CAMBRIDGE BIOTECH CORP
10-Q, 1996-08-12
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                      SECURITIES AND EXCHANGE COMMISSION                      
                           Washington, D.C. 20549
                                 FORM 10-Q

(Mark One)
[ X ]   Quarterly report pursuant to Section 13 or 15(d) of the Securities
        Exchange Act of 1934.  
        For the quarterly period ended June 30, 1996 or

[   ]   Transition report pursuant to Section 13 or 15(d) of the Securities
        Exchange Act of 1934 
        For the transition period from ______ to ______

Commission File Number 0-12081

                       CAMBRIDGE BIOTECH CORPORATION
           (Exact Name of Registrant as Specified in Its Charter)

          Delaware                                04-2726626
(State or Other Jurisdiction of      (I.R.S. Employer Identification No.)
 Incorporation or Organization)

                 365 Plantation Street, Worcester, MA  01605
             (Address of Principal Executive Offices) (Zip Code)

                           (508) 797-5777
             (Registrant's Telephone Number, Including Area Code)
- ----------------------------------------------------------------------------
(Former Name, Former Address and Former Fiscal Year, If Changed Since Last
                               Report)

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

                   APPLICABLE ONLY TO ISSUERS INVOLVED IN 
                     BANKRUPTCY PROCEEDINGS DURING THE
                           PRECEDING FIVE YEARS
    
    Indicate by check mark whether the registrant has filed all documents
and reports required to be filed by Sections 12, 13 or 15(d) of the Securities
Exchange Act of 1934 subsequent to the distribution of securities under a
plan confirmed by a court.
Yes_____ No______

                   APPLICABLE ONLY TO CORPORATE ISSUERS:
    Indicate the number of shares outstanding of each of the issuer's classes
of common stock, as of the latest practicable date.

As of July 31, 1996
Common Stock Outstanding 26,065,017
                      
- ------------------------------------------------------------------------------ 
                     CAMBRIDGE BIOTECH CORPORATION
                         Form 10-Q June 30, 1996
                                  INDEX

PART I - FINANCIAL INFORMATION
                           
Item 1.  Unaudited, Consolidated Financial Statements        Page Number

         Consolidated Balance Sheets as of June 30, 1996 
         and December 31, 1995                                    

         Consolidated Statement of Operations for three 
         and six month periods ended June 30, 1996 and 1995                    

         Consolidated Statement of Cash Flows for six month 
         periods ended June 30, 1996 and 1995                        

         Notes to Consolidated Interim Financial Statements         

Item 2.  Management's Discussion and Analysis of Financial 
         Condition and Results of Operations

PART II - OTHER INFORMATION

Item 1.  Legal Proceedings 

Item 4.  Submission of Matters to a Vote of Security Holders

Item 6.  Exhibits and Reports on Form 8-K                        

SIGNATURES                                                       
- -----------------------------------------------------------------------------
Item 1.  Consolidated Financial Statements

                       CAMBRIDGE BIOTECH CORPORATION
                          (Debtor-In-Possession)
                        Consolidated Balance Sheets
                               (Unaudited)
                              (In Thousands)

Assets                               6/30/96       12/31/95       
                                     --------      --------
Current Assets:
  Cash and cash equivalents          $13,876       $ 6,856
  Restricted Cash                      1,000             0
  Marketable Securities                    0           216
  Accounts receivable                                                 
   -trade (net of allowance
    for doubtful accounts)             2,828         2,638
  Other receivables                      131           126
  Inventories                          4,856         4,368
  Prepaid expenses & other
    current assets                       455           695
                                      ------        ------
  Total Current Assets                23,146        14,899

Investments                              300             0

Property, plant, and equipment, 
  net                                  5,613         6,986
Patents and purchased 
  technology, net                        503         1,055
Other assets                             105           105
                                      ------        ------
Total Assets                        $ 29,667       $23,045
                                     =======       ======= 
Liabilities & Shareholders' 
Equity
Current Liabilities:
   Accounts payable                 $    626           851
   Accrued royalties                     776         1,192
   Accrued professional fees           1,142           753
   Accrued incentive 
     compensation                      1,226         1,458
   Accrued restructuring costs           211           257
   Other accrued expenses              2,791         2,001
   Deferred revenue-current            3,156           411
                                      ------         -----
    Total Current Liabilities          9,928         6,923
                                   
   Deferred revenue-long term          1,879         2,287
                                                                
   Liabilities subject to                   
    Chapter 11 proceedings             9,886         9,880
                                      ------         -----
    Total Liabilities                 21,693        19,090

    Minority Interest                     10             9
    
    Shareholders'Equity
       Preferred Stock, par value
       $.01 per share authorized,
       5,000,000 shares, none issued       0             0
      Common stock, par value 
       $.01 per share authorized, 
       40,000,000 shares, issued                                         
       26,065,017 shares                 261           261
      Additional paid in 
        capital                      120,382       120,382
      Unearned compensation             (138)         (138)
      Deficit                       (112,541)     (116,559)
                                     -------       -------
    Total Shareholders'Equity          7,964         3,946
                                     -------         -----
    Total Liabilities and 
      Shareholder's Equity           $29,667       $23,045
                                     =======       ========
The accompanying notes are an integral part of these unaudited consolidated
financial statements.               
- -----------------------------------------------------------------------------
                         Cambridge Biotech Corporation
                            (Debtor-In-Possession)
                      Consolidated Statement of Operations
                                 (Unaudited)
                    (In Thousands, except per share amount)     

                                Three Months Ended        Six Months Ended 
                                     June 30,                 June 30,
                                1996         1995         1996        1995     
Revenue:                        ----         ----         ----        ----     
Product sales                $3,900       $ 4,056      $ 8,306    $ 7,114
 Research & development        1,310         1,142        2,657      2,350
 Royalties                       454           478          905        908
                               -----         -----        -----      -----
                               5,664         5,676       11,868     10,372
Cost and expenses:
 Cost of sales                 2,985         3,290        6,183      6,721
 Research & development        1,423         1,270        2,715      2,868
 Sales, general &                                         
   administrative              1,917         2,340        3,822      4,613
                               -----         -----        -----      -----
                               6,325         6,900       12,720     14,202
Other:
 Other income and interest 
   expense net of interest 
   income                        103           119          197        188
                               -----        ------        -----      -----
Loss from continuing 
   operations before 
   reorganization items 
   and income tax expense       (558)       (1,105)        (655)    (3,642)

Reorganization items:
 Professional fees              (454)         (336)        (710)      (609)
 Interest earned on 
   accumulated cash
   resulting from Chapter
   11 proceedings                117           100          230        208
                                -----         -----       -----       -----
Total reorganization items      (337)         (236)        (480)      (401)  
                                -----         -----       -----       -----
 Loss from continuing     
 operations before income 
 tax expense                    (895)       (1,341)      (1,135)    (4,043)

Income tax expense               ---            (1)          (2)        (2)
                                -----         -----        -----     -----
Loss before                     (895)       (1,342)      (1,137)    (4,045)
minority interest                                    

Minority Interest                 (1)            0           (2)        (2)
                                -----         -----        -----     -----
Loss from continuing                                   
operations                     ($896)      ($1,342)     ($1,139)   ($4,047)
                               
Discontinued operations: 
  Income from discontinued
   operations                    214           109          620        109
  Gain from disposal           4,537             0        4,537          0
                               -----        ------        -----       -----
Net income/(Loss)             $3,855       ($1,233)      $4,018    ($3,938)
                              ======       ========      ======      ======
Net Income/(Loss) per 
 weighted average number of 
 common shares:            
     Continuing operations    ($0.03)       ($0.05)      ($0.05)    ($0.15)
     Discontinued operations   $0.18         $0.00        $0.20      $0.00
                               ------       -------      -------   -------
Net Income/(Loss) per share    $0.15        ($0.05)       $0.15     ($0.15)
                               =====        =======       =====     =======
Weighted average number of
   common shares outstanding   26,065       26,065       26,065     26,065
                               ======       ======       ======     ======      
The accompanying notes are an integral part of these unaudited consolidated 
financial statements.             
- -----------------------------------------------------------------------------
                        Cambridge Biotech Corporation
                           (Debtor-In-Possession)
                     Consolidated Statement of Cash Flows
               For the six months ended June 30, 1996 and 1995
                                 (Unaudited) 
                               (In Thousands)                       
                               
                                             1996      1995                    
                                             ----      ----
Cash Flows From Operating 
 Activities:
  Net Income/(Loss)                         $4,018   ($3,938)         
  Adjustments to reconcile net income/ 
   (Loss) to net cash provided/(used) 
   by operating activities:    
  Depreciation and 
   amortization                              2,085     2,478              
  Provision for doubtful accounts               30        23
  Non-cash compensation expense                ---        49              
  Gain on sale of enterics 
   business                                 (4,496)      ---
  Loss on sale of
   marketable securities                       ---         1
  Changes in assets and 
   liabilities:
  Restricted cash                           (1,000)      ---
  Accounts and other
   receivables                                (226)     (521)    
  Inventories                                 (488)       85         
  Prepaid and other 
   current assets                              241      (399)                 
  Investments                                 (300)      ---   
  Accounts payable and 
   other accrued expenses                      314     2,310              
  Deferred revenue                           2,336    (2,035)  
  Accrued restructuring                                     
   charges                                     (46)      (12)              
  Other noncurrent assets and
   liabilities                                   1        (1)
  Minority interest                              1         5
  Net cash provided/(used) by                 ------    ------
   operating activities                      2,471    (1,955)         

  Cash Flows From Investing 
    Activities:
    Proceeds from sale of
     marketable securities                     216         0           
    Purchases of property,                                                  
     plant, and equipment                     (152)     (311)            
    Patents & purchased 
     technology                               (114)     (152)           
  Proceeds from sale of
    enterics business                        4,601       ---
                                             ------    ------
  Net cash provided (used) 
    by investing activities                  4,551      (463)               

  Cash Flows from Financing
    Activities:
       Payment on long-term 
         obligations                            (2)       (2)           
                                             -------   ------
      Net cash used by 
      financing activities                      (2)       (2)           
                                             -------   ------
 Net increase(decrease) in cash
  and cash equivalents                       7,020    (2,423)                 

 Cash and cash equivalents at
  the beginning of the year                  6,856     8,538                 
                                             -----     ------
 Cash and cash equivalents at
  the end of the period                    $13,876    $6,115               
                                            ======     =====
Supplemental disclosures:                        
Income taxes paid/refunded                      $7    $    0           
                                            ======     =====
      
The accompanying notes are an integral part of these unaudited consolidated
financial statements.            
- -----------------------------------------------------------------------------
                      CAMBRIDGE BIOTECH CORPORATION
       NOTES TO UNAUDITED, CONSOLIDATED INTERIM FINANCIAL STATEMENTS

1.  Basis of Presentation:
    
    The accompanying consolidated interim financial statements are unaudited 
    and have been prepared on a basis substantially consistent with the 
    audited financial statements and based on considering the sale of the  
    enterics business as a discontinued operation as discussed in Footnote 3.  
    Certain information and footnote disclosures normally included in the 
    Company's annual financial statements have been condensed or omitted 
    pursuant to the Securities and Exchange Commission's rules and 
    regulations.  The consolidated interim financial statements, in the 
    opinion of management, reflect all adjustments (including normal 
    recurring accruals) necessary for a fair presentation of the results 
    for the interim periods.

    The results of operations for the interim periods are not necessarily
    indicative of the results of operations to be expected for the fiscal
    year.  These consolidated interim financial statements should be read
    in conjunction with the audited financial statements for the year ended
    December 31, 1995, which are contained in the CBC's Annual Report
    on Form 10-K for the year ended December 31, 1995, filed with the 
    Securities and Exchange Commission.

2.  Inventories:

    Inventories consist of the following:           (000'S)

                                             6/30/96      12/31/95
                                             -------      --------
    Finished goods                            $1,082       $   681
    Work in process                            2,888         2,887
    Raw materials & supplies                     886           800
                                             -------       ------- 
                                              $4,856       $ 4,368
                                             =======       =======
- ----------------------------------------------------------------------------
3.  Discontinued Operations:              

On June 24, 1996, CBC sold the assets of its enterics diagnostic business 
pursuant to an Asset Purchase Agreement ("Purchase Agreement") to Meridian
Diagnostics, Inc. ("Meridian") for approximately $5,700,000 in cash.  
Meridian also agreed to pay to CBC appoximately $650,000 for certain 
inventory purchased at closing and a "royalty" on annual sales in excess of
certain threshold amounts for a five year period.  CBC has also entered into
a Supply Agreement to supply Meridian with certain quantities of product
over a period not to exceed six months from closing.  Under the Purchase
Agreement, $1,000,000 of the purchase price is being held in escrow to be
released after consummation of CBC's bankruptcy reorganization plan (or
alternatively upon the expiration of certain representations and warranties)
as product is delivered under the Supply Agreement.  The results from 
operations and gain on disposal of the enterics business are reported as 
discontinued operations and the prior periods have been restated to reflect 
that occurrence.  The income from the discontinued operation for the three 
and six months ended June 30, 1996 was $214,000 and $620,000, respectively, 
compared to $109,000 and $109,000 for the same period in 1995.  A gain on 
disposal of approximately $4,539,000 was recorded.  

4.  Subsequent Events:

On July 18, 1996 CBC's Plan of Reorganization was confirmed by order of 
the U.S. Bankruptcy Court.  The major transactions contemplated by the Plan 
are:  (i) CBC's sale of the assets of the enterics business; (ii) the 
issuance by Aquila on the consummation date under the Plan of 5,000,000 
shares of Aquila common stock (together with a right to purchase a "Unit" as 
described below) to CBC equity security holders and certain CBC creditors 
in exchange for their interests in and claims against CBC, and the payment of 
other creditors in cash; (iii) the distribution of the assets of the biopharm 
business to Aquila on the consummation date under the Plan; (iv) Aquila's 
sale of all of the issued and outstanding stock of CBC to bioMerieux pursuant 
to the Master Acquisition Agreement for $6.5 million in cash; and (v) a 
rights offering (the "Rights Offering") pursuant to which the holder of each 
share of Aquila common stock distributed pursuant to the Plan on account of 
an allowed claim or interest would be entitled to purchase a "Unit" entitling 
the purchaser to one share of Aquila common stock and a warrant to purchase 
one share of Aquila common stock.  Each participant in the Rights Offering 
would also obtain certain rights with respect to unsubscribed Units.  See 
Current Report on Form 8-K dated July 18, 1996 and Exhibit 2 thereof, for a 
description of the Plan.

The United States Bankruptcy Appellate Panel for the First Circuit entered 
an order on July 29, 1996 imposing a temporary twenty-one day stay of the 
Bankruptcy Court order confirming the Plan.  The stay was requested by 
Institut Pasteur and Pasteur Sanofi Diagnostics who are appealing the 
Bankruptcy Court's confirmation of CBC's reorganization plan over their 
objection to the assumption of various patent licenses covering patents
owned by Institut Pasteur and licensed to CBC.

On July 12, 1996 CBC entered into an agreement with Abbott Laboratories
("Abbott") that revised the terms for payment of amounts due from
Abbott to CBC under a sublicense agreement dated December 2, 1988.  Under 
the terms of the July 12 agreement, Abbott will pay CBC $5,000,000 in 
exchange for a fully paid-up sublicense for the non-exclusive diagnostic 
use of certain technology licensed exclusively to CBC by Harvard University
("Harvard").  Harvard will receive from CBC $1,750,000 of the Abbott
payment.  CBC will retain $650,000 of the Abbott payment and the remaining
$2,600,000 will be transferred to Aquila upon consummation of the Plan (or
within three business days of receipt of the payment by CBC if the payment
is received after consummation).
- -----------------------------------------------------------------------------
Item 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND 
         RESULTS OF OPERATIONS
General                                
- -------                                                                      
CBC filed for protection under Chapter 11 of the United States Bankruptcy
Code ("Chapter 11") on July 7, 1994, pursuant to a voluntary petition filed
in the United States ("Bankruptcy Court") for the District of Massachusetts,
Western Division Bankruptcy Court.  CBC has managed its assets and operated 
its businesses as a debtor in possession throughout the Chapter 11 process.

As part of the reorganization process, management reviewed CBC's strategic
direction, including specific products and programs, and identified certain
assets and operations which did not fit within the business plan for re-
organizing CBC.   

As of April 4, 1996, CBC, bioMerieux Vitek, Inc. ("bioMerieux") and Aquila
Biopharmaceuticals, Inc. ("Aquila") entered into a Master Acquisition 
Agreement.  Under the Master Acquisition Agreement, pursuant to the reorgan-
ization plan, CBC would become a wholly owned subsidiary of Aquila with the
shareholders of CBC exchanging all of their shares in CBC for Aquila shares.
CBC would continue its diagnostic business and retain the following as each
pertains to the diagnostic business: machinery, equipment, inventory, 
employees located in Rockville, Maryland, permits, licenses, patents, 
trademarks and other intellectual property pertaining to the diagnostic
business.  The assets pertaining to CBC's biopharmaceutical business and 
CBC's real estate interests would be transferred to Aquila, and the stock of 
CBC (the owner of the diagnostic business) would be sold by Aquila to 
bioMerieux for $6.5 million dollars in cash.  In addition, bioMerieux would 
lease the diagnostic manufacturing facilities in Rockville, Maryland from 
Aquila.  The biopharmaceutical business, which consists of the development 
and commercialization of products which stimulate the immune system to treat 
infectious diseases and cancer, would be continued by Aquila.

On April 10, 1996, CBC filed a disclosure statement and Reorganization Plan.
After a hearing, the disclosure statement was approved in an amended form
by the Bankruptcy Court on May 17, 1996, and was distributed to CBC's 
creditors, shareholders, and other interested parties. 

On May 6, 1996, CBC entered into an agreement for the sale of the assets of 
CBC's enterics diagnostic business, including four tests for intestinal 
pathogens and a diagnostic test for Lyme disease, for $4.5 million in cash.  
On May 16, 1996 the Bankruptcy Court approved the sale of the enterics 
business and a bidding process by which other parties could submit bids for 
the enterics business.  On June 19, 1996, the Bankruptcy Court approved the 
sale of the enterics business to the successful bidder Meridian for 
$5,700,000 and certain other considerations including inventory purchases 
of $650,000 and a supply agreement.  Meridian will also pay a royalty over a 
five year period based upon net sales in excess of certain threshold amounts.  
Under the Purchase Agreement, $1,000,000 of the purchase price is being held 
in escrow to be released after consummation of CBC's bankruptcy reorganization 
plan (or alternatively upon the expiration of certain representations and 
warranties) as product is delivered under the Supply Agreement.  The sale to 
Meridian closed on June 24, 1996.

On July 15, 1996, a confirmation hearing on the proposed Reorganization Plan 
was conducted, and the Plan was subsequently confirmed by order of the 
Bankruptcy Court on July 18, 1996 (as confirmed, the "Plan").  The major
transactions contemplated by the Plan are:  (i) CBC's sale of the assets of
the enterics business; (ii) the issuance by Aquila on the consummation date
under the Plan of 5,000,000 shares of Aquila common stock (together with a
right to purchase a "Unit" as described below) to CBC equity security holders
and certain CBC creditors in exchange for their interests in and claims 
against CBC, and the payment of other creditors in cash; (iii) the dist-
ribution of the assets of the biopharmaceutical business to Aquila on the 
consummation date under the Plan; (iv) Aquila's sale of all of the issued 
and outstanding stock of CBC to bioMerieux pursuant to the Master Acquisition 
Agreement for $6.5 million in cash; and (v) a rights offering (the "Rights 
Offering") pursuant to which the holder of each share of Aquila common stock 
distributed pursuant to the Plan on account of an allowed claim or interest 
would be entitled to purchase a "Unit" entitling the purchaser to one share 
of Aquila common stock and a warrant to purchase one share of Aquila common 
stock.  Each participant in the Rights Offering would also obtain certain 
rights with respect to unsubscribed Units.  See Current Report on Form 8-K 
dated July 18, 1996 and Exhibit 2 thereof, for a description of the Plan.

On July 29, 1996, the Bankruptcy Appellate Panel for the First Circuit 
imposed a temporary twenty-one day stay of the Bankruptcy Court's 
confirmation order.  The transactions described in the preceeding paragraph 
cannot be executed and the Plan cannot be consummated while the stay remains 
in effect.

Results of Operations
- ---------------------
The Consolidated Statement of Operations presents CBC's results from
operations exclusive of the enterics diagnostic business, which is presented
as a Discontinued Operation in the statement.  Revenues, costs, 
expenses, and other items reflect the results of CBC's retroviral and 
biopharmaceutical businesses and administrative functions, as more fully 
described below.

Three and Six Months Ended June 30, 1996 and 1995  

Revenues were $5,664,000 for the three months ended June 30, 1996 compared 
to $5,676,000 in the same period in 1995.  Revenues for the six months ended 
June 30, 1996 were $11,868,000 compared to $10,372,000 in the same period 
in 1995.

Product sales decreased to $3,900,000 in the second quarter of 1996 from
$4,056,000 for the same period in 1995, a decrease of approximately 2%.  
Product sales for the first six months of 1996 increased to $8,306,000 from 
$7,114,000 for the same period in 1995.  The increase is primarily 
attributable to the sales of both diagnostic and biopharmaceutical antigen 
products during the first quarter of 1996.

Research and Development ("R&D") revenues were $1,310,000 in the second
quarter of 1996 compared to $1,142,000 for the same period in 1995.   
R&D revenue for the first six months of 1996 increased to $2,657,000 from 
$2,350,000 for the same period in 1995.  The increases in both periods 
compared to the same periods in the prior year are attributable to increased 
R&D activities.

Royalty revenue was virtually unchanged at $454,000 in the second quarter of 
1996 compared to $478,000 for the same period in 1995, and at $905,000 for 
the first six months of 1996 compared to $908,000 for the same period in 
1995.

Cost of products sold as a percentage of product sales was 77% for the 
three months ended June 30, 1996 compared to 81% for the same period
in 1995.  For the six months ended June 30, 1996 and 1995, the cost of 
products sold as a percentage of product sales was 74% and 94%, respect-
ively.  Profit margins improved during 1996 because of the growth in antigen
sales, which have margins that are favorable to other products sold by CBC
and because production difficulties in 1995 resulted in significantly 
greater costs.

Research and development expenses increased to $1,423,000 in the second
quarter of 1996 from $1,270,000 for the same period in 1995.  For the first
six months of 1996 compared to the same period in 1995, research and devel-
opment expenses were $2,715,000 and $2,868,000, respectively. The increase 
is due to a general increase in activity across a variety of research and
development projects.  The decrease over the entire period is primarily due 
to the accrual of expenses related to CBC's employee stock incentive plan for 
R&D employees that occurred in 1995.

Selling, general and administrative expenses decreased to $1,917,000 in the 
second quarter of 1996 from $2,340,000 for the same period in 1995.  For the 
first six months of 1996, selling, general and administrative expenses 
decreased to $3,822,000 from $4,613,000 for the same period in 1995.
The decrease is primarily due to the accrual of expenses related to CBC's 
employee stock incentive plan for administrative employees that occurred in
1995 and decreased personnel expenses in 1996.

Chapter 11 related professional fees and interest earned on accumulated 
cash were $454,000 and $117,000, respectively for the three months ended 
June 30, 1996, compared to $336,000 and $100,000 for the same period in 1995. 
For the first six months of 1996 compared to the same period in 1995, Chapter 
11 related professional fees and interest earned on accumulated cash were 
$710,000 and $230,000 compared to $609,000 and $207,000, respectively.
                                                                          
The Company lost $896,000 or ($0.03) per share from continuing operations and 
had net income of $3,855,000 or $0.15 per share in the second quarter of 
1996 including the income and gain from disposal from discontinued 
operations, as compared to a loss of $1,342,000 or ($0.05) per share from 
continuing operations and a net loss of $1,233,300 or ($0.05) per share 
including the income from discontinued operations for the same period in 1995.  
For the first six months of the year, CBC lost $1,139,000 or ($0.05) per 
share from continuing operations and had net income of $4,018,000 or $0.15 
per share including the income and gain from disposal from discontinued 
operations, compared to a loss of $4,047,000 or ($0.15) per share including
the income from continuing operations and a net loss of $3,937,900 or 
($0.15) per share including the income from discontinued operations for the 
same period in 1995.
- -----------------------------------------------------------------------------
Liquidity and Capital Resources
- -------------------------------
Timely consummation of the Plan is crucial in order for CBC to successfully
emerge from bankruptcy and for Aquila to implement its plan for the 
continuing development of the biopharmaceutical business.  The stay of the 
confirmation order, preventing the immediate consummation of the Plan, 
seriously jeopardizes the ability of CBC to complete its plan of reorgani-
zation, including completion of the Rights Offering by Aquila, which was
anticipated to provide a source of funds for the ongoing development of 
Aquila's technology.  CBC has filed a request with the District Court to
vacate the stay and also filed requests to require the posting of a
substantial bond by Institut Pasteur and Pasteur Sanofi Diagnostics if the
stay is to remain in effect.  Although CBC believes that the stay was
improvidently granted and that the Bankruptcy's Court's confirmation order
should be upheld, there can be no assurance that the stay will be lifted
or that the Court will order a bond to secure CBC against any damages 
incurred as a result of the stay or that CBC will prevail on the merits of
the case.  Even if the stay is lifted, there is no assurance that the passage
of time will not have jeopardized the successful completion of some of the
transactions contemplated in the Plan.

The ability of Aquila to fund its long term operations beyond 1996 after 
consummation of the Plan is dependent upon several factors, including the 
success of the Rights Offering and Aquila's ability to attract funding 
through additional public or private financing or by establishing corporate 
partnerships and collaborative arrangements.  There can be no assurance that 
such additional funding can be obtained on acceptable terms.

CBC's discussions as to management's plans and objectives for CBC's business
after the date hereof including those with respect to the consummation of
the Plan and operations of Aquila are forward looking statements.  Actual
results may differ from those projected by CBC as a result of court actions,
the effect of economic conditions, risks in product and technology develop-
ment and other risks identified in CBC's Securities and Exchange Commission
filings and the exhibits thereto.

Cash and cash equivalents were $13,876,000 at June 30, 1996 compared to 
$6,855,800 at December 31, 1995, with the increase resulting primarily from 
the sale of the enterics business and receipt of a license payment from a 
large pharmaceutical partner.

The net cash provided by operating activities was $2,467,100 for the six 
months ended June 30, 1996 as compared to net cash used in operating 
activity of $1,957,600 for the same period in 1995.  The primary items 
included in net income or loss that are not operating sources or uses of
cash were depreciation and amortization of $2,084,800 and $2,478,200 for 
six months ended June 30, 1996 and 1995, respectively and the $4,500,000 gain
from the sale of the enterics business.  The increase in deferred revenue in 
the first half of 1996 is primarily the result of the receipt of an annual 
license payment from a large pharmaceutical partner which is recognized as 
earned and the $1,000,000 in deferred revenue from the escrowed portion of 
the enterics purchase price.  Accounts payable and accrued expenses increased 
in 1995 due to patent related milestone obligations, employee retention 
bonuses, and timing of expenditures.
 
CBC's investing activities provided cash of $4,551,000 for the six months 
ended June 30, 1996, compared to using cash of $463,000 for the same period 
in 1995.  The sale of the enterics business and of certain marketable 
securities were the primary reasons for the increase in cash provided by 
investing activities.

CBC had total working capital of $13,218,900 and current ratio of 2.33 to 
1 at June 30, 1996, compared to $7,976,600 and 2.15 to 1 at 
December 31, 1995.  However, CBC had approximately $9,886,000 in liabilities 
subject to Chapter 11 proceedings as of June 30, 1996 and if all of these 
liabilities were considered current liabilities, the current ratio would have 
been 1.17 to 1 at June 30, 1996, compared to 0.89 to 1 at December 31, 1995.

- ----------------------------------------------------------------------------
PART II.  OTHER INFORMATION

Item 1.  LEGAL PROCEEDINGS

As reported above see (Part 1 Item 2) CBC's plan of reorganization was 
confirmed by order of the U.S. Bankruptcy Court on July 18, 1996.  See
Current Report on Form 8 and Exhibit 2 thereto, dated July 18, 1996, for a 
description of the Plan.  On July 29, 1996, the Bankruptcy Appellate Panel 
for the First Circuit imposed a temporary twenty-one day stay of the 
Bankruptcy Court's Confirmation order.  The settlement agreement with 
MicroGeneSys, Inc. reported in CBC's Annual Report for 1995 on Form 10-K
has been approved by the Bankruptcy Court and the United States District
Court for the District of Connecticut.

Item 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

Pursuant to Section 1125 of the Bankruptcy Code, on June 5, 1996, CBC mailed
a Disclosure Statement and soliciting materials to all members of classes of
Claims or Interests impaired under the Plan (including the holders of CBC 
Common Stock), seeking approval as required by the Bankruptcy Code.  Claimants 
and Interest holders had until 4:00 p.m. Eastern Time on July 8, 1996 to vote.  
The holders of Class 6 Interests (the CBC Common Stock) voted 10,312,697 
shares in favor and 714,171 shares against approval of the Plan.
- -----------------------------------------------------------------------------
Item 6.  Exhibits and Reports on Form 8-K

(a) Exhibits
    --------

    2.  Confirmed Reorganization Plan (consisting of Reorganization Plan 
        dated May 20, 1996, and Modification dated July 15, 1996) (incor-
        porated by reference to Exhibit 2 to Current Report on Form 8-K
        dated July 18, 1996, File No. 0-12081).

  10.1  Master Acquisition Agreement by and among bioMerieux Vitex, Inc.
        Aquila Biopharmaceuticals, Inc. and Cambridge Biotech Corporation
        dated as of April 4, 1996.

  10.2  Asset Purchase Agreement between Meridian Diagnostics, Inc. and
        Cambridge Biotech Corporation dated as of June 24, 1996 (incorporated
        by reference to Exhibit 2.1 to Current Report on Form 8-K, dated
        June 24, 1996, File No. 01-12081).

   27.  Financial Data Schedule

- -----------------------------------------------------------------------------
(b)  Reports on Form 8-K

      During the quarter ended June 30, 1996, CBC filed the following 
      reports on Form 8-K:

      1.  Current Report on Form 8-K dated 04/17/96

      2.  Current Report on Form 8-K dated 05/13/96 

      3.  Current Report on Form 8-K dated 06/24/96

      4.  Current Report on Form 8-K dated 07/18/96 



































































     
                              SIGNATURES

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

                        CAMBRIDGE BIOTECH CORPORATION


Date:  August   9, 1996
                                /s/ Alison Taunton-Rigby
                                ------------------------------------------
                                Alison Taunton-Rigby
                                President and Chief Executive Officer

                                /s/ Stephen J. DiPalma
                                ------------------------------------------
                                Stephen J. DiPalma
                                Chief Financial Officer, Vice President of
                                Finance and Treasurer
























































                                     


















                  MASTER ACQUISITION AGREEMENT dated as of April 4, 1996
             (this "Agreement"), by and among BIOMERIEUX VITEK, INC., a
             Missouri corporation (the "Purchaser"), AQUILA
             BIOPHARMACEUTICALS, INC., a Delaware corporation (the
             "Seller"), and CAMBRIDGE BIOTECH CORPORATION, a Delaware
             corporation and Debtor-in-Possession in the Bankruptcy Case
             (as defined below) ("CBC").


                                  R E C I T A L S

                  WHEREAS pursuant to a voluntary petition filed on July
        7, 1994 in the United States Bankruptcy Court for the District of
        Massachusetts, Western Division (the "Bankruptcy Court"), Case
        Number 94-43054-JFQ (the "Bankruptcy Case"), CBC sought protection
        under Chapter 11 of the United States Bankruptcy Code (the
        "Bankruptcy Code");

                  WHEREAS the Purchaser and CBC have agreed to structure a
        transaction pursuant to which the Purchaser would acquire all the
        outstanding shares of capital stock of CBC from and after its
        reorganization pursuant to the Bankruptcy Code in a transaction to
        be described in and consummated pursuant to a plan of
        reorganization to be submitted to the Bankruptcy Court for its
        approval (the "Plan of Reorganization");

                  WHEREAS the Parties intend that such acquisition of
        capital stock would occur subsequent to the occurrence of certain
        other transactions described below to be approved by the
        Bankruptcy Court as elements of the Plan of Reorganization;

                  WHEREAS it is contemplated that, prior to the Closing
        hereunder (as hereinafter defined), the Seller will be the
        beneficial and record owner of all the issued and outstanding
        capital stock of CBC;

                  WHEREAS the Seller wishes to provide for the sale to the
        Purchaser and the Purchaser wishes to provide for the purchase
        from the Seller of all such capital stock upon the terms and
        subject to the conditions set forth in this Agreement;

                  NOW, THEREFORE, in contemplation of the foregoing and in
        consideration of the mutual agreements, covenants, representations
        and warranties contained herein and intending to be legally bound
        hereby, the parties hereto agree as follows:<PAGE>




                                     ARTICLE I

                               EXPENSE REIMBURSEMENT
                             ALTERNATIVE TRANSACTIONS
                              PLAN OF REORGANIZATION

                  SECTION 1.1.  Expense Reimbursement; Alternative
        Transaction Fee; Bidding Procedure.  (a) CBC shall promptly file
        an appropriate and required notice and motion seeking an order of
        the Bankruptcy Court (the "Definitive Authorization") (i)
        approving the adoption of the no solicitation provision described
        in paragraph 5 of Annex A hereto, (ii) recognizing and approving
        the expense reimbursement fee (the "Expense Reimbursement Fee")
        and the alternative transaction fees (the "Alternative Transaction
        Fees") described on Annex A hereto as "administrative expenses"
        pursuant to 11 U.S.C. Section 503(b), and (iii) adopting the
        bidding procedure (the "Bidding Procedure") set forth on Annex A
        hereto as the only means by which CBC can consider an alternative
        transaction to the transaction proposed to be consummated
        hereunder (the existence of a procedure for the consideration of
        an alternative transaction not to be construed as calling for the
        entering into of an agreement or the consummation of such an
        alternative transaction hereunder.  CBC will also diligently seek
        a determination of the Bankruptcy Court that the Purchaser is an
        entity that will have purchased the Assets (as defined below) "in
        good faith" as such term is used in Section 363(m) of the
        Bankruptcy Code, if the Assets are indirectly acquired through the
        acquisition of stock as contemplated herein or the Purchaser
        should purchase the Assets under an alternative structure agreed
        to by the parties involving the direct purchase of the Assets.

                  (b)  CBC shall not nor shall it authorize or knowingly
        permit any officer, director, employee or representative retained
        by it to solicit or initiate the solicitation of any offer to
        purchase the Assets directly or through the acquisition of an
        equity interest in CBC.  It is understood and agreed that, subject
        to applicable confidentiality provisions, CBC may receive other
        bids for assets and/or equity of CBC; provided, however, that the
        Bidding Procedure set forth on Annex A hereto shall be adhered to
        with respect to any such bids.

                  SECTION 1.2.  Plan of Reorganization.  CBC and the
        Seller will use all reasonable efforts to formulate, promote and
        obtain Bankruptcy Court approval of a disclosure statement
        containing "adequate information" within the meaning of such term
        as used in Section 1125 of the Bankruptcy Code (the "Disclosure
        Statement") and acceptance of the Plan of Reorganization by
        holders of the requisite number and amount of interests and
        claims, such plan to encompass the transactions described in this
        Master Acquisition Agreement, including those described in this
        Article I, expressly to approve this Agreement and all the
        transactions contemplated hereby, and to provide for the
        assumption, assignment and rejection of executory contracts and
        unexpired leases under Section 365 of the Bankruptcy Code, and

                                       - 2 -<PAGE>




        other appropriate actions, as are consistent with and in
        furtherance of the transactions described herein. The Disclosure
        Statement and Plan of Reorganization as presented to the
        Bankruptcy Court and as the same may pertain to or have any
        material impact or effect upon the transaction contemplated
        hereunder shall be subject to the approval of the Purchaser as
        hereinafter provided, and the Purchaser shall cooperate with the
        Seller and CBC to support the Plan of Reorganization.  The Seller,
        CBC and the Purchaser may agree to restructure the transactions
        provided for herein in the form of an asset purchase in the event
        that effectiveness of the Plan were to be unreasonably delayed and
        restructuring of the transaction provided an alternative
        satisfactory to each, subject to Bankruptcy Court approval.

                  SECTION 1.3.  Transactions Contemplated by the Plan of
        Reorganization.  The Plan of Reorganization shall provide that
        (i) the Seller shall acquire all the outstanding shares of capital
        stock (the "Shares") of the reorganized entity ("Reorganized
        CBC"), (ii) the Seller shall sell such Shares of Reorganized CBC
        to the Purchaser in accordance with the terms of this Agreement,
        and (iii) the Seller and CBC shall cause distribution to the
        former shareholders and the claimholders of CBC of such
        consideration (consistent with the terms hereof) as will result in
        full and complete discharge, release and cancellation of claims
        against and all interests in CBC as it was constituted prior to
        the consummation of the Plan of Reorganization ("Old CBC").  Prior
        to the transfer of the Shares, CBC shall transfer all assets,
        agreements, liabilities and other items not to be expressly
        retained as set forth herein by Reorganized CBC to the Seller and
        Reorganized CBC shall retain all the contracts, licenses and
        personal property listed on Annex B hereto (the "Assets").
        Concurrently with the transfer of the Shares, the Seller shall
        lease to Reorganized CBC the premises described in the Lease
        Agreement and Option to Purchase attached hereto as Annex C (the
        "Lease Agreement").  The Plan of Reorganization shall provide that
        all tax obligations of CBC will either be assumed by the Seller or
        be satisfied out of the Consideration (as defined below) pursuant
        to a determination of the Bankruptcy Court in accordance with
        Section 505 of the Bankruptcy Code, a motion with respect to which
        will be made before the Bankruptcy Court substantially in the form
        attached hereto as Annex D (the "Section 505 Motion") and the
        Seller will remain responsible for any additional tax assessed
        upon CBC in accordance with Section 505(c) of the Bankruptcy Code.
        Except as otherwise provided herein, Reorganized CBC shall be
        responsible for the obligations of Reorganized CBC as set forth in
        Schedule 1.3 (the "Reorganized CBC Obligations"), and the Seller
        shall be responsible for all other obligations of CBC, including
        all obligations that were incurred or will arise from conduct or
        conditions created or occurring prior to the Closing hereunder,
        including all claims, whether or not reduced to judgment,
        liquidated, unliquidated, fixed, contingent, matured, unmatured,
        disputed, undisputed, legal, equitable, secured or unsecured, and
        including any such post-petition claims.  Reorganized CBC, as
        acquired by the Purchaser, shall own and possess the Assets, and

                                       - 3 -<PAGE>




        it and they shall be acquired by the Purchaser free and clear of
        all obligations, except those obligations expressly set forth
        herein, and all liens, claims, encumbrances and security interests
        which theretofore had attached to the Assets shall thereafter
        attach to the Consideration (as defined below), except as
        expressly provided herein.  All the Shares shall be acquired by
        the Purchaser free and clear of all liens, claims and encumbrances
        and rights and options of others.


                                    ARTICLE II

                              PURCHASE OF THE SHARES

                  SECTION 2.1.  Agreement To Purchase the Shares.  The
        Purchaser hereby agrees to purchase from the Seller, and the
        Seller hereby agrees to sell to the Purchaser, subject to the
        conditions set forth herein, the Shares, which shall represent all
        the outstanding shares of capital stock of Reorganized CBC, and
        which shall be free and clear of all liens, claims, pledges,
        charges, security interests, mortgages and restrictions and
        encumbrances of any nature whatsoever (individually and
        collectively, "Liens").

                  SECTION 2.2.  Consideration and Payment.  Subject to the
        terms and conditions of this Agreement, and in reliance upon the
        representations, warranties and agreements of the parties
        contained herein, the Purchaser, at the closing of the
        transactions hereunder (the "Closing"), will deliver to the
        Seller, by wire transfer to an account designated by the Seller,
        an amount equal to $6,500,000 (as such amount is adjusted pursuant
        to Section 2.6, the "Consideration"), less (i) $50,000, which is
        the amount of estimated liability for state taxes described in the
        Schedules pursuant to Section 3.19, which amount shall be used by
        Reorganized CBC to pay and discharge any state taxes payable by
        CBC in respect of periods prior to the Closing, any balance to be
        paid to the Seller within a reasonable time after CBC has
        determined such liabilities and (ii) the amount specified in the
        written agreement referred to in Section 7.1(t); provided,
        however, that such payment shall be subject to the post-closing
        adjustment provided in Section 2.6, below.

                  SECTION 2.3.  Deliveries by the Seller.  At the Closing,
        the Seller will deliver to the Purchaser a certificate or
        certificates issued in the name of such Seller, duly endorsed or
        accompanied by stock powers duly executed in blank, together with
        such other documents as the Purchaser may reasonably request to
        evidence the transfer to the Purchaser of good, valid and
        marketable title in and to all such Shares free of all Liens, and
        evidencing, to the Purchaser's satisfaction, the due and valid
        occurrence of the other transactions that were to occur pursuant
        to the Plan of Reorganization, including certified orders of the
        Bankruptcy Court, instruments of assumption and other instruments
        as the Seller and the Purchaser shall agree constitute reasonable

                                       - 4 -<PAGE>




        evidence of the transfers preliminary to the Closing hereunder.
        In addition, the Seller shall deliver to the Purchaser:

                  (a)  a long form good standing certificate of CBC issued
        by the State of Delaware;

                  (b)  Certificate of Incorporation of CBC certified by
        the State of Delaware and By-Laws of CBC certified by its
        Secretary;

                  (c)  a certificate; dated the Closing Date, executed by
        the Chief Executive Officer of the Seller and CBC, certifying
        that, to the best of her knowledge, the representations and
        warranties made by the Seller and CBC pursuant to this Agreement
        are true and correct in all material respects as of the Closing
        Date (except to the extent such representations and warranties
        speak as of an earlier date) as though made on and as of the
        Closing Date;  (d)  all books and records of CBC, including its
        corporate minute book, seal and stock ledger book, in the
        possession or control of CBC;

                  (e)  the opinion of Bowditch & Dewey, counsel for the
        Seller and CBC in the form set forth on Annex E-1 hereto and the
        opinion of Brown, Rudnick, Freed & Gesmer, bankruptcy counsel to
        CBC, in the form set forth on Annex E-2 hereto;

                  (f)  an opinion of Coopers & Lybrand, accountants for
        CBC, to the effect that the consummation of the transactions
        contemplated herein in accordance with the Plan of Reorganization
        will, provided the Purchaser makes an election under Section
        338(h)(10) of the Code (as hereinafter defined) as contemplated
        herein, cause the sale of the capital stock of CBC to be treated
        as a sale of assets;

                  (g)  the Lease Agreement (such Lease Agreement together
        with the software and mainframe agreement referred to in Section
        6.12(f) and the licenses and sublicense referred to in Section
        6.16 being referred to herein as the "Additional Agreements");

                  (h)  a detailed listing of the tangible and intangible
        Assets to be transferred, reflecting the net book value of such
        Assets as of the Closing Date (the "Closing Date Asset Schedule");

                  (i)  all other previously undelivered items required to
        be delivered by the Seller to the Purchaser at the Closing
        pursuant to this Agreement or otherwise required in connection
        herewith, including other reasonable and customary closing
        documents required by the Purchaser.

                  All proceedings to be taken by the Seller in connection
        with the consummation of the transactions contemplated hereby and
        all certificates, opinions, instruments and other documents
        required to effect the transactions contemplated hereby reasonably


                                       - 5 -<PAGE>




        requested by the Purchaser will be reasonably satisfactory in form
        and substance to the Purchaser.

                  SECTION 2.4.  Deliveries by the Purchaser.  At the
        Closing, the Purchaser will deliver to the Seller the following:

                  (a)  the Consideration to the Seller provided for in
        Section 2.2;

                  (b)  a long form good standing certificate of the
        Purchaser, issued by its jurisdiction of incorporation;

                  (c)  Certificate of Incorporation of the Purchaser
        certified by its jurisdiction of incorporation and By-Laws of the
        Purchaser certified by its Assistant Secretary;

                  (d)  a certificate, dated the Closing Date, executed by
        the President of the Purchaser, certifying that, to the best of
        his knowledge, the representations and warranties made by the
        Purchaser pursuant to this Agreement are true and correct in all
        material respects as of the Closing Date (except to the extent
        such representations and warranties speak as of an earlier date)
        as though made on and as of the Closing Date;

                  (e)  the opinion of Donovan Leisure Newton & Irvine in
        the form set forth on Annex F hereto;

                  (f)  the Lease Agreement;

                  (g)  all other previously undelivered items required to
        be delivered by the Purchaser to the Seller at the Closing
        pursuant to this Agreement or otherwise required in connection
        herewith, including other reasonable and customary closing
        documents required by the Seller.

                  All proceedings to be taken by the Purchaser in
        connection with the consummation of the transactions contemplated
        hereby and all certificates, opinions, instruments and other
        documents required to effect the transactions contemplated hereby
        reasonably requested by the Seller will be reasonably satisfactory
        in form and substance to the Seller.

                  SECTION 2.5.    The Closing.  The Closing for the sale
        of Shares shall take place at the offices of Donovan Leisure
        Newton & Irvine, 30 Rockefeller Plaza, New York, New York 10112 at
        a date and time to be agreed upon by the parties consistent with
        Section 9.1(b) hereof (the "Closing Date"), such date to be as
        soon as practicable after the confirmation of the Plan of
        Reorganization by the Bankruptcy Court and the fulfillment of the
        other conditions set forth herein.

                  SECTION 2.6.    Post-Closing Adjustment.  (a) In the
        event that the value of the inventory as determined in good faith
        by the Purchaser (in the manner provided below) within ten

                                       - 6 -<PAGE>




        business days from and after the Closing Date (the "Actual
        Inventory Value") shall be less than an amount (the "Minimum
        Inventory Value") equal to (A) the value of such inventory as
        reflected in the audited financial statements of CBC as at
        December 31, 1995, minus (B) $100,000, the Seller shall pay to the
        Purchaser, in accordance with paragraph (c) below, an amount equal
        to the difference between the Minimum Inventory Value and the
        Actual Inventory Value. (Determination of value for purposes of
        this section shall be in a manner consistent with that used by CBC
        in connection with its 1995 financial statements to the extent
        such manner was consistent with Generally Accepted Accounting
        Principles.)  Such amount shall be payable whether or not the
        Purchaser elected to waive the condition set forth in Section
        7.1(j), and shall, if paid, be deemed to constitute an adjustment
        to the Consideration.

                  (b)  In the event that the Purchaser discovers, within
        six months from and after the Closing Date, that any of the Assets
        listed in Schedule 3.10 (as such schedule is delivered on the date
        hereof and without regard to any modification thereof pursuant to
        Section 5.2(d)), or reflected on the Closing Date General Ledger,
        did not constitute, at the time of the Closing, a part of the
        assets in the physical possession of CBC, then, as the Purchaser
        may direct, the Seller shall deliver at Seller's expense any
        missing asset if such delivery is practicable or the Seller shall
        pay to the Purchaser an amount equal to the net book value of such
        assets reflected on such Schedule 3.10, in accordance with
        paragraph (c) below.  The payment of any amount pursuant to this
        paragraph shall be deemed to constitute an adjustment to the
        Consideration.  Notwithstanding the above no adjustment shall be
        payable under this section unless the aggregate net book value of
        all such assets not in the physical possession of CBC exceeded
        $15,000, but in such case Seller shall act in good faith to turn
        over to CBC any such missing assets in good order and at its own
        expense.

                  (c)  The Purchase shall notify the Seller of any amount
        payable in accordance with paragraph (a) above within 15 days of
        the Closing Date, and of any amount payable in accordance with
        paragraph (b) above from time to time after the Closing Date, but
        within 31 days of the discovery that an item included in the
        Assets was not in the physical possession of CBC at the Closing,
        and not, in any event, later than seven months from the Closing
        Date.  The Seller shall pay to the Purchaser any such amount by
        wire transfer or delivery of other immediately available funds
        within ten business days after the date of any such notification,
        failing which the Seller may cause Reorganized CBC to collect such
        amount on its behalf by offset against amounts otherwise due to
        Seller.






                                       - 7 -<PAGE>




                                    ARTICLE III

                                REPRESENTATIONS OF
                       AND WARRANTIES BY CBC AND THE SELLER

                  The Seller and CBC hereby represent and warrant to the
        Purchaser as follows, CBC's liability for any breach of
        representation or warranty being limited as hereinafter provided:

                  SECTION 3.1.  Ownership of the Shares.  Prior to the
        Closing, the Seller will be the record and beneficial owner of the
        Shares, and at the time of the Closing on the Closing Date will
        have (without exception) good, valid and marketable title with
        respect to all such Shares, free and clear of all Liens or other
        defects in title whatsoever.  Upon the delivery of and payment for
        the Shares at the Closing, the Seller will convey good, valid and
        marketable title with respect to all the Shares, free and clear of
        all Liens or other defects in title whatsoever.

                  SECTION 3.2.  Authorization; Valid and Binding
        Agreement.  Subject to the approval of the Bankruptcy Court and
        compliance with applicable requirements of the Bankruptcy Code,
        (i) each of the Seller and CBC has, and both have, full right,
        power and authority to execute and deliver this Agreement and to
        consummate the transactions contemplated hereby; (ii) the Seller
        will have, at the Closing, full right, power and authority to
        execute and deliver the Additional Agreements and to consummate
        the transactions contemplated thereby; (iii) all actions and
        proceedings required to be taken by or on the part of the Seller
        and CBC have been duly and properly taken, and no other action on
        the part of the Seller or CBC is necessary, to authorize the
        execution and delivery of this Agreement and the consummation of
        the transactions contemplated hereby; (iv) this Agreement has been
        duly and validly executed and delivered by the Seller and CBC and,
        assuming the due authorization, execution and delivery of this
        Agreement by the Purchaser, and assuming that this Agreement is
        the valid, binding and enforceable obligation of the Purchaser,
        constitutes the valid and binding agreement of the Seller and CBC
        enforceable against them and each of them in accordance with its
        terms, and (v) at the Closing the Additional Agreements to be
        executed and delivered by the Seller will be duly and validly
        executed and delivered by the Seller and, assuming the due
        authorization, execution and delivery of such Additional
        Agreements by the other parties thereto, will constitute the
        valid, binding and enforceable obligations of the Seller,
        enforceable against it in accordance with its terms.

                  SECTION 3.3.  No Conflicts.  Neither the execution and
        delivery of this Agreement and the Additional Agreements nor the
        consummation at the Closing by the Seller or CBC of the
        transactions contemplated hereby or thereby will (i) violate any
        provision of the Certificate of Incorporation or By-Laws of
        Seller, Old CBC, Reorganized CBC or any Subsidiary (as defined in
        Section 3.5(c)), (ii) violate any statute, rule or regulation of

                                       - 8 -<PAGE>




        any governmental authority or any judgment, decree or order
        applicable to Seller, Old CBC, CBC or any Subsidiary, or (iii)
        except as set forth on Schedule 3.15(a), violate, conflict with,
        or constitute a default (or an event which, with notice or lapse
        of time or both, would constitute a default) or change in control
        under, or result in the creation of a Lien upon any of the
        respective properties or assets of the Seller, CBC or any
        Subsidiary under the terms, conditions or provisions of any
        contract, license, commitment, agreement, understanding,
        arrangement, or restriction of any kind to which the Seller, CBC
        or any Subsidiary is a party or by which the Seller, CBC or any
        Subsidiary or the property or assets of any of them is bound,
        which violation, conflict, default, or change in control in the
        case of clauses (ii) and (iii) hereof, individually or together
        with all such other violations, conflicts, defaults, or changes in
        control would have or, in reasonable contemplation, could have a
        material adverse effect on the ability of the parties to
        consummate the transactions contemplated by this Agreement or on
        the business, assets, relationships with customers, vendors,
        licensors, licensees or regulatory authorities, working capital,
        liabilities, financial condition or results of operations of
        Reorganized CBC or the Diagnostics Business (as hereinafter
        defined) as presently conducted (a "Material Adverse Effect").

                  SECTION 3.4.  Organization, Authority and Qualification
        of the Seller and CBC.  Each of the Seller and CBC is duly
        incorporated, validly existing and in good standing under the laws
        of the State of Delaware, with full corporate power and authority
        to own, lease and operate its properties and assets and to carry
        on its business as currently conducted and is duly qualified as a
        foreign corporation to do business and is in good standing in each
        jurisdiction where, individually or in the aggregate, the failure
        to be so qualified would have or, in reasonable contemplation,
        could have a Material Adverse Effect.

                  SECTION 3.5. Capitalization of CBC; Subsidiaries.

                  (a)  As of the date hereof, the issued and outstanding
        capital stock of Old CBC consists of 26,065,017 shares of Common
        Stock and the total authorized capital stock of Old CBC consists
        of 40,000,000 shares of Common Stock and 5,000,000 shares of
        Preferred Stock.  The issued shares as described above and any
        additional shares issued between the date hereof and the Closing
        are and will be duly authorized, validly issued, and not issued in
        violation of any preemptive rights and are and will be fully paid
        and nonassessable and all such issued shares will immediately
        prior to and at the Closing be owned of record and beneficially by
        the Seller.

                  (b)  There are no options, warrants, conversion or other
        rights, claims, agreements or commitments of any kind obligating
        the Seller, Old CBC or Reorganized CBC to issue any additional
        shares of capital stock of CBC, nor are there any stock
        appreciation, phantom or similar rights outstanding based upon the

                                       - 9 -<PAGE>




        book value or any other attribute of CBC, except the options,
        warrants, conversion or other rights, claims, agreements or
        commitments, stock appreciation, phantom or similar rights
        described on Schedule 3.5(b) of the Information Letter (references
        in this Agreement to a "Schedule" shall mean the Schedules to the
        Information Letter executed and delivered by the parties
        concurrently with the execution and delivery of this Agreement),
        none of which will be binding on Reorganized CBC.  As of the
        Closing, no entity or person will be entitled to any preemptive or
        other similar rights, and there will be no contract or commitment
        that could require the Seller, CBC or Reorganized CBC to sell,
        transfer or otherwise dispose of any capital stock of CBC (other
        than this Agreement).  Upon consummation of the transactions
        contemplated by this Agreement, the Purchaser will directly own
        the entire equity interest in CBC, and share certificates
        reflecting same shall be delivered to Purchaser.

                  (c)  Schedule 3.5(c) lists the Seller, CBC and each of
        the companies and all other entities in which any entity listed on
        Schedule 3.5(c) possesses any equity interest (each such entity,
        except for the Seller, CBC and GRF Corporation, a corporation of
        which CBC owns approximately 19% of the outstanding equity as of
        the date hereof, a "Subsidiary"), identifying which of the
        Subsidiaries are to be transferred to the Seller on or prior to
        the Closing Date and which will be retained by CBC.  The entities
        listed on Schedule 3.5(c) own the percentages set forth on such
        Schedule of voting capital stock of each such entity.  Each
        Subsidiary is duly organized, validly existing and in good
        standing under the laws of the jurisdiction indicated next to its
        name on Schedule 3.5(c), and has the power and authority under its
        organizational documents to carry on its current business and to
        own or lease its current properties.  Each Subsidiary is duly
        licensed or qualified to do business and in good standing as a
        foreign corporation in all jurisdictions where such entity owns or
        leases real property.  Except as set forth on Schedule 3.5(c),
        there are no outstanding options, warrants or other rights to
        purchase or securities convertible into or any contracts or
        commitments to issue or sell capital stock of any Subsidiary.

                  SECTION 3.6.  Financial Information.  The Seller and CBC
        have previously delivered to the Purchaser (i) the audited balance
        sheet of CBC for the fiscal year ended December 31, 1994, and the
        related income statements and statements of cash flows and
        stockholders equity for the years then ended (the "Audited
        Financial Statements"), (ii) the unaudited balance sheet and the
        related statement of income and loss of CBC as of September 30,
        1995, and for the nine months then ended (the "Nine-Month Interim
        Financial Statements"), and (iii) the unaudited pro forma balance
        sheet and the related statement of income and loss of the
        Diagnostics Division as of September 30, 1995, and for the nine
        months then ended (the "Rockville Division Interim Financial
        Statements" and, together with the Nine Month Interim Financial
        Statements, the "Interim Financial Statements").  CBC and the
        Seller have covenanted in Section 6.9 to deliver certain financial

                                      - 10 -<PAGE>




        statements to be prepared after the date hereof (the "Subsequent
        Financial Statements").  The Audited Financial Statements have
        been prepared in accordance with GAAP applied on a consistent
        basis throughout the periods covered thereby, the Interim
        Financial Statements have been prepared in accordance with
        internal accounting procedures applied on a consistent basis
        throughout the periods covered thereby, and the Audited Financial
        Statements and the Interim Financial Statements present fairly the
        financial condition of CBC as of such dates and the results of
        operations of CBC for such periods, are complete and correct, and
        are consistent with the books and records of CBC (which books and
        records are correct and complete).  The Subsequent Financial
        Statements will be prepared in accordance with GAAP, if audited,
        and otherwise in accordance with CBC's internal accounting
        procedures applied on a consistent basis throughout the periods
        covered thereby, will present fairly the financial condition of
        CBC as of the date of their issuance, and the results of
        operations of CBC for such periods, will be complete and correct,
        and will be consistent with the books and records of CBC (which
        books and records will be correct and complete), except that the
        Subsequent Financial Statements will be subject to normal year-end
        adjustments (which will not be material individually or in the
        aggregate) and lack footnotes and other presentation items.  The
        Closing Date Asset Schedule will be complete and correct, and will
        accurately reflect the net book value of the tangible and
        intangible Assets listed thereon in accordance with CBC's internal
        accounting procedures as applied on a consistent basis.

                  SECTION 3.7.  Absence of Undisclosed Liabilities. Except
        (a) as set forth in Schedule 3.7 hereto and (b) for those
        liabilities that are fully reflected or reserved against on the
        Interim Financial Statements (rather than in any notes thereto),
        there are no material liabilities or obligations of any kind,
        contingent or otherwise, whether due or to become due, of CBC or
        any Subsidiary, except for liabilities incurred in the ordinary
        course of business consistent with past practice since
        September 30, 1995, that, either alone or when combined with all
        similar liabilities, would have or, in reasonable contemplation,
        could have a Material Adverse Effect.

                  SECTION 3.8.  Absence of Certain Changes or Events.
        Except (a) as may be set forth in Schedule 3.8 hereto and (b) for
        matters that are fully disclosed, reflected or reserved against on
        the Interim Financial Statements and Audited Financial Statements,
        since January 1, 1995, the Seller, CBC and each of its
        Subsidiaries, as applicable, has conducted the Diagnostics
        Business and all aspects of any other business which aspects would
        have or, in reasonable contemplation, could have a material impact
        upon the Diagnostics Business in the ordinary and usual course and
        consistent with past practice, and except as authorized hereby
        neither the Seller, CBC nor any Subsidiary has (i) entered into or
        amended any material transaction, contract or commitment relating
        to the Diagnostics Business or the Assets or potentially impacting
        the Diagnostics Business or the Assets in any material degree or

                                      - 11 -<PAGE>




        respect, including, without limitation, any employment agreement
        or collective bargaining agreement, and including any lease, which
        is not in the ordinary course of business and consistent with past
        practice; (ii) discharged or satisfied any lien or encumbrance or
        paid any liability, other than current liabilities paid in the
        ordinary course of business; (iii) mortgaged, pledged or subjected
        to any lien, charge or other encumbrance, any of its real estate,
        properties or assets, except liens for taxes (and assessments) not
        delinquent and except for any workmen, repairmen, warehousemen and
        carriers liens and encumbrances arising in the ordinary course of
        business; (iv) sold, assigned, transferred, licensed or encumbered
        any trademarks, patents, know-how or trade secrets of the Seller,
        CBC or any Subsidiary or other intangible assets relating to the
        Diagnostics Business or the Assets or potentially impacting the
        Diagnostics Business or the Assets in any material degree or
        respect, or disclosed any proprietary confidential information to
        any person except disclosure in the ordinary course of business or
        disclosure in connection with information provided to prospective
        purchasers of the Diagnostics Business or other assets in each
        case such disclosure having been made pursuant to a
        confidentiality agreement; (v) made any individual capital
        expenditure or commitment therefor in an amount exceeding $20,000
        or exceeding $50,000 in the aggregate, which requires any
        expenditures by Reorganized CBC or any subsidiary thereof on or
        after the Closing; (vi) incurred any indebtedness for borrowed
        money (including without limitation any guarantees of indebtedness
        of other persons) or incurred or became subject to any liability
        or damages except current liabilities in the ordinary course of
        business pursuant to existing credit arrangements disclosed on the
        Schedules which would or in reasonable contemplation could result
        in any liability for Reorganized CBC; (vii) made any loans or
        advances to, or guarantees for the benefit of, any person or
        amended any loans to, or notes receivable due from, any person;
        (viii) made charitable contributions or pledges in excess of
        $10,000 in the aggregate or charitable contributions or pledges in
        excess of $2,000 in the aggregate which would bind or have any
        material impact upon Reorganized CBC; (ix) entered into, amended,
        modified or terminated any insurance policies payable to CBC or
        any Subsidiary (other than in the ordinary course of business) or
        taken any loans out against any insurance policies payable to CBC
        or any Subsidiary; (x) issued, pledged or otherwise encumbered or
        sold any shares of its capital stock, or issued, sold or created
        any securities convertible into, or options or other rights with
        respect to, or warrants to purchase or rights to subscribe to, any
        shares of its capital stock; (xi) split, combined or reclassified
        any outstanding securities; (xii) declared, set aside, paid or
        made any dividend or other distribution with respect to its
        capital stock, whether payable in cash, stock or property, or
        redeemed or purchased, directly or indirectly, any shares of
        capital stock; (xiii) suffered any damage, destruction or other
        casualty loss which would have or, in reasonable contemplation,
        could have a Material Adverse Effect (whether or not covered by
        insurance); (xiv) except for normal merit increases in the
        ordinary course of business, increased the compensation payable or

                                      - 12 -<PAGE>




        to become payable by CBC or any Subsidiary to any of its officers,
        employees or consultants or increased any bonus, insurance,
        pension or other employee benefit plan, payment or arrangement
        made by CBC or any Subsidiary for or with any such officers,
        employees or consultants which would or in reasonable
        contemplation could result in any liability for Reorganized CBC;
        (xv) other than in the ordinary and usual course of business,
        acquired or disposed of any tangible assets; (xvi) amended its
        Certificate of Incorporation or By-Laws; (xvii) suffered the
        occurrence of any events or circumstances that would have or, in
        reasonable contemplation, could have, in the aggregate, a Material
        Adverse Effect; or (xviii) performed any act or attempt to do any
        act, or permit any act or omission to act within the Seller's or
        CBC's control, which will cause a breach of any material contract,
        commitment or obligation to which the Seller or CBC is a party
        relating to the Diagnostics Business or the Assets or potentially
        impacting the Diagnostics Business or the Assets in any material
        degree or respect; (xix) entered into an agreement to do any of
        the foregoing.

                  SECTION 3.9.  Real Property.  (a) Fee Property. CBC owns
        good and marketable title to the properties listed on Schedule
        3.9(a) hereto (the "Fee Property"), free of any liens, charges or
        encumbrances of any nature whatsoever, except as set forth on such
        Schedule 3.9(a).

                  (b)  Leased Real Properties.  Schedule 3.9(b) hereto
        sets forth a true and complete list of all leases of real property
        (the "Leases") leased by CBC and its Subsidiaries (the "Leased
        Real Property").  No other person or entity has any rights as
        lessee of such property and neither the Seller nor CBC has
        subleased or licensed any others to occupy or use any of the
        Leased Real Property or any portion thereof.  Except as set forth
        on Schedule 3.9(b) hereto, each of the Leases is in full force and
        effect and neither the Seller nor CBC has received any notice of
        default or knows of any default or event or circumstance which,
        with notice or passage of time or both, would give rise to a
        default, under any of the Leases.  CBC and the Seller have
        heretofore delivered to the Purchaser true and complete copies of
        all Leases and all amendments, assignments and supplements thereto
        or thereof.

                  SECTION 3.10.  Title to and Lease of Other Properties;
        Absence of Liens, etc.  Set forth in Schedule 3.10 hereto is a
        complete and accurate list of all personal property owned or
        leased by CBC and its Subsidiaries and included in the Assets,
        excluding the Intellectual Property (as defined below) (the
        "Personal Property").  Except as set forth in Schedule 3.10
        hereto, CBC or the identified Subsidiary has good and valid title
        to or a valid leasehold interest in all the Personal Property,
        free and clear of any Liens, except for: (i) any Liens reflected
        in the Interim Financial Statements; (ii) any Liens arising in the
        ordinary and usual course of business and that do not materially
        interfere with the use by CBC or such Subsidiary or materially

                                      - 13 -<PAGE>




        detract from the value of the property subject thereto or affected
        thereby or which do not otherwise have a Material Adverse Effect;
        and (iii) any Liens for taxes (and assessments) not due and
        payable (collectively, the "Permitted Liens").  Except as set
        forth on Schedule 3.10 hereto, all the Fee Property, Leased Real
        Property and Personal Property and other Assets which are
        necessary for the conduct of the business of the Rockville,
        Maryland operations of CBC (the "Rockville Facility") and the
        other operations to be continued by Reorganized CBC after the
        Closing, as set forth on Annex G (such operations being herein
        referred to as the "Diagnostics Business") are owned by CBC and
        are, to the extent currently used, in such working condition such
        as to permit manufacture in accordance with "Good Manufacturing
        Practice" standards and at Closing will be owned by or leased to
        Reorganized CBC and will be in working condition as stated above,
        and all the Assets listed on Schedule 3.10 are physically present
        at the Rockville Facility.  Upon the Closing, the Assets will be
        transferred entirely free of any lien, claim, security interests,
        conditional and installment sale agreements, encumbrances, leases,
        subleases, defaults, obligation charges or other claims of third
        parties of any kind, except for the Reorganized CBC Obligations,
        except as set forth in Schedule 3.10.

                  SECTION 3.11.  Inventory.  The inventory reflected on
        the Interim Financial Statements and the Subsequent Financial
        Statements has been and will be determined in a manner in
        accordance with CBC's internal accounting practices and, if
        audited, in accordance with GAAP.  Subject to any net realizable
        value reserves included in the Interim Financial Statements and
        the Subsequent Financial Statements, all merchandise inventories
        of CBC and any Subsidiary being retained by CBC are saleable in
        the ordinary course of business and are of merchantable quality,
        and do not consist of "non-marketable" items, meet the usual
        standards of the trade and are suitable for sale in the business
        of CBC or such Subsidiary as presently conducted.  For purposes of
        this paragraph, "non-marketable" items shall, subject to the
        exceptions set forth in Schedule 3.11, include items of finished
        product and packaging material that (i) cannot reasonably be sold
        or used (based on quantities sold or used, as the case may be, in
        the most recent twelve months) through regular channels (as
        distinguished from distress channels) within their unexpired shelf
        life, if applicable, or within twelve months after the Closing,
        whichever is shorter, and (ii) that are discontinued items, and
        shall include items of raw materials and work in process that
        cannot reasonably be used to produce finished products within
        twelve months after the Closing.

                  SECTION 3.12.  Contracts and Leases.  (a) Except as set
        forth on Schedule 3.12(a) hereto, with respect to the Diagnostics
        Business and as disclosed to the Purchaser in the draft lists of
        executory contracts to be assumed and rejected as relates to
        business of CBC other than the Diagnostics Business, CBC, its
        Subsidiaries and its assets are not a party to or bound by any
        agreement written or oral not terminable on 91 days or less notice

                                      - 14 -<PAGE>




        (without payment or condition) which (i) involves the payment by
        CBC or a Subsidiary, or the receipt of revenues by CBC or a
        Subsidiary of more than $15,000 per annum relating to the
        Diagnostics Business or the Assets or potentially impacting the
        Diagnostics Business or the Assets in any material degree or
        respect, (ii) concerns a partnership or joint venture; (iii)
        involves the creation, incurrence, assumption or guarantee of any
        indebtedness for borrowed money, or any lease obligation, in
        excess of $5,000 or under which there is imposed a Lien on any of
        the Assets; (iv) concerns confidentiality or noncompetition
        relating to the Diagnostics Business or the Assets or potentially
        impacting the Diagnostics Business or the Assets in any material
        degree or respect; (v) so far as CBC knows or has reason to
        believe, involves the stockholders of CBC, its Subsidiaries, or
        any of their affiliates; (vi) is a profit sharing, stock option,
        stock purchase, stock appreciation, deferred compensation,
        severance or other plan or arrangement for the benefit of CBC's or
        any Subsidiary's current or former directors, officers, employees
        or consultants; (vii) is a collective bargaining agreement;
        (viii) provides for the advance or loan of any amount to any of
        CBC's or any Subsidiary's directors, officers, employees or
        consultants outside the ordinary course of business; or (ix) would
        have or, in reasonable contemplation, could have, upon a default
        or termination thereof, a Material Adverse Effect (such agreements
        and contracts set forth on Schedule 3.12(a) being referred to
        herein as "Material Contracts").  Except as set forth on Schedule
        3.12(a), (i) CBC and each relevant Subsidiary has in all material
        respects performed all obligations required to be performed by it
        under each Material Contract, and, to the knowledge of CBC: (x)
        each of the Material Contracts is valid and binding and in full
        force and effect, (y) CBC has not received notice and is not aware
        of the assertion of the existence of any material violation of any
        Material Contract, and (z) no event or condition exists which
        constitutes or, after notice or lapse of time or both, would
        constitute a material default on the part of any party under such
        Material Contract.

                  (b)  Except as set forth on Schedule 3.12(b) hereto,
        neither CBC nor any Subsidiary is a party to or bound by any
        contract, agreement or arrangement for the employment (including
        as a consultant) of any director, former director, officer or
        employee of CBC or any Subsidiary, and no director, officer or
        employee or former director, officer or employee of CBC or any
        Subsidiary, or consultant to CBC or any Subsidiary, is or would be
        eligible to receive, or has received, as a result of any of the
        transactions contemplated by this Agreement, any acceleration of
        benefits or vesting or any severance pay, lump sum or other
        payment, compensation or other remuneration from CBC or any
        Subsidiary.

                  (c)  Except as set forth on Schedule 3.12(c) hereto, no
        contract, commitment, agreement or other understanding to which
        CBC or any Subsidiary is a party or by which CBC or any Subsidiary
        is bound restricts or limits the ability of CBC or the Diagnostics

                                      - 15 -<PAGE>




        Business or any Subsidiary to own, possess, use or exploit CBC's
        or such Subsidiary's assets pertaining to the Diagnostics
        Business, or having any impact in any material degree or respect
        upon such Diagnostics Business, in or to any geographic area or to
        conduct CBC's or such Subsidiary's operations, in or to any
        geographic area.

                  (d)  The Seller and CBC have heretofore made available
        to the Purchaser true and correct copies of all the Material
        Contracts (including summaries of oral contracts, if any),
        identified in Schedules 3.12(a), (b) and (c) hereto, together with
        all amendments, exhibits, attachments, waivers or other changes
        thereto.

                  SECTION 3.13.  Litigation.  Except as set forth in
        Schedule 3.13, there are no written claims, actions, suits,
        proceedings or investigations pending or, to the knowledge of the
        Seller, CBC or any Subsidiary, threatened against or affecting the
        Seller, CBC or any Subsidiary at law, in equity or otherwise, in,
        before, or by, any court or governmental agency or authority.
        There are no unsatisfied judgments or outstanding orders,
        injunctions or awards (whether rendered by a court or
        administrative agency or by arbitration) against the Seller, CBC
        or any Subsidiary, or any of the properties of the Seller, CBC or
        any Subsidiary, that would have or, in reasonable contemplation,
        could have a Material Adverse Effect or which could impair the
        ability of the Seller to deliver the Shares as contemplated by
        this Agreement or perform its obligations under this Agreement.

                  SECTION 3.14.  Compliance with Law.  Except as set forth
        in Schedule 3.14, to the knowledge of the Seller and CBC, the
        business of CBC and each of its Subsidiaries has been conducted,
        and will be conducted at all times prior to the Closing Date, in
        compliance with all applicable laws, ordinances and regulations of
        any governmental entity except for possible violations which
        either individually or in the aggregate would not have and, in
        reasonable contemplation, could not have, a Material Adverse
        Effect.  All governmental approvals, permits and licenses required
        to conduct the business of CBC and its Subsidiaries have been
        obtained and are in full force and effect and are being complied
        with in all material respects except for such which either
        individually or in the aggregate would not have and, in reasonable
        contemplation, could not have, a Material Adverse Effect.

                  SECTION 3.15.  Intellectual Property.  (a) CBC and the
        Subsidiaries own or have the right to use pursuant to license,
        sublicense, agreement, or permission all patents, copyrights,
        know-how, trade secrets, trade names, service marks, logos and
        trademarks (the "Intellectual Property") necessary for or normally
        or customarily incident to the operation of the Diagnostics
        Business as presently conducted, either directly or through
        affiliates or third parties as applicable ("Necessary Intellectual
        Property"). Each item of Intellectual Property owned or used by
        any of CBC and its Subsidiaries immediately prior to the Closing

                                      - 16 -<PAGE>




        hereunder and which constitutes part of the Assets will be owned
        or available for use by CBC or the Subsidiary on identical terms
        and conditions immediately subsequent to the Closing hereunder,
        except as noted on Schedule 3.15(a).  Except as noted on Schedule
        3.15(a), CBC has not failed to take any action to protect the
        Intellectual Property where the result of such failure would have
        or, in reasonable contemplation, could have a Material Adverse
        Effect.

                  (b)  Except as noted on Schedule 3.15(b)(i), in
        connection with the Diagnostics Business or any aspect of any
        other business which would have or, in reasonable contemplation,
        could have any material impact or effect upon the Diagnostics
        Business, none of CBC or its Subsidiaries has any knowledge that
        it has infringed upon, misappropriated, used in violation of any
        applicable license, agreement or other restrictions or lawfully
        imposed condition of use contained in or otherwise violated, or
        any reason to believe that it may be infringing upon,
        misappropriating, using in violation of any applicable license,
        agreement or other restrictions or lawfully imposed condition of
        use contained in or otherwise violating, any Intellectual Property
        rights of third parties, and none of the Seller, CBC and the
        directors and officers (and employees and consultants with
        responsibility for Intellectual Property matters) of CBC and its
        Subsidiaries has ever received any written (or, to the best of
        CBC's knowledge, oral) charge, complaint, claim, demand, or notice
        alleging any such interference, infringement, misappropriation, or
        violation (including any claim that CBC or any of its Subsidiaries
        must license or refrain from using any Intellectual Property
        rights of any third party), Except as noted on Schedule
        3.15(b)(ii), to the knowledge of the Seller and the directors and
        officers (and employees and consultants with responsibility for
        Intellectual Property matters) of CBC and its Subsidiaries, no
        third party has interfered with, infringed upon, misappropriated,
        or otherwise come into conflict with any Intellectual Property
        rights of CBC or its Subsidiaries.

                  (c)  Schedule 3.15(c) identifies each patent or
        registration which has been issued to CBC or any Subsidiary with
        respect to any of its Intellectual Property which constitutes part
        of the Assets, identifies each pending patent application or
        application for registration which the Seller, CBC or any
        Subsidiary has made with respect to any of such Intellectual
        Property, and identifies each license, agreement, or other
        permission which the Seller, CBC or any Subsidiary has granted to
        any third party with respect to any of such Intellectual Property,
        specifying in each case the Intellectual Property affected.  The
        Seller and CBC have made available to the Purchaser correct and
        complete copies of all such patents, registrations, applications,
        licenses, agreements, and permissions (as amended to date) and has
        made available to the Purchaser for inspection and/or copying
        correct and complete copies of all other written documentation
        evidencing ownership and prosecution (if applicable) of each such
        item.  Schedule 3.15(c) also identifies each trade name or

                                      - 17 -<PAGE>




        unregistered trademark used by the Seller, CBC and each of the
        Subsidiaries in connection with the Diagnostics Business, with
        respect to each item of Intellectual Property required to be
        identified in Schedule 3.15(c), except as noted on Schedule
        3.15(b):

                  (i)  CBC or its identified Subsidiary possesses all
             right, title, and interest in and to the item, free and clear
             of any Lien;

                 (ii)  the item is not subject to any outstanding
             injunction, judgment, order, decree, ruling, or charge;

                (iii)  no action, suit, proceeding, hearing,
             investigation, charge, complaint, claim, or demand is pending
             or, is to the knowledge of CBC threatened which challenges
             the legality, validity, enforceability, use, or ownership of
             the item; and

                 (iv)  none of CBC and its Subsidiaries has ever agreed to
             indemnify any person for or against any infringement or
             misappropriation with respect to the item.

                  (d)  Schedule 3.15(d) identifies each item of
        Intellectual Property that any third party owns and that any of
        CBC or its Subsidiary uses pursuant to license, sublicense,
        agreement, or permission in the Diagnostics Business.  The Seller
        and CBC have made available to the Purchaser correct and complete
        copies of all such licenses, sublicenses, agreements, and
        permissions (as amended to date).  With respect to each item of
        Intellectual Property required to be identified in Schedule
        3.15(d), except as noted on Schedule 3.15(d):

                  (i)  the license, sublicense, agreement, or permission
             covering the item is legal, valid, binding, enforceable, and
             in full force and effect;

                 (ii)  the license, sublicense, agreement, or permission
             will continue to be legal, valid, binding, enforceable, and
             in full force and effect on identical terms following the
             Closing;

                (iii)  neither CBC nor, to the knowledge of the Seller or
             CBC, any other party to the license, sublicense, agreement,
             or permission is in breach or default, and, to the knowledge
             of the Seller and CBC, no event has occurred, and neither the
             Seller-nor CBC has any reason to believe that any event is
             occurring, which with notice or lapse of time would
             constitute a breach or default or permit termination,
             modification, or acceleration thereunder, nor, to the
             knowledge of the Seller or CBC, has any act or omission
             occurred (nor does the Seller or CBC have any reason to
             believe that any such act or omission is occurring) which


                                      - 18 -<PAGE>




             could reasonably be contended to constitute a breach or
             default of any of the terms thereunder;

                 (iv)  to the knowledge of the Seller and CBC, no party to
             the license, sublicense, agreement, or permission has
             repudiated any provision thereof;

                  (v)  insofar as CBC, the Seller or such Subsidiary has
             knowledge or reason for belief, with respect to each
             sublicense, the representations and warranties set forth in
             Subsections (i) through (iv) above are true and correct with
             respect to the underlying license;

                 (vi)  the underlying item of Intellectual Property is not
             subject to any outstanding injunction, judgment, order,
             decree, ruling, or charge;

                (vii)  no action, suit, proceeding, hearing,
             investigation, charge, complaint, claim, or demand is pending
             or to the knowledge of the Seller or CBC, is threatened which
             challenges the legality, validity, or enforceability of the
             underlying item of Intellectual Property; and

               (viii)  neither the Seller CBC nor any of the of the
             Subsidiaries has granted any sublicense or similar right with
             respect to the license, sublicense, agreement, or permission.

                  (e)  To the knowledge of the Seller and the directors
        and officers (and employees and consultants with responsibility
        for Intellectual Property matters) of CBC and its Subsidiaries,
        neither CBC nor any of its Subsidiaries will interfere with,
        infringe upon, misappropriate, or otherwise come into conflict
        with, any Intellectual Property rights of third parties as a
        result of the continued operation of the Diagnostics Business.

                  (f)  Except as disclosed on Schedule 3.15(f), and based
        solely on the certificate of CBC's consultant, Frederick V.
        Casselman, neither the Seller nor CBC has any knowledge of any
        products owned by competitors of CBC which reasonably could be
        expected to supersede or make obsolete within eighteen months from
        the date hereof the HIV-1 Western Blot product, or the HTLV-I
        (rp2le enhanced) EIA.

                  SECTION 3.16.  Employee Benefits.  (a) Schedule 3.16
        sets forth a true and complete list of all employee benefit plans,
        agreements, commitments, practices or arrangements of any type,
        maintained, sponsored or contributed to by CBC or by any entity
        which is affiliated with CBC under Section 414(b), (c), (m), or
        (o) of the Code or Section 4001 of ERISA ("ERISA Affiliate") for
        the benefit of any employee, former employee, or director of CBC
        or an ERISA Affiliate, or with respect to which CBC or an ERISA
        Affiliate has a liability, whether direct or indirect, actual or
        contingent (the "Plans").  Schedule 3.16 identifies each of the
        Plans that is an "employee benefit plan" as defined in Section

                                      - 19 -<PAGE>




        3(3) of ERISA (the "ERISA Plans").  With respect to each Plan, CBC
        has delivered to Purchaser true and complete copies of:

                  (i)  any and all plan texts and agreements, including
             amendments;

                 (ii)  all material employee communications (including
             summary plan descriptions or material modifications, if any);

                (iii)  the two most recent annual reports and actuarial
             reports, if required under ERISA;

                 (iv)  the most recent determination letter received from
             the Internal Revenue Service with respect to each Plan
             intended to qualify under Section 401(a) of the Code; and

                  (v)  any other material documents, including any
             applicable trust or other funding agreement and the latest
             financial statements thereof.

                  (b)  Each Plan has been operated and administered in
        accordance with its terms and applicable law, including but not
        limited to ERISA and the Code.  All contributions required to be
        made under the terms of any Plan have been made timely.  There are
        no pending, threatened, or anticipated claims (other than routine
        claims for benefits) involving any Plan.  There are no unpaid
        penalties, fines or judgments, whether or not past due, involving
        any of the Plans.  Except as set forth on Schedule 3.16, all
        filings and submissions required to be made by law in respect of
        any of the Plans have been made timely, to the appropriate
        authority and were complete in all material respects.  All
        amendments, changes or modifications to any of the Plans have been
        made in accordance with the terms of such Plan and applicable law.
        No Plan by its terms requires CBC to continue to employ any
        employee, director or consultant.

                  (c)  Each ERISA Plan intended to be "qualified" within
        the meaning of Section 401(a) of the Code has been determined by
        the Internal Revenue Service to be so qualified (or timely
        application has been made therefor); no event has occurred since
        the date of such determination that would adversely affect such
        qualification; and each trust maintained thereunder has been
        determined by the Internal Revenue Service to be exempt from
        taxation under Section 501(a) of the Code.  No breach of fiduciary
        duty or prohibited transaction has occurred with respect to which
        CBC or any ERISA Plan would be liable or otherwise damaged in any
        material way.  Each ERISA Plan that is maintained, sponsored or
        contributed to by CBC for the benefit of employees, former
        employees, or directors may be amended, modified or terminated by
        CBC without liability to itself except for benefits accrued to the
        effective date of such termination.

                  (d)  With respect to each Plan that provides welfare
        benefits of the type described in Section 3(l) of ERISA: (i) no

                                      - 20 -<PAGE>




        such plan provides medical or death benefits with respect to
        employees, former employees, or directors of CBC more than thirty
        days beyond their termination of employment, other than coverage
        mandated by Sections 601-608 of ERISA and 498OB(f) of the Code;
        (ii) each such plan has been administered in compliance with
        Sections 601-608 of ERISA where applicable and 498OB(f) of the
        Code where applicable; and (iii) no such plan has reserves,
        assets, surpluses or prepaid premiums.

                  (e)  No ERISA Plan is a "multiemployer pension plan"
        within the meaning of Sections 3(37) or 4001(a)(3). nor a plan
        described in Section 4063(a) of ERISA, nor a plan subject to the
        funding standards set forth under Section 412 of the Code.
        Neither CBC or any ERISA Affiliate has ever maintained, sponsored
        or contributed, or has ever had any liability with respect to, any
        multiemployer pension plan, any plan described under Section
        4063(a) of ERISA, or any plan subject to the funding standards set
        forth under Section 412 of the Code.

                  (f)  No Plan has assets consisting of "employer
        securities" within the meaning of Section 407(d)(1) of ERISA.

                  (g)  Except as set forth on Schedule 3.12(b), the
        consummation of the transactions contemplated by this Agreement
        will not (i) entitle any individual to severance pay, or (ii)
        accelerate the time of payment, or increase the amount, of
        compensation due any individual.  No payment made or contemplated
        under any of the Plans constitutes an "excess parachute payment"
        within the meaning of Section 28OG of the Code.

                  SECTION 3.17.  Environment.  (a) Environmental
        Compliance Status of Properties.  (i) Except as disclosed on
        Schedule 3.17(b), all activities, business and operations of the
        Seller, CBC and its Subsidiaries on the Fee Property and the
        Leased Real Properties, and any tenant, licensee or permittee
        thereof, or of any third person on any of the Fee Property or the
        Leased Real Properties (regardless of whether with the authority
        or permission of CBC) have been conducted in all material respects
        in compliance with any and all applicable federal, state, county,
        municipal or other applicable environmental or nuclear regulatory
        laws, ordinances, regulations, orders, directives or other
        requirements of such governmental authorities ("Environmental
        Requirements"); and (ii) the Seller, CBC and its Subsidiaries, and
        any tenant, licensee or permittee thereof, have all permits and
        licenses required to be issued by any governmental authority
        pursuant to Environmental Requirements and are in full compliance
        with all material terms and conditions of such permits and
        licenses.  Except as disclosed on Schedule 3.17(b), insofar as the
        Seller, CBC or any Subsidiary has knowledge or reason for belief,
        no change in the facts or circumstances reported or assumed in the
        application for or granting of such permits or licenses exists,
        and such permits and licenses are in full effect.



                                      - 21 -<PAGE>




                  (b)  No Notice of Violation or Litigation.  Except as
        set forth in Schedule 3.17(b), (i) neither CBC nor the Seller nor
        any Subsidiary has received notice or other communication
        concerning any alleged violation of Environmental Requirements, or
        notice or other communication concerning alleged liability for
        damages caused by any such violation, nor has it been served with
        any writ, injunction, decree, order or judgment outstanding, nor
        any lawsuit, claim, proceeding, citation, directive, summons or
        investigation, pending or threatened, relating to the ownership,
        use maintenance or operation of the Leased Real Properties or the
        Fee Property by any person, arising from the alleged violation of
        Environmental Requirements, which alleged violation or violations,
        individually or in the aggregate, would have or, in reasonable
        contemplation, could have a Material Adverse Effect, nor does
        there exist any basis for such lawsuit, claim, proceeding,
        citation, directive, summons or investigation being instituted or
        filed; and (ii) no such notice, communication, writ, injunction,
        decree, order or judgment outstanding has been served on any of
        the tenant, licensee or permittee of the Seller or CBC or any of
        the Fee Property or any Leased Real Properties.

                  (c)  No Hazardous Substances or Containers on
        Properties; Use of Hazardous Substances.  Except as set forth in
        Schedule 3.17(b), neither the Seller, CBC, any Subsidiary, nor any
        tenant, licensee or permittee thereof nor any of the Fee Property
        or the Leased Real Properties, has used, stored, handled, disposed
        of or transferred any hazardous, toxic or radioactive substances,
        materials or wastes, pollutants or contaminants, as defined,
        listed or regulated by any federal, state or local law, regulation
        or order ("Hazardous Substances"), or maintained containers or
        sources thereof, at, on or under any of the Leased Real Properties
        or the Fee Property, including, without limitation, underground
        storage tanks, asbestos or asbestos-containing building materials
        and electrical transformers, capacitors, ballasts or other
        equipment, or equipment which contains dielectric fluid containing
        PCBS, except in compliance in all material respects with
        applicable Environmental Requirements.  Each of CBC and its
        Subsidiaries has established and adhered to internal regulations
        regarding the use, storage, handling, disposition and transfer of
        Hazardous Substances.

                  (d)  No Releases or Improper Disposition or Maintenance
        of Hazardous Substances.  Except as set forth on Schedule 3.17(b),
        neither the Seller, CBC, the Subsidiaries nor any tenant, licensee
        or permittee, has spilled, discharged, released, or emitted any
        Hazardous Substance in, on or under any of the Fee Property or the
        Leased Real Properties, or caused any Hazardous Substance to
        migrate from the Fee Property or the Leased Real Property, in a
        manner that would have or, in reasonable contemplation, could have
        a Material Adverse Effect, and in the event that Seller, CBC, any
        Subsidiary or tenant has caused or permitted any Hazardous
        Substance to be removed from the Fee Property or the Leased Real
        Property or otherwise to be disposed of, such removal or disposal
        has been accomplished in full compliance with all Environmental

                                      - 22 -<PAGE>




        Requirements, and in respect of all such Hazardous Substances so
        removed or disposed of, in whatever state, condition or location
        the same or the residue thereof may be presently situate, all such
        Environmental Requirements applicable have continuously been, are
        and shall remain fully complied with.

                  SECTION 3.18.  Health and Safety.  Except as noted on
        Schedule 3.18 and Schedule 3.17(b), to the knowledge of the Seller
        and CBC, during the period commencing September 1990, CBC and its
        Subsidiaries and their respective predecessors and affiliates have
        complied with the Occupational Safety and Health Act of 1970, as
        amended, and all other laws (including rules, regulations, codes,
        plans, injunctions, judgments, orders, decrees, rulings and
        charges) of federal, state, local and foreign governments (and all
        agencies thereof) concerning public health and safety, or employee
        health and safety except for possible violations which either
        individually or in the aggregate would not have or, in reasonable
        contemplation, could not have, a Material Adverse Effect.

                  SECTION 3.19.  Tax Matters and Social Charges.  (a)
        Except as set forth on Schedule 3.19(a), each of the Seller, CBC,
        any Subsidiary and any other member of the Seller Group has duly
        and timely filed (either separately or on a consolidated or
        combined basis) all Tax Returns that they were required to file by
        applicable law and that each such Tax Return was correct and
        complete in all respects. The Term "Seller Group" as used in this
        Agreement shall mean CBC and any Subsidiary, and shall include,
        from and after the acquisition of the Shares by the Seller, the
        Seller, (and any corporation with regard to which the Seller, as
        applicable, CBC or any Subsidiary is a successor in interest) and
        every other entity included in a federal, national, state, county,
        local or other consolidated or combined income tax return filed by
        or otherwise including any of the Seller, as applicable, CBC and
        any Subsidiary (and any corporation with regard to which any of
        those entities is a successor in interest) and with respect to
        which the Seller, as applicable, CBC or any Subsidiary could have
        any liability for anything reported or disclosed on, or omitted
        from such return.  The term "Tax Returns" as used in this
        Agreement shall mean all returns, declarations, reports, claims
        for refund, or information returns or statements relating to Taxes
        or Social Charges including any schedule or attachment thereto,
        and including any amendment thereof.  The term "Taxes" as used in
        this Agreement shall mean any federal, national, state, county,
        local and other taxes, minimum taxes, assessments, interest,
        penalties or additions thereto and deficiencies, duties, fees and
        other governmental or governmental authority or taxing district
        charges or impositions of each and every kind whatsoever whether
        assessed against or measured by gross receipts, income, real and
        personal property, occupation, production, license payroll,
        employment, excise, severance, stamp, premiums, sales, use, value
        added, windfall profits, environmental factors, capital stock,
        franchise, transfer, registration accumulation or otherwise, and
        in each case whether disputed or not.  The term "Social Charges"
        as used in this Agreement shall mean all taxes, contributions and

                                      - 23 -<PAGE>




        charges imposed by any federal, state or local governmental
        authority or agency thereof for the provision of retirement,
        disability, hospitalization, occupational injury and sickness,
        unemployment or other benefits relating to the welfare of
        employees or agents, including interest, penalties or additions
        thereto.

                  (b)  Except as disclosed in Schedule 3.19(b), all Taxes
        and Social Charges of the Seller, CBC, any Subsidiary and every
        other member of the Seller Group whether or not shown on any Tax
        Return have been (i) properly and fully paid to the extent due and
        payable and (ii) adequately provided for in a reserve for Tax
        Liability (excluding any provision for deferred income taxes) set
        forth on the face of the Audited Financial Statements and the
        Interim Financial Statements Balance Sheet in the case of Taxes
        (except for any Taxes arising from the Section 338 Election) or
        Social Charges payable or anticipated to be payable on account of
        the operations, acts or omissions of any member of the Seller
        Group for any and all taxable periods up to and including the
        Closing Date.  Neither the Seller, CBC, any Subsidiary nor any
        member of the Seller Group has or will have any liability whether
        direct, indirect, fixed or contingent, for any Taxes or Social
        Charges, for any and all taxable periods, in excess of the
        reserves (excluding any provision for deferred income taxes) for
        Taxes and Social Charges established on the books of each of them.

                  (c)  Each of the Seller, CBC and any Subsidiary has
        withheld and paid all Taxes and Social Charges required to have
        been withheld and paid in connection with amounts paid or owing to
        any employee, independent contractor, creditor, stockholder, or
        other third party.

                  (d)  Except as disclosed in Schedule 3.19(b), no member
        of the Seller Group is delinquent in the Payment of any Taxes or
        Social Charges nor has any of them requested or been granted any
        extension of time within which to file any Tax Return or to pay
        any Taxes or Social Charges except to the extent that such Tax
        Return has since been filed or such Taxes or Social Charges have
        since been paid.

                  (e)  No member of the Seller Group has received written
        notice or is otherwise aware of any claim by any authority in a
        jurisdiction in which any member of the Seller Group does not file
        a Tax Return that such member is or may be subject to taxation by
        that jurisdiction.

                  (f)  Schedule 3.19(f) lists all federal, state, local
        and foreign income Tax Returns filed within respect to the Seller,
        CBC and any Subsidiary for taxable periods ended and or after
        January 1, 1987 and indicates those Tax Returns that have been
        audited as well as those that currently are the subject of audit.
        The Seller has delivered to the Purchaser correct and complete
        copies of all federal and state income tax returns, examination
        reports, and statements of deficiencies assessed against or agreed

                                      - 24 -<PAGE>




        to by the Seller, CBC and any Subsidiary as well as any statements
        of deficiency assessed against or agreed to by any other member of
        the Seller Group, and shall promptly deliver to the Purchaser such
        returns, reports and statements with respect to the period from
        and after the date hereof through the Closing Date.

                  (g)  Except as set forth on Schedule 3.19(g), no member
        of the Seller Group (i) has knowledge, however obtained, of any
        assessment, dispute or claim threatened or asserted by any
        governmental authority concerning any Tax liability or Social
        Charge for any such period (ii) is aware of any issue which has
        been raised by a relevant authority concerning Taxes or Social
        Charges in any examination or otherwise, which by application of
        the same or similar principles, reasonably could be expected to
        result in a proposed deficiency, for any such period, (iii) is
        aware of the existence or any current or past state of facts which
        would constitute grounds for any such deficiency or (iv) has a
        request for a ruling or determination in respect of any Taxes or
        Social Charges now pending or which was previously rejected or
        withdrawn.

                  (h)  No member of the Seller Group has waived any
        statute of limitations in respect of Taxes or Social Charges or
        agreed to any extension of time with respect to Tax or Social
        Charge assessment or deficiency and no power of attorney granted
        by any member with respect to any matter related to Taxes or
        Social Charges is currently in force.

                  (i)  No election pursuant to any tax laws has been made
        with respect to the Seller, CBC or any Subsidiary which assuming
        an election is made under Section 338 of the Internal Revenue Code
        of 1986, as amended (the "Code") would be binding on CBC and any
        Subsidiary after the closing.  All agreements to which CBC or any
        Subsidiary is a party as to the allocation or sharing of liability
        for Taxes or Social Charges will be terminated on or before the
        Closing and neither CBC nor any Subsidiary will have any remaining
        liability under these agreements.

                  (j)  None of the Seller, CBC or any Subsidiary has filed
        a consent under Code Section 341(f) concerning collapsible
        corporations.  None of the Seller, CBC or any Subsidiary is
        required to include in income for any period after closing any
        adjustments required under Code Section 481.  None of the Seller,
        CBC or any Subsidiary has made any payments, is obligated to make
        any payments, or is a party to any agreement that under certain
        circumstances could obligate it to make any payments that will not
        be deductible under Code Section 280G.  No tax is required to be
        withheld pursuant to Code Section 1445 as a result of any of the
        transfers contemplated by this Agreement.  Each of the Seller, CBC
        and any Subsidiary has disclosed on its federal income Tax Returns
        all positions taken therein that could give rise to a substantial
        understatement of federal income Tax within the meaning of Code
        Section 6662 or the comparable provisions of any foreign, state or
        local tax law.  None of the property owned or used by CBC or any

                                      - 25 -<PAGE>




        Subsidiary is subject to a tax benefit transfer lease executed in
        accordance with Section 168(f)(8) of the Internal Revenue Code of
        1954 as in effect before the enactment of Pub.L. 97-248, is
        subject to a lease, other than a "true" lease for federal income
        tax purposes or is "tax-exempt use property" within the meaning of
        Code Section 168(h).  There are no liens for Taxes for Social
        Charges upon the assets of the Seller, CBC or any Subsidiary
        except liens for current Taxes or Social Charges not yet due.
        Neither CBC nor any Subsidiary is currently under any contractual
        obligation to pay the Tax Social Charges obligations of any other
        person, or to pay the Tax obligations with respect to transactions
        relating to any other person, or to indemnify any other Person
        with respect to any Tax, or Social Charges.  CBC and any
        Subsidiary has filed a protective carryover election in connection
        with each transaction previously consummated that constituted a
        "qualified stock purchase" within the meaning of Code Section 338.
        Neither CBC nor any Subsidiary owns any interest in real property
        in a jurisdiction in which a tax is imposed on the transfer of a
        controlling interest in an entity that owns any interest in real
        property.

                  (k)  As of the Closing, the Seller, CBC and any
        Subsidiary will be affiliated (within the meaning of Section 1504
        of the Code) and the Seller will constitute a "Selling Affiliate"
        within the meaning of Treas. Reg. 1-338(h)(10)-l.

                  SECTION 3.20.  Insurance.  Schedule 3.20 contains a true
        and complete list of all liability, property, workers'
        compensation, directors and officers liability and other similar
        insurance of CBC and its Subsidiaries relating to the ownership,
        use or operation of any of the assets or properties of CBC and its
        Subsidiaries.  The Seller has made available to the Purchaser
        copies of such insurance policies prior to the date hereof.  All
        such policies are presently in full force and effect, and shall
        continue to be in full force and effect on identical terms
        following the consummation of the transactions contemplated hereby
        with respect to Assets, the Rockville Facility and the Diagnostics
        Business.  As of the date hereof, except as set forth on Schedule
        3.20, (i) neither CBC nor any Subsidiary has received any written
        or to the knowledge of CBC, oral notice or other indication of
        clear import from any insurer or agent of any intent to amend or
        cancel any such insurance policy, and (ii) to CBC's knowledge, all
        claims which CBC and its Subsidiaries have submitted under all
        such insurance policies have been submitted on a timely basis to
        the appropriate party.  CBC and any Subsidiaries and any
        subsidiaries it may have had from time to time during the past ten
        years have been covered during the past ten years (or, in the case
        of any such Subsidiary or subsidiary, such shorter period during
        which any such Subsidiary or subsidiary was a subsidiary of CBC)
        by insurance similar in scope and amount to that listed on
        Schedule 3.20.

                  SECTION 3.21.  Insider Interests.  Except as set forth
        in Schedule 3.21, no Related Party (as defined herein) has

                                      - 26 -<PAGE>




        received a loan or advance from CBC or any Subsidiary which is
        outstanding as of the date hereof.  From and after the Closing
        Date, no person or entity who is a Related Party as of the date of
        the Interim Financial Statements will have the right to borrow
        from CBC or any Subsidiary or any obligation to make any loan to
        CBC or any Subsidiary.  During the period from the date hereof
        through the Closing Date, CBC and its Subsidiaries will not lend
        money to or borrow money from any Related Party.  Except as set
        forth in Schedule 3.21, as of the date hereof, no officer,
        director, employee or consultant of CBC or any Subsidiary has any
        business relationship with CBC or any Subsidiary other than in his
        or her capacity as an officer, director, employee or consultant.
        "Related Party" means any person or entity controlled by,
        controlling or under common control with CBC or its Subsidiary and
        shall include, without limitation, the Seller, each of CBC's and
        its Subsidiaries' officers, directors, employees and consultants,
        and any person who is a member of the family of any such person.

                  SECTION 3.22.  Customers and Suppliers.  Schedule 3.22
        lists the ten largest customers of and the ten largest suppliers
        to CBC and its Subsidiaries relating to the Diagnostics Business
        during calendar year 1995.  Except as noted on Schedule 3.22,
        neither CBC nor any of its Subsidiaries has received any written,
        or to the knowledge of CBC or such Subsidiary, oral notice or
        other indication that any such customer intends to terminate or
        materially reduce its business with CBC or any Subsidiary.

                  SECTION 3.23.  Products and Warranties.  To the
        knowledge of the Seller and CBC, the products currently sold by
        CBC conform in all material respects with, and meet or exceed the
        standards required by, all applicable governmental laws,
        ordinances and regulations now in effect.  To the knowledge of
        CBC, each product manufactured, sold, leased or delivered by CBC
        since January 1, 1990 has been in conformity in all material
        respects with all applicable contractual commitments and all
        express and implied warranties and all applicable governmental
        laws, ordinances and regulations in effect at the applicable time.
        Except as set forth in Schedule 3.23(a), neither the Seller nor
        CBC has received any written claims of customers or others made
        out of the ordinary course of business based upon an alleged or
        admitted defect of material, workmanship or design or otherwise in
        respect of any of CBC's products relating to the Diagnostics
        Business that are presently pending or, to the knowledge of the
        Seller or CBC, threatened against it that would have or, in
        reasonable contemplation, could have a Material Adverse Effect,
        and there is no basis for any present or future action arising out
        of the ownership, possession or use of any product manufactured by
        CBC.  No product manufactured, sold, leased or delivered by CBC is
        subject to any guaranty, warranty or other indemnity beyond
        (i) the applicable standard terms and conditions of sale or lease,
        which are set forth on Schedule 3.23(b) or (ii) the terms and
        conditions of sale or lease contained in the applicable contract
        of sale or lease listed on Annex B.


                                      - 27 -<PAGE>




                  SECTION 3.24.  Disclosure.  No representation or
        warranty by the Seller or CBC contained in this Agreement and no
        statement contained in the Schedules hereto or any certificate
        delivered by the Seller or CBC to the Purchaser pursuant to this
        Agreement contains any untrue statement of a material fact or
        intentionally omits to state any related material facts in such
        manner as to cause the statements made to be materially
        misleading.  The disclosures contained in the Disclosure Statement
        and the Plan of Reorganization comport with the requirements of
        law and notwithstanding any assertion or reservation to the
        contrary the Disclosure Statement and Plan of Reorganization may
        be relied on by Purchaser and CBC before any tribunal to
        demonstrate notice to third parties of the matters therein set
        forth to the extent that the same may be applicable or relevant.

                  SECTION 3.25.  FIRPTA.  The Seller is not a "foreign
        person" as defined in Section 1445 of the Internal Revenue Code of
        1986, as amended, and the regulations issued thereunder (the "Code
        Withholding Section").  At or prior to the Closing, the Seller
        shall deliver to the Purchaser a certification stating that the
        Seller is not a foreign person, which certification shall be in
        the form then required by the Code Withholding Section.

                  SECTION 3.26.  Conduct During the Pendency of the
        Bankruptcy Case.  During the pendency of the Bankruptcy Case,
        neither the Seller, CBC nor any Subsidiary has taken any action
        without authorization of the Bankruptcy Court for which such
        authorization was required, nor taken any action pursuant to any
        applicable order of the Bankruptcy Court, which contravenes,
        violates, conflicts with, exceeds the authority of, or is
        otherwise inconsistent with the terms of such order, in either
        case where such action would or in reasonable contemplation could
        have any adverse effect upon the Diagnostics Business or the
        Assets and the same is not cured prior to the Closing.


                                    ARTICLE IV

                              REPRESENTATIONS OF AND
                            WARRANTIES BY THE PURCHASER

                  The Purchaser hereby represents and warrants to the
        Seller as follows:

                  SECTION 4.1.  Organization.  The Purchaser is duly
        incorporated, validly existing and in good standing under the laws
        of its jurisdiction of incorporation, with full corporate power
        and authority to own, lease and operate its properties and assets
        and to carry on its business as currently conducted and to
        consummate the transactions contemplated hereby.

                  SECTION 4.2.  Authorization: Valid and Binding
        Agreement.  The Purchaser has full right, power and authority to
        execute and deliver this Agreement and to consummate the

                                      - 28 -<PAGE>




        transactions contemplated hereby.  All actions and proceedings
        required to be taken by or on the part of the Purchaser have been
        duly and properly taken, and no other action on the part of the
        Purchaser is necessary, to authorize the execution and delivery of
        this Agreement and the consummation of the transactions
        contemplated hereby.  This Agreement has been duly and validly
        executed and delivered by the Purchaser, and, assuming the due
        authorization, execution and delivery of this Agreement by the
        Seller, and assuming that this Agreement is the valid, binding and
        enforceable obligation of the Seller, constitutes the valid and
        binding obligation of the Purchaser.

                  SECTION 4.3.  No Conflicts.  Neither the execution and
        delivery of this Agreement nor the consummation at the Closing by
        the Purchaser of the transaction contemplated hereby will
        (i) violate any provision of the Certificate of Incorporation or
        By-Laws of the Purchaser, (ii) violate in any material respect any
        statute, rule or regulation of any governmental authority or any
        judgment, decree or order applicable to the Purchaser, or
        (iii) violate, conflict with or constitute a default (or an event
        which, with notice or lapse of time or both, would constitute a
        default) under the terms, conditions or provisions of any
        contract, commitment, agreement, understanding or restriction of
        any kind to which the Purchaser is a party or by which the
        Purchaser is bound, which violation, conflict or default, together
        with all such other violations, conflicts or defaults, could
        impair the ability of the Purchaser to consummate the transactions
        contemplated by this Agreement.


                                     ARTICLE V

                                  INDEMNIFICATION

                  SECTION 5.1.  Survival of Representations and
        Warranties.  The representations and warranties of the Seller,
        CBC, the Subsidiaries and the Purchaser contained in this
        Agreement or in any instrument delivered pursuant hereto or
        thereto shall survive the Closing Date, regardless of any
        investigation made by or on behalf of any party hereto, and shall
        remain in full force and effect thereafter until three years after
        the Closing Date; provided, however, that the representations and
        warranties contained in Sections 3.1, 3.2, 3.5, 3.9 and 3.19 shall
        survive for the longest period permitted by applicable law, and
        the representations and warranties contained in Sections 3.16,
        3.17 and 3.18 shall survive until the applicable statutes of
        limitations have run.  No action or proceeding may be brought with
        respect to any Losses (as defined herein) unless written notice
        thereof, setting forth in reasonable detail each such Loss, shall
        have been delivered to the Seller prior to the expiration of the
        applicable survival periods set forth above and if such claim is
        not satisfied, action is brought by the Purchaser within the later
        of six months from the date of such notice or the expiration of
        the applicable survival period.

                                      - 29 -<PAGE>




                  SECTION 5.2.  Indemnification by the Seller and CBC.
        (a) Subject to the limitations on the scope of CBC's
        indemnification that are set forth below, each of the Seller and
        CBC hereby agrees to indemnify, defend and hold the Purchaser, its
        officers, directors, agents and affiliates and, from and after the
        Closing, CBC (collectively, the "Purchaser's Indemnified Parties")
        harmless from and against any and all claims, losses, liabilities,
        costs, damages, interest, penalties, fines and expenses (including
        attorneys' fees and expenses incurred in connection with any of
        the foregoing and in seeking indemnification hereunder in any case
        in which such claim for indemnification results in judgment in
        favor of the Indemnitee) (collectively, "Losses") that they may
        suffer, sustain, incur or become subject to arising out of, in
        connection with or due to (i) any inaccuracy of any representation
        or warranty or the breach of any warranty, covenant, undertaking
        or other agreement of the Seller or CBC contained in this
        Agreement or the Schedules or any certificate delivered to the
        Purchaser hereunder, (ii) any liabilities of CBC existing
        immediately prior to the Closing or arising in respect of any
        period or event, condition, conduct, agreement (other than a
        Reorganized CBC Obligation), act or omission that occurred or
        existed prior to the Closing (and, in the case of any such
        agreement, any liability in connection thereunder that arises at
        any time whether before or after the Closing), including in
        respect of any of the operations or business or properties of CBC
        and its current or past subsidiaries or associated companies, or
        any other entity listed on Schedule 3.5(c), and regardless of
        actual or alleged fault or misconduct of or violation by any such
        entities or persons (except that in no event shall Purchaser be
        entitled to indemnification for Reorganized CBC Obligations), and
        including, without limitation:

                  (i)  the matters that are described (or, if accurate
                       disclosure with respect to any such matter was not
                       made, that would properly have been described) on
                       Schedules 3.7, 3.13, 3.14, and, to the extent that
                       such Schedule makes reference to liabilities
                       accruing prior to the Closing, 3.15(b)(i) (except
                       that the Seller gives no indemnity against any
                       order or judgment on appeal reversing the judgment
                       issued by the United States Bankruptcy Court on
                       September 1, 1995 in the case of Institut Pasteur
                       and Genetic Systems Corporation vs.  Cambridge
                       Biotech Corporation, Adversary Proceeding No.
                       95-4074 (the "Genetic Systems Litigation") nor
                       against any ensuing adverse order or judgment in
                       such case (other than any monetary liability or
                       judgment paid by Reorganized CBC to a party to such
                       litigation as a result of conduct by CBC prior to
                       the Closing);

                 (ii)  any matter referred to in Schedule 3.17(a)-(d);



                                      - 30 -<PAGE>




                (iii)  any Loss CBC may suffer in connection with or as a
                       consequence of a breach of a representation or
                       warranty contained in Section 3.19;

                 (iv)  any product liability matters relating to products
                       manufactured or sold by CBC prior to the Closing
                       Date;

                  (v)  any matters arising otherwise than in connection
                       with the Diagnostics Business.

        and (iii) any event, condition, conduct, act or omission that
        occurs from and after the Closing in respect of the assets,
        operations or business or properties of the Seller and any
        subsidiaries of the Seller or associated companies, and regardless
        of actual or alleged fault or misconduct of or violations by any
        such entities or persons.

                  (b)  Seller hereby agrees to indemnify, defend and hold
        the Purchaser and effective upon the closing, CBC and any
        Subsidiary (the "Indemnified Group") harmless from any Losses or
        Adverse Consequences arising out of or in connection with or due
        to the breach or inaccuracy of the representation and warranty set
        forth in Section 3.19(k) of this Agreement.  "Adverse
        Consequences" for purposes of this Agreement include without
        limitation the failure of the Purchaser, CBC or any Subsidiary to
        be entitled to calculate the basis of the assets of CBC or any
        Subsidiary for Tax purposes pursuant to Treas. Reg. 1.338(h)(10)-
        l(e)(5). If the receipt or accrual of any indemnification payment
        hereunder is determined not to constitute a reduction of purchase
        price for Federal income tax purposes, Seller shall also pay to
        Purchaser a gross-up Tax Amount which shall be calculated by
        taking into account the hypothetical tax consequences of the
        receipt or accrual of such payment using the maximum rate
        applicable to the Purchaser for the relevant years.

                  (c)  The Seller shall indemnify, defend and hold
        harmless the Indemnified Group from any Losses or Adverse
        Consequences arising out of or in connection with any claim that,
        due to any business arrangement or course of conduct adopted by
        CBC or a Subsidiary pursuant to order of the Bankruptcy Court
        prior to the Closing, or any representations made in connection
        with such arrangement or course of conduct, CBC or the Subsidiary
        is in breach of any obligation to any third party.

                  (d)  Notwithstanding anything to the contrary contained
        in this Agreement, neither the Seller nor CBC shall be liable
        under the indemnification provisions of Article V hereof, or
        otherwise have any liability, for any breach of representation or
        warranty set forth in Article III of this Agreement with respect
        to any matter arising after the date hereof to the extent that
        such breach of warranty or the falsity of the representation upon
        which such liability would be based is expressly disclosed in a
        written notice furnished to the Purchaser at least seven days

                                      - 31 -<PAGE>




        prior to the Closing (as the same may be extended pursuant to
        Subsection (e) below) in a writing designated as updating the
        Schedules attached to the Information Letter (together, in each
        case, with accurate information and disclosure with respect to the
        particular matter involved) and identification of the
        representation and/or warranty concerned; provided, however, that
        any such misrepresentation or breach of warranty or covenant so
        disclosed to the Purchaser after the execution and delivery of
        this Agreement and prior to the Closing shall not affect the right
        of the Purchaser to elect not to close the transactions
        contemplated by this Agreement as provided in Section 7.1 hereof
        retaining all such right as it may have to the Expense
        Reimbursement Fee and the Alternative Transaction Fee as provided
        in the Definitive Authorization (it being understood and agreed
        that if due disclosure is made as provided above of any such
        matter arising after the date hereof and despite such disclosure
        Purchaser elects to close, it shall thereby waive such
        misrepresentation or breach); provided further, however, that the
        provisions set forth in this paragraph shall not affect the right
        of the Purchaser to make the post-closing adjustments referred to
        in Section 2.6 hereof.

                  (e)  The Seller and CBC agree as a separate covenant,
        promptly to notify the Purchaser in writing of any material
        inaccuracy or misrepresentation made by either of them in this
        Agreement (or contained in the Plan of Reorganization or the
        Disclosure Statement) of which either becomes aware prior to the
        Closing Date.  In connection with disclosures pursuant to
        Subsection (d) above, each party may elect not more than once by
        notice to the other parties to extend the Closing Date for a
        period not to exceed seven days.

                  (f)  From and after the Closing, CBC shall cease to have
        any liability for breach of representation or warranty under this
        Agreement, and shall have no liability with respect to any claim
        for indemnification under this Agreement, including such claims
        arising under this Article V.  Moreover, as between the Seller and
        CBC, the Seller shall have no right to claim or receive
        contribution from CBC, nor shall the Seller have any other right
        to assert any other claim against CBC with respect to the
        representations and warranties made by the Seller and CBC in this
        Agreement, or covenants made by CBC pertaining to the period prior
        to the Closing.

                  SECTION 5.3.  Indemnification by the Purchaser. Subject
        to the limits set forth in this Article V, the Purchaser agrees to
        indemnify, defend and hold the Seller and its agents and
        affiliates (collectively, the "Seller's Indemnified Parties")
        harmless from and against any and all Losses that they may suffer,
        sustain, incur or become subject to arising out of, in connection
        with or due to (i) any inaccuracy of any representation or
        warranty or the breach of any warranty, covenant, undertaking or
        other agreement of the Purchaser contained in this Agreement, or
        (ii) any event, condition, conduct, act or omission (not

                                      - 32 -<PAGE>




        constituting a breach of any applicable provision hereof by the
        Seller or Old CBC) that occurs from and after the Closing in
        respect of the Assets, operations or business or properties of the
        Purchaser, or Reorganized CBC or any subsidiaries, and regardless
        of actual or alleged fault or misconduct of or violations by any
        such entities or persons.

                  SECTION 5.4.  Procedure for Indemnification. The
        following procedures shall apply to any claim for indemnification
        under this Agreement:

                  (a)  If a party entitled to be indemnified under this
        Agreement (an "Indemnitee") receives notice of the assertion by an
        unaffiliated third party (a "Third Party") of any claim or of the
        commencement by any Third Party of any action or proceeding (a
        "Third Party Claim") with respect to which another party hereto
        (an "Indemnifying Party") is obligated to provide indemnification
        pursuant to the terms of this Agreement, the Indemnitee shall give
        the Indemnifying Party prompt notice thereof after receiving
        notice of such Third Party Claim.  The notice to the Indemnifying
        Party shall describe the Third Party Claim in reasonable detail
        and shall indicate the amount (estimated if necessary) of the Loss
        that has been or may be sustained by the Indemnitee.  Such notice
        shall be a condition precedent to any liability of the
        Indemnifying Party for any Third Party Claim under the provisions
        for indemnification contained in this Agreement; provided,
        however, that the failure of the Indemnitee to give prompt notice
        to the Indemnifying Party of such Third Party Claim shall
        adversely affect the Indemnitee's rights to indemnification
        hereunder solely to the extent that such failure materially
        prejudices the Indemnifying Party in the defense of such Third
        Party Claim.  Except as otherwise provided herein, the
        Indemnifying Party may elect to defend, at such Indemnifying
        Party's own expense and by such Indemnifying Party's own counsel
        (which shall be reasonably satisfactory to the Indemnitee), any
        Third Party Claim if the Indemnifying Party shall have set forth
        in writing the basis for its obligation to indemnify for the
        liability asserted in such action (together with a reasoned
        statement of any reservations it may make as to such obligation)
        and shall provide such evidence of financial capacity to meet such
        obligations as the Indemnitee may reasonably require; provided,
        however, that the Indemnitee is hereby authorized to file any
        motion, answer or other pleading which it deems necessary or
        appropriate to protect its interests, and provided further that if
        the Indemnifying Party is the Seller or CBC, such Indemnifying
        Party shall cease to have the right to assume the defense (and
        shall permit the Indemnitee to assume any defense previously
        assumed by such Indemnitee) of any and all claims in respect of
        which indemnification may be sought under Section 5.2 if it shall
        appear, in the Purchaser's judgment after consultation with the
        Seller, that actual or reasonably foreseeable claims in respect of
        which such indemnification may be sought may exceed $2,000,000 in
        the aggregate or may affect title, ownership or property in excess
        of such value.  Prior to entering into a final settlement or

                                      - 33 -<PAGE>




        compromise or the entering of any judgment with respect to such a
        settlement or compromise with respect to such Third Party Claims,
        the Indemnifying Party shall notify the Indemnitee and shall
        obtain the Indemnitee's consent to such settlement, compromise or
        entry of judgment if such settlement, compromise or entry would
        result in any cost to the Indemnitee or (A) any action which could
        reasonably be expected to adversely affect (i) the business,
        financial condition or results of operations of the Indemnitee or
        (ii) the Indemnitee's method of doing business, or (B) the
        imposition of injunctive or other equitable relief upon the
        Indemnitee.  If the Indemnifying Party elects to compromise or
        defend such Third Patty Claim, it shall, within the earlier of 30
        days after receiving notice of the Third Party Claim or ten days
        prior to the date upon which an answer is required to be filed
        with respect to such Third Party Claim (but in no event earlier
        than the date on which the Indemnifying Party receives actual
        notice of the Third Party Claim), notify the Indemnitee of its
        intent to do so, and the Indemnitee shall cooperate, in the
        compromise of, or defense against, such Third Party Claim and the
        Indemnitee shall make available (at reasonable times so as not to
        materially interfere with Indemnitee's business and operations) to
        the Indemnifying Party any personnel or any books, records or
        other documents within its control that are reasonably necessary
        or appropriate for such defense, subject to the receipt of
        appropriate confidentiality agreements, and the Indemnifying Party
        shall reimburse the Indemnitee for all its actual reasonable out-
        of-pocket expenses in connection therewith.  If the Indemnifying
        Party elects not to compromise or defend against the Third Party
        Claim, or fails to notify the Indemnitee of its election as herein
        provided, or otherwise abandons the defense of such Third Party
        Claim, (i) the Indemnitee may pay (without prejudice of any of its
        rights as against the Indemnifying Party), compromise or defend
        such Third Party Claim and (ii) the costs and expenses of the
        Indemnitee incurred in connection therewith shall be indemnifiable
        by the Indemnifying Party pursuant to the terms of this Agreement;
        provided, however, that the Indemnitee shall have no obligation to
        compromise or defend against such Third Party Claim.

                  (b)  If the Indemnitee shall reasonably conclude that
        its interests in such action are materially different from those
        of the Indemnifying Party or that it may have defenses that are
        different from or in addition to those available to the
        Indemnifying Party, the Indemnitee may use separate counsel to
        assert such defense and otherwise participate in the defense of
        such action.  If the Indemnifying Party shall assume the defense
        with counsel satisfactory to the Indemnitee, the Indemnifying
        Party shall not be liable for any legal expenses (other than
        investigation expenses) subsequently incurred by the Indemnitee,
        unless the Indemnitee shall have employed separate counsel in
        accordance with the preceding sentence.

                  (c)  The Indemnitee shall be entitled to receive from
        the Indemnifying Party interest at an adjusted rate per annum
        equal to the prime rate quoted in the Wall Street Journal plus one

                                      - 34 -<PAGE>




        percent (calculated on a daily basis based on a year of 365 days
        for the actual days elapsed) on indemnifiable Losses hereunder.
        Such interest shall accrue from the date of the payment by the
        Indemnitee of the amount to be indemnified to the date on which
        the indemnity is paid by the Indemnifying Party.

                  SECTION 5.5.  Production of Witnesses.  Following the
        Closing, each party shall use all reasonable efforts to make
        available to the other party, upon written request, at reasonable
        time and locations its employees and agents as witnesses to the
        extent that any such person may be reasonably required in
        connection with any legal, administrative or other proceedings in
        which the requesting party may from time to time be involved, and
        the requesting party shall reimburse the other party for all out-
        of-pocket expenses reasonably incurred in connection therewith.


                                    ARTICLE VI

                                     COVENANTS

                  SECTION 6.1.  Access and Information.  (a) The Seller
        shall, and shall cause CBC to, permit the Purchaser and its
        agents, advisors and representatives after the date of execution
        of this Agreement to have reasonable access, during regular
        business hours and upon reasonable advance notice, to the
        properties, books and records (including due diligence materials),
        and officers, employees and consultants of CBC, and shall furnish,
        or cause to be furnished, to the Purchaser and its debt and equity
        financing sources and their respective agents, advisors and
        representatives any financial and operating data, including
        without limitation tax returns and information and accountants'
        work papers, and other information that is available with respect
        to the business and properties of CBC and the Subsidiaries,
        including, but not limited to such periodic financial and
        operating statements, as the Purchaser shall from time to time
        reasonably request.  The Purchaser may, with the prior written
        consent of CBC, contact certain customers of and suppliers to CBC.
        A transition team shall be organized by the parties, and the
        representatives whom Purchaser may from time to time name to such
        team shall, in consultation with the representatives of Seller and
        CBC on such team and with appropriate advance notice have such
        ongoing access as Purchaser may reasonably request to all business
        operations of the Rockville Facility in order to inspect, monitor,
        observe and report to Purchaser as to the status of those
        operations and to permit Purchaser to consult with Seller and CBC
        as to maintenance of such operations in good condition and order.

                  (b)  All information provided or obtained pursuant to
        clause (a) above shall be held by the Purchaser and Purchaser
        shall cause all those to whom Purchaser distributes such
        information to hold such information in accordance with and
        subject to the terms of the Confidentiality Agreement, dated May


                                      - 35 -<PAGE>




        3, 1995, between the Purchaser and CBC (the "Confidentiality
        Agreement").

                  SECTION 6.2.  Registrations, Filings and Consents. The
        Seller will, and will cause CBC to, and the Purchaser will
        cooperate and use their respective reasonable best efforts to make
        all registrations, filings and applications, to give all notices
        and to obtain any governmental or other consents, transfers,
        approvals, orders, qualifications and waivers necessary or
        desirable for the consummation of the transactions contemplated
        hereby.

                  SECTION 6.3.  Conduct of Business.  Prior to the
        Closing, and except as otherwise contemplated by this Agreement or
        consented to or approved by the Purchaser, the Seller agrees to
        cause CBC to:

                  (a)  operate the Diagnostics Business of CBC and the
        Subsidiaries and manage the Assets in the ordinary and usual
        course consistent with past practices and use reasonable efforts
        to preserve its properties, business and relationships with
        suppliers and customers;

                  (b)  cooperate with the Purchaser in attempting to
        preserve for the Purchaser the benefit of CBC's previous business
        relationships with suppliers and customers of CBC; provided,
        however, that this Section 6.3(b) shall not be deemed to require
        CBC to pay any sums or to take any action inconsistent with CBC's
        prior practice;

                  (c)  use all reasonable efforts to maintain in inventory
        quantities of raw materials, component parts, work in process,
        finished goods and other materials and supplies sufficient to
        allow CBC to continue to operate the Diagnostic Business after the
        Closing Date, free from any shortage of such items; and

                  (d)  refrain from taking any of the actions specified in
        Section 3.8 hereof.

                  SECTION 6.4.  Notices and Consents.  The Seller will
        cause CBC to give any notices to third parties, and will cause CBC
        to use its reasonable efforts to obtain any third-party consents,
        that are necessary to the consummation of the transactions
        contemplated herein or are reasonably requested by the Purchaser,
        including those consents set forth on Schedule 6.4.

                  SECTION 6.5.  Fulfillment of Conditions.  Each of the
        parties hereto shall use all reasonable efforts to fulfill or
        obtain the fulfillment of the conditions to Closing, including,
        without limitation, the execution and delivery of all agreements
        or other documents contemplated hereunder to be so executed and
        delivered.



                                      - 36 -<PAGE>




                  SECTION 6.6.  Retention of Books and Records.  The
        books, records and documents pertaining to CBC in existence at the
        date hereof shall be duly retained in accordance with CBC's
        records retention policy and at the Closing all such books,
        records, records and documents as pertain to the Diagnostics
        Business or the Assets or are reasonably requested by Purchaser as
        required for conduct of the business of Reorganized CBC shall be
        retained by it at the Rockville Facility, at the Worcester
        Facility of Old CBC (on a temporary basis up to 90 days with
        access by CBC assured during office hours until removal by CBC) or
        at such other location as Purchaser may designate, or shall be
        transferred to Seller subject to separate agreement in writing by
        Seller and Purchaser.  With respect to such of the aforesaid
        books, records and documents which shall be in the possession of
        Seller or Reorganized CBC from and after the Closing, each
        covenants that it shall retain in existence the same and make the
        same available after the Closing Date for inspection and copying
        by the other or its agents at such party's request and expense,
        upon reasonable notice.  No such books, records or documents shall
        be destroyed by the party prior to the sixth anniversary of the
        Closing Date nor shall any such documents be destroyed at any time
        without prior written notice to the other parties hereto in
        writing and giving such parties a reasonable opportunity to obtain
        possession thereof.

                  SECTION 6.7.  Further Assurances.  At any time after the
        Closing Date, the Seller and the Purchaser shall, and the
        Purchaser shall cause CBC to, promptly execute, acknowledge and
        deliver any other assurances or documents reasonably requested by
        the Purchaser or the Seller, as the case may be, and necessary for
        the Purchaser or the Seller, as the case may be, to satisfy their
        respective obligations hereunder.

                  SECTION 6.8.  Hart-Scott-Rodino.  Each party shall file
        with the Federal Trade Commission and the Antitrust Division of
        the United States Department of Justice the notification and
        report form (the "Report") required, if any, under the Hart-Scott-
        Rodino Antitrust Improvements Act of 1976, as amended (the "HSR
        Act") with respect to the sale and purchase of the Shares.  If the
        Purchaser concludes the HSR Act is applicable, it shall so notify
        CBC and each party hereby covenants to prepare and file the Report
        required to be filed by it no later than the tenth business day
        following such notification by Purchaser, to cooperate with the
        other party to the extent necessary to assist the other party in
        the preparation of its Report, to request early termination of the
        waiting period required by the HSR Act and, if requested, to
        promptly amend or furnish additional information thereunder.  Any
        applicable fees will be shared equally by the Seller and the
        Purchaser.

                  SECTION 6.9.  Subsequent Financial Statements and
        General Ledger.  The Seller and CBC shall prepare and deliver to
        the Purchaser for its review the following financial information
        for the following periods (the "Subsequent Financial Statements"),

                                      - 37 -<PAGE>




        the financial statements to be audited where indicated and the
        financial information to pertain to the business and operations of
        only the Rockville Facility where indicated below.

             12 months consolidated financial statements ended
             December 31, 1995 (audited);

             An income statement and list of assets for the 12 months
             ended December 31, 1995 (Rockville Division);

             Monthly statements of revenue for each month subsequent to
             March, 1996 (Rockville Division);

             Monthly statements of income and expense and list of assets
             for each month subsequent to March 1996 (Rockville Division);

             Quarterly income statements and list of assets for each
             quarterly period subsequent to the period ended December 31,
             1995 (Rockville Division);

             Quarterly financial statements for each quarterly period
             subsequent to the period ended December 31, 1995
             (Consolidated).

        Such financial information shall be delivered to the Purchaser,
        (i) in the case of audited year-end financial statements, within
        93 days after the end of the fiscal year, (ii) in the case of
        quarterly financial statements, within 47 days after the end of
        the fiscal quarter and (iii) in the case of monthly statements of
        revenue within 14 days after the end of the month; (iv) in the
        case of monthly statements of income and expense and list of
        assets within 21 days after the end of the month; and (v) in the
        case of quarterly income statements and list of assets (Rockville
        Division) within 30 days after the end of the quarter.  The Seller
        and CBC shall also deliver to Purchaser promptly upon request such
        draft financial statements as have been prepared to the date of
        any such request with respect to any such period (or other period
        as may be covered by any such draft financial statements).

                  The Seller and CBC shall also deliver to the Purchaser
        CBC's general ledger no later than the day prior to the Closing
        Date which shall reflect that CBC has processed and posted all
        ordinary course transactions and accrued appropriate amounts for
        payroll through the day prior to the Closing Date ("Closing Date
        General Ledger") all business of CBC being suspended from the last
        such entry in the General Ledger up to and through the Closing.

                  SECTION 6.10.  Other Transactions.  Except as provided
        in this Agreement and in the Order, neither CBC nor the Seller
        shall sell or transfer, or agree to sell or transfer, or enter
        into any negotiations to sell or transfer, any of the Shares or
        any interest in the Shares and shall keep the Shares free and
        clear of all liens, charges and encumbrances and voting
        agreements, commitments, agreements, understandings and

                                      - 38 -<PAGE>




        arrangements of every kind except as may be set forth in the Plan
        of Reorganization until the earlier of the Closing or termination
        of this Agreement.

                  SECTION 6.11.  Employees and Employee Benefits.  (a) The
        Purchaser agrees that, until six months after the Closing it shall
        use reasonable efforts to, and shall cause CBC to use reasonable
        efforts to, continue to retain the employees at the Rockville
        Facility, and to provide three months' notice of any termination,
        subject, in each case, to any exceptions as circumstances may
        require.

                  (b)  Prior to the transfer of the Shares hereunder, the
        Seller shall offer employment to each of those employees regularly
        based at the Worcester Facility as it may wish to engage and to
        such other identified employees as it may solicit with the written
        consent of Purchaser, on terms no less favorable to each such
        employee than those terms currently in effect, and the employment
        of such employees by CBC shall cease prior to the Closing.  At the
        time of such termination, such terminated former employees will
        cease to be active under any employee benefit plan, agreement,
        commitment, practice or arrangement of any type which is
        maintained or sponsored by CBC (including any plan subject to
        ERISA), and the Seller will be responsible for all benefits, if
        any, otherwise payable in accordance with the terms of such plans,
        agreements, commitments, practices or arrangements with respect to
        events occurring or services provided before the Closing Date.
        Neither CBC nor the Purchaser shall have any responsibility for
        any employee benefits for former employees of CBC employed by the
        Seller with respect to events occurring or services provided on or
        after the Closing Date, and the Seller shall assume, and indemnify
        and hold harmless the Purchaser, CBC and their affiliates from and
        against, any and all Losses with respect to such benefits.  The
        Seller shall have no responsibility for any employee benefits for
        employees that continue to be employed by CBC with respect to
        events occurring or services provided on or after the Closing
        Date, and CBC and the Purchaser shall assume, and indemnify and
        hold harmless the Seller from and against, any and all Losses with
        respect to such benefits.

                  (c)  Prior to Closing, CBC shall establish in such
        manner as shall be reasonably directed by Purchaser a tax-
        qualified individual account plan (the "CBC's 401(k) Plan"), which
        plan shall be substantially similar to the Cambridge Biotech
        Corporation 401(k) Savings Plan (the "Cambridge 401(k) Plan") and
        which shall cover employees that continue to be employed by CBC on
        and after the Closing Date (the "CBC Participants").  On or before
        Closing, Seller shall cause in such manner as shall be reasonably
        directed by Purchaser the trustee of the Cambridge 401(k) Plan to
        transfer assets equal in value to the accounts of CBC's
        Participants in the Cambridge 401(k) Plan to the trustee under the
        trust agreement forming a part of CBC's 401(k) Plan.  Immediately
        after such transfer, (i) each participant's account balance in
        CBC's 401(k) Plan or the Cambridge 401(k) Plan, as the case may

                                      - 39 -<PAGE>




        be, shall equal the account balance of such participant in
        Cambridge 401(k) Plan immediately prior to such transfer, (ii) the
        value of the assets in the CBC's 401(k) Plan shall equal the sum
        of the account balances for all participants in that plan and
        (iii) the value of the Assets in the Cambridge 401(k) Plan shall
        equal the sum of account balances for all participants in that
        Plan.  Seller shall cause to be made any and all filings with the
        submissions to the appropriate governmental authorities required
        to be made in connection with such transfer.  Seller shall on the
        Closing Date assume the Cambridge 401(k) Plan in its entirety,
        including any and all obligations and operations on and after the
        Closing Date and shall indemnify and hold harmless the Purchaser,
        CBC and their affiliates from and against, all Losses with respect
        to the operation or obligations of the Cambridge 401(k) Plan with
        respect to events occurring or services provided prior to the
        Closing Date.  Each party shall bear its own expenses, including
        expenses of counsel, in connection with the transactions set forth
        in this paragraph.  Prior to the transfer of assets from the
        Cambridge 401(k) Plan to CBC's 401(k) Plan, Seller shall conform
        the Plan document to reflect the amendment of the Cambridge 401(k)
        Plan to cease matching contributions effective as of July 7, 1994.

                  (d)  The Seller shall be responsible for providing, or
        causing CBC to provide, all notices required to be given to such
        employees to be terminated by CBC under the Worker Adjustment and
        Retraining Act of 1988, as amended, and shall indemnify and hold
        harmless the Purchaser and CBC from and after the Closing in
        respect of any Losses attributable to failure to give any such
        notices that may have been required to be given prior to the
        Closing Date.

                  (e)  Seller shall deliver to Purchaser prior to Closing,
        copies of IRS Form 5500s for the 1991 through 1994 plan years for
        each Plan (as defined in Section 3.16) which is not exempt from
        the IRS Form 5500 reporting requirements.  Each such IRS Form 5500
        shall be complete and accurate in material respects.  Seller shall
        also deliver to Purchaser prior to Closing evidence that each such
        IRS Form 5500 has been filed with the appropriate government
        agency.

                  (f)  In connection with Seller's covenants under Section
        6.11(e), prior to Closing, Seller shall have a reputable
        accounting firm perform an audit and produce an audit report, as
        required under Section 103(a)(3) of ERISA, covering the 1995, 1994
        and 1993 plan years of the Cambridge 401(k) Plan.  The audit
        report shall be submitted to the appropriate government agencies
        prior to Closing, concurrently with IRS Form 5500s for the 1994
        and 1993 plan years of the Cambridge 401(k) Plan.  Each such IRS
        Form 5500 shall reflect the audit report and the accountant's
        opinion contained therein, and shall contain such information so
        that it is complete and accurate in material respects.  Seller
        shall not have satisfied its covenant to have a reputable
        accounting firm produce an audit report if the accountant's
        opinion contained in the audit report is other than "unqualified"

                                      - 40 -<PAGE>




        (within the meaning of Item 26(b)(1) of 1994 IRS Form 5500) for
        the entire period covered by the audit report; except, however,
        that Seller shall have satisfied such covenant if the accountant's
        opinion is other than "unqualified" and any liabilities resulting
        from such opinion being other than "unqualified" are disposed of
        to Purchaser's reasonable satisfaction by an order issued pursuant
        to Section 6.11(g).

                  (g)  Prior to Closing, Seller shall obtain orders of the
        Bankruptcy Court (i) approving the transfer of assets described in
        Section 6.11(c) and (ii) declaring any and all penalties, taxes or
        other Losses arising out of or in connection with the IRS Form
        5500s described in Section 6.11(e) ("Plan Penalties") to be, as
        the case may be, paid, discharged, or zero in amount or otherwise
        determining in terms reasonably satisfactory to Purchaser that
        Reorganized CBC shall be free and clear of all Plan Penalties.
        Such orders shall direct that they be furnished to the Internal
        Revenue Service and the Department of Labor.  Seller shall
        indemnify and hold harmless the Purchaser, CBC and their
        affiliates from and against all penalties, taxes or other Losses
        described herein.  In this regard, Reorganized CBC shall also be
        protected by the order of the Bankruptcy Court referred to in
        Section 6.12 which shall provide in general terms or otherwise to
        the reasonable satisfaction of the Purchaser that, except as
        otherwise provided herein, Reorganized CBC shall be free and clear
        of all claims arising out of or in connection with conduct or
        obligations of CBC and Seller prior to the Closing including,
        without limitation, such claims relating to the Benefits Plans and
        that all such claims shall be discharged or shall attach to Seller
        as of the Closing.

                  SECTION 6.12.  Certain Matters.  (a) CBC shall seek
        orders of the Bankruptcy Court pursuant to such procedure and upon
        such prior notice and disclosure to interested parties as
        Purchaser shall reasonably consider necessary to assure the
        binding effect of such orders upon such parties, (1) establishing
        a bar date for the filing of any and all claims arising after the
        commencement of CBC's Bankruptcy Case with respect to all
        executory contracts, licenses, unexpired leases and other
        agreements included in the Assets or to be assumed by Reorganized
        CBC under the Plan of Reorganization; (2) providing that, upon
        confirmation of such Plan, the Assets shall vest in CBC free and
        clear of all claims and interests of creditors and equity security
        holders, except as may be otherwise provided in this Agreement;
        that Seller, not CBC, shall be responsible for payment of all
        claims of the kind described in Section 503(b) of the Bankruptcy
        Code; (3) approving CBC's assumption of all executory contracts
        and unexpired leases included in the Assets and finding and
        concluding that each of such executory contracts and unexpired
        leases is free of any default, except that if any such default(s)
        shall have occurred, the same shall have been duly cured or
        adequate assurance of prompt cure shall have been provided through
        arrangements duly approved by the Bankruptcy Court and to take
        effect not later than concurrently with the consummation of the

                                      - 41 -<PAGE>




        Plan of Reorganization, and in consequence of such absence of
        default, cure or adequate assurance of prompt cure, each such
        contract or lease shall be in full force and effect; (4) barring
        and enjoining all interested parties from asserting by way of
        litigation before any tribunal any claim against CBC or any
        Subsidiary that is discharged under the Plan or that the Plan
        provides is to be the responsibility of Seller, not CBC, including
        any claim that any contractual arrangement, agreement, or course
        of dealing adopted by the Debtor pursuant to or in implementation
        of order of the Bankruptcy Court in the course of the Bankruptcy
        Case, constitutes or will constitute after consummation of the
        Plan a breach of any executory contract constituting a part of the
        Assets.

                  (b)  Seller shall cause CBC in the course of the
        bankruptcy proceedings, to reject under Section 365 of the
        Bankruptcy Code the Development/Supply Agreement dated June 29,
        1992, between Syva Company ("Syva") and CBC, and all exhibits and
        schedules thereto (whether any such exhibit or schedule
        constitutes an independent agreement for purposes of the
        application of such Section 365), except that Seller undertakes
        that it shall cause CBC with approval of the Bankruptcy Court
        validly to assume under such Section 365 the License Agreements
        dated such date between Syva, Syntex (U.S.A.) Inc. and CBC set
        forth in Schedules H and J to such Development/Supply Agreement
        (the "H and J Agreements") and Seller shall indemnify Purchaser
        and Reorganized CBC against any failure to fulfill the undertaking
        as to assumption of the H and J Agreements and if such agreements
        are rejected any rejection damages shall be discharged at or prior
        to the Closing or shall attach to Seller, not Reorganized CBC.

                  (c)  Seller shall cause CBC to assume (i) the License
        from NTIS to Biotech Research Laboratories, Inc. (jointly with
        E.I. du Pont de Nemours and Company) originally dated June 19,
        1984 as the same has been amended from time to time to date, (ii)
        the License from NTIS to CBC dated June 15, 1988, and (iii) the
        License from NTIS to CBC dated February 1, 1989.

                  (d)  As provided in paragraph (b) above, CBC shall
        reject pursuant to the Plan of Reorganization the executory
        contracts with Syva providing for the supply of certain product
        there referred to.  It is understood and agreed between Seller and
        Purchaser, however, that CBC shall be prepared to supply
        Recombigen  HIV-1-EIA and HIV-1/2 EIA to Ortho Diagnostic Systems,
        Inc. ("Ortho") and certain existing direct customers identified on
        Schedule 6.12 and Microtrak HIV-1-EIA and HIV-1/2 EIA to Syva
        during the period commencing at the Closing which may continue
        through December 31, 1996 subject to terms to be agreed and
        provided that Seller shall provide toll manufacturing services to
        Purchaser on satisfactory terms to be agreed.  In connection with
        such supply, CBC shall arrange for use of the trade name
        Recombigen and such name shall remain applicable while inventory
        from such supply remains on hand to December 31, 1997 or a later
        date if CBC so elects.

                                      - 42 -<PAGE>




                  (e)  In order to permit Reorganized CBC to build
        necessary inventories of rp2le, provided that a firm order is
        received from Reorganized CBC on or prior to September 30, 1996
        (or if the Closing occurs subsequent to that date, promptly after
        the Closing provided that Purchaser shall have acted reasonably to
        advise Seller as to the projected needs of Reorganized CBC on or
        prior to September 30), Seller shall manufacture for and deliver
        to CBC such quantity of rp2le in good and merchantable form
        consistent with applicable regulatory requirements for the
        intended use (including applicable outdate requirements which
        shall not be less than two years after December 31, 1997 and at
        least at such purity and quality levels as are consistent with
        past practice of CBC) as CBC may order from 500 milligrams up to 5
        grams at the price of $140 per milligram FOB Seller's facility at
        Worcester, Massachusetts, such delivery to take place in
        accordance with a schedule indicated by Purchaser in its order but
        providing at least 90 days from the date of such order for
        manufacture and delivery.

                  (f)  The Seller will allow the Reorganized CBC to use
        its accounting and financial information software package (the
        "Software") and to access its mainframe computer (the "Mainframe")
        to run the Software until December 31, 1996.  Reorganized CBC or
        Purchaser will pay any out-of-pocket costs incurred by the Seller
        solely by reason of Reorganized CBC's use of the Software or
        access to the Mainframe.  During such period as both the Seller
        and Reorganized CBC are using the Software and/or accessing the
        Mainframe, they shall share on an equal basis any applicable
        licensing or maintenance fees at applicable rates as previously
        disclosed by CBC in writing and for any period when only one party
        is so benefitting it shall bear all such applicable costs.  Seller
        will provide during the transition period between the date hereof
        and the Closing training for two people for two days each in each
        of the accounts payable and customer support areas.  Reorganized
        CBC will engage an independent contractor, at its own expense, to
        construct security measures such as are necessary to separate the
        data relating to the Diagnostics Business from the Seller's data
        and which prevent access by Reorganized CBC to the Seller's data
        or by the Seller to the data relating to the Diagnostics Business.
        The Seller shall not be liable to the Purchaser, Reorganized CBC
        or any third party for any damages or costs incurred as a result
        of Reorganized CBC's use of the Seller's Software or Mainframe,
        except in the case of willful misconduct.

                  SECTION 6.13.  Section 338(h)(10) Election.  (a) The
        Seller will join with the Purchaser in making an election under
        Sections 338(g) and 338(h)(10) of the Code or any similar state or
        local law provision in any state or states as the Purchaser may
        designate or as shall be required, with respect to the sale of the
        Shares to the Purchaser hereunder (collectively the "Section
        338(h)(10) Election").  The Seller and the Purchaser shall jointly
        make an election on Form 8023 or in such other manner as may be
        required by rule or regulation of the Internal Revenue Service
        under Section 338(h)(10) of the Code, concerning the transactions

                                      - 43 -<PAGE>




        contemplated by this Agreement.  The Purchaser shall, with the
        assistance and cooperation of the Seller, prepare all Section
        338(h)(10) forms in accordance with applicable tax laws.

                  (b)  The Seller and the Purchaser will allocate the
        "Modified Aggregate Deemed Sale Price" as computed under Treasury
        Regulations (or similar state or local law provisions) (including
        any portion of the Tax Increment properly treated as consideration
        for the Shares) among CBC's assets for tax purposes in accordance
        with the Purchaser's and Seller's reasonable determination of
        their fair market values (the "Price Allocation"), which Price
        Allocation shall be delivered to the Seller.  The Seller and the
        Purchaser agree to act in accordance with the Price Allocation in
        the preparation, filing and audit of any Tax Return.

                  The Purchaser will have the right, at its expense, to
        defend against and control the disposition of any challenge (a
        "Challenge") by any taxing authority to the allocation of the
        Modified Aggregate Deemed Sales Price referred to in the preceding
        paragraph if the defense of the Challenge can be separated from
        any challenge to, or audit of, other issues in the tax returns of
        the Seller or CBC. If the defense cannot be so separated, the
        Seller will contest the Challenge and use their best efforts to
        cause the reporting positions taken at the Purchaser's direction
        in connection with the above matters to be upheld.  The Seller
        shall consult with the Purchaser concerning all action to be taken
        in such contest, and shall not settle any Challenge without the
        Purchaser's consent, which consent shall not unreasonably be
        withheld by the Purchaser.  The Seller will advise the Purchaser
        promptly upon receipt of any formal or informal notice of a
        Challenge.

                  (c)  without the prior written consent of the Purchaser,
        neither the Seller, CBC nor any Subsidiary shall, to the extent it
        may affect or relate to CBC or any Subsidiary, make any election
        other than the Section 338(h)(10) Election, change any election,
        change an annual tax accounting period, adopt or change any tax
        accounting method, file any amended Return, enter into any closing
        agreement, settle any Tax claim or assessment, surrender any right
        to claim a refund of Taxes, consent to any extension or waiver of
        the limitation period applicable to any Tax claim or assessment,
        take any other action or omit to take any action, if any such
        election, adoption, change, amendment, agreement, settlement,
        surrender, consent or other action or omission would have the
        effect of increasing the Tax liability or decreasing any Tax asset
        of CBC or any Subsidiary.

                  (d)  The Seller shall include CBC and any Subsidiaries
        through the close of business on the Closing Date in those state
        and local tax returns that are filed on a consolidated, combined
        or unitary basis.

                  (e)  The Seller will pay any and all federal, state,
        local or foreign Taxes, including any liability of CBC or any

                                      - 44 -<PAGE>




        Subsidiary for Taxes attributable to the making of the Section
        338(h)(10) Election, and will indemnify the Purchaser, CBC and any
        Subsidiary against any Losses or Adverse Consequences arising out
        of any failure to pay such Tax.

                  SECTION 6.14.  Other Tax Matters.  (a) Tax Periods
        Ending on or Before the Closing Date.  The Purchaser and the
        Seller at the Seller's expense shall jointly prepare or cause to
        be prepared and file or cause to be filed all Tax Returns for CBC
        and any Subsidiary for all periods ending on or prior to the
        Closing Date which are filed after the Closing Date.  Seller shall
        pay to the Purchaser for Taxes of CBC and Subsidiary with respect
        to such periods within fifteen (15) days after demand by the
        Purchaser or CBC and its Subsidiaries of such Taxes.

                  (b)  Tax Periods Beginning Before and Ending After the
        Closing Date.  The Purchaser shall prepare or cause to be prepared
        and file or cause to be filed any Tax Returns of CBC and any
        Subsidiary for Tax periods which begin before the Closing Date and
        end after the Closing Date.  The Seller shall pay to the Purchaser
        within fifteen (15) days after demand by the Purchaser or CBC an
        amount equal to the portion of such Taxes which relates to the
        portion of such Taxable period ending on the Closing Date.  For
        purposes of this Section, in the case of any Taxes that are
        imposed on a periodic basis and are payable for a Taxable period
        that includes (but does not end on) the Closing Date, the portion
        of such Tax which relates to the portion of such Taxable period
        ending on the Closing Date shall (x) in the case of any Taxes
        other than Taxes based upon or related to income or receipts, be
        deemed to be the amount of such Tax for the entire Taxable period
        multiplied by a fraction the numerator of which is the number of
        days in the Taxable period ending on the Closing Date and the
        denominator of which is the number of days in the entire Taxable
        period, and (y) in the case of any Tax based upon or related to
        income or receipts be deemed equal to the amount which would be
        payable if the relevant Taxable period ended on the Closing Date.
        Any credits relating to a Taxable period that begins before and
        ends after the Closing Date shall be taken into account as though
        the relevant Taxable period ending on the Closing Date.  All
        determinations necessary to give effect to the foregoing
        allocations shall be made in a manner consistent with prior
        practice of CBC and its Subsidiaries.

                  (c)  Cooperation on Tax Matters.

                  (i)  The Purchaser, CBC and any Subsidiary and the
             Seller shall cooperate fully, as and to the extent reasonably
             requested by the other party, in connection with the filing
             of Tax Returns pursuant to this Section and any audit,
             litigation or other proceeding with respect to Taxes.  Such
             cooperation shall include the retention and (upon the other
             party's request) the provision of records and information
             which are reasonably relevant to any such audit, litigation
             or other proceeding and making employees available on a

                                      - 45 -<PAGE>




             mutually convenient basis to provide additional information
             and explanation of any material provided hereunder.  CBC and
             any Subsidiary and Seller agree (A) to retain all books and
             records with respect to Tax matters pertinent to CBC and any
             Subsidiary relating to any taxable period beginning before
             the Closing Date until the expiration of the statute of
             limitations (and, to the extent notified by Purchaser or
             Seller, any extensions thereof) of the respective taxable
             periods provided that in the event there is a net operating
             loss incurred in such year, the relevant books and records
             must be retained until the expiration of the statute of
             limitations (and to the extent notified by Purchaser or
             Seller, any extensions thereof) of the year which is the last
             year to which the net operating loss could be carried forward
             as provided by law, and to abide by all record agreements
             entered into with any taxing authority, and (B) to give the
             other party reasonable written notice prior to transferring,
             destroying or discarding any such books and records and, if
             the other party so requests, CBC and any Subsidiary or the
             Seller, as the case may be, shall allow the party to take
             possession of such books and records.

                 (ii)  The Purchaser and the Seller further agree, upon
             request, to use their best efforts to obtain any certificate
             or other document from any governmental authority or any
             other person as may be necessary to mitigate, reduce or
             eliminate any Tax that could be imposed (including, but not
             limited to, with respect to the transactions contemplated
             hereby).

                (iii)  The Purchaser and the Seller further agree, upon
             request, to provide the other party with all information that
             either party may be required to report pursuant to Section
             6043 of the Code and all Treasury Regulations promulgated
             thereunder.

                  (d)  Tax Sharing Agreements.  All tax sharing agreements
        or similar agreements with respect to or involving the Seller, CBC
        and the Subsidiaries shall be terminated as of the Closing Date
        and, after the Closing Date, CBC and its Subsidiaries shall not be
        bound thereby or have any liability thereunder.

                  (e)  Certain Taxes.  All transfer, documentary, sales,
        use, stamp, registration and other such Taxes and fees (including
        any penalties and interest) incurred in connection with this
        Agreement (including any New York State Gains Tax, New York City
        Transfer Tax and any similar tax imposed in other states or
        subdivisions), shall be paid by Seller when due, and Seller will,
        at its own expense, file all necessary Tax Returns and other
        documentation with respect to all such transfer, documentary,
        sales, use, stamp, registration and other Taxes and fees, and, if
        required by applicable law, the Purchaser will, and will cause its
        affiliates to, join in the execution of any such Tax Returns and
        other documentation.

                                      - 46 -<PAGE>




                  SECTION 6.15.  Covenant Not To Compete.  Except as set
        forth on Schedule 6.15, for a period of five years from and after
        the Closing Date, neither the Seller nor any entity in which the
        Seller after the Closing Date holds an equity interest equal to or
        greater than 25% of such entity's outstanding equity will engage
        or be engaged in the retroviral diagnostic business or any other
        line of business in which Reorganized CBC is engaged immediately
        after the Closing.  The Seller acknowledges that a violation on
        its part of this Section 6.15 would cause immeasurable and
        irreparable damage to CBC and the Purchaser, and accordingly
        acknowledges that the Purchaser and CBC shall be entitled to
        injunctive relief for any actual violation of such covenant in
        addition to any remedies it may otherwise have.  If the final
        judgment of a court of competent jurisdiction declares that any
        term or provision of this Section 6.15 is invalid or
        unenforceable, the parties agree that the court making the
        determination of invalidity or unenforceability shall have the
        power to reduce the scope, duration or area of the term or
        provision, to delete specific words or phrases, or to replace any
        invalid or unenforceable term or provision with a term or
        provision that is valid and enforceable and that comes closest to
        expressing the intention of the invalid or unenforceable term or
        provision, and this Agreement shall be enforceable as so modified
        after the expiration of the time within which the judgment may be
        appealed.

                  SECTION 6.16.  Licenses and Sublicense.  (a) Effective
        as of the Closing, CBC hereby grants to the Seller a fully paid-
        up, royalty free, nonexclusive sublicense to make, use and sell
        products and processes in the vaccine, therapeutic and related
        research use fields only under U.S. Patent # 4,734,362 and foreign
        counterparts (protein purification patent) and to make, use and
        sell products in the veterinary diagnostics field of use only
        under U.S. Patent # 4,753,873 and foreign counterparts (peptides
        for the diagnosis of HTLV-III antibodies, their preparation and
        use).  Such licenses shall continue for the term of the applicable
        patent in each country wherein the same has issued or may issue,
        without right to sublicense.

                  (b)  Effective as of the Closing, CBC grants to the
        Seller a nonexclusive sublicense to make, use and sell products or
        processes in the vaccine, therapeutic and related research use
        fields of use only under U.S. Patents 4,725,669 and 5,068,174
        (Harvard gpl20 and p27) and any foreign counterparts subject to
        all applicable limitations on sublicensees under the License
        Agreement dated May 1, 1987 between the President and Fellows of
        Harvard College ("Harvard") and CBC as such agreement is amended
        to and in effect on the date of this Agreement ("Harvard
        License").  Seller and Purchaser agree to consult as to
        renegotiation of the Harvard License in order to accomplish mutual
        objectives and in this connection Purchaser will give due
        consideration to negotiating positions previously taken by CBC
        with Harvard which have been communicated to Purchaser in writing
        and will not unreasonably withhold its consent to those positions

                                      - 47 -<PAGE>




        but Seller shall not cause or permit CBC to agree to, and CBC
        shall not agree to any amendment, alteration or termination of the
        aforesaid Harvard License or any other license, contract,
        agreement or lease constituting a part of the Assets without
        Purchaser's prior written consent.  In connection with the
        negotiations with Harvard, Purchaser will lend support to Seller's
        request for the right to grant sublicenses for therapeutic and
        vaccine uses only and in the event such right is granted Purchaser
        will cause Reorganized CBC to relinquish the right to grant
        sublicenses under the Harvard License (other than sublicenses of
        the invention claimed under U.S. Patent Application Ser. No.
        789,126 ("Green Monkey" patent)) for therapeutic and vaccine uses
        otherwise than to affiliates of Reorganized CBC and without
        authorizing such affiliated sublicensees to grant further
        sublicenses (for this purpose affiliate means any company,
        partnership or other entity controlling, controlled by or under
        common control with Reorganized CBC and control refers to
        possession of half or more of the equity, ownership, or voting
        control or the ability to cause the election or designation of
        half or more of any board, committee or group having the direction
        of the business concerned), any sublicense to such an affiliate to
        cease if affiliate status ceases, provided that Seller shall make
        available without interruption of rights a sublicense of the same
        technology on reasonable terms and conditions no less favorable to
        such former affiliate than those then being currently offered by
        Seller for sublicenses of such technology; notwithstanding the
        foregoing provision as to cessation, any sublicense to Transgene
        S.A. ("Transgene") shall not cease but shall continue in effect
        for the benefit of Transgene and any successor even if Transgene
        or such successor should cease to be a Reorganized CBC affiliate,
        and any sublicense to a Reorganized CBC affiliate controlled by
        Transgene or such successor shall continue in effect so long as
        such affiliate status or such control continues.

                  The term of the sublicense to Seller under the Harvard
        License shall be coextensive with the term of the Harvard License
        and the royalty rate payable to CBC shall be 3% of Seller's net
        sales as defined in the Harvard License or such lesser percentage
        as may be authorized pursuant to a formula applicable under such
        license permitting reduction of royalty in connection with sales
        of products requiring payment of multiple royalties, provided,
        however, that in no case shall the royalty be fixed at a lower
        rate than that necessary to prevent a reduction of the royalty
        rate payable by previous sublicenses of Cambridge under provisions
        assuring them treatment on the same basis as afforded more favored
        licensees.  Purchaser and Seller agree that within a reasonable
        time after the Closing they shall consult together with Harvard
        and the portion of royalties received by CBC to be remitted to
        Harvard shall be determined by agreement between CBC and Harvard.
        Purchaser represents that subject to satisfactory conclusion of
        such discussions it would be prepared to remit as much as the full
        3% royalty rate to Harvard and would have no objection if Harvard
        is prepared to accord Seller, as sublicensee, the right to grant
        further sublicenses within the field of use authorized by the

                                      - 48 -<PAGE>




        sublicense to Seller and on terms permitting a reasonable sharing
        of royalties between Harvard, Seller and CBC.  As an alternative
        arrangement, in the event of failure of the negotiations
        contemplated above, Purchaser will be prepared to cause
        Reorganized CBC to grant sublicenses for nondiagnostic uses only
        to selected customers or co-venturers of Seller on reasonable
        terms and conditions and on a basis assuring Reorganized CBC a
        fair return for its role in such transactions, based on
        administrative compensation as provided in Subsection (d) hereof,
        and subject to the maximum there referred to except that such
        maximum will be subject to renegotiation in good faith if required
        to fully compensate for the administrative burden to CBC.

                  (c)  The Seller acknowledges its familiarity with the
        terms and conditions of the Harvard License and agrees that it
        will abide by all provisions therein applicable to sublicensees
        thereunder, and such provisions are agreed to as if set forth
        herein in full.  Seller as sublicensee shall also comply with all
        such reporting requirements and customary sublicense provisions as
        Purchaser may reasonably request to assure full and timely
        compliance with all obligations under the Harvard License.  The
        Seller indemnifies CBC in full for any liability (including
        attorneys' fees) CBC may incur in connection with Seller's
        exploitation of the rights granted under these sublicenses.

                  (d)  Royalties Collected by CBC or Seller (if Allowed to
        Sublicense) Under the Harvard License.  Royalties Paid by CBC's
        sublicensees under the Harvard License pursuant to sublicense
        agreements entered into prior to the date hereof (as set forth on
        Schedule 6.16(d) "Existing Harvard Sublicenses") shall be
        collected by CBC and such collections ("Collections") shall be
        applied as set forth in this Subsection (d).  As used in this
        subsection, Net Sales means Net Sales as defined in the Harvard
        License; the term "Seller Harvard Net Sales" means, for a given
        calendar year, (i) all net sales on which royalties are payable to
        CBC in respect of Existing Harvard Sublicenses, (ii) all Net Sales
        on which royalties are payable to or for the benefit of Seller in
        respect of any sublicenses of the Harvard License granted
        hereafter, and (iii) all royalties payable by Seller to CBC in
        respect of the sublicense of the Harvard License granted hereby to
        Seller.  As used in this subsection, the term "CBC Harvard Net
        Sales" means, for a given calendar year, (i) all Net Sales on
        which royalties are payable to CBC under sublicenses of the
        Harvard License granted by CBC after the date hereof (other than
        any amounts thereof paid to or for the benefit of Seller), and
        (ii) all Net Sales of CBC on which royalties are payable in
        respect of the Harvard License; provided, however, that the term
        CBC Harvard Net Sales shall in all cases exclude Net Sales of
        Licensed Products as defined in the Harvard License which are
        Licensed Products solely because they are made, used or sold
        pursuant to rights claimed under the Green Monkey patent.  As used
        in this subsection, the term "Harvard Expense" means, for a given
        calendar year, the sum of (i) the amounts (licensing fees, minimum
        royalties) owed by CBC to Harvard with respect to the patents

                                      - 49 -<PAGE>




        licensed by the Harvard License, and (ii) the patent prosecution
        expenses for which CBC is responsible for under Section 7.1 of
        such Harvard License, in both cases excluding from such amounts
        and expenses those related to Green Monkey patent.  For each
        calendar year the percentage that Seller Harvard Net Sales
        constitute in relation to the sum of Seller Harvard Net Sales and
        CBC Harvard Net Sales shall be determined and the same percentage
        of Harvard Expenses for such year ("Seller's Share") shall be paid
        by application of collections made in such year.  A further 1O% of
        such collections shall be retained as an administrative fee, not
        to exceed $25,000 for any year.  The balance of such collections
        shall be payable to Seller.  In the event that Collections are
        insufficient to cover Seller's Share, Seller shall not be required
        to contribute any deficiency.

                  CBC and Seller shall cooperate to achieve the foregoing
        sharing of revenues and expense.  Within sixty days after the end
        of each calendar year, CBC shall remit to Seller any sums due
        Seller with respect to the previous year together with a statement
        of receipts and applicable charges and costs.  In the event that
        Collections are substantially in excess of expectations the
        Discretionary Advance Payment Procedure referred to in subsection
        (e) below shall be applicable.

                  (e)  Royalties Collected by Reorganized CBC under the
        Cottingham License.  Royalties paid by Hoffman-La Roche Ltd. as
        sublicensee pursuant to sublicense agreements dated July 23, 1986
        and August 19, 1986 and by Hoffman-La Roche, Inc. as sublicensee
        pursuant to Sublicense Agreement dated March 29, 1991, all such
        sublicense agreements being under the license agreement dated
        February 2, 1982 between Hugh Cottingham and Angenics Inc., as
        such agreement is amended to, and in effect on, the date of this
        Agreement (the "Cottingham License"), shall be collected by
        Reorganized CBC. With respect to such royalties received in any
        year, Reorganized CBC may retain an administrative fee of 5% (but
        not to exceed $10,000.00), shall pay the licensor his share of
        such royalties (taking into account as a credit against such
        royalties pursuant to the Cottingham License minimum royalties
        previously paid), shall pay patent maintenance expenses required
        by the Cottingham License, and shall remit the balance, if any, to
        Seller.  In the event Reorganized CBC shall derive royalties from
        sublicenses under the Cottingham License other than from Hoffman-
        La Roche, Reorganized CBC shall contribute pro rata to said patent
        maintenance expenses.  Within sixty days after the end of each
        calendar year, Reorganized CBC shall remit to Seller any sums due
        Seller with respect to the previous year together with a statement
        of receipts and applicable charges and costs.  In the event that,
        prior to the end of the year, it shall be clear to Reorganized CBC
        that a balance will be due to Seller, Reorganized CBC shall from
        time to time make a good faith estimate of the portion of such
        balance on hand, and in its reasonable discretion may make
        payments to Seller from such balance on hand in advance of the
        date referred to above ("Discretionary Advance Payment
        Procedure").

                                      - 50 -<PAGE>




                  (f)  Bacula.  Effective as of the Closing, Seller hereby
        grants to CBC and Purchaser a fully paid-up royalty free,
        nonexclusive sublicense to make, use and sell products and
        processes in the diagnostics and research fields only under U.S.
        Patent Application No. 08/029402 Bacula Virus Vectors for
        Expression of Secretory Membrane Based Proteins and foreign
        counterparts, continuations, divisions, continuations in part.
        Seller makes no representations with respect to the technology
        embodied in such application and specifically disclaims all
        warranties thereto.

                  SECTION 6.17.  Certain Discussions.  In addition to
        ongoing discussions concerning contractual relationships of CBC's
        Subsidiary, it is understood that prior to the Closing the
        Purchaser may with the prior written consent of CBC (such consent
        not to be unreasonably withheld) seek to restructure certain
        arrangements with third parties relating to the Diagnostics
        Business in order to achieve optimal business arrangements with
        effect upon or after the Closing, and in the event that any
        agreement for such restructuring is achieved, Seller and CBC shall
        make such disclosure thereof to the Bankruptcy Court with such
        notice to third parties as the Purchaser may reasonably request in
        writing in connection with the assumption of any executory
        contract or unexpired lease constituting a part of the Assets; if
        such request is unreasonable because untimely or otherwise
        inappropriate, and bankruptcy counsel to CBC so advises, Seller
        and CBC may decline to comply with such request and the parties
        shall consult in good faith as to the appropriate course to
        achieve mutual objectives of security of the Assets and success of
        the Plan of Reorganization.

                  SECTION 6.18.  Contract with Ortho Diagnostics.  In
        addition to its obligations under such other provisions hereof as
        may be applicable, Seller specifically covenants that as of the
        Closing, Reorganized CBC shall have no liability for damages to
        Ortho Diagnostics Systems, Inc. ("Ortho") for debts or other
        payables accruing prior to the Closing upon any contract, purchase
        order or other agreement, whether by way of set off against
        amounts falling due from Ortho to CBC or Reorganized CBC or
        otherwise, and Seller indemnifies Reorganized CBC against any such
        claim.  CBC and Seller further agree that during the period from
        the execution hereof to the Closing they shall use best efforts in
        consultation with and as reasonably directed by Purchaser to
        obtain Ortho's agreement to an amendment (the "Amendment") to the
        License Supply and Development Agreement among CBC, Ortho and
        Chiron Corporation dated March 30, 1993 (the "Ortho Agreement"),
        such Amendment to be in form substantially similar to the draft
        dated April 1, 1996 (the "Draft") furnished to the Purchaser (or
        in such other form as is reasonably acceptable to Purchaser and
        CBC) and Seller and CBC represent that they shall, if requested by
        Purchaser, seek to negotiate a reasonable period for supply by CBC
        to Ortho that is longer than that provided in the Draft.  CBC and
        Seller represent to Purchaser that, based on prior discussions
        with Ortho, they believe that the provisions of the Draft with

                                      - 51 -<PAGE>




        respect to distribution and pricing are acceptable to Ortho and
        that the parties have not reached agreement on all other items of
        the Draft including obligations of Ortho to manufacture.  The
        Chief Executive Officer of CBC has been conducting the
        negotiations with Ortho, with respect to the Amendment and has not
        been told by Ortho that Ortho has plans to discontinue
        distribution of the HTLV-I (rp2le enhanced) EIA product or is
        considering such a plan.  It is understood and agreed between
        Purchaser and Seller that such Amendment should at a minimum
        contain supply and pricing provisions at least as favorable to CBC
        as those of the Draft.  In the event that Seller and CBC are
        unable to accomplish the execution of the Amendment, Purchaser and
        Seller shall consult as to strategic and tactical matters with
        respect to assumption, termination or rejection of the Ortho
        Agreement.  If Purchaser in consultation with bankruptcy counsel
        determines that there are reasonable grounds to terminate the
        Agreement and notifies CBC to such effect on or prior to May 15,
        1996 then CBC shall deliver a termination notice to Ortho.
        Purchaser and CBC shall cooperate with respect to any proceedings
        with Ortho respecting assumption, termination or rejection.  CBC
        shall allow Purchaser reasonably to direct the conduct of any
        proceedings including structuring any proceedings in order to
        preserve CBC's right to reject the Agreement provided that such
        proceedings do not interfere with the ability of CBC to have its
        Plan of Reorganization confirmed in a timely manner and provided
        further that Purchaser and/or Reorganized CBC shall be responsible
        for all costs and expenses of the proceedings (other than costs
        incurred in such connection in the Bankruptcy Case that are not
        substantially in excess of those CBC would normally incur in
        connection with actions it might take independently of Purchaser's
        wishes to resolve the matter of the Ortho Agreement), any
        rejection damages if the Agreement is rejected (to the extent that
        CBC as Debtor-In-Possession or Seller would otherwise be required
        to satisfy or make payment in discharge of such rejection damages)
        and shall bear the risk of an unfavorable result of any such
        proceedings as to the Ortho Agreement except as to the liability
        for damages referred to in the first sentence of this section.  In
        the event the Agreement is terminated or rejected Reorganized CBC
        shall benefit from any rights arising or resulting from such
        termination or rejection after the Closing and Annex B shall be
        deemed amended to reflect such occurrence.


                                    ARTICLE VII

                                    CONDITIONS

                  SECTION 7.1.  Condition to the Purchaser's Obligation.
        The obligation of the Purchaser to effect the Closing is also
        subject to the satisfaction or waiver by the Purchaser on or prior
        to the Closing of the following conditions:

                  (a)  The waiting period under the HSR Act, if
        applicable, shall have expired.

                                      - 52 -<PAGE>




                  (b)  The representations and warranties of the Seller
        set forth in Article III of this Agreement shall be true and
        correct in all material respects as of the date of this Agreement
        and (except to the extent such representations and warranties
        speak as of an earlier date) as of the Closing Date as though made
        on and as of the Closing Date.

                  (c)  The Seller shall have performed (or shall have
        caused CBC to perform, as appropriate) in all material respects
        all obligations required to be performed by either the Seller or
        CBC under this Agreement at or prior to the Closing Date,
        including those transactions set forth herein and in the Plan of
        Reorganization.

                  (d)  Since the date hereof, no event or events,
        individually or in the aggregate, having or which could reasonably
        be expected to result in a Material Adverse Effect shall have
        occurred.

                  (e)  All the directors, officers and consultants of CBC
        immediately prior to the Closing Date shall have delivered to CBC
        their respective resignations effective as of the Closing Date.

                  (f)  There shall be no pending or threatened court
        action or proceeding by any federal or state governmental
        authority challenging the consummation of the transaction, nor any
        order issued by the Bankruptcy Court or the United States District
        Court or any other court having jurisdiction in the premises which
        order stays the Order of the Bankruptcy Court confirming the Plan
        of Reorganization or otherwise restrains, enjoins or prevents the
        consummation of the Plan or any action necessary for such
        consummation, and the time to appeal from the order confirming the
        Plan shall have expired with no appeal taken or, if any appeal
        shall have been taken, the same shall have been withdrawn or
        dismissed or the Closing as proposed to be conducted together with
        such other transactions as contemplated by the Plan which have
        been conducted prior to the Closing or would be conducted
        simultaneously therewith would be such as, in the aggregate, to
        constitute substantial consummation of the Plan within the meaning
        of 11 U.S.C.   1101 unless there is reasonable basis to believe
        that despite such substantial consummation such pending appeal
        would not be moot.

                  (g)  The Seller and CBC shall have procured all the
        consents of third parties specified in Schedule 6.4.

                  (h)  The Bankruptcy Court shall have given all such
        approvals as may be required in connection with the transactions
        contemplated hereby, including confirmation of the Plan of
        Reorganization, and the Plan of Reorganization shall have been
        substantially consummated within the meaning of 11 U.S.C.   1101
        concurrently with the consummation of the transactions hereunder.



                                      - 53 -<PAGE>




                  (i)  Aggregate revenues from sales of products
        manufactured in Rockville and Lyme Western Blots for the last
        quarter of calendar year 1995 and the first quarter of calendar
        year 1996 (collectively the "Late Quarters") shall equal at least
        80% of the aggregate revenues from sale of such products during
        the last quarter of calendar year 1994 and the first quarter of
        calendar year 1995 (collectively the "Early Quarters"), and with
        respect to such products, annualized pretax profits for the Late
        Quarters shall equal at least 70% of such pretax profits for the
        Early Quarters. In addition, aggregate revenues from sales of
        products referred to on Schedule 7.1(i) for the period commencing
        at the end of the first quarter of calendar 1996 and ending at the
        end of the month preceding the Closing (the "Measurement Period")
        shall equal at least 80% of the aggregate revenues shown as "Grand
        Total" on the "Rockville 1996 Budget" dated March 22, 1996
        attached hereto as Schedule 7.1(i) for the Measurement Period.

                  (j)  The value of the inventory at the Closing Date as
        reflected on the Closing Date General Ledger shall be not less
        than an amount equal to (A) the value of such inventory as
        reflected in the audited financial statements of CBC as at
        December 31, 1995, minus (B) $1,000,000 and Purchaser shall have
        had reasonably satisfactory opportunity to review the same.

                  (k)  The Purchaser shall be reasonably satisfied that
        CBC has all licenses or rights as are necessary to permit it (A)
        to continue to manufacture and sell HIV-1 Western Blot Tests and
        (B) to continue to use as heretofore its methods for such
        manufacture and for the detection of the pl8 protein of HIV-1, and
        to use the pl8 protein itself, at an overall cost in terms of
        royalties which is no greater than its historical royalty cost
        plus an incremental amount which is either (a) no greater than 3%
        of net sales, or (b) if greater than 3% of net sales, not so great
        as to render production "unprofitable" (on a quantity and resale
        price basis equivalent to that in effect during the first half of
        calendar year 1995)

                  (l)  The Purchaser shall be reasonably satisfied that
        the Judgment issued by the United States Bankruptcy Court on
        September 1, 1995 in the Genetic Systems Litigation has not been
        reversed and counsel to the Purchaser shall not have identified
        (giving the basis therefor) any objective indication that such
        reversal is forthcoming, Seller having disclosed to the Purchaser
        all circumstances related to the course of the Genetic Systems
        Litigation up to the Closing (except that any information sealed
        pursuant to court order or stipulation of confidentiality shall be
        disclosed to counsel for Purchaser who has qualified for
        disclosure under such order or stipulation).

                  (m)  CBC shall have completed to the reasonable
        satisfaction of the Purchaser the arrangements and renegotiations
        and other matters referred to in Section 6.12(b), (c) and (d)
        above.


                                      - 54 -<PAGE>




                  (n)  The Purchaser shall be reasonably satisfied that
        pre-bankruptcy tax liabilities have been calculated and discharged
        in a manner that is not likely to result in the imposition of
        material additional tax, obligations on Reorganized CBC, any
        subsidiary of Reorganized CBC, or the Purchaser, and that the
        Seller has adequately indemnified or otherwise sufficiently
        provided for the possibility of any additional tax obligations.

                  (o)  The Definitive Authorization, including the
        determinations regarding the existing CBC business thereunder,
        shall have become a final order of the Bankruptcy Court.

                  (p)  The Purchaser shall have received not later than 24
        hours prior to the commencement of the proposed Closing in good
        order the Closing Date General Ledger reflecting all transactions
        required to be reflected therein.

                  (q)  The Order of the Bankruptcy Court confirming the
        Plan of Reorganization shall be consistent with that called for by
        Section 6.12(a)(ii) and shall include the following findings of
        fact and conclusions of law with respect to each of the executory
        contracts and unexpired leases included in the Assets, it being a
        material condition that such findings and conclusions be made
        applicable to each such executory contract and lease severally:

                  (i)  each of such executory contracts and unexpired
             leases shall be free of any breach (other than of a kind
             described in Section 365(b)(ii) of the Bankruptcy Code) or
             default, except that if any such breach (other than of a kind
             described in Section 365(b)(ii) of the Bankruptcy Code) or
             default shall have occurred, the same shall have been duly
             cured or adequate assurance of prompt cure shall have been
             provided through arrangements duly approved by the Bankruptcy
             Court and to take effect not later than concurrently with the
             consummation of the Plan of Reorganization, and in
             consequence of such absence of breach or default, cure, or
             assurance of prompt cure, each such contract or lease shall
             be in full force and effect; and

                 (ii)  such executory contracts and unexpired leases
             referred to in clause (i) above are duly assumed by CBC in
             accordance with Section 365(a) of the Bankruptcy Code.

                  (r)  The Bankruptcy Court shall have made such orders as
        called for in Section 6.12(a)(i) and (iii).

                  (s)  The Plan of Reorganization shall have been
        confirmed and the Disclosure Statement shall have been
        disseminated in substantially the forms circulated to the parties
        prior to the date of this Agreement (draft of March 20, 1996),
        with such changes therein as have been approved by the Purchaser
        in writing, such approval not to be unreasonably withheld;
        provided, however, that, upon reasonable prior notice to Purchaser
        but without Purchaser's approval, Seller and CBC may make changes

                                      - 55 -<PAGE>




        to the provisions of the Plan and Disclosure Statement dealing
        with the classification and treatment of claims and interests,
        financing of Seller, the disposition of CBC's assets other than
        the Assets, and matters other than provisions describing
        transactions contemplated by this Agreement, so long as such
        changes neither alter any of the terms or conditions of the
        transactions contemplated by this Agreement, nor have any material
        effect or impact upon such transactions or the rights of Purchaser
        in connection therewith.

                  (t)  The covenants described in Sections 6.11(c)(i),
        (ii) and (iii), 6.11(e), 6.11(f) and 6.11(g) have been satisfied.
        In lieu of satisfaction of any or all of these covenants,
        Purchaser, at its discretion, may accept a reduction in the
        Consideration referred to in Section 2.2; such reduction to be
        evidenced in a separate written agreement.  In addition, Seller
        will certify that neither the Internal Revenue Service nor the
        Department of Labor has announced its intention to audit the
        Benefit Plans or that, if any such intention has been announced,
        any Losses arising in connection with such audit have been
        disposed of to Purchaser's reasonable satisfaction by an order
        issued pursuant to Section 6.11(g) prior to Closing.

                  (u)  The Purchaser shall have received from the Seller
        and CBC a certificate to the effect that each of the conditions
        specified above in this Section 7.1 has been satisfied.

                  SECTION 7.2.  Condition to the Seller's Obligation.  The
        obligation of the Seller to effect the Closing is also subject to
        the satisfaction or waiver by the Seller's on or prior to the
        Closing of the following conditions:

                  (a)  The representations and warranties of the Purchaser
        set forth in Article IV of this Agreement shall be true and
        correct in all material respects as of the date of this Agreement
        and (except to the extent such representations and warranties
        speak as of an earlier date) as of the Closing Date as though made
        on and as of the Closing Date.

                  (b)  All regulatory approvals required to consummate the
        transactions contemplated hereby, if any, including without
        limitation expiration or termination of the waiting period under
        the HSR Act, if applicable, shall have been obtained and shall
        remain in full force and effect.

                  (c)  The Purchaser shall have performed in all material
        respects all obligations required to be performed by it under this
        Agreement at or prior to the Closing Date.

                  (d)  The Bankruptcy Court shall have given all such
        approvals as may be required in connection with the transactions
        contemplated hereby, including confirmation of the Plan of
        Reorganization.


                                      - 56 -<PAGE>




                                   ARTICLE VIII

                                   MISCELLANEOUS

                  SECTION 8.1.  Public Statements.  Neither CBC nor the
        Seller shall make any public announcement or statement with
        respect to the transactions contemplated hereby, this Agreement or
        any related transaction without the prior written approval of the
        Purchaser except for an initial press release by CBC announcing
        the execution of this Agreement in form reasonably acceptable to
        the Purchaser (together with any oral and written recapitulation
        accurately reflecting the content thereof), filings made with the
        SEC and the Bankruptcy Court, and as required by applicable law.
        The Purchaser shall not rake any public announcement or statement
        with respect to the transactions contemplated hereby, this
        Agreement or any related transaction without the prior written
        consent of the Seller, except for an initial press release by the
        Purchaser announcing the execution of this Agreement in form
        reasonably acceptable to the Seller and as required by applicable
        law.  Notwithstanding anything else in this Agreement, the
        Purchaser may announce the purchase of CBC any time after the
        Closing Date and the Seller may announce the same in connection
        with and after consummation of the Plan of Reorganization.

                  SECTION 8.2.  Expenses.  Except as otherwise
        specifically provided herein, the Purchaser shall pay its own fees
        and expenses in connection with the consummation of the proposed
        transactions, including the fees of Lazard Freres & Co. and the
        Seller shall pay the fees and expenses of CBC and the Seller
        incurred in connection with the consummation of the proposed
        transactions, including the fees of Musket Research Associates.
        The Seller represents and warrants to the Purchaser that such
        Seller has not employed any broker or finder or incurred any
        liability for any brokerage fees, commissions or finders' fees in
        connection with the transactions contemplated herein, except for
        fees payable to Musket Research Associates.  The Purchaser
        represents and warrants to the Seller that the Purchaser has not
        employed any broker or finder or incurred any liability for any
        brokerage fees, commissions or finders' fees in connection with
        the transactions contemplated herein.

                  SECTION 8.3.  Assignment; Parties in Interest.  Neither
        party may assign any of its rights under this Agreement without
        the prior written consent of the other party, except that the
        Purchaser may assign its rights under this Agreement to an
        affiliate.  Subject to the preceding sentence, this Agreement will
        be binding upon, inure to the benefit of and be enforceable by the
        parties and their respective heirs, legal representatives,
        successors and permitted assigns.  Nothing contained in this
        Agreement, express or implied, is intended to confer upon any
        person other than the parties hereto any rights or remedies
        hereunder.



                                      - 57 -<PAGE>




                  SECTION 8.4.  Entire Agreement.  This Agreement and the
        Annexes and Schedules and the documents referred to herein or
        delivered pursuant hereto which form a part hereof, including the
        Information Letter, together with the Confidentiality Agreement,
        contain the entire understanding of the parties with respect to
        the subject matter hereof and thereof.  There are no restrictions,
        agreements, promises, warranties, covenants or undertakings other
        than those expressly set forth herein or therein.  This Agreement
        supersedes all prior agreements and understandings between the
        parties with respect to its subject matter.

                  SECTION 8.5.  Notices.  All notices, claims,
        certificates, requests, demands and other communications hereunder
        ("Notices") will be in writing and will be deemed to have been
        duly given if delivered by hand or facsimile transmission
        confirmed in writing or mailed (registered or certified mail,
        postage prepaid, return receipt), as follows:

                  (a)  If to the Purchaser or to CBC after the Closing to:

                       bioMerieux Vitek, Inc.
                       595 Anglum Drive
                       Hazelwood, Missouri 63042-2395
                       Fax:  (314) 731-8700
                       Attention: Philippe A. Archinard, President

                       With copies to:

                       Donovan Leisure Newton & Irvine
                       30 Rockefeller Plaza
                       New York, New York 10112
                       Fax:  (212) 632-3315
                       Attention:  W.J.T. Brown, Esquire

                  (b)  If to the Seller or to CBC prior to the Closing to:

                       Aquila Biopharmaceuticals, Inc.
                       365 Plantation Street
                       Worcester, MA 06105
                       Fax:  (508) 797-4014
                       Attention:  Alison Taunton-Rigby, President

                       With copies to:

                       Bowditch & Dewey
                       311 Main Street
                       Worcester, MA 01608-1552
                       Fax:  (508) 756-7636
                       Attention: Jane V. Hawkes, Esquire

        or to such other address as the person to whom Notice is to be
        given may have previously furnished to the other in writing in the
        manner set forth above.


                                      - 58 -<PAGE>




                  SECTION 8.6.  Governing Law; Consent to Jurisdiction.
        This Agreement will be governed by and construed in accordance
        with the laws of the State of New York without giving effect to
        the principles of conflicts of law thereof.  The parties to this
        Agreement consent to the jurisdiction of the United States
        District Court for the Southern District of New York and of any of
        the courts of competent jurisdiction in the State of New York
        located in New York County in disputes arising under this
        Agreement, waive any objection to venue laid in such courts, and
        consent that service of process or notice in any action, suit or
        proceeding may be served by personal service or sent by registered
        or certified mail with postage prepaid to the parties at the
        addresses set forth in Section 8.5.

                  SECTION 8.7.  Severability of Provisions.  In case any
        one or more of the provisions contained in this Agreement should
        be invalid, illegal or unenforceable in any respect, the validity,
        legality and enforceability of the remaining provisions contained
        herein shall not in any way be affected or impaired thereby.

                  SECTION 8.8.  Counterparts; Headings.  This Agreement
        may be executed simultaneously in several counterparts, each of
        which will be deemed to be an original, but all which together
        will constitute one and the same instrument.  The article and
        section headings contained herein are for reference purposes only
        and will not affect in any way the meaning or interpretation of
        this Agreement.

                  SECTION 8.9.  Remedies.  The parties hereto agree that
        if for any reason any party hereto shall have failed to perform
        its obligations under this Agreement, then any other party hereto
        seeking to enforce this Agreement against such non-performing
        party shall be entitled to specific performance and injunctive and
        other equitable relief, and the parties hereto further agree to
        waive any requirement for the securing or posting of any bond in
        connection with the obtaining of any such injunctive or other
        equitable relief.  This provision is without prejudice to any
        other rights that any party hereto may have against any other
        party hereto for any failure to perform its obligations under this
        Agreement.

                  SECTION 8.10.  Further Assurances.  Subject to the terms
        and conditions herein provided, each of the parties hereto agrees
        to use all reasonable efforts to take, or cause to be taken, all
        action, and to do, or cause to be done, all things necessary,
        proper or advisable under applicable laws and regulations to
        consummate and make effective the transactions contemplated by
        this Agreement. In case at any time after the Closing any further
        action is necessary or desirable to carry out the purposes of this
        Agreement, the Seller or the Purchaser, as the case may be, shall
        take all such necessary action.

                  SECTION 8.11.  Amendment; Waiver.  No amendment or
        waiver of any provision of this Agreement or consent to departure

                                      - 59 -<PAGE>




        therefrom shall be effective unless in writing and signed by the
        Purchaser and the Seller, in the case of an amendment, or by the
        party which is the beneficiary of any such provisions, in the case
        of a waiver or a consent to departure therefrom.


                                    ARTICLE IX

                                    TERMINATION

                  SECTION 9.1.  Termination.  This Agreement may be
        terminated at any time prior to the Closing Date:

                  (a)  by mutual consent of the Purchaser and the Seller,
        set forth in a written instrument;

                  (b)  (i) by the Purchaser in the event that the
        Definitive Authorization has not been obtained on or before May
        17, 1996, or the Plan of Reorganization has not been confirmed by
        the Bankruptcy Court on or before August 16, 1996, or (ii) by
        either party if the transactions hereunder are not consummated by
        October 31, 1996, or (iii) by the Seller in the event that
        appropriate motion with respect to the matters described in clause
        (i) above has been duly made and supported by reasonable efforts
        of the Seller - and CBC and has been denied, and the Seller and
        CBC reasonably determine in consultation with Purchaser that, upon
        renewal, such motions in respect thereof would not be granted by
        the Bankruptcy Court upon any conditions agreeable to Purchaser;

                  (c)  by the Purchaser (provided that the Purchaser is
        not then in material breach of any representation, warranty,
        covenant or any other agreement contained herein) if there shall
        have been a material breach of any representation, warranty,
        covenant or agreement set forth in this Agreement on the part of
        the Seller, which breach is not cured within thirty (30) days
        after written notice thereof is given by the Purchaser, or which
        breach, by its nature, cannot be cured prior to the Closing; and

                  (d)  by the Seller and CBC (provided that the Seller and
        CBC are not then in material breach of any representation,
        warranty, covenant or any other agreement contained herein) if
        there shall have been a material breach of any representation,
        warranty, covenant or agreement set forth in this Agreement on the
        part of the Purchaser, which breach is not cured within thirty
        (30) days after written notice thereof is given by the Seller, or
        which breach, by its nature, cannot be cured prior to the Closing.

                  SECTION 9.2.  Effect of Termination.  In the event of
        termination of this Agreement by either the Purchaser or the
        Seller as provided in Section 9.1, this Agreement shall forthwith
        become void and have no effect, except that (i) Sections 6.1(b),
        6.8, 8.1, 8.21 8.51 8.6, and this Section 9.2 shall survive any
        termination of this Agreement, and (ii) notwithstanding anything
        to the contrary contained in this Agreement, no party shall be

                                      - 60 -<PAGE>




        relieved or released from any liabilities or damages arising out
        of its willful breach of any provision of this Agreement

                  SECTION 9.3.  Amendment.  Subject to compliance with
        applicable law, this Agreement may be amended by the parties
        hereto.  This Agreement may not be amended except by an instrument
        in writing signed on behalf of each of the parties hereto.

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

                                    BIOMERIEUX VITEK, INC.



                                    By:/s/ Philippe Archinard            
                                       Philippe Archinard
                                       President


                                    AQUILA BIOPHARMACEUTICALS, INC.



                                    By:/s/ Alison Taunton-Rigby          
                                       Alison Taunton-Rigby
                                       President


                                    CAMBRIDGE BIOTECH CORPORATION



                                    By:/s/ Alison Taunton-Rigby          
                                       Alison Taunton-Rigby
                                       President



















                                      - 61 -

<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
This scedule contains summary financial information extracted from the
Unaudited, Consolidated Financial Statements and is qualified in its entirety by
reference to such financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               JUN-30-1996
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