  of  registration  and other  claims  of  right,  in
accordance  with the laws  and  customs  of the  various  countries  in which it
operates pursuant to this Agreement.

                  16.4 OSTEX  REPRESENTATIONS  AND WARRANTIES.  Ostex represents
and warrants, as of the date of this Agreement, that: (a) Ostex is the owner and
registrant of the  trademarks  issued  registrations  as indicated by ATTACHMENT
16.4;  (b)  Ostex is named as  applicant  in  those  applications  indicated  by
ATTACHMENT  16.4 as pending;  and (c) to the best of its knowledge,  none of the
Ostex trademarks infringes upon the trademark,  trade name, or other proprietary
rights of a third party. In the event that any action or proceeding is initiated
against  Ostex,  Hologic,  or any other  licensee or distributor of Ostex in any
country alleging that the trademark  "Osteomark"  infringes the trademark rights
of the third party initiating such action or proceeding, Hologic may continue to
market NTx Meter Strips within such country  without the  trademark  "Osteomark"
affixed thereto (but with such other trademark as Ostex may reasonably  specify)
pending resolution of the dispute as to trademark rights.


<PAGE>

                  16.5   HOLOGIC   REPRESENTATIONS   AND   WARRANTIES.   Hologic
represents and warrants, as of the date of this Agreement,  that: (a) Hologic is
the owner and registrant of the trademarks issued  registrations as indicated by
ATTACHMENT  16.5;  (b)  Hologic  is named  as  applicant  in those  applications
indicated by ATTACHMENT  16.5 as pending;  and (c) to the best of its knowledge,
none of the Hologic  trademarks  infringes  upon the  trademark,  trade name, or
other  proprietary  rights of an third  party.  In the event  that any action or
proceeding  is  initiated  against  Hologic,  Ostex,  or any other  licensee  or
distributor  of Hologic  in any  country  alleging  that any  Hologic  trademark
infringes  the  trademark  rights of the third party  initiating  such action or
proceeding,  Ostex may continue to market NTx Meter  Strips  within such country
without said Hologic trademark affixed thereto (but with such other trademark as
Hologic  may  reasonably  specify)  pending  resolution  of  the  dispute  as to
trademark rights.

         17.      ASSIGNMENT AND SUBLICENSE.

                  17.1 BY  HOLOGIC.  Except as  specifically  permitted  by this
Agreement,  Hologic  shall not  assign,  sublicense,  delegate,  or in any other
manner transfer any of its rights, privileges,  obligations or duties under this
Agreement to any non-Affiliate  third party without the prior written consent of
Ostex,  which  consent may be withheld in Ostex's sole and absolute  discretion,
provided that this provision  shall not apply to any merger,  consolidation,  or
sale  of  substantially  all of  the  assets  of  Hologic,  or  any  third-party
acquisition of a majority of the business interests or voting shares of Hologic,
provided that the surviving party shall within a reasonable period following the
final  closing of such  transaction,  expressly  agree in writing to be bound by
this  agreement.  Any  attempt by Hologic to  assign,  sublicense,  delegate  or
otherwise transfer any right, privilege, obligation or duty under this Agreement
other than in  accordance  with this SECTION 17 shall be void and shall,  at the
option of Ostex,  be cause for immediate  termination  of this Agreement and all
licenses granted  hereunder.  Transfers of any rights hereunder by Hologic to an
Affiliate  shall be  permitted  only after the  delivery to Ostex of  reasonable
evidence  that such  Affiliate has agreed in writing to be bound by the terms of
this Agreement.

                  17.2  BY  OSTEX.  Except  as  specifically  permitted  by this
Agreement, Ostex shall not assign, sublicense,  delegate, or in any other manner
transfer  any of its  rights,  privileges,  obligations  or  duties  under  this
Agreement to any non-Affiliate  third party without the prior written consent of
Hologic,   which  consent  may  be  withheld  in  Hologic's  sole  and  absolute
discretion,  provided  that  this  provision  shall  not  apply  to any  merger,
consolidation,  or sale of  substantially  all of the  assets of  Ostex,  or any
third-party acquisition of a majority of the business interests or voting shares
of Ostex,  provided  that the surviving  party shall within a reasonable  period
following the final closing of such  transaction,  expressly agree in writing to
be bound by this agreement. Any attempt by Ostex to assign, sublicense, delegate
or  otherwise  transfer  any  right,  privilege,  obligation  or duty under this
Agreement other than in accordance with this SECTION 17 shall be void and shall,
at the option of Hologic,  be cause for immediate  termination of this Agreement
and all licenses granted  hereunder.  Transfers of any rights hereunder by Ostex
to an  Affiliate  shall be  permitted  only  after the  delivery  to  Hologic of
reasonable evidence that such Affiliate has agreed in writing to be bound by the
terms of this Agreement.


<PAGE>

         18.      ARBITRATION.

                  18.1  AGREEMENT  TO SETTLE  DISPUTES  BY  ARBITRATION.  At the
request  through  notice of either Ostex or Hologic,  any  controversy  or claim
arising  between the parties and related to or arising out of the  construction,
interpretation, or enforcement of any term or condition of this Agreement or any
transaction  hereunder  (including  the decision to enter into this  Agreement),
which  controversy or claim cannot first be settled amicably between the parties
(including  without  limitation  through  utilization of  third-party  mediation
agreed to by both parties), shall be submitted to arbitration.  Such arbitration
shall be  conducted  in Seattle,  Washington,  if  initiated  by Hologic,  or in
Boston,  Massachusetts,  if  initiated  by Ostex,  and in either  case  shall be
conducted in accordance  with the applicable  Rules of the American  Arbitration
Association in effect on the date of such controversy or claim.

                  18.2 APPOINTMENT OF ARBITRATORS. Within thirty (30) days after
the  delivery  pursuant  to  SECTION  18.1  above of a  notice  of  request  for
arbitration, Hologic and Ostex shall each appoint one person as an arbitrator to
hear and  determine  the  dispute.  The two persons so chosen shall by agreement
select  a third,  impartial  arbitrator,  which  selection  shall  be final  and
conclusive  upon  both  parties.   Each  arbitrator   shall  be  experienced  in
international and domestic manufacturing and distribution of products similar to
NTx Meter  Systems.  If either party fails to designate  its  arbitrator  within
sixty (60) days after the notice of arbitration is received, then the arbitrator
designated by the one party shall act as the sole arbitrator and shall be deemed
to be the single, mutually approved arbitrator to resolve the dispute.

                  18.3 ARBITRATORS'  POWERS.  The arbitrators shall have all the
powers  of a State or  Federal  Court  located  at the site of the  arbitration,
including the power to order specific enforcement of this Agreement and to order
the  production  of  relevant  and  non-privileged  documents  by one  party for
inspection and duplication by the other party prior to the arbitration  hearing;
provided,  however,  that the arbitrators  shall be bound by this Agreement with
regard to the restriction on consequential,  incidental, and punitive damages as
set forth in SECTION 19.3 below.

                  18.4  DISCOVERY.  The  arbitrators  prior to the hearing shall
grant  discovery  pursuant  to the  intendment  of the  Federal  Rules  of Civil
Procedure,  and  as  the  arbitrators  determine  to be  appropriate  under  the
circumstances.

                  18.5 PROTECTIVE  ORDER. In the event of arbitration and at the
request of either Ostex or Hologic, in order to protect Confidential Information
and any other  matter  that  either  party  would  normally  not reveal to third
parties,  the  arbitrators  shall enter a  protective  order in such form as the
parties shall stipulate or as the arbitrators shall determine is suitable. Among
other  things,  the  protective  order  shall  stipulate  that  the  arbitrators
themselves  shall  receive  any  information   designated  by  either  party  as
"confidential"  solely for purposes of assessing  the facts and law for purposes
of the arbitration,  and shall not otherwise use or disclose such matter. At the
request of either party,  the  protective  order shall be entered as an award of

<PAGE>

the arbitration  panel and shall enable either party to obtain the assistance of
a court of competent  jurisdiction to enter equitable decrees or other relief to
enforce the provisions of the order as if it had been entered by that court.

                  18.6 EFFECT OF DECISION. The decision of the arbitrators shall
state the reason for the award and shall be final,  binding and conclusive  upon
the parties.  The parties shall comply with such decision in good faith as if it
were a final  decision of a court.  Judgment  upon the award shall be entered in
any court of  competent  jurisdiction.  Any award  made in  connection  with any
arbitration shall be made in U.S. Dollars.

                  18.7 RIGHTS OF THIRD PARTIES. Notwithstanding the agreement to
arbitrate any dispute between Ostex and Hologic, in the event that a controversy
or claim between Ostex and Hologic  involves an  adjudication of the rights of a
third party,  and that third party does not agree to submit to  arbitration  and
would under Rule 19(a) of the Federal Rules of Civil Procedure,  if feasible, be
joined as an  indispensable  party,  then the  dispute  shall be brought to, and
determined by, a court of the competent jurisdiction.

                  18.8 INTERIM  RELIEF.  Upon the application of either party to
this  Agreement,  and  whether or not an  arbitration,  mediation  or attempt to
settle amicably has yet been initiated,  all courts having jurisdiction over one
or more of the  parties are  authorized  to: (i) issue and enforce in any lawful
manner such temporary  restraining  orders,  preliminary  injunctions  and other
interim  measures  of relief as may be  necessary  to prevent  harm to a party's
interests  or  as  otherwise  may  be  appropriate  pending  the  conclusion  of
arbitration  proceedings pursuant to this Agreement;  and (ii) enter and enforce
in any lawful manner such  judgments for  permanent  equitable  relief as may be
necessary  to  prevent  harm  to a  party's  interests  or as  otherwise  may be
appropriate   following  the  issuance  of  arbitral  awards  pursuant  to  this
Agreement.

         19.      ATTACHMENTS.  The  Attachments  listed below are  incorporated
  by reference  into this Agreement
and shall for all purposes be deemed part hereof:

Attachment D               Serex Patent Rights
Attachment 3.4             Ostex Critical Reagent Specifications
Attachment 6.2             Marketing Plan (To be Appended per SECTION 6.2)
Attachment 7.2.4           Product Specifications - NTx Meter Strips and NTx
                           Meters

Attachment 13.1.2          Ostex Patent Rights and Know-How - Exceptions to 
                           Warranty
Attachment 16.4            Ostex Trademark Filings
Attachment 16.5            Hologic Trademark Filings


         20.      PUBLICITY.  No party shall  announce or publicize  this  
     Agreement or any terms thereof  without the advance  written consent of the
others (which approval shall not be unreasonably withheld).


<PAGE>

         21.      RESPONSIBILITY  FOR CLAIMS.  In order to distribute  between 
     themselves  the  responsibility  for the  handling  and  expense  of claims
arising out of the manufacture, distribution, Sale or use of NTx Meter

Systems, the parties agree as follows:

                  21.1  OSTEX  LIABILITY.  Ostex  shall be liable  for and shall
indemnify and hold Hologic harmless  against any liability,  damages or loss and
from  any  claims,  suits,  proceedings,  demands,  recoveries  or  expenses  in
connection with (i) any Critical  Reagents or NTx Assay  Technology  licensed or
sold by  Ostex to  Hologic  or its  designated  manufacturers  pursuant  to this
Agreement  arising out of, based on, or caused by product claims whether written
or oral,  made or alleged to be made,  by Ostex in its  advertising,  publicity,
promotion,  or Sale of the Critical  Reagents or NTx Assay Technology where such
product  claims  were not  approved  by Hologic,  including  without  limitation
expenses of total or partial product recalls as described in SECTION 7.7 hereof,
or  (ii)  any  breach  by  Ostex  of any of its  representations  or  warranties
contained  herein or (iii) any of its  negligent or willful  acts or  omissions.
Hologic shall  promptly  notify Ostex of any such demand or claim which comes to
its attention.

                  21.2 HOLOGIC LIABILITY.  Hologic shall be liable for and shall
indemnify and hold Ostex  harmless  against any  liability,  damages or loss and
from  any  claims,  suits,  proceedings,  demands,  recoveries  or  expenses  in
connection  with (i) any NTx Meters or NTx Meter Strips sold by Hologic to Ostex
pursuant to this Agreement arising out of, based on, or caused by product claims
whether  written  or  oral,  made or  alleged  to be  made,  by  Hologic  in its
advertising, publicity, promotion, or Sale of the NTx Meters or NTx Meter Strips
where  such  product  claims  were not  approved  by  Ostex,  including  without
limitation  expenses of total or partial product recalls as described in SECTION
7.7  hereof,  or (ii) any  breach by Hologic  of any of its  representations  or
warranties  contained  herein or (iii) any of its  negligent  or willful acts or
omissions. Ostex shall promptly notify Hologic of any such demand or claim which
comes to its attention.

                  21.3   CONSEQUENTIAL,   INCIDENTAL,   AND  PUNITIVE   DAMAGES.
Notwithstanding  any other provision of this  Agreement,  neither party shall be
liable to the other party for any special, consequential, incidental or punitive
damages  that may arise out of this  Agreement  (including  but not  limited  to
damages for loss of sales, potential sales, profits or business),  regardless of
whether such other party has been informed of the possibility  that such damages
may occur.


<PAGE>


         22.      NOTICE.  Any notice  given in regard to this  Agreement  
shall be given in  writing  and shall be
delivered  personally,  or shall be sent by first class mail or registered  
certified  mail,  postage,  and charges
prepaid, to:

         if to Ostex:

                  Ostex International, Inc.
                  2203 Airport Way South

                  Suite 400
                  Seattle, Washington 98134

                  Attention:        Jeffrey J. Miller, Ph.D.,
                                    Senior Vice President, Corporate Development
                  Copy to:          Robert Glaser, President and COO

         if to Hologic:
                  Hologic, Inc.
                  590 Lincoln Street,
                  Waltham, MA 02154

                  Attention:        Joel Weinstein, Vice President - 
                                    Business Development
                  Copy to:          S. David Ellenbogen, Chairman and CEO

Any notice so given shall be  effective  upon the date of actual  receipt by the
addressee as evidenced by return receipt or other written  confirmation.  Either
party may by advance  notice  given  pursuant  to this  SECTION 21  designate  a
substitute address for receipt of future notices.

         23.  GOVERNING  LAW.  All  claims or  controversies  asserted  by Ostex
against  Hologic or Serex shall be construed and enforced in accordance with the
laws of the Commonwealth of Massachusetts. Any judicial action by Ostex relating
to the  relationship  between the parties  pursuant to this Agreement,  or goods
purchased or licensed  hereunder  (together with any  counterclaims  asserted by
Hologic or Serex),  shall be  brought  and tried in the State or Federal  Courts
located  in  Massachusetts.  All  claims or  controversies  asserted  by Hologic
against Ostex or WRF shall be construed and enforced in accordance with the laws
of the State of  Washington.  Any  judicial  action by Hologic  relating  to the
relationship between the parties pursuant to this Agreement,  or goods purchased
or licensed  hereunder  (together  with any  counterclaims  asserted by Ostex or
WRF),  shall be brought and tried in the State or Federal  Courts located in the
State  of  Washington.   Notwithstanding   the  foregoing,   interpretation  and
enforcement  of the  provisions of SECTION 18 shall be governed by and construed
in accordance with the Federal Arbitration Act.

         24. INTEGRATION.  It is the desire and intent of the parties to provide
certainty as to their future rights and undertakings herein. The parties in this
Agreement  have  incorporated  all   representations,   warranties,   covenants,
commitments and  understandings  on which they have relied in entering into this
Agreement,  and,  neither  party makes any covenant or other  commitment  to the
other concerning its future action. Accordingly,  this Agreement, in conjunction
with the  Co-Promotion  Agreement:-  (i)  constitutes  the entire  agreement and

<PAGE>

understanding  between the parties and there are no  promises,  representations,
conditions,  provisions or terms related  thereto other than those forth in this
Agreement  and  (ii)  supersedes  all  previous  undertakings,   agreements  and
representation between the parties, written or oral, with respect to the subject
matter hereof.  No modification  of, addition to, or waiver of any provisions of
this  Agreement  shall be binding upon either party hereto unless the same shall
be in writing duly executed by a duly authorized  representative of both parties
hereto.

         25.      MODIFICATION.  No  modification  to this Agreement  shall be 
 enforceable  unless made in writing
and signed by an authorized representative of each party.

         26. SEVERABILITY.  In the event that any provision of this Agreement is
determined to be invalid or unenforceable  for any reason,  such provision shall
be deemed  inoperative only to the extent that it violates or conflicts with law
or public policy and shall be deemed modified to the extent necessary to conform
thereto, and all other provisions hereof shall remain in full force and effect.

         27.  WAIVER.  No express or implied waiver by either party of any right
or remedy with  respect to a default by the other party under any  provision  of
this  Agreement  shall be deemed,  interpreted  or  construed as a waiver of any
right or remedy with  respect to any other  default  under the same or any other
provision hereof.

         28.      SUCCESSORS AND ASSIGNS.  This  Agreement  shall be binding 
     upon and shall inure to the benefit of the parties'  respective  successors
and assigns,  subject to the  restrictions on assignment set forth in SECTION 17
above.

         29.  NONCOMPETITION.  During the term of this Agreement,  Hologic shall
not enter into or maintain any marketing, licensing, or development agreement or
relationship  (whether  directly  or  by  reason  of  any  merger,  acquisition,
consolidation  or otherwise)  with any company (other than Serex) which competes
with Ostex to develop  biochemical  markers of bone resorption,  and Ostex shall
not enter into or maintain any marketing, licensing, or development agreement or
relationship  (whether  directly  or  by  reason  of  any  merger,  acquisition,
consolidation  or  otherwise)  with any company  which  competes with Hologic to
develop  devices to measure bone mass or other  structural  characteristics.  If
Hologic violates this provision, Ostex as its sole remedy for such violation may
at its  option  and upon 30 days  notice,  terminate  this  Agreement.  If Ostex
violates this  provision,  Hologic as its sole remedy for such  violation may at
its option and upon 30 days notice, terminate this Agreement.

         30. STANDSTILL  PROVISION.  During the term of this Agreement,  Hologic
shall  not make any offer  for,  and shall  not  actually  acquire  any legal or

<PAGE>

beneficial interest in the common stock or other securities of Ostex without the
prior written  consent of Ostex's  Board of Directors;  and Ostex shall not make
any offer for, and shall not actually  acquire any legal or beneficial  interest
in the common  stock or other  securities  of  Hologic  or Serex,  respectively,
without the prior written consent of Hologic's  Board of Directors.  The parties
each agree that any violation of this provision would cause  irreparable harm to
the other  party.  The parties each agree that the other party shall be entitled
to  all  equitable  remedies  available  to  it to  prevent  violation  of  this
provision,  as well as all other legal remedies, and if successful in any claim,
may recover from the violating  party all  reasonable  costs and attorneys  fees
expended by it in seeking such remedy.

         IN  WITNESS  WHEREOF,  the  parties  hereto  have  duly  executed  this
agreement the day and year last written below.

         DATED AND EFFECTIVE as of the date first written above.

                                           OSTEX INTERNATIONAL, INC.

                                           By       /S/ JEFFREY J. MILLER, PH.D.
                                                    Jeffrey J. Miller, Ph.D.,
                                                    Senior Vice President, 
                                                    Corporate Development

                                  HOLOGIC, INC.

                                           By       /S/ S. DAVID ELLENBOGEN

                                                    S. David Ellenbogen
                                                    Chairman and CEO


<PAGE>


                                  ATTACHMENT D

                               SEREX PATENT RIGHTS

  See Attached List as of 12/26/95 which represents Hologic's current knowledge
                          (to be updated and confirmed)


<PAGE>


                                     PATENTS

              (a list to be updated to the date of this Amendment)

1.    US Patent No. 5,451,504 (Serial No. 07/737,091).

      Method and Device for Detecting the Presence of an Analyte in a Sample

2.    US Serial No. 08/047,156

     An Integrated Packaging Holder Device for  Immunochromatographic  Assays in
Flow-Through or Dipstick Formats and foreign counterparts thereof and continuing
application US Serial No. 08/539,170 (continuation of 08/047,156)

3.    US Serial No. 08/196,092 and foreign Counterparts

4.    US Serial No. 08/493.420 and foreign counterparts

5.    US Serial No. 08/192,778


<PAGE>


                                 ATTACHMENT 3.4

                            Ostex Critical Reagent Specifications

                           OSTEX INTERNATIONAL, INC.

TITLE                   Lot No.         Doc No.         Rev.            Page
Ion Exchange 1H11                       2020            B               16 of 16
Purified
_______________________________________________________________________

7.0 Quality Control Testing

        7.1 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
_______________________________________________________________________
                Test            Acceptance               Pass/   Initials/
Parameter       Method          Criteria  Results         Fail    Date
_______________________________________________________________________
7.2  XXXXX      0004            XXXXX   _____           ____    ____
7.3  XXXXX      0006            XXXXX   _____           ____    ____
7.4  XXXXX      XXX             XXXXX   _____           ____    ____

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXX results


_________________________________________________________________________
Record reviewed by_________________________     ___________________
                    Quality Control             Date
Record reviewed by_________________________     ___________________
                                Quality Assurance               Date
Released _________________________________      Not Released _________
<PAGE>

<TABLE>
<CAPTION>

OSTEX INTERNATIONAL, INC.

TITLE                   Lot No.         Doc No.         Rev.            Page
NTx Concentrate                         2007            G               23 of 24
_______________________________________________________________________

                                                   -------ATTACHMENT 3-------
                                                            QC DATA SHEET
<S>             <C>     <C>             <C>            <C>       <C>             <C>

                Volume  NTx nromal      NTx Total       Protein  Protein         Specific Activity
                (ml)    BCE step 3.1    nanamol (ml)    step 8.3 Total mg        - (nmol/ml)/
                                        (ml)                     protein (mg/ml  mg/mlprotein
                                        nmol/ml BCE              Vol (ml))
                ____   ______          ________        _____     ________        __________

7.3.4 XXXX      Step 7.3.3
7.10 XXXX       Step 7.9
7.22 XXXX       Step 7.20
7.28 XXXX       Step 7.27

</TABLE>

Total Nanomole yield =  (total nmoles step 7.3.4)            x 100=___________%
                       -----------------------------
                         (total nmoles step 7.28)
QC materials used
Osteomark kit PN 9006 or 9006 LN _____, clibrator diluent PN 2022 LN____
PBS PN 2003 LN ___. Gold 300 pmol.ml NTx in PBS from PN 4010 LN 336C04

(A) Assay 1 dilution 1_______   (D) Assay 2, Dilution 1______________
(B) Assay 1 dilution 2_______   (E) Assay 2, Dilution 2______________
(C) Avg. of (A) and (B)_______  (F) Avg. of (D) and (E) ______________
(G) Percent difference of (C) and (F) ____ (if(C)is greater than 
 20%, repeat steps 8.1.3 to 8.1.5)
(H) Average (A),(B), (D) and (E)____ (Record (H) in the table above)
Note: Percent difference between x and y =100 (absolute 
value (x-y)/(average(x,y))

Number of aloquots:  _________
Volume of alquots:  __________
Total volume to inventory:________
Total nanomoles BCE to Inventory: _________





<PAGE>

                                 ATTACHMENT 6.2

                 MARKETING PLAN (TO BE APPENDED PER SECTION 6.2)


<PAGE>


                                ATTACHMENT 7.2.4

            Product Specifications - NTx Meter Strips and NTx Meters

                     See Attached - Subject to Modification


<PAGE>


            Product Specifications - NTx Meter Strips and NTx Meters

                   Hologic Point-of-Care Bone Resorption Test

                          DRAFT Specifications (Goals)

1.  The test is being designed so as to qualify for XXXXX.
2.  Specimens = XXXX.
3.  The method of XXXXXXXX must be simple, clean, nearly foolproof, and 
designed "to render the likelihood of erroneous results negligible." XXXXX
4.  There will be XXXXX.
5.  The target time to run the tests, from the beginning of application of the
specimen to the strips, is XXXXX.
6.  The XXXXX limits of the XXXXX.  The test should cover XXXXX.
7.  The  XXXXX limits of the XXXXX.  The test should cover XXXXX.
8. For both tests, XXXXX.
9.  XXXXX. There will be approximately the dame as those of comparable tests 
currently commercially available.
10.  Substances typically or occasionally found in XXX should not interfere 
with test performance.  Though the list remains to be specified, probable 
candidates for inclusion are: XXXXX.

TEST FORMAT

11.  Initiation of any timing should be simple. (E.G.,XXXXX).
12.  Once the (timed) test begins, and until it concludes, XXXX should be 
required.

CONTROLS

13.  XXXXX will be supplied to users, with appropriate instructions for use.  
The goal is to have XXXX, and controls XXXX which are to be run as infrequently
 as possible, while providing acceptable levels of control.

METER FUNCTION

14.  The meter will detect XXXX from each strip, and then using XXXX will 
calculate concentrations and the XXXX.
15.  The result reported by the meter will be the XXXXX.
16.  XXXXX.
17.  The meter will XXXXX as required.   XXXXXX.

ERROR CONDITIONS

18.  XXXXX.
19.  If the meter detects a XXXX, no test result will be reported, and the 
meter will indicate XXXX.
20.  Application of an XXXXXXX will detedted by the meter, and no test result 
will be reported.

METER MAINTENANCE

21.  The XXXX of the meter will be cleanable using XXXX.
22.  If a meter malfunctions, it will be returned to the manufacturer for 
repair, and a replacement meter will be given to the user.

METER POWER, RELIABILITY

23.  The meter will be powered by XXXX. Target XXXX lifetime is XXXXX.
24.  Meter XXXXXXXXXXXXX in production.

STABILITY

25.  Target strip stability at launch XXXX.

METER REGULATORY REQUIREMENTS

26.  The meter will be manufactured according to XXXXX.
27.  The meter will have the XXXX.
28.  The meter will meet XXXX limits XXXX and XXXX limits XXXXX.


<PAGE>


                                ATTACHMENT 13.1.2

            OSTEX PATENT RIGHTS AND KNOW-HOW - EXCEPTIONS TO WARRANTY

Pursuant to paragraph  14.1,  the WRF and Ostex on June 12, 1996,  filed a civil
action for patent  infringement  against  Osteometer  Biotech A/S and Diagnostic
Systems Laboratories, Inc. in the U.S. District Court of the Western District of
Washington at Seattle (Civil Action No.  C96-0910WD).  The patent in suit,  U.S.
Patent  No.  5,455,179,  claims a method  of  monitoring  degradation  of type I
collagen   using  an  antibody  that  binds  to   carboxy-terminal   telopeptide
metabolites of type I collagen in urine and other body fluids.  Plaintiffs claim
that the CrossLaps  ELISA Kit  manufactured  and  distributed  by the defendants
infringes the `179 patent.  Defendants have  counterclaimed that the `179 patent
is  invalid,  not  infringed,  and  unenforceable.  Osteometer  has also  denied
jurisdiction. The case is set for trial commencing 12/2/97.

     Ostex  is  also  defending  two  of  its  European  patents  in  opposition
proceedings in the European Patent Office.  European Patent No. 394,296 has been
opposed by Osteometer Biotech A/S,  F.Hoffman-LaRoche  AG, and Metra Biosystems,
Inc.  European  Patent No.  502,928 has been opposed by Osteometer  Biotech A/S,
Metra Biosystems, Inc., and Boehringer Mannheim GMBH.


<PAGE>



                                 ATTACHMENT 16.5

                            HOLOGIC TRADEMARK FILINGS

MARK            REGISTRATION NO.       ISSUE DATE              NOTES
- ----            ----------------       ----------              -----
ACCLAIM         1,70,513               4/23/96           X-Ray Technology, Inc.
CER             1,751,849              2/9/93                     _
HOLOGIC         1,652,292              7/30/91                    _
XXXXXXX         XXXXXXXXXXXX           XXXXX                  XXXXXXXXX.
XXXXXXX         XXXXXXXXXXXX           XXXXX                  XXXXXXXXX
QDR             1,510,840              11/1/88     Assigned to X-Ray Technology,
                                                                        

QDR-1000        1,506,996              10/4/88     Assigned to X-Ray Technology,
                                                                  Inc. 11/4/91
SAHARA          2,008,809              10/15/96                    _
XXXXXXX         XXXXXXXXXXX            XXXXXX                 XXXXXXXXXX
UBA             1,529,557              3/14/89                     _

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX



<PAGE>

Note:  Confidential treatment requested.  Exhibit omits information that has
       been filed separately with the Securities and Exchange Commission.  


                               RESEARCH AGREEMENT

         THIS RESEARCH AGREEMENT is effective this 1st day of July, 1996, by and
between  OSTEX  INTERNATIONAL,   INC.,  a  Washington  corporation,  having  its
principal  place of business  at 2203  Airport  Way South,  Suite 400,  Seattle,
Washington  98134  ("Ostex"),  and the  UNIVERSITY  OF  WASHINGTON,  having  its
principal office at Seattle, Washington 98195 ("University").

                                    RECITALS

         A. Ostex has an ongoing  interest  in  research  technology  (including
inventions,  processes,  formulae and the like,  whether or not patentable,  and
property  eligible for  copyright  protection)  for  measuring the rate of human
tissue  resorption based on the quantitation of specific marker peptides derived
from  cross-linking  sequences  in  collagen,  entitled  "Molecular  Markers  of
Connective Tissue  Degradation," as more particularly  described in that certain
proposal attached as EXHIBIT A (the "Technology");

         B. The Technology has been assigned by the University to the Washington
Research  Foundation  ("WRF") pursuant to Section 3.3 of that certain Technology
Administration Agreement, dated January 1, 1985, between the University and WRF,
as amended (the "UW  Agreement").  Pursuant to that certain  Restated  Exclusive
License  Agreement  between Ostex and WRF,  effective  June 29, 1992, as amended
(the "Exclusive License Agreement"),  WRF granted Ostex an exclusive,  worldwide
license to make, have made, assign, sublicense, lease, develop, enhance, modify,
produce, reproduce, demonstrate, market, promote, sell, distribute, use, exploit
and otherwise commercialize and prepare derivations of the Technology;

         C.       Ostex  entered  into a  Research  Agreement  dated July 26, 
     1989 and amended  November 1, 1992  pursuant to which  initial  funding was
provided by Ostex for research with respect to the Technology;

         D.       It is in the mutual  interest of Ostex and University 
     that research be continued  with respect to the  Technology,  in accordance
with a research  program to be conducted and funded  pursuant to this  Agreement
(the "Research Program"); and

         E. Ostex is willing to fund the conduct of the Research Program, at and
through the University of Washington,  Department of Biological  Structure,  and
the University desires to obtain such funding,  all subject to and in accordance
with the terms of conditions set forth in this Agreement.

                                   AGREEMENTS

         In consideration of the covenants and promises contained herein and for
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1.       SCOPE/SCHEDULE

         The Research Program shall be conducted in accordance with the Research
Proposal  attached  hereto as  EXHIBIT  A and made a part  hereof,  or  mutually
agreeable written  modifications  thereof. The Research Program shall be carried
out during the Program Period (as defined  below),  unless sooner  terminated or
extended as herein provided.

         2.       PROGRAM PERIOD

         The Program Period shall be from XXXXXXXXXXXXXXXXX,  and it may be 
extended
by mutual written consent of the parties not less than thirty (30) days prior to
the termination of the then current Program Period.

         3.       OSTEX'S PRINCIPAL OBLIGATIONS

         Ostex shall pay University a total of XXXXXXXXXXXXXXX to cover all 
direct and indirect costs of the Research  Program asset forth in the Budget  
included in the Research  Proposal  attached  hereto as
EXHIBIT A and incorporated herein.

         4.       PAYMENT

         Ostex  will  provide  University  funds for the  costs of the  research
performed  under this  Agreement  as  specified  in the Budget.  Ostex shall pay
University as follows upon receipt of invoices from University:

            PAYMENT                   DATE                 AMOUNT

              1                                  XXXX                  XXXX
              2                                  XXXX                  XXXX
              3                                  XXXX                  XXXX
              4                                  XXXX                  XXXX
              5                                  XXXX                  XXXX
              6                                  XXXX                  XXXX
              7                                  XXXX                  XXXX
              8                                  XXXX                  XXXX
              9                                  XXXX                  XXXX
              10                                 XXXX                  XXXX
              11                                 XXXX                  XXXX
              12                                 XXXX                  XXXX

                                                 Total                 XXXX


<PAGE>


University will submit its customary  statement of expenses  incurred under this
Agreement within thirty (30) days after the end of each six-month period.

         5.       PRINCIPAL INVESTIGATOR

         For the purpose of this  Agreement and pursuant to  University  policy,
David  R.   Eyre  is   designated   the   Principal   Investigator   ("Principal
Investigator")  who  shall be  responsible  for  direction  and  content  of the
Research Program,  including  budgeting and revisions to the Budget necessary to
accomplish the Research  Program.  Should the Principal  Investigator  leave the
University or otherwise become unavailable during the Program Period, University
may  nominate a  replacement.  If Ostex does not  accept  the  replacement,  the
Research  Program and Budget may be modified to reflect a reduced  scope of work
or  terminated  on sixty  (60)  days'  notice at the  option of Ostex  unless an
arrangement  acceptable  to Ostex can be made to  subcontract  with the departed
Principal  Investigator  or his new  institution  to  continue  the  work on the
Research Program.

         6.       CONFIDENTIALITY

         Neither  party  shall  furnish  any  confidential   and/or  proprietary
information  of a third  party  to the  other  party  in  connection  with  this
Agreement.  Any such  information  which  either  party wishes to furnish to the
other party shall be the subject of a separate confidentiality agreement between
the parties.

         7.       DATA REPORTS AND FACILITIES

                  7.1  University   shall,   in  accordance   with   established
University practice,  keep complete,  accurate,  and authentic accounts,  notes,
data, and records of the work  performed  under this Agreement and shall provide
Ostex with semi-annual reports within thirty (30) days following the end of each
six-month period commencing on the date of this Agreement. University shall also
submit to Ostex a written  comprehensive final report within ninety (90) days of
termination of the Research Program.

                  7.2  At  the  discretion  and  convenience  of  the  Principal
Investigator, during the course of the Research Program, Ostex's representatives
and others  designated by Ostex may be present as observers while various tests,
inspections  and other  aspects of the  Research  Program  are being  conducted.
Ostex's  representatives may consult informally with the Principal  Investigator
regarding the Research Program both personally and by telephone. Further, Ostex,
at its expense,  shall have the right to send one Ostex  employee to work and be
trained  at  the  Department  of  Orthopedics  at  the  University.   University
acknowledges and agrees that the Principal Investigator may serve as a member of
the board of  directors  and/or as a  consultant  (but not an  officer) of Ostex
during the term of this Agreement.

                  7.3 From its own  resources  and  those  provided  under  this
Agreement,  University  agrees  to  make  available  laboratory  facilities  and
equipment for the Research Program.

         8.       INVENTION RIGHTS

                  8.1 University acknowledges and agrees that (i) all Technology
made,  developed or conceived on or before the date of this  Agreement  has been
assigned to WRF pursuant to Section 3.3 of the UW Agreement,  and no commitments
have been made with respect to such Technology pursuant to Section 3.2 of the UW
Agreement,  (ii) all Technology  made,  developed or conceived after the date of
this  Agreement  will be  submitted  to WRF  pursuant  to Section  3.1 of the UW
Agreement,  (iii) no  commitment  will be made pursuant to Section 3.1 of the UW
Agreement with respect to Technology made, developed or conceived after the date
of this Agreement  unless Ostex agrees to such  commitment in writing,  and (iv)
University shall not terminate, amend, waive or enforce the UW Agreement (or any
rights or  obligations  thereunder)  in any manner that could  adversely  affect
Ostex's  rights  under this  Agreement  unless  Ostex  agrees in writing to such
termination, amendment, waiver or enforcement.

                  8.2 University  shall have no right,  title or interest in any
Technology  made,  developed or conceived by employees or  consultants  of Ostex
entirely without use of University facilities.

         9.       PUBLICATION

         University  will be free to publish the  results of research  conducted
under this Agreement within a reasonable period of time. University will provide
copies of  manuscripts  to Ostex prior to their  submission  for  publication or
their presentation. In order to full protect the rights of University and Ostex,
any contemplated  publication or other  dissemination  containing  details of an
invention,   whether  or  not  patentable,  will  be  withheld  until  a  patent
application is filed or other appropriate steps to protect commercial value have
been completed.  Such withholding shall be kept to a minimum and will not exceed
six (6) months, except by mutual agreement between Ostex and University.

         10.      INDEMNIFICATION

         University  and Ostex each agree to indemnify  and to hold harmless the
other  party  from  damage to  persons  or  property  resulting  from any act or
omission on the part of itself, its employees, its agents, or its officers.

         11.      NOTICES

         Whenever  any notice is to be given  hereunder,  it shall be in writing
and shall be deemed received,  if delivered by courier on a business day, on the
day  delivered,  or on the fifth  business  day  following  mailing,  if sent by
first-class,  certified or registered mail,  postage  prepaid,  to the following
addresses:

         University:                Director, Grant and Contract Services
                                    3935 University Way N.E., JM-24
                                    Seattle, Washington  98195

         Ostex:                     Ostex International, Inc.
                                    2203 Airport Way South, Suite 301
                                    Seattle, Washington  98134

         12.      TERMINATION

                  12.1 This  Agreement  may be  terminated  by University at any
time or by Ostex at any time on or after XXXXXXXX.  Sixty (60) days' prior  
written  notice  is needed  from one  party to the  other if  either  party
determines,  in  its  discretion,   that  the  Research  Program  is  no  longer
academically,  technically or commercially feasible. Upon receipt or delivery of
such notice of termination,  University shall exert its best efforts to limit or
terminate any outstanding financial commitments for which Ostex is to be liable,
and Ostex shall reimburse University (to the extent not previously paid) for all
costs incurred by it for the Research Program,  including,  without  limitation,
all uncancellable obligations.  University shall furnish, within sixty (60) days
of the effective date of  termination,  a final report of all costs incurred and
all funds  received and shall  reimburse  Ostex for payments which may have been
advanced in excess of total costs incurred with no further obligations to Ostex.

                  12.2 Notwithstanding  paragraph 12.1, in the event that either
party shall be in default of any of its  obligations  under this  Agreement  and
shall fail to remedy such default  within thirty (30) days after written  notice
thereof,  the party not in default  shall have the  option of  terminating  this
Agreement by giving written notice of termination to the defaulting party.

                  12.3 Termination of this Agreement shall not affect the rights
and  obligations  of the parties  accrued prior to termination or the rights and
obligations set forth in Article 8.

         13.      WARRANTS AND COVENANTS BY UNIVERSITY

                  13.1  University  hereby  warrants  that it has the  right and
authority  to enter  into  this  Agreement  and that the  representatives  whose
signatures appear hereunder are duly authorized by University to enter into this
Agreement on behalf of University.

                  13.2  University  covenants  that it will not knowingly  enter
into agreements with any industrial and/or commercial  funding source other than
Ostex inconsistent with its obligations under this Agreement.

         14.      APPLICABLE LAW

         This  Agreement  shall  be  governed  by  the  laws  of  the  State  of
Washington.

         15.      ARBITRATION AND JURISDICTION

                  15.1 At the request of either party, any  controversy,  claim,
or dispute  arising out of or relating to any provision of this Agreement  shall
be  settled  by  arbitration  to  be  conducted  in  Seattle,  Washington.  Such
arbitration  shall be in  accordance  with the  rules  applied  by the  American
Arbitration  Association.  Judgment upon any award rendered through  arbitration
may be entered into any court of competent jurisdiction.

                  15.2     Ostex and University agree to submit to jurisdiction
 in Seattle, Washington.

         16.      PARTIES BOUND

         This  Agreement,  including the  indemnification  provisions,  shall be
binding upon and inure to the benefit of the parties  hereto,  their  respective
successors,  assigns,  legal  representatives  and heirs.  Ostex may assign this
Agreement  to any  successor  to  all or  substantially  all of the  assets  and
business of Ostex.  This  Agreement  shall not otherwise be assignable by either
party without the prior written consent of the other party.

         17.      NO ORAL MODIFICATION

         No  change,  modification,  extension,  termination  or  waiver of this
Agreement, or any of the provisions herein contained, shall be valid unless made
in writing and signed by duly authorized representatives of the parties hereto.

         18.      SURVIVORSHIP

         Sections 8 and 9 of this  Agreement  shall  survive any  expiration  or
termination of this Agreement.

         19.      USE OF NAMES

         Neither  party will use the name of the other party or its employees in
any  advertisement,  press release or publicity  with respect to the  Technology
without the prior written approval of the other party. University shall have the
right to acknowledge  Osteonix's  support of the research  performed  under this
Agreement in scientific publications and other scientific communications.

         IN WITNESS WHEREOF, the undersigned have entered into this Agreement as
of the date first set forth above.

UNIVERSITY:                                          OSTEX:

By   /S/ DONALD W. ALLEN                    By       ROBERT J. GLASER
     -------------------------------                 ----------------
     Donald W. Allen, Director                       Robert J. Glaser, COO
     Grant and Contract Services

Date:    11/21/96                                    Date:    10/23/96

                            University of Washington

                            Seattle, Washington 98105

To:                                 Ostex International, Inc.

Type of Support Requested: Research Grant (continuation)

Title of Project:                   Molecular Markers of Connective Tissue 
                                    Degredation

Principal Investigator:             David R. Eyre

Amount Requested:                   XXXXXX (including indirect costs)

Funding Period;                     XXXXXXXXXX

University office to be             Grant & Contract Services
contacted regarding                 3935 University Way NE, Box 355754
negotiation of award:               Seattle, Wa 98195
                                    Tel: 206-543-4043

Official authorized to

give University approval:                   /S/ DONALD W. ALLEN 
                                            -------------------------
                                            Donald W. Allen, Director

                            Grant & Contract Services

                                RESEARCH PROPOSAL

Title:                        Molecular Markers of Connective Tissue Degradation

Funding Period:               XXXXXXXXXXXXXXXXXX

PI:                                 David R. Eyre
                                    Orthopaedic Research Laboratories
                                    University of Washington

                                    Box 356500
                                    Seattle, WA 98195-6500

Sponsor:                            Ostex International, Inc.
                                    H. Raymond Cairncross
                                    Chairman and CEO
                                    2203 Airport Way South
                                    Seattle, WA 98134

SUMMARY

This is a continuation research proposal for an existing project, 
"Molecular Markers of Connective Tissue Degredation", funded from July 1, 1989 
to the present.XXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

<PAGE>

                                                                  BUDGET
                              Molecular Markers of Connective Tissue Degradation
                                                 (continuation project, XXXX)

XXXXXXXXXXXX

Personnel                       Position        Effort     Salary  Fringe  Total
- --------------          -----------             -------    ------  ------ ------
Lynne Atley, Ph.D.      Post-doctoral fellow    100%       XXX     XXX     XXX
Michael Harkey, Ph.D.   Research Associate      50%        XXX     XXX     XXX
MaryAnn Weis, B.S.      Manager-Research        25%        XXX     XXX     XXX
Ping Shao, B.S.         Res. Technologist       100%       XXX     XXX     XXX
Kristin Vosberg, B.S.   Res. Technologist       100%       XXX     XXX     XXX
Layne Norland, D.V.M.   Graduate Student        100%       XXX     XXX     XXX
                        Secretary               30%        XXX     XXX     XXX
                                                                        ------  
                                                                           XXX

EQUIPMENT
Micro-titer plate washer, XXXX; water baths, XXXX; Microcentrifuge, XXXX;
Pulsed power supply, XXXX; Controlled environment shaker XXXX; Gel
electophoresis system XXXX; Purchase of HPLC system for peptide 
fractionation, XXXX                                                        XXXX

SUPPLIES
XXXXXXXXXXXXXXXX
XXXXXXXXXXX and supplies
XXXXXXXXXXX and supplies
General chemicals and biochemicals
Plasticware, glassware and disposable                                      XXXX

TRAVEL
Investigators to acedemic scientific meetings                              XXXX

DISCRETIONARY BUDGET(64 series, separate account)
To sponsor research seminars, conferences, meals, travel and
entertainment expenses for visiting scientists, seminar speakers
and visitors to the University on Ostex-related business                   XXXX

OTHER
XXXXXXXXXXXX
XXXXXXXXXXXX. Shared
Costs of service contracts on major equipment, equipment
repairs and replacement, photographic services, publication
costs, computer charges, copying, postage, courier services
and telephone charges.                                                     XXXX
                                                                          ------
                                                           Total Direct    XXXX
                  (XX of modified total direct costs)    UW indirect costs XXXX
                                                                        --------
                                                           XXX Total       XXXX
<PAGE>

                                BUDGET FOR ENTIRE PROPOSED PROJECT-PERIOD

                                                     XXXX     XXXX      XXXX
                                                     XXXX     XXXX      XXXX
                                                     XXXX     XXXX      XXXX
                                                     XXXX     XXXX      XXXX
                                                   --------   -----   ---------
Salaries (+fringe benefits)                          XXXX     XXXX      XXXX
Equipment                                            XXXX     XXXX      XXXX
Supplies                                             XXXX     XXXX      XXXX
Travel                                               XXXX     XXXX      XXXX
Discretionary                                        XXXX     XXXX      XXXX
Other                                                XXXX     XXXX      XXXX
                                                   --------  ------   ---------
Total direct costs                                   XXXX     XXXX      XXXX
UW indirect costs                                    XXXX     XXXX      XXXX
 (XX of MTDC)                                     ---------  ------    ---------
           Total                                     XXXX     XXXX      XXXX

<PAGE>

BUDGET JUSTIFICATION

The  principal  investigator,  David  Eyre,  Ph.D.,  will  direct  the work
scientifically.  Lynne  Atley,  who spent 6 months with us in 1994 as a visiting
scholar,  will  complete  her Ph.D.  requirements  in Melbourne  (University  of
Melbourne)  by April 1996 and join us as a  post-doctoral  fellow.  She  trained
under Drs. John Wark and Peter Ebeling with her thesis research on bone turnover
markers,  and is keen to expand her knowledge of collagen  biochemistry and work
on novel  markers of skeletal  metabolism.  Working  100% on this  project,  her
efforts will focus on XXXXXXXXXXXXXXXXXXXXXas well as the application of the new
collagen-based  markers (types II and III) in clinical XXXXXXX.  Michael Harkey,
Ph.D.  is a molecular  biologist  studying the  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.
MaryAnn Weis, B.S. the laboratory's chief technician and research manager,  runs
the gas-phase  protein  sequencer (a core resource for all the scientific  aims)
and also has taken over project duties on O-CSF from Patricia  Woods,  B.S., who
left the laboratory in December 1995.  Ping Shao,  B.S., has worked full time on
the  project  for  over  four  years.   She  has   considerable   experience  in
XXXXXXXXXXXXX and in the running of immunoassays,  including  responsibility for
all NTx assays that we run in  collaboration  with  outside  investigators.  Her
responsibility  going  forward will be the  XXXXXXXXXXXXXXXX.  Kristin  Vosberg,
B.S., has worked full time on the project for over two years.  Her experience is
in preparing antisera,  running immunoassays  including Western blots and in the
preparation and analysis of XXXXXXXXX.  Her responsibility going forward will be
the  development  and  XXXXXXXXXXXX.  Layne Norland,  D.V.M.,  is studying for a
Masters degree in the Dept. of Comparative  Medicine.  His research project is a
collaboration with our laboratory, to investigate whether XXXXXXXXXXXXXXXXX.

<PAGE>

A. SPECIFIC AIMS

The primary focus of this project will continue to be... 

One Page Redacted
XXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

B. PROGRESS REPORT

The aims for the last three years in summary were to:

One half page redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

PROGRESS

Two pages redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

C.  RESEARCH PLAN

The scientific strategy is to ...

Four and one half pages redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.

<PAGE>

D.   PUBLICATIONS

The following papers and abstracts of meeting  presentations from the Orthopedic
Research Laboratories have resulted from or are related to this project.

Articles

1.  Niyibizi C, Bonadio J, Byers PH, Eyre DR.  Incorporation  of type I collagen
molecules that contain a mutant a2(l) chain  (Gly580-greater than Asp) into 
bone matrix in a  lethal case of osteogenesis imperfecta. J ' Bioi. 
Chem. 267:23108-23112,1992.
2.  Bogaert R,  Tiller GE,  Weis MA,  Gruber HE,  Rimoin DL,  Cohn DH,  Eyre DR.
Substitution  of glutamate for glycine 853 of the triple  helical domain of type
11 collagen produces hypochondrogenesis.  J. Biol. Chem. 267:22522-22526,  1992.
3.  Harris  ST,  Gertz BJ,  Eyre DR,  Genant HK,  Chesnut CH Ill.  The effect of
short-term  treatment with  alendronate  upon vertebral  density and biochemical
markers of bone remodeling. J. Clin. Endocrinol. Meth. 76:1399-1407, 1993.
4. Ezzat S, Melmed S, Endrew D, Eyre DR,  Singer FR.  Biochemical  assessment of
bone  formation  and  resorption  in  acromegaly.  J. Clin.  Endocrinol.  Metab.
76:1452-  1457,  1993. 
5. Bolien AM, Eyre DR. Direct  extraction of  gelatinases
from rat bone. Connect. Tiss. Res. 29:223-230, 1993.
6.  Gerstenfeld  LC, Riva A, Hodgens K, Eyre DR,  Landis WJ.  Post-translational
control of collagen  fibrillogenesis  in a mineralizing chick osteoblast culture
system. Bone Miner. Res. 8:1031-1043, 1993.
7. Gertz BJ, Shao P, Hanson DA,  Quan H, Harris ST,  Genant HK,  Chesnut CH 111,
Eyre  DR.  Monitoring  bone  resorption  in  early  postmenopausal  women  by an
immunoassay  for  cross-linked  collagen  peptides in urine.  J. Bone Miner Res.
9:135- 142, 1994.
8. Eyre, DR. New Molecular Markers of Bone Metabolism. Ther. Res. 15:1 00-1 1 1,
1994.
9.  Bollen A-M,  Eyre DR. Bone  resorption  rates in children  monitored  by the
urinary assay of collagen type I cross-linked peptides. Bone 15:31-34, 1994.
10. Bell NH,  Hollis BW,  Shary J, Eyre DR,  Eastell R,  Colwell A, Russell GRG.
Diclofenac  sodium is as effective as premarin in inhibiting bone resorption in
postmenopausal women. Am. J. Med. 96:349-353, 1994.
11.  Brenner  RE,  Vetter U,  Bollen  A-M,  Mike M, Eyre DR.  Bone  resorption
assessed by immunoassay of urinary  cross-linked  collagen  peptides in patients
with osteogenesis imperfecta. J. Bone Miner. Res. 9:933-937, 1994.
12.  Blumsohn A, Herrington K, Hannon RA, Shao P, Eyre DR, Eastell R. The effect
of calcium supplementation on the circadian rhythm of bone collagen degradation.
J. Clin. Endocrinol. Metab. 79:730-735, 1994.
13. Niyibizi C, Eyre DR. Structural  characteristics  of cross-linking  sites in
type V collagen of bone:  Chain  specificity's  and heterotypic  links to type I
collagen. Eur. J. Biochem. 224:934-950, 1994.
14.  Bogaert R,  Wilkin D,  Wilcox WR,  Lachman R,  Rimoin D, Cohn DH,  Eyre DR.
Expression  in cartilage of a 7-amino acid deletion in type 11 collagen from two
unrelated  individuals with Kniest dysplasia.  Am. J. Hum. Genet.  55:1128-1136,
1994.
15.  Bockman RS,  Wilhelm F, Siris E, Singer F,  Chausmer A, Sitton R, Kotier J,
Bosco BJ, Eyre DR, Levenson D. A multicenter  trial of low-dose  gallium nitrate
in patients with advanced Paget's disease of bone. J. Clin.  Endocrincl.  Metab-
80:595-602, 1995.

<PAGE>

16. Eyre DR, Wu J-J.  Collagen  structure and  cartilage  matrix  integrity.  J.
Rheumatol. 22(Suppl. 43):82-85, 1995.
17.  Eyre DR. The  specificity  of collagen  cross-links  as markers of bone and
connective tissue degradation. Acta Orthop. Scand. 66(Suppi. 266):166-170, 1995.
18. Key Jr. LL, Rodriguez RM, Willi SM, Wright NM, Hatcher HC, Eyre DR, Cure JK,
Griffin PP, Ries WL. Long term treatment of osteopetrosis with recombinant human
interferon   gamma:   An  18  month   clinical   trial.   N.   Engl.   J.   Med.
332(24):1594-1599, 1995.
19. Wu J-J, Eyre DR. Structural  analysis of cross-linking  domains in cartilage
type  Xi   collagen:   Insights   on   polymeric   assembly.   J.  Biol.   Chem.
270(32):18865-18870, 1995.
20.  Tiller GE,  Polumbo PA, Weis MA,  Lachman RS, Cohn DH,  Rimoin DL, Eyre DR.
Dominant   mutations   in  the   type  11   collagen   gene   (COL2Al)   produce
spondyloepimetaphyseal   dysplasia   (SEMD),   Strudwick  type.   Nature  Genet.
11(l):87-89, 1995.
21.  Steinmann  B,  Eyre  DR,  Shao  P.  Urinary  pyridincline   cross-links  in
Ehlers-Danlos Syndrome type VI. Am. J. Hum. Genet. 1995; 57:1505-1508.
22. Bolien A-M,  Martin MD, Leroux BG, Eyre DR.  Circadian  variation in urinary
excretion of bone collagen cross-links.  J. Bone Miner. Res. 1995;  10(12):1885-
1890.
23. Diab M, Wu J-J, Eyre DR. Collagen type IX from human cartilage: A structural
profile of intermolecular cross-linking sites. Biochem. J. 3 14:327-332, 1996.

Abstracts

1 . Diab M, Shapiro F, Eyre DR.  Abnormality  of type IX collagen in diastrophic
dysplasia. Trans. Ortho. Res. Cos. (San Francisco (1 8)S 1): 1 20, 1993.
2.  Caulfield MP, Morgan C, Carlton E, Brickman AS, Clemens JD, Eyre DR, Pandian
MR. Comparison of an immunoassay for cross-linked N-telopeptide of bone collagen
with HPLC detection of pyridinolines. The Endocrine Society, 1993.
3. Dickson IR, Arora MK,  Coombes RC, Shao P, Eyre D.  Pyridinolines  and cross-
linked type 1 collagen  N-telopeptides  as markers of bone  metastases in breast
cancer. J. Bone Miner. Res. 8(Sl):S288, 1993.
4. Lee MY, Woods PE,  Lottsfeldt  JL, Ramesh N, Osborne WRA, Eyre DR.  Isolation
and molecular  characterization of a murine osteoclast colony stimulating factor
(0- CSF). J. Bone Miner. Res. 8(Sl):Sl44, 1993.
5. Blumsohn A,  Al-Dehaimi AW,  Herrington K, Shao P, Eyre DR, Eastell R. Effect
of timing of calcium  supplementation  on the circadian  rhythm of bone collagen
degradation. J. Bone Miner. Res. 8(Sl):Sl58, 1993.
6.  Rodriguez  RR,  Ries WL, Eyre DR, Key LL.  Type I collagen  cross-linked  N-
telopeptide excretion by osteopetrotic patients during interferon gamma therapy:
A correlation with bone biochemical and  densitometric  markers.  J. Bone Miner.
Res. 8(Sl):S291, 1993.
7. Ebeling PR, Atley LM, Eyre DR, Guthrie J, Dennerstein L, Wark JD. Sensitivity
of type I collagen  N-telopeptide  cross-links  in  detecting  early  menopausal
changes in bone tumover. Proc. ANZ Bone Miner. Soc. A2, 1993.

<PAGE>

8.  Ebeling PR, Atley LM, Eyre DR, Shao P,  Guthrie J,  Dennerstein  L, Wark JD.
Sensitivity of collagen  N-telopeptide  cross-links and osteocalcin in detecting
early  menopausal  changes  in  bone  tumover.  Abstract  presented  at the  4th
lntemational symposoium on Osteoporosis in Hong Kong, March 1993.
9. Fiedelius C, Eyre DR, Christiansen C. Urinary type I collagen cross-linked N-
telopetides:  A new  marker for bone  resorption.  Poster  presented  at the 4th
International Symposium on Osteoporosis in Hong Kong, March 1993.
10. Eyre DR,  Bogaert R, Diab M, Hanson D, Knigge P, Niyibizi C, Weis MA, Wu ii.
Studies  on the  molecular  structure  of  collagen  heteropolymers  in bone and
cartilage.  Presented  at  the  5th  International  Conference  on  Osteogenesis
Imperfecta, September 27-30, 1993, Oxford, England.
11.  Kanthawatana  S, Eyre DR,  Hendeles  L. The effect of short  course of oral
prednisone  on a  biochemical  marker  of bone  resorption.  Xllth  Intemational
Congress of Pharmacology. Montr6al, Qu6bec, July 1994.
12. Apone S, Fevold K, Lee M, Eyre D. A rapid method for quantifying  osteoclast
activity in vitro. J. Bone Miner. Res. 9(Sl):Al2O, p. S178, 1994.
13. Clemens JD,  Herrick- M, Singer FR, Rosen HN, Shao P, Eyre DR.  Cross-linked
N-  telopeptides  of type I collagen in human serum as a  biochemical  marker of
bone resorption. J. Bone Miner. Res. 9(Sl):A5-72, p. S228, 1994.
14.  Prior JC,  Eyre Dr,  Ebeling  PR,  Wark,  JD.  Trabecular  bone loss  after
premenopausal   oophorectomy   is  not  prevented  by  con'ugated   estrogen  or
medroxyprogesterone--a  double-blind,  randomized  1-year study.  J. Bone Miner.
Res. 9(Sl):C294, p. S394, 1994.
15. Key LL,  Rodriguez RM,  Hatcher H, Eyre DR, Ries WL. Long term  treatment of
osteopetrotic  patients with interferon gamma. J. Bone Miner. Res. 9(Sl):72,  p.
S138, 1994.
16. Sowers M-F, Eyre, D, Hollis,  BW.  Changes in bone tumover  markers and bone
density with lactation. J. Bone Miner. Res. g(Sl):A512, p. S2p7, 1994.
17.  Jackson G,  Hollis BW, Eyre DR,  Baylink  DJ, Bell NH.  Effects of race and
calcium  intake on bone  markers and calcium  metabolism  in young adult men. J.
Bone Miner. Res. 9(S 1):Al 78, p. S 1 85, 1994.
18.  Ebeling PR, Eyre DR,  Gurthrie J,  Dennerstein  L, Wark JDF.  Prediction of
early menopausal bone loss by biochemical  markers of bone turnover.  Amer. Soc.
Bone Miner. Res., Kansas City, MO, September 1994.
19. Wu JJ, Murray J, Eyre DR.  Evidence foi  copolymeric  cross-linking  between
types 11 and Ill collagens in human articular cartilage. ORS, Atlanta, 1996.
20. lchimura S, Wu JJ, Eyre DR. A sensitive method for collagen type IX peptide-
mapping in human cartilage. ORS, Atlanta, 1996.
21. Wang C, Eyre DR, Clark R,  Kleinberg D,  lranmanesh  A, Dudley RE, Berman N,
Swerdloff RS. Sublingual testosterone  replacement decreases bone resorption and
increase  bone  formation   markers  in  hypogonadal   men.  Int.   Congress  of
Endocrinol., 1996.


<PAGE>


                University of Washington Hazardous Materials Use

                             Complete and Return to

                      Environmental Health and Safety GS-05

A.  Principal Investigator:         David R. Eyre. Ph.D.
B.  Department:            Orthopaedics

C.  Building:              Health Sciences           Room #:           BB1052
D.  Phone No.:             543-4700

E.  Mail Stop:             Box 356500

F. Co-investigator(s)      _________________________ ______________________

                           ========================= ======================
G  Title of Project or Proposal.
Molecular Markers of Connective Tissue Degradation
<TABLE>
<CAPTION>

                                                                                        Yes      No
<S>                                                                                     <C>      <C>           
1.  Will Hazardous Materials be used or stored in your laboratory?                      x
2.  Have you and your employees received Hazard Communication training?                 x
3.  Will your research include the use of substances of high acute toxicity,            x
reproductive toxins, carcinogens, mutagens, or teratogens?
4.  Is there a chemical inventory available for your laboratory?                                 x
5.  Do you have access to a computer that is in or near your laboratory for the
purpose of accessing networked safety information?                                      x
6.  Are you familiar with the UW's Hazardous Waste Disposal Guidelines?                 x
7.  Doe your laboratory contain the following?
</TABLE>

         A.       X        FIRE EXTINGUISHERS?
         B.       X        FLAMMABLE LIQUID STORAGE CABINETS?
         C.       X        BIOLOGICAL SAFETY CABINETS?
         D.       X        FUME HOODS (ANY TYPE)?
         E.       _        RESPIRATORS AND REPLACEMENT CARTRIDGES?
         F.       X        PROTECTIVE GLOVES (LATEX, NITRILE, VINYL, ETC.)?
         G.       X        COMPRESSED GASES?

         H.       X        EYE WASHES?

         I.       X        EMERGENCY SHOWER WITHIN 100 FT. OF THE LAB?
         J.       X        ROOM WINDOWS THAT OPEN?

8.  Please  list on the back of this form any  special  hazards  or  precautions
associated with the use of chemicals in your research?


<PAGE>


               University of Washington Biohazard Activity Review

                             Complete and Return to

                    Environmental Heath and Safety Box 354400

A.  Principal Investigator:         David R. Eyre. Ph.D.
B.  Department:            Orthopaedics

C.  Building:              Health Sciences   LAB Room #:   BB1052, 1054, 1032
D.  Phone No.:             543-4700
E.  Box:                   356500                  E-Mail:  [email protected]
F. Co-investigator(s)      _________________________ ______________________

                           ========================= ======================
G  Title of Project or Proposal.
Molecular Markers of Connective Tissue Degradation

__ Check here if project is non-competitive renewal and skip to Section M

                                                                     Yes      No

H.  Is your lab engaged in the following areas of biohazard activity?

1.  Activities involving non-human primates, including blood, tissues and/or 
body fluids from non-human primates.                                 __       x

2.  Activities involving other animals or animal blood and tissues:

         Animal Type: XXXXXX

         a.       Commercially raised laboratory animals.         x        __
         b.       Feral (wild caught) animals.                    __       x

3.   Activities involving human blood, tissues, body fluids and excreta.
         a.       Have all personnel received Hepatitis B vaccinations?

                  (See UW Exposure Control Plan or call 543-7278 for

                  more information.)                                x        __
         b.       Does the laboratory have an exposure control plan?
                  (if yes,  answer  Section  I. below.)             x        __

4.   Activities involving contact with cultures or specimens which may contain
microorganisms (including viruses). Culture Type:  ___________      __       x

5.   Activities involving recombinant DNA. (All projects involving recombinant
DNA must be registered with the UW  Recombinant  DNA  Committee,
regardless of  containment level.  See Section III., pages 2-5 of the 
"University
Biohazard Safety Manual" or call EH&S at 543-7278 regarding non-competitive
grant renewals.)                                                     __       x

I.  Does your laboratory exposure control plan cover:
         1.       Procedures on use of personal protective equipment and

                  clothing?                                          x        __
         2.       Procedures for handling hypodermic needles, glass, pipettes
                  and biological wastes?                             x        __
         3.       Immunization and medical surveillance program(s)?  x        __
         4.       Personnel training?                                x        __

If the answer to any or part of section H. is "Yes" , please complete the next 
page.


<PAGE>


University of Washington
Biohazard Activity Review

Page 2 of  2

                                                                       Another

J.  Does this project require the use of?                   In Lab*    Location
         1.       Laminar flow biological safety cabinets.   x             __
         2.       Centrifuge                                 x             __
         3.       Autoclave                                  x             __
         4.       Sonication Equipment                       x             __

*equipment located in rooms listed on first page.

K.  Submit the following with this form.

         1 .      A copy of the GC-1 form.

         2.       An assessment of the possible risks from biohazards and a 
                  brief summary of the biosafety
                  precautions followed.

         3.       Any comments received from departmental review of the project.

         4.       A summary of the proposed project written in lay terms and/or
                  a copy of the application
                  being submitted for grant support

L. If Class III agents* are involved submit the following additional information
 with this form:

         1.       A resume of the training and experience of each person who
 will participate in the  project

         2.       A description  of laboratory  facilities  available  including
                  containment equipment such as biological safety cabinets, etc.
                  Include  a  statement  by   Environmental   Heath  and  Safety
                  assessing the adequacy of containment facilities.

         +        Consult UW Biosafety Manual for classification of agents.

Note:    Work with Class IV agents will not be approved at the
         University of Washington as appropriate facilities are not

         available.

M.  If this is a non-competitive renewal of funded grant and there are no 
significant changes in the project from
the original submittal, submit the following:

a.       A copy of the new GC-1 form.

b.       a brief summary of the new year's proposed activity.

                          For more information contact

                      EH&S Biosafety Specialist at 543-7278


<PAGE>
Form HS SR-1 trev
BOX FOR COMMITTEE USE ONLY

                                                       MASTER        ___
                                                       COMMITTEE     ___
                                                       REVIEWER      ___
                                                       INVESTIGATOR   X

25-763-E
APPLICATION NUMBER


UNIVERSITY OF WASHINGTON
HUMAN SUBJECTS DIVISION BOX 355752

STATUS REPORT:  Application no. 24-112-E
__      DO NOT RENEW.  Complete items 1-6 of Status Report and return form.
XX      RENEW WITH MINOR OR NO CHANGES.  Complete items 1-10 of Status Report;
- --      submit one original plus three (3) copies of this form.
        RENEW WITH CHANGES IN PROCEDURES, POPULATION, OR PURPOSE:  Complete 
        and submit nine (9) copies of a new HSRC application (UW 13-11) and 
        this Status Report (items 1-10).

Investigator's name, position, division and department, mail stop and telephone
 number:
David R. Eyre, Ph.D., Professor, Dept. of Orthopaedics, Box 356500, 543-4700
Title of Human Subjects Application:
Connective Tissue Research   XXXXXXXXXXXXXXXXXXXXXXXXXXXX
Brief summary of findings to date (add sheets if necessary):
SEE ATTACHED
4.      Number and types of adverse events. complaints, and withdrawals and 
how they were handled (add sheets if necessary):
        NONE.
5. No. of subjects enrolled in study to date:                     
   XX Normals/Controls XX Patients/Cases
6. No. of subjects added during past year of approval:             
   XX Normals/Controls XX Patients/Cases
7. No. of subjects continuing participation:  N/A See attached.    
   XX Normals/Controls XX Patients/Cases
8. How many new subjects will join the study over the next year?   
   XX Normals/Controls XX Patients/Cases
9. Do you propose any minor changes in this study or consent form?  
   X  No.  ___  Yes.  If yes, describe (add sheets if necessary).  
   Submit 4 copies of revised consent form and other materials, if appropriate.
10. Provide information for all funding, awarded or proposed for this activity 
(add sheets if necessary).
Type:  XX research grant, __ contract, __ fellowship, __training grant, 
       __ other, explain:
Name of principal investigator:  David R. Eyre, Ph.D.
Name of agency:  SEE ATTACHED.          Agency's no. (if assigned):
Title of proposal:  SEE ATTACHED                SEE ATTACHED
Inclusive dates:  from SEE ATTACHED, through ________________
Submitted through Grant and Contract Services? __ No  XX Yes  __ VAMC  __Other:
HSRC Chair's signature:  ____________________  Date June 08, 1995  Approve XX 
Disapprove __
Subject to the following conditions:


Period of approval is one year, from 06-08-95 through 06-07-96.
* VALID ONLY AS LONG AS APPROVED PROCEDURES ARE FOLLOWED *

<PAGE>

 Washington, Comparative Medic                                 01/30/1996
- - Protocol Description
Eyre, David R.                  BOX 356500

PROTOCOL:  2547-03                                   Last Update:  01/30/1996
Immunoassay Assessment of Type I and Type II Collagen Degradation in the
Received:  11/15/1995   Approved:  11/16/1995   Sig. Chg.:  01/25/1996
   Expires:  11/15/1996 Vet Appr.:  01/25/1996
Funding sources:  Ostex International

PI:  Eyre, David R.           Mail:  BOX 356500   S/D:  / Orthopaedics
Contacts:                     Function                Phone           Emergency
  Norlund, Layne              C                       543-0474/       685-8932

Species:  11    XXXXXXXXXXX             Strain:  XXXXXXX
Vivarium:  01                   Lab Room:  01 G609,D604         Oper. Room:
                     1  2       3       4       Total
Approved:            X  X       X       X       XXX
Ordered:        XXX     X       X       X       XXX
Adjusted:          XX   X       X       X          XX
Remaining:         XX   X       X       X          XX

        Y-Drug administration   Y-Blood sampling                Y-Euthanasia
        Y-Collection of tissue          Y-Withhold meds

NO CONDITIONS

Protocol Summary:
        21.  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 




<PAGE>


Note:  Confidential treatment requested.  Exhibit omits information that has
       been filed separately with the Securities and Exchange Commission.       

Research Agreement
Dr. Minako Y. Lee

                               RESEARCH AGREEMENT

         This RESEARCH AGREEMENT is entered into as of the 1st day of September,
1996, by and between OSTEX INTERNATIONAL, INC., a Washington corporation, having
its principal place of business at 2203 Airport Way South,  Suite 400,  Seattle,
Washington  98134  ("Ostex"),  and the  UNIVERSITY  OF  WASHINGTON,  having  its
principal office at Seattle, Washington 98195 (the "University").

                                    RECITALS

         A.  Ostex  has an  ongoing  interest  in  certain  research  technology
(including  inventions,  processes,  formulae  and  the  like,  whether  or  not
patentable,  and property eligible for copyright  protection)  entitled "Role of
O-CSF in Osteoclast  Regulation," as more particularly  described in "Exhibit A"
attached hereto (the "Technology").

         B. The Technology has been assigned by the University to the Washington
Research  Foundation  ("WRF") pursuant to Section 3.3 of that certain Technology
Administration Agreement, dated January 1, 1985, between the University and WRF,
as amended  (the "UW  Agreement").  Pursuant to that certain  Exclusive  License
Agreement between Ostex and WRF, dated October 20, 1989 (the "Exclusive  License
Agreement"),  WRF granted Ostex an exclusive,  worldwide  license to make,  have
made, assign, sublicense,  lease, develop, enhance, modify, produce,  reproduce,
demonstrate,  market,  promote,  sell,  distribute,  use,  exploit and otherwise
commercialize and prepare derivations of the Technology.

         C. Ostex and the  University  entered into a Research  Agreement  dated
November  1,  1992,  pursuant  to which  Ostex  funded  the first two years of a
research  program to be conducted by the  University  relating to the Technology
(the "Research Program").

     D. It is in the  mutual  interest  of  Ostex  and the  University  that the
Research Program be continued pursuant to this Agreement.

         E. Ostex is willing to fund  the XXXXXXXXXXX of the Research Program at
and  through  the  University  of  Washington,   Department  of  Biological
Structure, and the University desires to obtain such funding, all subject to and
in accordance with the terms and conditions set forth in this Agreement.

<PAGE>

                                   AGREEMENTS

         In consideration of the covenants and promises contained herein and for
other good and valuable consideration,  the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

         1.       SCOPE AND SCHEDULE

         The Research Program shall be conducted in accordance with the research
proposal  attached  hereto  as  "Exhibit  A" and  incorporated  herein  by  this
reference (the "Research  Proposal"),  and in accordance with mutually agreeable
written modifications  thereof. The Research Program shall be carried out during
the Program Period (as defined below),  unless sooner  terminated or extended as
herein provided.

         2.       PROGRAM PERIOD

         The Program Period initially will be XXXX in duration; commencing XXXX
and  expiring  XXXX,  provided,  however,  that the  parties  may by mutual
agreement  reached no less than  thirty (30) days prior to  expiration  XXXXXXX,
extend the Program Period  forXXXXXXXXXXXXXXXXXXXXXX to commence XXXX and expire
XXXX.

         3.       OSTEX'S PRINCIPAL OBLIGATIONS

                  3.1 During  XXXXXXXXX of the Program  Period,  Ostex shall pay
the University the sum of XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX to cover
all direct  and  indirect  costs of the  corresponding  portion of the  Research
Program, as set forth in the budget section of the Research Proposal.

                  3.2 In the event that the Program  Period is  extended  beyond
XXXXXXX in accordance  with Section 2 above,  Ostex shall during XXXXXXX pay the
University the sum of XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX to cover all
direct and indirect costs of the corresponding  portion of the Research Program,
as set forth in the budget section of the Research Proposal.

         4.       PAYMENT TERMS

                  4.1 During XXXXXXX of the Program  Period,  Ostex shall,  upon
receipt of invoices from the University, pay the University the amount specified
in Section 3.1 above, in accordance with the following schedule:

               PAYMENT DATE                         PAYMENT AMOUNT

         -XXXXXXXXXXXXXXXXXXXXXXXXXXXX                  XXX
           XXXXXXXXXX

         - XXXXXXXXXXXXXXXXXXXXXXXXXXX                  XXX 
         - XXXXXXXXXXXXXXXXXXXXXXXXXXX                  XXX
         - XXXXXXXXXXXXXXXXXXXXXXXXXXX                  XXX

<PAGE>

                  4.2 In the event that the Program  Period is  extended  beyond
XXXXXXX,  Ostex shall,  upon receipt of invoices  from the  University,  pay the
University  during  XXXXXXX  the  amount  set forth in  Section  3.2  above,  in
accordance with the following schedule:

               PAYMENT DATE                         PAYMENT AMOUNT

         - XXXXXXXXXXXXXXXXXXXXXXXXX                   XXX
         - XXXXXXXXXXXXXXXXXXXXXXXXX                   XXX
         - XXXXXXXXXXXXXXXXXXXXXXXXX                   XXX
         - XXXXXXXXXXXXXXXXXXXXXXXXX                   XXX 

                  4.3 The  University  shall submit its  customary  statement of
expenses  incurred under this Agreement within thirty (30) days after the end of
each six-month interval of the Program Period.

         5.       PRINCIPAL INVESTIGATOR

         For purposes of this Agreement,  and pursuant to University policy, Dr.
Minako Y. Lee is designated the principal  investigator of the Research  Program
("Principal Investigator").  The Principal Investigator shall be responsible for
the  direction  and content of the Research  Program,  including  budgeting  and
budget revisions necessary to accomplish the objectives of the Research Program.
Should  the  Principal  Investigator  leave  the  employ  of the  University  or
otherwise   become   unavailable   to  fulfill  her   obligations  as  Principal
Investigator   during  the  Program  Period,   the  University  may  nominate  a
replacement for the position of Principal  Investigator.  If such replacement is
not  acceptable  to Ostex,  the  Research  Program and budget  contained  in the
Research Proposal may be modified to reflect a reduced scope of work, or, at the
option  of Ostex,  may be  terminated  upon  sixty  (60)  days'  notice,  unless
arrangements  acceptable to Ostex can be made to  subcontract  with the departed
Principal  Investigator,  or the  institution at which she is then employed,  to
continue the work described in the Research Proposal.

         6.       CONFIDENTIALITY

         Neither  party  shall  furnish  to  the  other  any   confidential   or
proprietary  information of any third party in connection  with this  Agreement.
Any such information which one party wishes to furnish to the other shall be the
subject of a separate confidentiality agreement between the parties.

         7.       DATA REPORTS AND FACILITIES

                  7.1 The  University  shall,  in  accordance  with  established
University practice,  keep complete,  accurate,  and authentic accounts,  notes,

<PAGE>

data, and records of the work  performed  under this Agreement and shall provide
Ostex with reports  within thirty (30) days  following the end of each six-month
interval of the Program Period. The University shall furthermore submit to Ostex
a  written  and  comprehensive  final  report  within  ninety  (90)  days  after
termination of the Research Program.

                  7.2  At  the  discretion  and  convenience  of  the  Principal
Investigator during the course of the Research Program,  Ostex's representatives
and others  designated by Ostex may be present as observers while various tests,
inspections  and other  aspects of the  Research  Program  are being  conducted.
Ostex's  representatives may consult informally with the Principal  Investigator
regarding the Research Program both personally and by telephone.  The University
acknowledges  and  agrees  that  the  Principal  Investigator  may  serve  as  a
consultant to Ostex during the term of this Agreement.

                  7.3 From its own  resources  and  those  provided  under  this
Agreement,  the University  agrees to make available  laboratory  facilities and
equipment for the Research Program.

         8.       INVENTION RIGHTS

                  8.1 The  University  acknowledges  and  agrees  that:  (i) all
Technology made,  developed or conceived on or before the date of this Agreement
has been  assigned to WRF  pursuant to Section 3.3 of the UW  Agreement,  and no
commitments  have been made with respect to such Technology  pursuant to Section
3.2 of the UW Agreement;  (ii) all Technology made, developed or conceived after
the date of this  Agreement  will be submitted to WRF pursuant to Section 3.1 of
the UW Agreement;  (iii) no  commitment  will be made pursuant to Section 3.1 of
the UW Agreement with respect to Technology  made,  developed or conceived after
the date of this  Agreement  unless Ostex agrees to such  commitment in writing;
and (iv) the  University  shall not  terminate,  amend,  waive or enforce the UW
Agreement,  or any rights or  obligations  thereunder,  in any manner that could
adversely  affect  Ostex's  rights under this  Agreement  unless Ostex agrees in
writing to such termination, amendment, waiver or enforcement.

                  8.2 The University  shall have no right,  title or interest in
any Technology made, developed or conceived by employees or consultants of Ostex
entirely without the use of University facilities.

         9.       PUBLICATION

         The University  will not be restricted  hereunder  from  publishing the
results of research conducted under this Agreement within a reasonable period of
time following  their  availability.  The University  will provide a copy of all
manuscripts to Ostex prior to their  presentation or submission for publication.
In order to  protect  fully the  rights  of the  University  and of  Ostex,  any
contemplated  publication  or  other  dissemination  containing  details  of  an
invention,   whether  or  not  patentable,  will  be  withheld  until  a  patent

<PAGE>

application is filed or other appropriate steps to protect commercial value have
been completed.  Such withholding shall be kept to a minimum and will not exceed
six (6) months, except by mutual agreement between Ostex and the University.

         10.      INDEMNIFICATION

         The  University  and Ostex each agree to  indemnify  and hold the other
party  harmless  from  damage to persons or property  resulting  from any act or
omission on the part of itself, its employees, its agents, or its officers.

         11.      NOTICES

         Any  notice  to be given  hereunder  shall be in  writing  and shall be
deemed received by the addressee on the day delivered if delivered by courier on
a  business  day,  or on the fifth  business  day  following  mailing if sent by
first-class,  certified  or  registered  U.S.  mail,  postage  prepaid,  to  the
following address:

if to the University:   Director, Grant and Contract Services
                        3935 University Way, N.E., JM-24
                        Seattle, Washington 98195

if to Ostex:            Ostex International, Inc.
                        2203 Airport Way South, Suite 301
                        Seattle, Washington 98134
                        Attention:  President

         12.      TERMINATION

                  12.1 This Agreement shall terminate upon the expiration of the
Program  Period as  defined  in Section 2 above;  provided,  however,  that this
Agreement  may be  terminated by either party prior to expiration of the Program
Period upon sixty (60) days' prior written notice, if such party determines,  in
its  discretion,  that the Research  Program is no longer  feasible or desirable
academically,  technically,  or  commercially.  Upon receipt or delivery of such
notice of termination,  the University  shall exert its best efforts to limit or
terminate any outstanding  financial  commitments for which Ostex is responsible
hereunder,  and  Ostex  shall  reimburse  the  University,  to  the  extent  not
previously reimbursed, for all costs incurred by the University for the Research
Program,  including,  without  limitation,  all obligations not cancelable.  The
University  shall  furnish,  within  sixty  (60) days of the  effective  date of
termination,  a final report of all costs  incurred  and all funds  received and
shall  reimburse  Ostex for payments  which may have been  advanced in excess of
total costs incurred, with no further obligations to Ostex.

                  12.2  Notwithstanding  paragraph 12.1 above, in the event that
either party shall be in default of any of its obligations  under this Agreement

<PAGE>

and shall fail to cure such  default  within  thirty  (30) days after  receiving
written  notice  thereof,  the party not in  default  shall  have the  option of
terminating  this  Agreement  by giving  written  notice of  termination  to the
defaulting party, which shall be effective thirty (30) days after delivery.

                  12.3 Termination of this Agreement shall not affect the rights
and obligations of the parties  accrued prior to termination,  or the rights and
obligations set forth in Section 8 above.

         13.      WARRANTS AND COVENANTS BY UNIVERSITY

                  13.1 The University  hereby warrants that it has the right and
authority  to enter  into  this  Agreement  and that the  representatives  whose
signatures  appear hereunder are duly authorized by the University to enter into
this Agreement on behalf of the University.

                  13.2 The University covenants that it will not knowingly enter
into any agreement with any  industrial or commercial  funding source other than
Ostex if such agreement would be inconsistent with the University's  obligations
hereunder.

         14.      GOVERNING LAW

         This  Agreement  shall be governed by and construed in accordance  with
the laws of the State of Washington.

         15.      ARBITRATION AND JURISDICTION

                  15.1 At the request of either party, any  controversy,  claim,
or dispute  arising out of or relating to any provision of this Agreement  shall
be  settled  by  arbitration  to  be  conducted  in  Seattle,  Washington.  Such
arbitration  shall be  conducted  in  accordance  with the rules  applied by the
American  Arbitration  Association.  Judgment  upon any award  rendered  through
arbitration may be entered into any court of competent jurisdiction.

                 15.2     Ostex and the University agree to submit to 
jurisdiction in Seattle, Washington.

         16.      SUCCESSORS AND ASSIGNS

         This Agreement,  including the indemnification provisions hereof, shall
be binding upon and inure to the benefit of the parties hereto, their respective
successors, assigns, and legal representatives.  Ostex may assign this Agreement
to any successor to all or  substantially  all of its business and assets.  This
Agreement  shall not  otherwise be  assignable by either party without the prior
written consent of the other.

<PAGE>

         17.      NO ORAL MODIFICATION

         No  change,  modification,  extension,  termination  or  waiver of this
Agreement,  or any  provision  herein  contained,  shall be valid unless made in
writing and signed by duly authorized representatives of the parties hereto.

         18.      SURVIVAL

         Sections 8 and 9 of this  Agreement  shall  survive any  expiration  or
other termination of this Agreement.

         19.      USE OF NAMES

         Neither  party will use the name of the other party or its employees in
any  advertisement,  press release or publicity  with respect to the  Technology
without the prior written approval of the other party. The University shall have
the right to acknowledge  Ostex's  support of the research  performed under this
Agreement in scientific publications and other scientific communications.

         EFFECTIVE as of the day and year first set forth above.

UNIVERSITY:                                          OSTEX:

By   /S/ DANALD A. ALLEN                 By  /S/ JOHN M. BRENNEMAN
     Donald W. Allen, Director,          John M. Brenneman, Director of Finance
     Grant and Contract Services

     11/21/96                            10/22/96
     Date of signature                   Date of signature


<PAGE>




EXHIBIT A

Continuation of Research proposal:

Role of O-CSF in Osteoclast Regulation

For XXXXXXXXXXXXXXXXXXXXXXXXXXX

Submitted to:

OSTEX International Inc.
2203 Airport Way, S., Suite 301
Seattle, WA.  98l34
Tel: (206) 292-8082
Fax: (206) 292-8625

Principal Investigator:

Minako Y. Lee, ,M.D.
Research Associate Professor
Department of Biological Structure
SM-20

University of Washington
Seattle, WA.  98195
Tel: (206) 685-1514
Fax:(206) 543-1524

1

Lee, Minako Y.

<PAGE>

Budget Request for XXXX X XXXXXXXXXXXXXXXXXX

DETAILED BUDGET FOR THE FIRST 12 MONTHS


Personnel:

Name              Role              %        Salary   Fringe  Total
M. Y. Lee         P.I              40%        XXX      XXX    XXX
Y Igarashi        Senior Fellow    30%        XXX      XXX    XXX
L. Ferguson       Res Tech I       100%       XXX      XXX    XXX
Q. Dang           Hourly                      XXX      XXX    XXX

Subtotal personnel:                                           XXX

Equipments:

Microcentrifuge XXXX, Tissue homogenizer XXXX                 XXX

Supplies:

XXXXXXXXXXXXXXX                                               XXX
XXXXXXXXXXXXXXX                                               XXX
XXXXXXXXXXXXXXX                                               XXX
XXXXXXXXXXXXXXX                                               XXX
XXXXXXXXXXXXXXX                                               XXX
Others XXXX, equipment repair, service: XXX
publication: XXX, photocopies, postage: XXXX                  XXX
XXXXXXXXXXXXXXX                                               XXX
Housing in XXXXXXXXXXXXXXX                                    XXX
Subtotal for supplies:                                        XXX

Total direct costs:        XXX           xxxxxx   Indirect Costs:   xxxxxx

                        xxxxxx          xxxxxx    Indirect Costs:   xxxxxx

Total direct costs for the next XXXX period  xxxxxx  Indirect Costs:  xxxxxx

Total direct and indirect for next XXXX period:  XXXX

<PAGE>



                     xxxxxx   xxxxxx

Personnel
         Salaries    xxxxxx   xxxxxx
         Fringe      xxxxxx   xxxxxx
         Total       xxxxxx   xxxxxx

Equipment            xxxxxx   xxxxxx

Supplies          xxxxxx   xxxxxx

Total             xxxxxx   xxxxxx

BUDGET JUSTIFICATION:

     We are  requesting  salaries  for  personnel  who  will be  working  on the
proposed project at a % effort as indicated.  Dr. Lee will spend xxx of her time
as P.I. A proposed  salary is  commensurate  with her  experience  and  academic
level.  Dr.  Igarashi,  Ph.D.  in  biochemisty,  is an  associate  professor  in
Biochemistry  at Dokkyo  University  School of Medicine,  Japan.  He came to our
laboratory in April 95 as a visiting  scholar to work for 2 years.  He is a well
experienced  biochemist in protein  purification and molecular biology,  and his
contribution  is  very  helpful  to  our  program.  He  will  work  with  us  on
XXXXXXXXXXXX. He needs 30% of his salary support in next year. Ms. Ferguson will
provide  technical  assistance in XXXXX involved in the proposal.  Mr. Dang will
XXXXXXX.

Fringe benefit is calculated at 22% for PI, 25% for the fellow, and 30% for the
research technologist, according to the institutional regulation.  Annual 
inflation rate is calculated at 4%.

Indirect cost rate is as per current agreement between  University of Washington
and OSTEX International Inc.


<PAGE>


Research Proposal:  Role of O-CSF in Osteoclast Regulation

A) SPECIFIC AIMS

One half page redacted
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

B) BACKGROUND AND SIGNIFICANCE:

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
responsible  for  bone   resorption.   It  is  now  well  established  that
Ostoeclasts  are  derived  from  a   hematopoietic   stem  cell  population  and
multinucleated  functional  osteoclasts  are formed by the fusion of mononuclear
precursor  cells  (1,2).  Although it has been  clearly  shown that  osteotropic
hormones such as 1,25  dihydroxyvitamin  D3 (vitamin D3) or parathyroid  hormone
(PTH) play  important  roles in the process of functional  osteoclast  formation
(3), mechanisms of immature  osteoclast  development in the bone marrow is still
poorly understood. Nonetheless, recent studies have gradually revealed that more
and  more  complex  mechanisms  are  involved  in  differentiation  of  immature
osteoclasts from the heterogenous hematopoietic cell population.  Involvement of
not only various interleukins, colony stimulating factors (CSF), growth factors,
and/or  hormones but also soluble  receptors of cytokines (4) and marrow stromal
cell elements have been  suggested to play roles at various stages of osteoclast
development (3).XXXXXXXXXXXXXXXXXXXXXXXXXXX

The remaining page unsder background and significance is redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


<PAGE>

C) PROGRESS REPORT/ PRELIMINARY STUDIES

Following studies have been conducted in collaboration with laboratories of 
Dr. David Eyre, Department of Orthopedics, Dr. William Osborne, Department of 
Pediatrics, both at the University of Washington, and Dr. Stephen Apone, Ostex
International. Inc.

Two pages redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

PRELIMINARY STUDIES

Two and one half pages redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

<PAGE>




Publications:

M.Y.Lee, P.E.Woods, J.L.Lottsfeldt, N.Ramesh, W.R.A.Osborne, D.R.Eyre: Isolation
and molecular  characterization of a murine osteoclast colony stimulating factor
(O-CSF). J Bone Mineral Research 8: S144, 1993.

T.H.Lee,  K.L.Fevold,  Y.Muguruma,  J.L.Lottsfeldt,  M.Y.Lee.  Relative roles of
osteoclast colony-stimulating factor and macrophage colony stimulating factor in
the course of osteoclast development. Exp Hematol 22:66-73, 1994.

Stephen Apone, Karen Fevold, Minako Lee, David Eyre: A rapid method for  
quantifying osteoclast activity in vitro.  J Bone Mineral Research 9:S178, 1994.

Y.Hayase,  M.Y.Lee:  Osteoclast progenitors develop from primitive hematopoietic
stem cells. Exp Hematol 22:(8), 755, 1994.

Y.Mugururna,   M.Y.Lee:   Osteoclast   progenitors   express  c-Kit,  but  their
differentiation  appears independent of stem cell factor.  Abstract submitted to
the annual meeting for the American Society of Hematology, 1995.

L.E.Purton,  M.Y.Lee,B.Torok-Storb.  Normal human peripheral  blood  mononuclear
cells mobilized with granulocyte  colony-stimulating  factor contain  osteoclast
progenitors.  Abstract  submitted to the annual meeting for the American Society
of Hematology, 1995.

<PAGE>



D) Research plan:

Four pages redacted
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX 


<PAGE>

WORK SCHEDULE:
Aim 1 XXXXXXXXXXXXXXXXXXXX
Aim 2 XXXXXXXXXXXXXXXXXXXX
Aim 3 XXXXXXXXXXXXXXXXXXXX


References:

1.  SudaT.  et al., Modulation of osteoclast differentiation.  Endocrine 
Reviews. 13:66-80,1992
2.  Nijweide,PJ.  and GroothR. Ontogeny of the osteoclast. In Biology and 
Physiology of the Osteoclast.  Rifkin, BR and Gay CV eds. p82-97.  CRC press, 
Boca Raton, Florida 1992
3.  Chambers,TJ. Regulation of osteoclast development and function. ibd.
p 106-128.
4.  Tamura, T. et al., Soluble interleukin-6 receptor triggers osteoclast 
formation  by interleukin 6.  Proc. Natl Acad. Sci. 90:11924-1928, 1993
5. Lee, MY., Eyre,  DR.,  Osborne,  WRA.  Isolation of a murine  osteoclast
colony stimulating factor. Proc. Natl. Acad. Sci. 88:8500-8504,1991 
6. Lee, MY.,
Lottsfeldt,  JL. Fevold, KL.  Identification and  characterization of osteoclast
progenitors by clonal analysis of hematopoietic cells. Blood 80:1710-1716,  1992
7.  Metcalf,D.   Hematopoietic   regulators.   Redundancy  or  Subtlety?   Blood
82:35l5-3523, 1993
8.  Kaushansky,   K.,  Lin,N.  and  Adamson,J:   Interleukin  1  stimulates
fibroblasts  to  synthesize   granulocyte-macrophage   and  granulocyte   colony
stimulating factors.  Mechanisms for the hematopoietic response to inflammation.
J Clin Invest 81: 92-97,  1988 
9. Thomson,  B.M.,  Saklatvala,  J. and Chambers,
T.J:  Osteoblasts  mediate  interleukin 1 stimulation of bone  resorption by rat
osteoclasts. J Exp Med 164: 104-112, 1986 
10. Lee,TH., Fevold,KL.,  Muguruma,Y.,
Lottsfeldt,JL.,  Lee,MY. Relative roles of osteoclast  colony-stimulating factor
and   macrophage   colony-stimulating,   factor  in  the  course  of  osteoclast
development. Exp Hematol 22:66-73. 1994 
11. de-la-Mata,J., et al., Interleukin-6
enhances   hypercalcemia   and   bone   resorption   mediated   by   parathyroid
hormone-related protein in vivo. J.Clin Invest. 95:2846-2852, 1995 
12. KodamaH., et al., Congenital  osteoclast deficiency in osteopetrotic 
(op/op) mice is cured by  injections  of  macrophage  colony-stimulating  
factor.  J. Exp.  Med.  173:269-272,  1991 
13. Jilka,R.,  et al.,  Increased  osteoclast  development  after
estrogen  loss:  mediation  by  interleukin-6.   Science  257:88-91,   1992  
14.Horowits,MC.  Cytokines and estrogen in bone: Anti-osteoporotic effects. 
Science 260:626-627,  1993 
15. Rifkin,DB and Moscatelli,  D. Recent  developments in the
cell biology of basic fibroblast  growth factor.  J.Cell Biol 109: 1-6, 1989 
16.Apone,S.,  Fevold,K.,  Lee,M., Eyre,D. A rapid method for quantifying 
osteoclastactivity in vitro.  J Bone Min Res 9:S178,  1994 
17.  Muguruma,Y.  and Lee,  MY.Osteoclast   progenitors  express  c-Kit,  but  
their  differentiation   appears independent of SCF. (submitted) 15

<PAGE>

FOUR EXPRESSION GRAPHS REDACTED ON THIS PAGE



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