UNILAB CORP /DE/
8-K, 1999-05-17
MEDICAL LABORATORIES
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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    Form 8-K

                                 Current Report

                       Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934



Date of Report:   (Date of earliest event reported):  May 10, 1999


                          Unilab Corporation ("Unilab")
             (Exact name of registrant as specified in its charter)



                                    Delaware
                 (State or other jurisdiction of incorporation)


           33-77286                                95-4415490
   (Commission File Number)                      (I.R.S. Employer
                                               Identification Number)


  18448 Oxnard Street, Tarzana, California            91356               
(Address of principal executive offices)            (Zip Code)


Registrant's telephone number, including area code:  (818) 996-7300


- ------------------------------------------------------------------------------
(Former name or former address, if changed since last report)


<PAGE>


Item 2.           Acquisition or disposition of Assets

                  (a)      Acquisition

                  Pursuant to an Asset Purchase Agreement,  dated as of April 5,
1999 (the  "Asset  Purchase  Agreement"),  by and  between  Physicians  Clinical
Laboratory,  Inc. d/b/a Bio-Cypher Laboratories,  a Delaware corporation ("BCL")
and Unilab  Corporation,  a Delaware  corporation  ("Unilab" or the  "Company"),
effective May 10, 1999, the Company has acquired substantially all of the assets
of BCL (the "BCL  Acquisition").  The  purchase  price  for the BCL  Acquisition
consisted of one million  shares of Unilab common stock (the "Share  Issuance"),
approximately  $8.5 million cash, and a $25 million Note (the "Note").  The Note
bears a 7.5% interest rate, and has $10 million annual  principal  payments.  In
addition to the customer  list,  Unilab  acquired  approximately  $12 million of
assets,  the  majority  of which  are trade  accounts  receivable,  and  assumed
liabilities of  approximately  $4 million.  In connection with the Closing,  BCL
repaid its trade  receivables  financing  facility and delivered its receivables
free and clear.

                  The  shares of Unilab  common  issued or  issuable  in the BCL
Acquisition are subject to a Registration  Rights  Agreement,  dated the Closing
Date.  Certain funds  affiliated with Oaktree Capital  Management,  Inc.,  which
owned a majority  of the  outstanding  debt and equity of BCL,  have  guaranteed
certain  obligations  of BCL under the Asset  Purchase  Agreement  (the "Oaktree
Guaranty").

                  The Asset  Purchase  Agreement is attached as Exhibit 2.1, the
Note is attached as Exhibit 2.2, the  Registration  Rights Agreement is attached
as Exhibit 2.3 and the Oaktree  Guaranty is attached as Exhibit  2.4.  Each such
agreement  is   incorporated  by  reference  in  its  entirety  herein  and  the
description of each such Agreement contained herein is qualified in its entirety
by reference to such agreement.

                  (a)      Source of Funds

                  The consideration for the BCL Acquisition consisted of (i) the
Share Issuance,  (ii)  approximately $8.5 million in cash, from cash on hand and
(iii) the Note,  plus the incurrence of certain  monthly  payments to the United
States owed by BCL and assumed by Unilab.  Unilab  intends to make these monthly
payments from cash on hand. Unilab believes its cash flows will be sufficient to
make such payments on a timely basis.

                  (b)      Equipment or Other Physical Property

                  Certain of the assets of BCL  acquired  by the Company
constitute  equipment  or other  physical property.  Such  assets  were used by
BCL in  conjunction  with its  clinical  laboratory  testing  business.  The
Company intends to continue substantially the same use for such acquired assets.


        Item 7.        Financial Statements, Pro Forma Financial Information
                       and Exhibits

                       (c)      Exhibits.

                       2.1      Asset Purchase Agreement
                       2.2      Note
                       2.3      Registration Rights Agreement
                       2.4      Oaktree Guaranty






<PAGE>



                                    SIGNATURE



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

Dated:   May 14, 1999                   UNILAB CORPORATION



                                        By:    /s/   Mark L. Bibi       
                                        Name:  Mark L. Bibi
                                        Title:   Executive Vice President,
                                                 Secretary and General Counsel

<PAGE>





                                INDEX OF EXHIBITS


                                           Exhibits          Page

Asset Purchase Agreement                    2.1

Convertible Note                            2.2

Registration Rights Agreement               2.3

Oaktree Guaranty                            2.4





                            ASSET PURCHASE AGREEMENT


                                   dated as of

                                  April 5, 1999


                                     between



                               UNILAB CORPORATION


                                       and



                      PHYSICIANS CLINICAL LABORATORY, INC.
                          D/B/A BIO-CYPHER LABORATORIES




<PAGE>



                                TABLE OF CONTENTS


                                                                          PAGE

                              ARTICLE 1 DEFINITIONS


SECTION1.01.  Definitions.....................................................1

                           ARTICLE 2 PURCHASE AND SALE


SECTION2.01.  Purchase and Sale...............................................7
SECTION2.02.  Excluded Assets.................................................9
SECTION2.03.  Assumed Liabilities............................................10
SECTION2.04.  Excluded Liabilities...........................................11
SECTION2.05.  Assignment of Contracts and Rights.............................13
SECTION2.06.  Purchase Price; Allocation of Purchase Price...................14
SECTION2.07.  Closing........................................................15
SECTION2.08. Purchase Price Adjustment.......................................15
SECTION2.09.  Remittance Obligation..........................................15
SECTION2.10.  Prorations and Reimbursements; Security and Utility Deposits...15
SECTION2.11.  Patient Refunds................................................16
SECTION2.12.  Second Cash Payment............................................17
SECTION2.13.  Adjustment Disputes............................................17
SECTION2.14.  Transition Leases..............................................17
SECTION2.15.  Payments in Cash...............................................18

               ARTICLE 3 REPRESENTATIONS AND WARRANTIES OF SELLER


SECTION3.01.  Corporate Existence and Power..................................18
SECTION3.02.  Corporate Authorization........................................18
SECTION3.03.  Governmental Authorization.....................................19
SECTION3.04.  Noncontravention...............................................19
SECTION3.05.  Material Consents..............................................19
SECTION3.06.  Financial Statements...........................................19
SECTION3.07.  Absence of Certain Changes.....................................20
SECTION3.08.  No Undisclosed Material Liabilities............................21
SECTION3.09.  Material Contracts.............................................22
SECTION3.10.  Litigation.....................................................23
SECTION3.11.  Compliance with Laws and Court Orders..........................23
SECTION3.12.  Properties.....................................................23
SECTION3.13.  Sufficiency of and Title to the Purchased Assets...............24
SECTION3.14.  Intellectual Property..........................................25
SECTION3.15.  Insurance Coverage.............................................25
SECTION3.16.  Permits........................................................26
SECTION3.17.  Receivables....................................................26
SECTION3.18.  Selling Documents..............................................26
SECTION3.19.  Finders'Fees...................................................26
SECTION3.20.  Employees......................................................27
SECTION3.21.  Environmental Compliance.......................................27
SECTION3.22.  Investment Representations.....................................28
SECTION3.23.  Subsidiary.....................................................30

                ARTICLE 4 REPRESENTATIONS AND WARRANTIES OF BUYER


SECTION4.01.  Corporate Existence and Power..................................31
SECTION4.02.  Corporate Authorization........................................31
SECTION4.03.  Governmental Authorization.....................................31
SECTION4.04.  Noncontravention...............................................32
SECTION4.05.  Consents.......................................................32
SECTION4.06.  Financing......................................................32
SECTION4.07.  Litigation.....................................................32
SECTION4.08.  Finders'Fees...................................................32
SECTION4.09.  Issuance of Consideration Shares and Consideration Note........32
SECTION4.10.  SEC Documents; Financial Statements; Disclosures...............33
SECTION4.11.  No Integrated Offering.........................................34
SECTION4.12.  Capitalization.................................................34
SECTION4.13.  Absence of Certain Changes.....................................34
SECTION4.14.  Title..........................................................34
SECTION4.15.  Insurance......................................................35
SECTION4.16.  Permits........................................................35
SECTION4.17.  Compliance with Laws and Court Orders..........................35
SECTION4.18.  Patient Refund Policy..........................................35

                          ARTICLE 5 COVENANTS OF SELLER


SECTION5.01.  Conduct of the Business........................................35
SECTION5.02.  Access to Information; Confidentiality.........................36
SECTION5.03.  Permits........................................................37
SECTION5.04.  Notices of Certain Events......................................37
SECTION5.05.  No Shopping or Disclosure......................................37
SECTION5.06.  Tail Insurance.................................................38
SECTION5.07.  Customer List..................................................38
SECTION5.08.  Audited Financial Statements...................................38
SECTION5.09.  HSR Act........................................................39
SECTION5.10.  Patient Refund Policy..........................................39
SECTION5.11. Resignations....................................................39

                          ARTICLE 6 COVENANTS OF BUYER


SECTION6.01.  Representations and Warranties.................................39
SECTION6.02.  Confidentiality................................................40
SECTION6.03.  Access.........................................................40
SECTION6.04.  Reservation of Shares..........................................40
SECTION6.05.  Financial Information..........................................40
SECTION6.06.  HSR Act........................................................41
SECTION6.07.  Notices of Certain Events......................................41
SECTION6.08.  American Stock Exchange........................................41

                     ARTICLE 7 COVENANTS OF SELLER AND BUYER


SECTION7.01.  Efforts; Further Assurances....................................42
SECTION7.02.  Certain Filings................................................43
SECTION7.03.  Public Announcements...........................................43
SECTION7.04.  No Solicitation of Employees...................................43
SECTION7.05.  No Solicitation of Customers...................................44
SECTION7.06.  Provider Numbers...............................................44
SECTION7.07.  Phlebotomy Locations...........................................44

                              ARTICLE 8 TAX MATTERS


SECTION8.01.  Tax Definitions................................................44
SECTION8.02.  Tax Matters....................................................45
SECTION8.03.  Tax Cooperation; Allocation of Taxes...........................45

                           ARTICLE 9 EMPLOYEE BENEFITS


SECTION9.01.  Employee Benefits Definitions..................................47
SECTION9.02.  ERISA Representations..........................................47
SECTION9.03.  Employees and Offers of Employment.............................48
SECTION9.04.  Seller's Employee Benefit Plans................................49

                        ARTICLE 10 CONDITIONS TO CLOSING


SECTION10.01.  Conditions to Obligations of Buyer and Seller.................50
SECTION10.02.  Conditions to Obligation of Buyer.............................50
SECTION10.03.  Conditions to Obligation of Seller............................52

                      ARTICLE 11 SURVIVAL; INDEMNIFICATION


SECTION11.01.  Survival......................................................53
SECTION11.02.  Indemnification...............................................54
SECTION11.03.  Procedures....................................................54
SECTION11.04.  Limitations...................................................55

                             ARTICLE 12 TERMINATION


SECTION12.01.  Grounds for Termination......................................56
SECTION12.02.  Effect of Termination........................................56

                            ARTICLE 13 MISCELLANEOUS


SECTION13.01.  Notices......................................................57
SECTION13.02.  Amendments and Waivers.......................................58
SECTION13.03.  Expenses.....................................................59
SECTION13.04.  Successors and Assigns.......................................59
SECTION13.05.  Governing Law................................................59
SECTION13.06.  Jurisdiction.................................................59
SECTION13.07.  WAIVER OF JURY TRIAL.........................................59
SECTION13.08.  Counterparts; Third Party Beneficiaries......................60
SECTION13.09.  Entire Agreement.............................................60
SECTION13.10.  Bulk Sales Laws..............................................60
SECTION13.11.  Captions.....................................................60
SECTION13.12.  Schedules and Exhibits.......................................60



<PAGE>


                                    EXHIBITS

Exhibit A         Note
Exhibit B         Oaktree Guaranty
Exhibit C         Registration Rights Agreement


                                    SCHEDULES

Schedule 1.01     Oaktree Funds
Schedule 2.01(j)  Transferred Permits
Schedule 2.02(h)  Excluded Contracts
Schedule 2.02(i)  Excluded Real Property
Schedule 2.02(j)  Excluded Personal Property
Schedule 2.02(k)  Autos
Schedule 2.08     Purchase Price Adjustments
Schedule 2.11     Patient Refund Policy of Buyer
Schedule 2.14     Transition  Leases
Schedule 3.05     Material  Consents
Schedule 3.07     Seller  Changes  Since  Balance  Sheet Date
Schedule 3.08(a)  Undisclosed Liabilities
Schedule 3.08(b)  Settlement  Agreement  Payments
Schedule 3.09(a)  Material  Contracts
Schedule 3.09(b)  Exceptions to Contracts
Schedule 3.09(c)  Capitated  Managed Care Contracts
Schedule 3.10     Litigation
Schedule 3.11     Legal Violations and Investigations of Seller
Schedule 3.12(a)  Real Property
Schedule 3.12(b)  Personal  Property 
Schedule 3.12(e)  Exceptions  to  Leases
Schedule 3.12(g)(iii) Purchase Money Security Interests
Schedule 3.12(g)(v)   Non-Permitted Liens
Schedule  3.14        Intellectual  Property  Rights
Schedule  3.15    Insurance
Schedule  3.16    Permits
Schedule 3.17     Receivables
Schedule 3.20(a)  Employees
Schedule 3.20(b)  Employee Resignations or Retirement
Schedule 3.21     Environmental Matters
Schedule 3.23     Liens on Subsidiary Shares
Schedule 4.05     Buyer Consents
Schedule 4.10     Buyer SEC Reports
Schedule 4.12     Capitalization of Buyer


<PAGE>


Schedule 4.13     Buyer Changes
Schedule 4.14     Buyer Exceptions to Title
Schedule 4.17     Legal Violations and Investigations of Buyer
Schedule 7.07     Phlebotomy Locations
Schedule 8.02     Taxes
Schedule 9.02(a)  Employee Benefit Plans
Schedule 9.02(c)  Other Employee Benefits


<PAGE>




                            ASSET PURCHASE AGREEMENT


         AGREEMENT dated as of April 5, 1999 by and between Unilab  Corporation,
a Delaware  corporation  ("Buyer") and PHYSICIANS CLINICAL  LABORATORY,  INC., a
Delaware corporation doing business as BIO-CYPHER LABORATORIES ("Seller").

                              W I T N E S S E T H :

         WHEREAS, Seller conducts a business of providing clinical laboratory
testing services (the "Business");

         WHEREAS,   Bio-Cypher   Funding  Corp.,  a  Delaware   corporation  and
wholly-owned  subsidiary of Seller ("Subsidiary")  purchases accounts receivable
from Seller;

         WHEREAS,  prior to or concurrently with the closing of this transaction
Subsidiary will merge with and into Seller;

         WHEREAS,  the  parties  have  agreed  that  on  the  Closing  Date  all
outstanding  loans made pursuant to, and all other amounts  payable  under,  the
Daiwa Loan Agreements (as defined herein) will be paid by Seller;

         WHEREAS,  Buyer desires to purchase  substantially all of the assets of
Seller,  including all of the assets that were owned by  Subsidiary  immediately
prior to the merger into Seller,  to the extent  transferable and Seller desires
to sell such assets to Buyer,  and in connection  therewith  Buyer is willing to
assume  certain  liabilities  of Seller  relating to the Business,  all upon the
terms and subject to the conditions hereinafter set forth;

         The parties hereto agree as follows:



                                    ARTICLE 1

                                   DEFINITIONS

         SECTION 1.1.  Definitions.

          (a) The following terms, as used in this Agreement, have the following
meanings:

         "Active  Employees" means, at any time, all employees of Seller who are
not on leave at such time  pursuant to the terms of one of  Seller's  disability
plans.



<PAGE>


         "Affiliate"  means,  with  respect  to any  Person,  any  other  Person
directly or indirectly controlling,  controlled by, or under common control with
such other Person.

         "Balance  Sheet"  means the  unaudited  consolidated  balance  sheet of
Seller and Subsidiary as of the Balance Sheet Date.

         "Balance Sheet Date" means November 30, 1998.

         "Business Day" means any day except a Saturday,  Sunday or other day on
which commercial banks in the City of New York are authorized by law to close.

         "Buyer Material  Adverse Effect" means a material and adverse effect on
(i)  Buyer's  ability  to  consummate  the  transactions  contemplated  by  this
Agreement,  (ii) Buyer's ability to perform any of its other  obligations  under
this Agreement,  the  Registration  Rights  Agreement,  the Notes or the Oaktree
Guaranty  or (iii) the  business,  financial  condition,  assets or  results  of
operations of Buyer prior to the Closing Date.

         "Buyer  Non-Disclosure  Agreement" means the  Non-Disclosure  Agreement
dated March 17, 1999 among Buyer, Seller and Oaktree.

         "Cash Amount" means (i) $10,575,000,

          (ii) minus the sum of the amount of Payroll  Liabilities (as estimated
in good faith by Buyer and Seller for purposes of the Closing) and $500,000,

          (iii)  either  (A) minus the amount by which the  aggregate  remaining
payment  obligations of Seller under the Settlement  Agreement as of the Closing
Date, as set forth on Schedule 3.08(b), exceed $1,425,000 or (B) plus the amount
by which such payment obligations are less than $1,425,000,

         (iv) minus the sum of the Purchase Price Adjustments.

      "Closing Date" means the date of the Closing.

      "Common Stock" means the common stock, par value $.01 per share, of Buyer.

      "Conversion  Shares"  means the shares of Common  Stock  issuable  upon
conversion of all or a portion of any Note.



<PAGE>


         "Daiwa Loan Agreements" means (i) the Loan and Security Agreement dated
as of September 30, 1997, as amended,  between  Subsidiary and Daiwa  Healthco-2
LLC, (ii) the Depository Agreement dated as of September 30, 1997, among Seller,
Subsidiary,  Daiwa Healthco-2 LLC, and Union Bank of California,  N.A. and (iii)
the  Assignment of  Healthcare  Receivables  Purchase and Transfer  Agreement as
Collateral Security.

         "Employee Liabilities" means any payments, liabilities costs, expenses,
claims,  obligations or commitments for wages or  compensation,  and payments or
liabilities relating to or arising under severance, bonus, retirement,  pension,
insurance, medical, disability, profit-sharing or deferred compensation plans or
agreements,  employee  vacation  or health  benefits,  paid time off,  state and
federal civil rights or employment laws, including,  without limitation, the Age
Discrimination  in Employment Act of 1967,  Title VII of the Civil Rights Act of
1964,  and the Americans  with  Disability  Act of 1991,  any employee  pension,
benefit or welfare plan,  as defined in ERISA,  or any other  severance,  bonus,
stock  option,  stock  appreciation,  stock  purchase,  retirement,   insurance,
pension, profit-sharing,  deferred compensation or other similar plan, agreement
or  arrangement,  including  without  limitation  the Benefit  Arrangements  and
Employee Plans.

         "Environmental  Laws" means any  federal,  state,  local or foreign law
(including,  without  limitation,  common  law),  treaty,  permit,  governmental
restriction,  regulation,  rule, judicial decision,  judgment,  order, decree or
injunction,  or any agreement between Seller or Subsidiary on the one hand and a
Governmental  Authority and/or other third party on the other hand,  whether now
or hereafter in effect, relating to the environment,  human health and safety or
to Hazardous Substances.

         "Environmental  Liabilities"  means any and all liabilities  arising in
connection  with  or in any  way  relating  to  Seller  or  Subsidiary  (or  any
predecessor  of Seller or  Subsidiary  or any prior  owner of all or part of its
business and assets),  any property now or previously owned,  leased or operated
by Seller or  Subsidiary,  the Business (as currently or previously  conducted),
the Purchased  Assets or any activities or operations  occurring or conducted at
the Real Property  (including,  without limitation,  offsite disposal),  whether
accrued, contingent,  absolute, determined,  determinable or otherwise, that (i)
arise under or result from any  Environmental  Law and (ii) result from  actions
occurring or  conditions  existing on or prior to the Closing  Date  (including,
without limitation, any matter disclosed or required to be disclosed in Schedule
3.21).

         "Governmental  Authority"  means  any  court,  any  governmental  body,
department, agency of instrumentality, or any other regulatory or administrative
agency or commission, domestic or foreign.

         "Hazardous  Substances"  means  any  pollutant,  contaminant,  waste or
chemical or any toxic, radioactive,  ignitable corrosive,  reactive or otherwise
hazardous  substance,  waste or  material  or any  substance,  waste or material
having any constituent elements displaying any of the foregoing  characteristics
including, without limitation, petroleum, its derivatives, by-products and other
hydrocarbons,  and any other  substance,  waste or material  regulated under any
Environmental Law.



<PAGE>


         "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act of
1976, as amended.

         "Lien" means,  with respect to any asset, any mortgage,  lien,  pledge,
charge,  security  interest or encumbrance of any kind in respect of such asset.
For the purposes of this Agreement, a Person shall be deemed to own subject to a
Lien any asset  which it has  acquired  or holds  subject to the  interest  of a
vendor or lessor under any conditional  sale  agreement,  capital lease or other
title retention agreement relating to such asset.

         "1933 Act" means the Securities Act of 1933, as amended,  and the rules
and regulations promulgated thereunder.

         "1934 Act" means the Securities  Exchange Act of 1934, as amended,  and
the rules and regulations promulgated thereunder.

         "Note"  means  the  Consideration  Note  substantially  in the  form of
Exhibit A hereto,  and each other Note of Buyer  issuable in respect of interest
on any Note in accordance with the terms thereof.

         "Nu-Tech" means United Diagnostic, Inc., a Delaware corporation
formerly named Nu-Tech Bio-Med, Inc.

         "Oaktree"  means the  funds and  accounts  set forth on  Schedule 1.01
hereto managed by Oaktree Capital Management, LLC.

         "Oaktree  Guaranty"  means the  Guaranty  dated as of the Closing  Date
between Oaktree and Buyer, substantially in the form of Exhibit B hereto.

         "Patient  Refunds"  means monies owed by Seller to patients as a result
of Seller  having been paid prior to the Closing  Date more than it was entitled
to receive for the services provided by Seller,  including  without  limitation,
payments  received  for a  specific  encounter  from  both the  patient  and the
patient's  insurance  company,  and payments  made  incorrectly  by a patient on
multiple invoices for the same encounter.

         "Permits"   means  any  licenses,   permits,   approvals,   franchises,
authorizations, variances, waivers or consents from a Governmental Authority.

         "Person"  means  an  individual,   corporation,   partnership,  limited
liability company, association, trust or other entity or organization, including
a government or political subdivision or an agency or instrumentality thereof.

         "Real  Property"  means the real property leased or subleased by Seller
pursuant to the Leases.



<PAGE>


         "Registration Rights Agreement" means the Registration Rights Agreement
dated as of the Closing Date between Buyer and Seller, substantially in the form
of Exhibit C hereto.

         "Representatives"  means,  with  respect to any Person,  the  officers,
directors,  employees,   representatives,   accountants,  counsel,  consultants,
advisors and agents of such Person.

         "Restricted  Receivables"  means all accounts,  notes,  receivables and
other indebtedness owed to Seller by any Governmental  Authority pursuant to the
Medicare, Medicaid or CHAMPUS programs, or any other receivables the assignment,
transfer or sale of which is prohibited by statute or regulation.

         "Second Cash Payment  Amount" means  $500,000,  (i) minus the amount by
which the actual Payroll  Liabilities (as determined by Buyer and Seller in good
faith 60 days after the Closing)  exceeds the amount of Payroll  Liabilities  as
were  estimated  as of the Closing  Date for  purposes of  calculating  the Cash
Amount,  or (ii) plus the amount by which the  actual  Payroll  Liabilities  (as
determined by Buyer and Seller in good faith 60 days after the Closing) are less
than the amount of Payroll Liabilities as were estimated as of the Closing Date.

         "Securities" means the Consideration Shares, the Notes and the
Conversion Shares.

         "Seller Material Adverse Effect" means a material and adverse effect on
(i) the ability of Seller,  Subsidiary  or any  Shareholder  to  consummate  the
transactions  contemplated by this Agreement or Oaktree's ability to perform its
obligations under the Oaktree Guaranty,  (ii) Seller's ability to use or own the
Purchased  Assets,  taken as a whole,  prior to the  Closing  Date or (iii)  the
business,  financial  condition,  assets or results of  operations of Seller and
Subsidiary, taken as a whole, prior to the Closing Date.

         "Seller  Non-Disclosure  Agreement" means the Non-Disclosure  Agreement
dated November 5, 1998 between Seller and Buyer.

         "Shareholders"  means any  shareholders  of Seller from the date hereof
until the Closing Date, including without limitation Oaktree and Nu-Tech.

         "Shareholder  Contracts"  means  all  contracts,   agreements,  leases,
licenses,  commitments, sales and purchase orders and other arrangements between
and among Seller or Subsidiary and any  Shareholder  or any of their  respective
Affiliates.

          (b) Each of the  following  terms is defined in the Section set forth
opposite such term:


<PAGE>



  Term                                                           Section
  Acquisition Transaction                                        5.05
  Allocation Statement                                           2.06(b)
  Antitrust Division                                             5.09
  Apportioned Obligations                                        8.03(b)
  Assignment and Assumption Agreement                            2.07(b)
  Assumed Liabilities                                            2.03
  Auto                                                           2.14(b)
  Auto Lease                                                     2.14(b)
  Benefit Arrangements                                           9.02(d)
  Business                                                       Recitals
  Buyer DC Plans                                                 9.04(b)(ii)
  Claim                                                          11.03
  Closing                                                        2.07
  Code                                                           8.01
  Consideration Note                                             2.06(a)
  Consideration Shares                                           2.06(a)
  Contracts                                                      2.01(d)
  Corporate Integrity Agreement                                  2.04(i)
  Customers                                                      2.01(l)
  Customer List                                                  2.01(l)
  Damages                                                        11.02(a)
  Employee Plans                                                 9.02(a)
  ERISA                                                          9.01
  ERISA Affiliate                                                9.01
  Excluded Assets                                                2.02
  Excluded Liabilities                                           2.04
  FTC                                                            5.09
  Indemnified Party                                              11.01
  Indemnifying Party                                             11.01
  Intellectual Property Rights                                   2.01(i)
  Leases                                                         2.01(b)
  Material Consents                                              3.05
  Material Contracts                                             3.09(a)
  Multiemployer Plan                                             9.01
  OIG                                                            2.04(i)
  Payoff Letter                                                  10.02(i)
  Payroll Liabilities                                            2.03(e)
  PBGC                                                           9.01
  Permitted Liens                                                3.12(g)(iv)
  Petty Cash                                                     2.01(g)
  Post-Closing Tax Period                                        8.03(b)
  Pre-Closing Tax Period                                         8.01
  Prepaid Expenses                                               2.01(f)
  Purchased Assets                                               2.01
  Purchase Price                                                 2.06(a)
  Purchase Price Adjustment                                      2.08
  Refund Adjustment                                              2.11(c)
  Refund Adjustment Date                                         2.11(c)
  Records                                                        2.01(k)
  Rule 144                                                       3.22(d)
  Seller Savings Plans                                           9.04(b)
  SEC Documents                                                  4.10
  Second Cash Payment Statement                                  2.12
  Settlement Agreement                                           2.03(f)
  Subsidiary                                                     Recitals
  Subsidiary Securities                                          3.23(b)
  Tax                                                            8.01
  Taxing Authority                                               8.01
  Transfer Taxes                                                 8.03(c)
  Transferred Employees                                          9.03(b)
  Transferred Permits                                            2.01(j)
  Transition Lease                                               2.14
  Trustee                                                        3.23(b)
  Underground Storage Tank                                       3.21(a)
  WARN Act                                                       2.03(g)


                                    ARTICLE 2

                                PURCHASE AND SALE

         SECTION 2.1.  Purchase and Sale.  Except as otherwise  provided  below,
upon the terms and subject to the  conditions  of this  Agreement and subject to
Section  2.05,  Buyer agrees to purchase  from Seller and Seller agrees to sell,
convey,   transfer,   assign  and  deliver,  or  cause  to  be  sold,  conveyed,
transferred,  assigned and delivered to Buyer at the Closing,  free and clear of
all Liens, other than Permitted Liens, all of Seller's right, title and interest
in,  to and  under  the  assets,  properties  and  business,  of every  kind and
description,  wherever located, real, personal or mixed, tangible or intangible,
owned, held or used by Seller (including those by way of merger with Subsidiary)
as the same shall exist on the Closing Date (the "Purchased Assets"),  including
without limitation, all right, title and interest of Seller in, to and under:



<PAGE>


                   (a those leases and  subleases  of, and other  interests  in,
         real property  used or held for use in the conduct of the Business,  in
         each case together with  Seller's  interest in any fixtures,  leasehold
         and other  improvements  thereon,  which are listed on Schedule 3.12(a)
         and not listed on Schedule 2.02(i);

                   (b those leases and subleases of personal  property which are
         listed on Schedule 3.12(b) and not listed on Schedule 2.02(j) (together
         with the leases and subleases  included as Purchased Assets pursuant to
         Section  2.01(a),  the "Leases"),  and any other  interests in personal
         property, including machinery,  equipment, furniture, office equipment,
         communications   equipment,   vehicles,   storage   tanks,   spare  and
         replacement parts, fuel and other tangible  property,  which are listed
         on Schedule 3.12(b) and not listed on Schedule 2.02(j);

                   (c    all raw materials, work-in-process, finished goods,
         supplies and other inventories;

                   (d  all  rights  under  and   interests  in  all   contracts,
         agreements,   licenses,   commitments,   sales  and  purchase   orders,
         instruments and clinical testing orders,  including without  limitation
         the  Material  Contracts  (but  excluding  the  Leases  and  the  items
         described in Section  2.02(b) or Section  2.02(g) or listed on Schedule
         2.02(h)) (collectively, the "Contracts");

                   (e  all  accounts,   notes  and  other  receivables  and  any
         indebtedness  owed to  Seller  and any  security  or  other  collateral
         relating  thereto  and  all  proceeds  thereof,   excluding  Restricted
         Receivables but including any proceeds of Restricted Receivables;

                   (f except to the  extent  Seller is  entitled  to  receive or
         retain any such amount  pursuant to Section  2.10,  all rights  arising
         from  advance  payments,   prepaid  expenses,   prepaid  rents,  surety
         accounts,  security and other deposits and credits  (including  without
         limitation,   deposits  and  credits  with  landlords,   utilities  and
         suppliers) (collectively, the "Prepaid Expenses")

                   (g    all petty cash located at the operating facilities of
         the Business ("Petty Cash");

                   (h all rights, claims, credits, causes of action or rights of
         set-off  against  third  parties  relating  to  the  Purchased  Assets,
         including, without limitation, unliquidated rights under manufacturers'
         and  vendors  warranties,  except to the extent  such  rights,  claims,
         credits,  causes of action or rights of set-off relate to  liabilities,
         obligations  and  commitments  that are  included  within the  Excluded
         Liabilities;



<PAGE>


                   (i all patents,  copyrights,  trademarks,  trade names,  mask
         works, servicemarks,  service names, technology,  know-how,  processes,
         trade  secrets,  inventions,  proprietary  data,  licenses from a third
         party  other than a  Governmental  Authority,  formulae,  research  and
         development  data,  computer  software  programs  and other  intangible
         property and any  applications  for the same, in each case used or held
         for use in the Business  ("Intellectual  Property  Rights"),  including
         without limitation the items listed on Schedule 3.14;

                   (j   to the extent transferable, the Permits that are listed
         on Schedule 2.01(j) (the "Transferred Permits");

                   (k  except  as set  forth  in  Section  2.02(e),  all  books,
         records,  files and papers,  whether in hard copy or  computer  format,
         used in the Business,  including,  without limitation, all medical care
         records  (including,  without  limitation,  PAP  records and slides and
         chain  of  custody  records),  sales  literature,   manuals  and  data,
         correspondence,  lists  of  present  and  former  suppliers,  invoices,
         personnel and employment records,  and any information  relating to any
         Tax imposed on the Purchased Assets ("Records");

                   (l to the  extent  included  in  Records as they exist on the
         date hereof,  without additional  compilation or formatting,  a list of
         all Persons to whom or to which  Seller has provided  clinical  testing
         services at any time on or prior to the Closing Date  (individually,  a
         "Customer"  and  collectively,  the  "Customers"),  along with  related
         information as to the date,  unit and dollar volume of such sales,  the
         type of service  furnished  and other  relevant  marketing  and product
         information for each Customer (the "Customer List");

                    (m  all  policy  rights  and  proceeds   payable  under  any
         insurance  policy covering the Purchased  Assets,  except to the extent
         such rights and proceeds reimburse Seller with respect to property that
         Seller has repaired or replaced prior to the Closing Date;

                   (n all goodwill associated with the Business or the Purchased
         Assets,  together  with the right to  represent  to third  parties that
         Buyer is the successor to the Business;

                    (o to the extent transferable, all rights and any associated
         value derived from or  associated  with the work force of the Business,
         and the  business  skill and  expertise  of such  work  force as of the
         Closing Date; and

                    (p   the lockbox arrangements in connection with the Daiwa
        Loan Agreements.



<PAGE>


         SECTION 2.2.  Excluded Assets.  Buyer expressly understands and agrees
that the following assets and properties of Seller (the "Excluded Assets")
shall be excluded from the Purchased Assets:

                   (a except  as  expressly  included  in the  Purchased  Assets
         pursuant to Section  2.01(d),  (e),  (f),  (g), (h) or (m), all cash on
         hand or on deposit,  certificates of deposit, time deposits, commercial
         paper,  treasury  bills,  notes and other  securities or similar items,
         including  without  limitation  any such  deposits that are security or
         collateral for Seller's obligations to third parties;

                   (b    all Shareholder Contracts;

                   (c    all funds arising from any Prepaid Expense to the
          extent that Seller is entitled to receive or retain any
          such amount pursuant to Section 2.10;

                   (d    Seller's Medicare provider numbers and any other
          Permits that are not transferable as a matter of law;

                   (e    Seller's and Subsidiary's corporate minute books and
         stock transfer books and other books and records relating solely to the
         Excluded Assets;

                   (f    all net operating losses and other tax attributes of
         Seller.

                   (g all contracts,  agreements,  licenses,  commitments, sales
         and purchase orders and clinical  testing orders that would be Material
         Contracts  but for the  fact  that  they  are not  listed  in  Schedule
         3.09(a), unless Buyer gives notice under Section 7.01(d);

                   (h     all contracts, agreements, licenses, commitments,
         sales and purchase orders and clinical testing orders that
         are listed in Schedule 2.02(h);

                   (i     all leases and subleases of real property that are
         listed in Schedule 2.02(i);

                   (j     all leases and subleases of personal property that
         are listed in Schedule 2.02(j);

                   (k     the automobiles listed in Schedule 2.02(k); and

                   (l    all Permits that are not listed in Schedule 2.01(j).



<PAGE>


         SECTION  2.3.  Assumed  Liabilities.  Upon the terms and subject to the
conditions  of  this  Agreement,  Buyer  agrees,  effective  at the  time of the
Closing,  to  assume  the  following,  and  only  the  following,   liabilities,
obligations  and  commitments  of  Seller  subject,  in each case to any and all
claims,  defenses,  offsets and rights of  recoupment  of Seller  (the  "Assumed
Liabilities"):

                   (a the  liabilities,  obligations  and  commitments of Seller
         under  the  Leases  and  Contracts  acquired  by or  assigned  to Buyer
         pursuant  to Section  2.01(a),  (b) or (d) to the extent  arising on or
         after the Closing Date;

                    (b the  liabilities,  obligations  and commitments of Seller
         under the licenses and other  Intellectual  Property Rights acquired by
         or assigned to Buyer pursuant to Section  2.01(i) to the extent arising
         on or after the Closing Date;

                    (c the  liabilities,  obligations  and commitments of Seller
         with  respect to the  repair or  replacement  (due to events  occurring
         prior to the  Closing  Date) of  Purchased  Assets as to which Buyer is
         entitled to insurance proceeds under Section 2.01(m);

                    (d    the liabilities, obligations and commitments of Seller
         for the period from and after the Closing Date under
         the Transferred Permits;

                    (e the  liabilities  of Seller  accrued but unpaid as of the
         Closing Date for wage income for the current normal pay period, and for
         vacation, sick payments,  severance or other paid time off only, due to
         or with respect to any  individual  who, as of the Closing  Date, is an
         Active  Employee,  in respect of their  employment with Seller prior to
         the Closing Date (collectively, "Payroll Liabilities");

                   (f the payment  obligations of Seller to the United States of
         America or any department,  agency or instrumentality thereof under the
         Settlement  Agreement  dated August 29, 1997, by and among Seller,  the
         United States  Department of Justice,  the United States  Department of
         Health and Human Services and various other governmental  organizations
         and Persons ("Settlement Agreement"); and

                   (g the liabilities under the Worker Adjustment and Retraining
         Notification  Act  of  1988  (the  "WARN  Act"),  with  respect  to any
         individuals who are Active  Employees of Seller on or after the earlier
         of (i) the date of this  Agreement or (ii) the date which is sixty (60)
         days prior to the Closing.



<PAGE>


         SECTION 2.4.  Excluded  Liabilities.  Notwithstanding  any provision in
this Agreement or any other writing to the contrary,  Buyer is assuming only the
Assumed  Liabilities  and is not assuming any other  liability,  cost,  expense,
claim,  obligation or commitment of Seller (or any  predecessor of Seller or any
prior owner of all or part of its  businesses  and  assets) of whatever  nature,
whether  presently in existence or arising  hereafter (all such  liabilities and
obligations  not  being  assumed  being  herein  referred  to as  the  "Excluded
Liabilities"),  and,  notwithstanding  anything to the  contrary in this Section
2.04,  none of the following  shall be Assumed  Liabilities  for the purposes of
this Agreement:

                   (a  any  liability,   cost,  expense,  claim,  obligation  or
         commitment  of Seller  relating  to or based on  events  or  conditions
         occurring  or  existing  prior to the Closing  Date,  whether or not in
         connection with, or arising out of, the Business as operated by Seller,
         or the ownership,  possession or use of the Purchased Assets by Seller,
         other than as expressly specified in Sections 2.03(c), (e), (f), (g) or
         (h);

                   (b except as expressly  specified in Sections 2.03(e) or (g),
         any Employee  Liabilities  in respect of employees of Seller arising on
         or prior to the Closing  Date or with respect to any employee of Seller
         who is not a  Transferred  Employee,  or arising in respect of Seller's
         failure to employ or continue to employ any employees;

                   (c  any  liability,   cost,  expense,  claim,  obligation  or
         commitment with respect to any indebtedness,  accounts payable or other
         liabilities  of  Seller  or  Subsidiary  (other  than  as  specifically
         provided in Section 2.03),  including  without  limitation any Seller's
         obligations  in respect of (i) the 15% Senior Secured Notes due 2004 of
         Seller,  (ii) the Senior  Secured  Notes due 2004 of Seller,  (iii) any
         other  indebtedness  to Oaktree or any other  Shareholder  and (iv) the
         Daiwa Loan Agreements, each as may have been amended;

                   (d  any  liability,   cost,  expense,  claim,  obligation  or
         commitment relating to any litigation, legal proceeding or governmental
         investigation or regulatory  investigation pending on the Closing Date,
         or instituted  thereafter,  to the extent based on events or conditions
         occurring  or  existing  in  connection  with,  or arising  out of, the
         activities  of Seller or Seller's  ownership,  possession or use of any
         property, including without limitation the Purchased Assets (other than
         as provided in Section 2.03(f));

                   (e  any  liability,   cost,  expense,  claim,  obligation  or
         commitment  to the extent  based on events or  conditions  occurring or
         existing  prior  to  the  Closing  Date,  and  relating  to  any of the
         following:  (i)  disputes  arising out of  services  rendered by Seller
         prior to the Closing Date,  including  without  limitation,  claims for
         refunds or overpayments,  returns, personal injury and property damage,
         or  (ii)  compliance  or  noncompliance  by  Seller  with  any  laws or
         regulations  relating  to the matters  specified  in clause (i) of this
         Section 2.04(e);



<PAGE>


                  (f     any Environmental Liabilities;

                   (g  any  liability,   cost,  expense,  claim,  obligation  or
         commitment  for any Taxes;  provided  that Transfer  Taxes  incurred in
         connection with the  transactions  contemplated by this Agreement shall
         be paid in the manner set forth in Section 8.03(c);

                   (h  any  liability,   cost,  expense,  claim,  obligation  or
         commitment  to the extent  relating to or based on events or conditions
         occurring  or  existing  in  connection  with,  or arising  out of, the
         Excluded Assets;

                   (i  any  liability,   cost,  expense,  claim,  obligation  or
         commitment  in, to or under the  Corporate  Integrity  Agreement  dated
         August 27, 1997  between  the United  States  Department  of Health and
         Human Services,  through the Office of the Inspector  General  ("OIG"),
         and Seller (the "Corporate Integrity Agreement"), including any and all
         amendments,   addenda,  exhibits  and  schedules  attached  thereto  or
         incorporated therein by reference (other than as expressly specified in
         Section 2.03(f));

                   (j  any  liability,   cost,  expense,  claim,  obligation  or
         commitment under the Leases, Contracts, Intellectual Property Rights or
         any Transferred  Permits, in each case to the extent arising or accrued
         before the Closing Date; and

                   (k    the liabilities of Seller for Patient Refunds.



<PAGE>


         SECTION  2.5.  Assignment  of  Contracts  and Rights.  Anything in this
Agreement to the contrary  notwithstanding,  this Agreement shall not constitute
an  agreement  to  assign  any  property,  right or  interest  of Seller if such
assignment  is  prohibited  by law or,  without  the  consent  of a third  party
thereto,  would  constitute a breach or other  contravention  of such  property,
right or interest or in any way  adversely  affect the rights of Buyer or Seller
in  connection  therewith,  and such  property,  right or interest will not be a
Purchased Asset under this Agreement. Seller and Buyer will use their reasonable
efforts  (but without any payment of money by Seller or Buyer other than payment
by Seller of cure  amounts)  to obtain the  consent of the other  parties to any
such property  right or interest that would,  in the absence of the  immediately
preceding  sentence,  be a  Purchased  Asset or any  property  right or interest
arising  thereunder  for the  assignment  thereof to Buyer as Buyer may request;
provided  that  nothing  herein  is  intended,  or  shall  be  construed,  as  a
representation,  warranty or guarantee  by any Seller that such  consents can or
will be obtained prior to the Closing. If such consent is not obtained, or if an
attempted  assignment thereof would be ineffective or would adversely affect the
rights of Buyer or Seller thereunder so that Buyer would not in fact receive all
such rights, Seller and Buyer will cooperate in a mutually agreeable arrangement
under which Buyer would, to the greatest extent practicable, obtain the benefits
and  assume  the  obligations  thereunder  in  accordance  with this  Agreement,
including  sub-contracting,  sub-licensing,  or sub-leasing  to Buyer,  or under
which the applicable  Seller would enforce for the benefit of Buyer,  with Buyer
assuming such Seller's  obligations,  any and all rights of any Seller against a
third party thereto.

         SECTION 2.6.  Purchase  Price;  Allocation  of Purchase  Price.  (a The
purchase price for the Purchased  Assets (the "Purchase  Price") is (i) the Cash
Amount  in cash,  (ii)  1,000,000  shares of Common  Stock  (the  "Consideration
Shares"),  (iii) a note of Buyer in the principal  amount equal to  $25,000,000,
bearing interest on the outstanding balance thereof at a rate of 7.5% per annum,
and in substantially  the form of Exhibit B hereto (the  "Consideration  Note"),
(iv) the Second Cash Payment  Amount in cash,  and (v) the Refund  Adjustment in
cash.  The Purchase Price shall be paid as provided in Section 2.07 and shall be
subject to adjustment as provided in Section 2.08.

          (b) As soon as practicable after the date hereof,  Buyer shall deliver
to Seller a statement on Form 8594 (the  "Allocation  Statement")  setting forth
the allocation of the Purchase Price (together with the Assumed  Liabilities and
plus or minus any  adjustments  pursuant to Section  2.08)  among the  Purchased
Assets in accordance with Section 1060 of the Code.

          (c) Seller  shall have a period of fifteen  days after the delivery of
the Allocation Statement to present in writing to Buyer notice of any objections
Seller may have to the allocation set forth in the Allocation Statement.  Unless
Seller timely objects,  the Allocation Statement shall be binding on the parties
without further adjustment.

          (d) If Seller  shall  raise any  objections  within  the  fifteen  day
period,  Buyer and Seller shall negotiate in good faith and use their respective
best efforts to resolve such  dispute.  If the parties fail to agree within five
days after the delivery of the notice, then each party may allocate the Purchase
Price as it determines.

          (e) If an Allocation  Statement is agreed upon, Buyer and Seller shall
(i) report an allocation of such Purchase Price among the Purchased  Assets in a
manner entirely consistent with the Allocation Statement, (ii) act, and to cause
their  Affiliates to act, in accordance with such Allocation  Statement,  in the
preparation of financial  statements  and filing of all tax returns  (including,
without limitation,  filing Form 8594 with its Federal income tax return for the
taxable year that includes the date of the Closing) and in the course of any tax
audit, tax review, or tax litigation relating thereto and (iii) take no position
and cause their Affiliates to take no position  inconsistent with the Allocation
Statement for all tax and accounting purposes.

          (f) If an  Allocation  Statement  is not agreed  upon,  not later than
thirty (30) days prior to the filing of their  respective Forms 8594 relating to
this transaction, each party shall deliver to the other party a copy of its Form
8594.


<PAGE>



         SECTION 2.7.  Closing.  The closing (the "Closing") of the purchase and
sale of the  Purchased  Assets and the  assumption  of the  Assumed  Liabilities
hereunder  shall  take  place at the  offices  of  Davis  Polk &  Wardwell,  450
Lexington  Avenue,  New York, New York, as soon as  practicable  and within five
Business Days after the date when any  applicable  waiting  period under the HSR
Act relating to the transactions  contemplated hereby shall have expired or been
terminated,  provided  that the  conditions  set forth in  Article  10 have been
satisfied,  or at such other time or place as Buyer and Seller may agree. At the
Closing:

          (a) Buyer shall  deliver to Seller (i) the Cash  Amount,  (ii) a stock
certificate  representing the Consideration  Shares in the name of Seller or its
designee and (iii) the Consideration Note.

          (b) Seller and Buyer shall  enter into an  Assignment  and  Assumption
Agreement in a form reasonably satisfactory to Seller and Buyer (the "Assignment
and Assumption Agreement"),  and Seller shall deliver to Buyer such deeds, bills
of sale,  endorsements,  consents,  assignments  and other  good and  sufficient
instruments  of conveyance  and  assignment as the parties and their  respective
counsel  shall deem  reasonably  necessary or  appropriate  to vest in Buyer all
right, title and interest in, to and under the Purchased Assets.

         SECTION 2.8. Purchase Price Adjustment.  To the extent any Lease listed
on Schedule 2.08 would, in the absence of the first sentence of Section 2.05, be
a  Purchased  Asset but cannot be  assigned or  delivered  to Buyer,  and to the
extent the benefits therefrom and obligations  thereunder have not been provided
by alternate arrangements  reasonably satisfactory to Buyer and Seller, the Cash
Amount  included in the  Purchase  Price will be reduced by the amount set forth
opposite such Lease on Schedule 2.08 (each, a "Purchase Price Adjustment").

         SECTION 2.9.  Remittance  Obligation.  From and after the Closing Date,
any amount received by Seller with respect to the Purchased  Assets or any asset
that would, in the absence of the first sentence of Section 2.05, be a Purchased
Asset  including,  without  limitation,  the  accounts  receivable  and proceeds
described  in Section  2.01(e)  shall be held in trust and remitted by Seller to
Buyer as promptly as  practicable.  From and after the Closing Date, any amounts
received by Buyer with respect to the Excluded Assets shall be held in trust and
remitted by Buyer to Seller as promptly as  practicable.  Buyer and Seller shall
each  be  entitled  to  request  and  receive,  on  reasonable  advance  notice,
supporting documentation confirming the accuracy of such remitted amounts.

         SECTION 2.10.  Prorations and Reimbursements; Security and Utility
Deposits.



<PAGE>


          (a) The  charges,  payments  and other  obligations  in respect of the
following  items shall be prorated as of the  Closing  Date  between  Seller and
Buyer,  based on the  actual  number  days of such  relevant  period  before the
Closing Date (which shall be allocated to Seller) and the actual  number of days
of such  relevant  period on or after the Closing Date (which shall be allocated
to the Buyer):

                  (i) all water,  electricity and other utility charges,  if any
         (other  than any utility  deposits,  which shall be governed by Section
         2.10(b)  below),  applicable  to any Seller's  place of business to the
         extent that final meter readings and billings cannot be arranged; and

                 (ii) all payments of fees, rents and other obligations,  if any
         (other  than  security  deposits,  which  shall be  governed by Section
         2.10(b) below) in respect of Transferred Permits, Leases and Contracts.

         Buyer and Seller shall use their  reasonable  efforts to calculate  and
agree upon all prorations at or prior to the Closing. Upon approval by Buyer and
Seller,  such  calculations  shall be binding and conclusive.  The net amount of
such  prorations  shall,  upon such approval,  be promptly  remitted by Buyer to
Seller if Seller is  entitled  to a credit  therefor,  and by Seller to Buyer if
Buyer is entitled to a credit therefor.

          (b) All security  deposits and utility  deposits of Seller that relate
to Leases or Contracts shall be Purchased  Assets and Buyer shall be entitled to
receive and retain any and all such  deposits;  provided  that if within 60 days
after the Closing Date, (i) Buyer terminates any such Lease or Contract, or (ii)
there is  otherwise  (A) an  expiration  of any such Lease or  Contract  and (B)
renewal is offered by the other party thereto on substantially  similar terms as
the original  Lease or Contract and (C) such renewal is rejected by Buyer,  then
Buyer  shall  pay to  Seller in cash,  within  five  Business  Days  after  such
termination or expiration, an amount equal to any pre-Closing cure payments made
by  Seller in order to  transfer  such  Lease or  Contract  to Buyer,  or in the
absence of any cure  payment  made by Seller,  an amount  equal to the  security
deposit  and  utilities  deposit  returned  to  Buyer or to  which  Buyer  would
otherwise be entitled.

         SECTION 2.11. Patient Refunds.  (a) Buyer shall act as agent for Seller
in order to process and pay  Patient  Refunds.  Buyer shall  process and pay, as
agent for Seller,  all Patient  Refunds  arising in the six months  prior to the
Closing Date, using the same policies and practices which Buyer normally uses in
the  management  of its own  business,  as described in Schedule  2.11.  For all
liabilities of Seller  associated  with Patient Refunds arising greater than six
months  prior to the Closing  Date,  Buyer  shall  process and pay, as agent for
Seller,  only  those  Patient  Refunds  which (i) Buyer  determines  based  upon
Seller's  records are valid  Patient  Refunds,  and (ii) have been  specifically
requested by the Patient or their authorized representative.



<PAGE>


          (b) If any Person sets off against  any  receivable  assigned to Buyer
any claimed  amount of Patient  Refund,  Buyer shall (i) promptly,  upon notice,
provide details to Seller,  and (ii) notify such Person,  in writing,  that such
Patient  Refund is a  liability  of Seller,  and cannot be set-off  against  the
receivable which is payable by such debtor to Buyer.

          (c) A Refund  Adjustment  ("Refund  Adjustment")  shall be  determined
within 180 days of the  Closing  Date or sooner,  if  practicable  (the  "Refund
Adjustment Date"), which shall be equal to $500,000, minus

                  (i) the aggregate  amount of Patient  Refunds paid by Buyer as
agent for Seller as provided in Section 2.11(a), and

                 (ii) the aggregate amount by which any receivables  acquired by
         Buyer have been reduced or unpaid specifically as a result of a set-off
         by any Person against such  receivables  of any claimed  Patient Refund
         (that  Buyer  would  not have  contested  using  its  customary  refund
         procedures).

          (d) On the first Business Day after the Refund  Adjustment Date, Buyer
shall deliver to Seller a statement  setting forth  Buyer's  calculation  of the
Refund Adjustment together with payment in cash of such amount owed by Buyer. If
the statement  provides that Seller owes money to Buyer under this Section 2.11,
Seller shall make such  payment to Buyer in cash within  fifteen  Business  Days
after receipt of Buyer's  statement.  If Buyer and Seller  disagree,  they shall
follow the procedures set forth in Section 2.13.

         SECTION 2.12.  Second Cash Payment.  On the first Business Day which is
at least sixty days after the  Closing  Date,  Buyer  shall  deliver to Seller a
statement   (the  "Second  Cash  Payment   Statement")   setting  forth  Buyer's
calculation of the Second Cash Payment  Amount  together with payment in cash of
such amount owed by Buyer.  If the statement  provides that Seller owes money to
Buyer under this Section  2.12,  Seller shall make such payment to Buyer in cash
within fifteen  Business Days after receipt of Buyer's  statement.  If Buyer and
Seller disagree, they shall follow the procedures set forth in Section 2.13.

         SECTION 2.13.  Adjustment Disputes.  Within fifteen Business Days after
Seller  receives  Buyer's  calculation  of the Second Cash Payment Amount or the
Refund  Adjustment,  as  applicable,  Seller  shall notify Buyer that Seller (i)
approves  such  calculation,  or (ii) disputes  such  calculation.  In the event
Seller disputes such calculation, Buyer and Seller shall negotiate in good faith
to  determine  a mutually  acceptable  calculation  of such  amount.  Within two
Business Days of resolution,  by mutual  agreement or by arbitration,  the party
owing monies hereunder shall pay such amounts in cash.



<PAGE>


         SECTION 2.14.  Transition Leases. (a) At the Closing, Buyer and Seller
shall enter into a master sublease for the leases and subleases specified in
Schedule 2.14 (each, a "Transition Lease").  The master sublease will include
following terms:

          (i) for the  period of the  sublease,  Buyer  shall pay to Seller  the
rental payments for each  Transition  Lease in the amount Seller pays under such
lease and Buyer shall  comply with the  non-monetary  covenants  of Seller under
such Transition Lease; and

         (ii)  indemnity  from Buyer to Seller for  damages  incurred  by Seller
solely as a result of (A) the  sublease  from Seller to Buyer or (B) as a result
of any actions, or use or possession of the premises, by Buyer after the Closing
(including  any reduction in the amount of security  deposit  returned to Seller
because  of  damages  to the  leased  property  during  the  term of the  master
sublease);  provided, that to the extent Seller was in default of the Transition
Lease prior to the entry of the master sublease,  any damages resulting from any
such  default of Seller will be deemed not be incurred as a result of the master
sublease;  and  provided,  further,  that  Buyer will not  indemnify  Seller for
damages incurred due to early termination of any Transition Lease.

         (b) At the  Closing,  Buyer and  Seller  shall  enter into a lease (the
"Auto Lease") for the automobiles  listed in Schedule 2.02(k) (each, an "Auto").
Such lease will include the following terms:

          (i) for the  period  from the  Closing  Date to the date that is sixty
days after the Closing Date,  Buyer shall pay to Seller rental payments for each
Auto in the amount Seller pays as the deferred  purchase price for such Auto for
that period;

         (ii) indemnity from Buyer to Seller for damages incurred by Seller as a
result of any actions,  or use or  possession  of the Autos,  by Buyer after the
Closing  (including any reduction in the amount of security  deposit returned to
Seller  because  of damages  to the Autos  during  the term of the Auto  Lease);
provided,  that to the extent  Seller was in default of the agreement to acquire
the Auto prior to the entry of the Auto Lease,  any damages  resulting  from any
such default of Seller will be deemed not to be incurred as a result of the Auto
Lease; and provided,  further,  that Buyer will not indemnify Seller for damages
incurred  due to the  failure to pay the  deferred  purchase  price of the Autos
after the Autos are returned to Seller; and

        (iii) Seller makes no representation or warranty on the ability of Buyer
to have possession of the Autos after the Closing Date. Buyer  acknowledges that
in the event of acceleration  or repossession  caused by the Auto Lease, it will
be Buyer's option to either repay the remaining balance of the deferred purchase
price on such Auto or permit  repossession  by lender  and Buyer  shall  have no
recourse against Seller.



<PAGE>


         SECTION 2.15.  Payments in Cash.  Payments to be made in cash hereunder
shall be made in immediately  available  funds by wire transfer to an account of
the  recipient  with a bank in New York City  designated  by such  recipient not
later  than  two  Business  Days  prior  to the  date of  payment  (or if not so
designated,  then by certified  or official  bank check  payable in  immediately
available funds to the order of the recipient in such amount).

                                    ARTICLE 3

                    REPRESENTATIONS AND WARRANTIES OF SELLER

         Seller represents and warrants to Buyer as of the date hereof and as of
the Closing Date that:

         SECTION 3.1.  Corporate  Existence and Power. Each of Seller and, prior
to merger with and into Seller,  Subsidiary is a corporation duly  incorporated,
validly  existing and in good  standing  under the laws of its  jurisdiction  of
incorporation  and has  all  corporate  powers  and  all  material  governmental
licenses,  authorizations,  permits, consents and approvals required to carry on
its business as now conducted. Each of Seller and, prior to merger with and into
Seller, Subsidiary is duly qualified to do business as a foreign corporation and
is in good standing in each jurisdiction  where such qualification is necessary,
except  for those  jurisdictions  where  failure  to be so  qualified  could not
reasonably  be  expected,  individually  or in the  aggregate,  to have a Seller
Material  Adverse  Effect.  Seller has  heretofore  delivered  to Buyer true and
complete  copies of the  certificate of  incorporation  and bylaws of Seller and
Subsidiary as currently in effect.

         SECTION  3.2.  Corporate  Authorization.  The  execution,  delivery and
performance by Seller of this Agreement and the  Registration  Rights  Agreement
and  all  related   documents  and  agreements  and  the   consummation  of  the
transactions  contemplated  hereby and  thereby  are within  Seller's  corporate
powers and have been duly  authorized by all necessary  corporate  action on the
part of Seller including any required  approval or consent by the  Shareholders.
This Agreement constitutes a valid and binding agreement of Seller.

         SECTION 3.3. Governmental  Authorization.  The execution,  delivery and
performance by Seller of this Agreement and the  Registration  Rights  Agreement
and all related  documents and agreements the  consummation of the  transactions
contemplated hereby and thereby require no action by or in respect of, or filing
with, any  Governmental  Authority other than (i) compliance with any applicable
requirements  of the HSR Act and (ii) any notice required to be given to the OIG
under the Corporate Integrity Agreement.



<PAGE>


         SECTION 3.4. Noncontravention.  The execution, delivery and performance
by  Seller of this  Agreement  and the  Registration  Rights  Agreement  and all
related documents and agreements  (including any documents or agreements related
to the merger of Subsidiary  with and into Seller) and the  consummation  of the
transactions contemplated hereby do not and will not (i) violate the certificate
of  incorporation  or bylaws of Seller or Subsidiary,  (ii) assuming  compliance
with the matters  referred to in Section 3.03,  violate any material  applicable
law, rule, regulation, judgment, injunction, order or decree, (iii) assuming the
obtaining of all  Material  Consents  and other  consents,  constitute a default
under or give rise to any right of termination,  cancellation or acceleration of
any right or  obligation  of Buyer or to a loss of any  benefit  relating to the
Business  to which  Seller is entitled  under any Lease or Material  Contract or
(iv) result in the creation or imposition  of any Lien on any  Purchased  Asset,
other than Permitted Liens.

         SECTION  3.5.  Material  Consents.  Schedule  3.05 sets  forth each (a)
Material  Contract,  (b) Lease, or (c) Transferred Permit requiring a consent or
other  action  by  any  Person  as a  result  of  the  execution,  delivery  and
performance  of  this  Agreement  by  Seller  or  Subsidiary  or the  merger  of
Subsidiary  with and into Seller.  Nothing in this Section 3.05 is intended,  or
shall be construed,  as a  representation,  warranty or guarantee by Seller that
such consents can or will be obtained  prior to or after the Closing.  As of the
Closing Date, all consents or actions have been received or taken except (i) any
consent required under Contracts with Customers or (ii) where failure to receive
such consent or take such action could  reasonably be expected,  individually or
in the  aggregate,  to have a Seller  Material  Adverse  Effect  (the  "Material
Consents").

         SECTION 3.6. Financial Statements. The audited balance sheets of Seller
and Subsidiary as of February 29, 1996,  February 28, 1997 and February 28, 1998
and the  related  audited  statements  of income  and cash flows for each of the
years  then  ended,  and the  unaudited  interim  balance  sheet of  Seller  and
Subsidiary as of the Balance Sheet Date and the related unaudited  statements of
income  and cash flow for the  twelve  months  then  ended  fairly  present,  in
conformity with generally accepted accounting principles applied on a consistent
basis (except as may be indicated in the notes thereto),  the financial position
of Seller and Subsidiary as of the dates thereof and their results of operations
and  cash  flows  for  the  periods  then  ended  (subject  to  normal  year-end
adjustments in the case of any unaudited interim financial statements).

         SECTION  3.7.  Absence  of  Certain  Changes.  Except as  disclosed  on
Schedule 3.07,  the Business has been conducted  since the Balance Sheet Date in
the ordinary course consistent with past practices and there has not been:



<PAGE>


                  (a)  any   event,   occurrence,   development   or   state  of
         circumstances  or facts which has had or could  reasonably be expected,
         individually  or in the aggregate,  to have a Seller  Material  Adverse
         Effect other than the  negotiation,  execution and consummation of this
         Agreement and related  agreements with Buyer;  provided that Seller has
         advised the Buyer that Seller may commence  proceedings  under laws for
         the  relief  of  debtors   after  the  Closing  and  Seller   makes  no
         representation  or warranty as to the actual or potential  effect after
         the  Closing  Date on the  Business  or the  Purchased  Assets  of slow
         payments by or to  suppliers,  vendors and other  contractors,  lost or
         terminated customer accounts or customer relationships,  information or
         rumors  communicated  by or to Seller's or  Subsidiary's  employees and
         competitors,  or other  potentially  adverse effects on the Business or
         the  Purchased  Assets which may arise after the Closing as a result of
         the commencement of such proceedings;

                  (b) any  incurrence,  assumption  or  guarantee  by  Seller or
         Subsidiary of any indebtedness for borrowed money other than additional
         advances or loans from Oaktree;

                  (c)  any  creation  or  other  incurrence  of any  Lien on any
         Purchased   Asset  other  than  in  the  ordinary  course  of  business
         consistent with past practices;

                  (d) any damage, destruction or other casualty loss (whether or
         not covered by insurance) which has had or could reasonably be expected
         to have,  individually or in the aggregate,  a Seller Material  Adverse
         Effect;

                  (e) any  transaction  or  commitment  made, or any contract or
         agreement  entered  into,  by  Seller  or  Subsidiary   (including  the
         acquisition  or  disposition  of any assets) or any  relinquishment  by
         Seller or Subsidiary of any material contract or other right other than
         transactions  and  commitments  in  the  ordinary  course  of  business
         consistent   with  past  practices  and  those   contemplated  by  this
         Agreement;

                  (f) any  change in any  method  of  accounting  or  accounting
         practice by Seller or  Subsidiary  except for any such change after the
         date hereof  required  by reason of a  concurrent  change in  generally
         accepted accounting principles;

                  (g)  any (i)  employment,  deferred  compensation,  severance,
         retirement or other similar  agreement entered into with any officer or
         employee of Seller or Subsidiary (or any amendment to any such existing
         agreement),  (ii)  grant of any  severance  or  termination  pay to any
         officer or employee of Seller or Subsidiary or (iii) change, other than
         in the ordinary course of business  consistent  with past practice,  in
         compensation  or other  benefits  payable to any officer or employee of
         Seller or Subsidiary  pursuant to any severance or retirement  plans or
         policies thereof;



<PAGE>


                  (h)  any  labor   dispute,   other  than  routine   individual
         grievances,  or  any  activity  or  proceeding  by  a  labor  union  or
         representative   thereof  to  organize  any   employees  of  Seller  or
         Subsidiary, which employees were not subject to a collective bargaining
         agreement  at  the  Balance  Sheet  Date,  or  any  lockouts,  strikes,
         slowdowns,  work  stoppages  or threats  thereof by or with  respect to
         employees of Seller or Subsidiary;

                  (i) any  capital  expenditure,  or  commitment  for a  capital
         expenditure,  for  additions or  improvements  to  property,  plant and
         equipment,  other than any capital expenditures since the Balance Sheet
         Date which  individually  is less than $10,000 and in the aggregate are
         less than $100,000; or

                  (j) any declaration,  setting aside or payment of any dividend
         or other  distribution  with respect to any shares of capital  stock of
         Subsidiary,  or any  repurchase,  redemption  or other  acquisition  by
         Seller of any outstanding Subsidiary Securities.

         SECTION  3.8. No  Undisclosed  Material  Liabilities.  (a) There are no
liabilities  of  Seller of any kind  whatsoever,  whether  accrued,  contingent,
absolute,  determined,  determinable  or  otherwise,  and  there is no  existing
condition,  situation or set of circumstances which could reasonably be expected
to result in such a liability, other than:

                  (i)    liabilities arising under this Agreement and related
         agreements with Buyer;

                 (ii) liabilities provided for in the Balance Sheet or disclosed
         in the notes thereto;

                (iii) (A) undisclosed  liabilities  which  individually are less
         than $15,000 and in the aggregate are less than $150,000,  (B) purchase
         orders in the  ordinary  course or (C)  payables  described on Schedule
         3.08(a);

                 (iv) other liabilities disclosed on Schedule 3.08(a); and

                  (v) liabilities disclosed on Schedule 3.10.

          (b) Seller's payment obligations under the Settlement Agreement are in
the amount of, and do not exceed, the amounts set forth on Schedule 3.08(b).

         SECTION 3.9.  Material  Contracts.  (a) Schedule 3.09(a)  constitutes a
complete and accurate  list of all  Contracts  of the  following  types to or by
which  Seller or  Subsidiary  is a party or bound,  and which  except  for those
Contracts  described in clauses (iii),  (iv), (vii) and (viii) below, (A) cannot
be  terminated  within  sixty days  without  penalty  and (B) provide for annual
payments  by  or  to  Seller  or  Subsidiary  of at  least  $100,000  ("Material
Contracts"):



<PAGE>


                  (i)    any agreement for the purchase of materials, supplies,
         goods, services, equipment or other assets;

                 (ii)  any  sales,   distribution  or  other  similar  agreement
         providing  for  the  sale or  provision  by  Seller  or  Subsidiary  of
         materials,  supplies,  goods,  services,  equipment  or  other  assets,
         including  without  limitation,  lab  services  agreements,  phlebotomy
         agreements and venipuncture agreements;

                (iii) any partnership,  joint venture or other similar agreement
         or arrangement;

                 (iv) any agreement  relating to the  acquisition or disposition
         of Seller,  Subsidiary  or the  Business  (whether  by merger,  sale of
         stock, sale of assets or otherwise) or any material assets of Seller or
         Subsidiary;

                  (v) any agreement  relating to the deferred  purchase price of
         property whether incurred, assumed, guaranteed or secured by any asset;

                 (vi) any option or license to  provide  lab  testing  services,
         franchise of the Business or send out agreement;

                (vii)    any independent sales representative agreement;

               (viii)  any  agreement  that  limits  the  freedom  of  Seller or
         Subsidiary  to compete in any line of business or with any Person or in
         any  area or to own,  operate,  sell,  transfer,  pledge  or  otherwise
         dispose of or encumber any Purchased  Asset or which would so limit the
         freedom of Buyer after the Closing Date; or

                 (ix) any other agreement,  commitment,  arrangement or plan not
         made in the ordinary course of business.

          (b)  Except as set forth in  Schedule  3.09(b),  as of  Closing,  each
Material  Contract  and each other  agreement  that is required to be  disclosed
pursuant to this Section is a valid and binding agreement of the Seller, subject
to bankruptcy,  insolvency or similar laws affecting  creditor rights generally,
and is in full force and effect,  and  neither  Seller or, to the  knowledge  of
Seller,  any other party thereto is in default or breach in any material respect
under the terms of any such Contract,  and, to the knowledge of Seller, no event
or circumstance  has occurred that, with notice or lapse of time or both,  would
constitute  any event of default  thereunder.  True and complete  copies of each
such Contract have been delivered to Buyer.

          (c) Schedule  3.09(c) is a complete and accurate list of all Contracts
that are  capitated  managed  care  contracts,  with  the  term and  termination
provisions thereof.


<PAGE>



         SECTION  3.10.  Litigation.  Schedule  3.10  lists  any  action,  suit,
investigation or proceeding (or any basis therefor)  pending against,  or to the
knowledge of Seller, threatened against or affecting,  Seller, Subsidiary or any
Purchased  Asset  before any  Governmental  Authority or  arbitrator.  No matter
listed on Schedule  3.10  individually  or in the  aggregate,  if  determined or
resolved adversely to Seller or Subsidiary, could reasonably be expected to have
a  Seller  Material  Adverse  Effect  or in any  manner  challenges  or seeks to
prevent, enjoin, alter or delay the transactions contemplated by this Agreement.

         SECTION  3.11.  Compliance  with Laws and Court  Orders.  Except as set
forth in Schedule  3.11,  neither  Seller nor Subsidiary is in violation of, has
since November 8, 1996  violated,  and to the knowledge of Seller neither Seller
nor Subsidiary is under  investigation with respect to or has been threatened to
be charged with or given notice of any  violation  of, any  applicable  material
law, rule, regulation, judgment, injunction, order or decree.

         SECTION 3.12.  Properties.  (a) Schedule 3.12(a) correctly describes
all real property used or held for use in the Business and which Seller or
Subsidiary leases, operates or subleases, specifying in the case of leases, the
lease term and basic rent. Neither Seller nor Subsidiary owns any real property.

          (b)  Schedule  3.12(b)  correctly  describes  all  items  of  tangible
personal  property  used or held  for use in the  Business,  including,  without
limitation,  machinery, equipment, furniture, vehicles, storage tanks, spare and
replacement parts, fuel and other trade fixtures and fixed assets,  which Seller
or Subsidiary  owns,  leases or subleases,  specifying in the case of leases and
subleases the name of the lessor or sublessor,  the lease term and basic monthly
rent;  provided that no assurances  can be given as to the present  condition or
existence of items of less than $1,000 in value other than microscopes currently
being used in the Business.

          (c) Seller  has a valid and  subsisting  leasehold  estate in, and the
right to quiet  enjoyment of, the Real Property.  Seller has good and defensible
title to all Purchased Assets (whether real, personal, tangible or intangible).

         (d) The Real  Property  includes  only such real property as is used or
held for use by  Seller in  connection  with the  conduct  of the  business  and
operations of the Business as heretofore conducted by Seller.



<PAGE>


          (e)  Except as set forth on  Schedule  3.12(e),  all Leases are valid,
binding and enforceable in accordance with their  respective  terms,  subject to
bankruptcy,  insolvency or similar laws affecting creditor rights generally, and
there does not exist under any such Lease any monetary or other material default
or any event which with notice or lapse of time or both would  constitute such a
default.
          (f) To Seller's  knowledge,  the  equipment  included in the Purchased
Assets have no material defects,  are in good operating condition and repair and
have been reasonably  maintained consistent with standards generally followed in
the  industry  (giving  due  account to the age and  length of use of same,  and
ordinary wear and tear excepted).

          (g) No Purchased Asset is subject to any Lien, except:

                  (i)    Liens disclosed on the Balance Sheet;

                 (ii)  Liens for taxes  not yet due or being  contested  in good
         faith  (and  for  which   adequate   accruals  or  reserves  have  been
         established on the Balance Sheet and identified in the notes thereto;

                (iii) Liens constituting  purchase money security interests that
are described on Schedule 3.12(g)(iii);

                 (iv) Liens which do not  materially  detract  from the value of
         such Purchased  Asset, or materially  interfere with any present use of
         such  Purchased  Asset (clause (i) - (iv) of this Section  3.12(g) are,
         collectively, the "Permitted Liens"); or

                  (v)    Liens described on Schedule 3.12(g)(v) which will be
         discharged on or prior to the Closing Date.

         SECTION 3.13. Sufficiency of and Title to the Purchased Assets. (a) The
Purchased  Assets,  together  with the Excluded  Assets,  constitute  all of the
property  and assets used or held for use in the  Business  and are  adequate to
conduct the Business as  currently  conducted  by Seller;  provided  that Seller
makes no  representation  or  warranty  as to  whether  any of its  Intellectual
Property Rights or other Purchased Assets will operate correctly with respect to
date data for dates during and after the Year 2000.

          (b) The delivery to Buyer of the  instruments of transfer of ownership
contemplated by this Agreement will vest good and defensible title in and to, or
a valid leasehold  interest in, each of the Purchased Assets,  free and clear of
all Liens, except for Permitted Liens.



<PAGE>


         SECTION 3.14.  Intellectual Property. (a) Schedule 3.14 contains a list
of all Intellectual  Property Rights owned or licensed by Seller,  specifying as
to each, as applicable: (i) the nature of such Intellectual Property Right, (ii)
the owner of such  Intellectual  Property Right,  (iii) except for  Intellectual
Property Rights arising under licenses granted to Seller by third parties, as to
which Seller makes no such representation or warranty,  (A) the jurisdictions by
or in which such  Intellectual  Property Right is recognized  (without regard to
registration), has been issued or registered or in which an application for such
issuance or  registration  has been filed,  (B) the  registration or application
numbers and (C) the  termination or expiration  dates,  and (iv) the identity of
any Person to whom Seller has licensed any Intellectual Property Rights.

          (b) Since  November  8, 1996,  except as set forth on  Schedule  3.14,
neither  Seller  nor  Subsidiary  has  been a  defendant  in any  action,  suit,
investigation or proceeding  relating to, or otherwise has been notified of, any
alleged claim of infringement of any Intellectual Property Right, and Seller has
no  knowledge of any other such  infringement  by either  Seller or  Subsidiary.
Except for  Intellectual  Property  Rights arising under any license  granted to
Seller by third  parties,  as to which  Seller makes no such  representation  or
warranty,  Seller has no outstanding  claim or suit for, or has no knowledge of,
any continuing  infringement  by any other Person of any  Intellectual  Property
Rights. To Seller's knowledge,  no Intellectual Property Right is subject to any
outstanding judgment, injunction, order, decree or agreement restricting the use
thereof by Seller or Subsidiary  with respect to the Business or restricting the
licensing  thereof  by Seller to any  Person.  No Seller  has  entered  into any
agreement to indemnify any other Person  against any charge of  infringement  of
any Intellectual Property Right.

         SECTION 3.15.  Insurance Coverage.  Schedule 3.15 sets forth a list of,
and true and complete  copies of, all  insurance  policies  and  fidelity  bonds
relating to the Purchased  Assets,  the business and  operations of the Business
and its  officers  and  employees.  There is no claim by  Seller  or  Subsidiary
pending under any of such policies or bonds as to which coverage has been denied
or disputed by the underwriters of such policies or bonds or in respect of which
such  underwriters  have reserved their rights.  All premiums  payable under all
such policies and bonds have been timely paid and Seller has otherwise  complied
fully with the terms and  conditions of all such policies and bonds except where
such  untimely  payment  or  noncompliance  would not have an affect on  Buyer's
ability to receive any insurance proceeds due Buyer. Such policies and bonds are
and have been written by insurers of recognized financial responsibility against
such  losses and risks and in such  amounts as is prudent and  customary  in the
businesses in which Seller and Subsidiary  are engaged.  Seller does not know of
any threatened  termination  of or material  alteration of coverage under any of
such policies or bonds.  Except as disclosed in Schedule 3.15, after the Closing
Seller shall continue, at its sole cost and expense, to have coverage under such
policies and bonds with respect to events occurring prior to the Closing.



<PAGE>


         SECTION 3.16. Permits.  Schedule 3.16 sets forth a complete and correct
list  of  all  Permits.  Seller  has  all  Permits  issued  by  all  appropriate
Governmental  Authorities  necessary  to conduct the  Business,  as conducted by
Seller,  and Seller has not received any notice of  proceedings  relating to the
revocation or modification of any Transferred Permit. To Seller's knowledge,  no
condition,  event, occurrence or omission exists that would cause the revocation
or  modification  of any  Transferred  Permit,  except where such  revocation or
modification  could not reasonably be expected to have a Seller Material Adverse
Effect or a material  adverse effect on the use by Buyer of the Purchased Assets
after the Closing Date.

         SECTION  3.17.  Receivables.  Schedule  3.17  sets  forth a list of all
accounts,  notes receivable and other receivables of Seller and Subsidiary as of
March 31, 1999. All accounts,  notes receivable and other receivables  reflected
on Schedule 3.17 (other than  receivables  collected  since March 31, 1999) are,
and all accounts and notes receivable  arising from or otherwise relating to the
Business  at the Closing  Date will be,  valid,  genuine  and legal,  subject to
normal and customary trade  discounts,  less any reserves for doubtful  accounts
specified  on  Schedule  3.17.  Upon  the   consummation  of  the   transactions
contemplated  hereby on the Closing Date, all accounts and notes receivable,  or
proceeds  thereof  in the case of any  Restricted  Receivables  arising  from or
otherwise  relating  to the  Business  after  March 31,  1999  shall  constitute
Purchased  Assets or  assets  of  Subsidiary  except  to the  extent  previously
collected by Seller or Subsidiary in the ordinary course.

         SECTION  3.18.  Selling  Documents.  None  of  the  representations  or
warranties made by Seller herein, nor any other written information  provided by
or  on  behalf  of  Seller  or  Subsidiary  to  Buyer  in  connection  with  the
transactions  contemplated by this Agreement  contains any untrue statement of a
material fact or omits to state a material  fact  necessary in order to make the
statements contained therein, in light of the circumstances under which they are
or were made, not misleading.

         SECTION 3.19.  Finders' Fees.  Except for Adirondack  Capital Advisors,
whose fees will be paid by Seller, there is no investment banker, broker, finder
or other  intermediary  which has been  retained by or is  authorized  to act on
behalf of Seller,  Subsidiary, any Shareholder or any other Affiliate of Seller,
Subsidiary or any, Shareholder who might be entitled to any fee or commission in
connection with the transactions contemplated by this Agreement.

         SECTION  3.20.  Employees.  (a) Schedule  3.20(a) sets forth a true and
complete list of (i) the names,  titles,  annual salaries and other compensation
of all employees of Seller and Subsidiary  (ii) the wage rates for  non-salaried
employees of Seller and  Subsidiary  (by  classification)  and (iii)  commission
plans  for  sales,  service  and  marketing  employees  as of the  date  of this
Agreement.



<PAGE>


          (b) Except as  disclosed in Schedule  3.20(b),  as of the date of this
Agreement no officer,  senior management  executive or sales personnel has given
notice  to the CEO of  Seller of an actual  resignation  or  retirement,  or any
intended date of  resignation or  retirement,  and the CEO of Seller,  after due
inquiry,  has  determined  that Seller's sales manager has not received any such
notice.

          (c) There is no  liability  to James  Murray  Pitton for any  payment,
obligation or commitment  for any bonus,  profit-sharing  or similar  payment by
Seller.

          (d) Notwithstanding the foregoing, Seller shall have no obligation and
makes no representation,  warranty or guaranty regarding its ability to maintain
and preserve the work force of the Business after the date hereof.

         SECTION 3.21.  Environmental Compliance.  (a) Except as disclosed on
Schedule 3.21, the following is true and correct:

                  (i) no notice, notification,  demand, request for information,
         citation,  summons  or order has been  received,  no  penalty  has been
         assessed,  no  complaint  has been filed and  served on Seller,  and to
         Seller's  knowledge no complaint  has been filed and no  investigation,
         action,  claim, suit,  proceeding or review is pending or threatened by
         any Governmental  Authority or other Person with respect to any matters
         relating to Seller and Subsidiary and relating to or arising out of any
         Environmental Law;

                 (ii)  to  Seller's   knowledge,   there  are  no  Environmental
         Liabilities, and there are no facts, events, conditions,  situations or
         set of circumstances which could reasonably be expected to result in or
         be the basis for any Environmental Liabilities;

                (iii) to Seller's  knowledge,  no Hazardous  Substance  has been
         discharged,  disposed of, dumped, injected, pumped, deposited, spilled,
         leaked,  emitted or released  at, on or under any Real  Property or any
         other real  property  now or  previously  owned,  leased or operated by
         Seller  or  Subsidiary   other  than  in  accordance   with  applicable
         Environmental Laws;

                 (iv) to Seller's  knowledge,  there currently are no, and since
         the date Seller took  possession  of any  premises  subject to a Lease,
         there has not been any,  Underground  Storage Tanks (as defined  below)
         located  upon  and/or  serving  the  premises  subject to the Leases of
         Seller or  Subsidiary.  "Underground  Storage Tank" for the purposes of
         this Agreement  shall mean any one or  combination of tanks,  including
         appurtenant pipes, lines, fixtures and other related equipment, used to
         contain an accumulation of Hazardous  Substances,  the volume of which,
         including  the volume of the  appurtenant  pipes,  lines,  fixtures and
         other related equipment, is ten percent (10%) or more below the ground;
         and



<PAGE>


                  (v)  to  Seller's  knowledge,  Seller  and  Subsidiary  are in
compliance with all Environmental Laws.

          (b)  To   Seller's   knowledge,   there  has  been  no   environmental
investigation,  study,  audit,  test,  review  or other  analysis  conducted  in
relation to any  Purchased  Asset or any other real  property now or  previously
owned or leased by Seller or Subsidiary which has not been delivered to Buyer at
least five days prior to the date hereof.

          (c) None of the Real Property is located in New Jersey or Connecticut.

          (d) For purposes of this Section,  the term "Seller" shall not include
any entity which is, in whole or in part, a predecessor of Seller.

         SECTION 3.22. Investment  Representations.  Seller (i) is acquiring the
Consideration  Shares and the  Consideration  Note and (ii) upon  receipt of any
additional Notes or Conversion  Shares in accordance with the terms of any Note,
will acquire such Notes and Conversion Shares for its own account and not with a
view towards,  or for resale in connection with, the public sale or distribution
thereof,  except  pursuant to sales  registered or exempted  under the 1933 Act;
provided,  however,  that by making the representations  herein, Seller does not
agree to hold any Securities for any minimum or other specific term and reserves
the  right  to  dispose  of the  Securities  at any time in  accordance  with or
pursuant to a registration statement or an exemption under the 1933 Act. Without
limiting the foregoing, Buyer acknowledges that Seller is required to pledge the
Consideration  Shares and the  Consideration  Note and any  additional  Notes or
Conversion  Shares  pursuant to the terms of the Security  Agreement dated as of
June 12, 1998 between Seller and Oaktree, as amended.

          (a) Seller is an "accredited investor" as that term is defined in Rule
501(a) of Regulation D as promulgated by the SEC under the 1933 Act.

          (b) Seller  understands  that the Securities are being issued to it in
reliance on specific  exemptions  from the  registration  requirements of United
States federal and state  securities laws and that Buyer is relying in part upon
the truth and accuracy of, and Seller's  compliance  with, the  representations,
warranties,  agreements,  acknowledgments and understandings of Seller set forth
herein  in  order to  determine  the  availability  of such  exemptions  and the
eligibility of Seller to acquire the Securities.

          (c) Seller  understands  that no United States federal or state agency
or any other Government  Authority has passed on or made any  recommendation  or
endorsement of the Securities or the fairness or suitability of an investment in
the Securities nor have such  authorities  passed upon or endorsed the merits of
the issuance of the Securities.



<PAGE>


          (d) Seller  understands  that except as  provided in the  Registration
Rights  Agreement (i) the Securities have not been and are not being  registered
under the 1933 Act or any state  securities  laws,  and may not be  offered  for
sale,  sold,   assigned  or  transferred  unless  (A)  subsequently   registered
thereunder,  (B) the Securities to be sold, assigned or transferred may be sold,
assigned or transferred pursuant to an exemption from such registration,  or (C)
such  Securities  can be sold,  assigned  or  transferred  pursuant  to Rule 144
promulgated  under the 1933 Act (or a successor rule thereto) ("Rule 144"); (ii)
any sale of the  Securities  made in  reliance  on Rule 144 may be made  only in
accordance  with  the  terms  of  Rule  144  and  further,  if  Rule  144 is not
applicable, any resale of the Securities under circumstances in which the seller
(or the person through whom the sale is made) may be deemed to be an underwriter
(as that term is defined in the 1933 Act) may require compliance with some other
exemption under the 1933 Act or the rules and regulations of the SEC thereunder;
and (iii) neither Buyer nor any other person is under any obligation to register
such  securities  under the 1933 Act or any state  securities  laws or to comply
with the terms and conditions of any exemption thereunder.

          (e) Seller  understands  that the  certificates  or other  instruments
representing the Securities shall bear a restrictive legend in substantially the
following form (and a stop-transfer order may be placed against transfer of such
certificates):

         [NEITHER THIS NOTE, THE NOTES ISSUABLE IN RESPECT OF INTEREST HEREUNDER
         NOR THE] [THESE]  SHARES OF THE ISSUER'S  COMMON STOCK  [ISSUABLE  UPON
         CONVERSION  HEREOF] HAVE [NOT] BEEN REGISTERED UNDER THE SECURITIES ACT
         OF 1933, AS AMENDED (THE  "SECURITIES  ACT"),  OR ANY STATE  SECURITIES
         LAWS.  [THIS  NOTE HAS BEEN (AND ANY SUCH OTHER  NOTES AND SHARES  WILL
         BE)] [THESE  SHARES HAVE BEEN]  ACQUIRED  FOR THE ACCOUNT OF THE SELLER
         AND NOT WITH A VIEW TOWARDS, OR FOR RESALE IN CONNECTION WITH, A PUBLIC
         OFFERING AND MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED
         IN  THE  ABSENCE  OF AN  EFFECTIVE  REGISTRATION  STATEMENT  UNDER  THE
         SECURITIES  ACT OR APPLICABLE  STATE  SECURITIES  LAWS, OR AN EXEMPTION
         FROM SUCH  REGISTRATION  OR UNLESS SOLD  PURSUANT TO RULE 144 UNDER THE
         SECURITIES ACT.



<PAGE>


         The legend set forth  above  shall be removed  and Buyer  shall issue a
certificate without such legend to the holder of any Securities upon which it is
stamped, if (i) upon a resale, any such Securities are registered for sale under
the 1933 Act, (ii) in  connection  with a sale  transaction,  upon advice of the
counsel of the holder of such  security,  reasonably  acceptable to Buyer,  such
sale,  assignment  or  transfer  of any of the  Securities  may be made  without
registration  under the 1933 Act,  or (iii)  any of the  Securities  can be sold
pursuant  to Rule 144  without any  restriction  as to the number of  Securities
acquired  as of a  particular  date that can then be  immediately  sold.  Seller
acknowledges,  covenants and agrees to sell any of the Securities represented by
a certificate(s) from which the legend has been removed,  only pursuant to (i) a
registration  statement  effective  under the 1933  Act,  or (ii) a sale that is
exempt from registration required by Section 5 of the 1933 Act. In the event the
above legend is removed from any of the  Securities,  Buyer may, upon reasonable
advance notice to the holder,  require that the above legend be placed on any of
the  Securities  that cannot then be sold pursuant to an effective  registration
statement or Rule 144(k) under the 1933 Act (or any successor rule thereto).

         SECTION 3.23.  Subsidiary. (a) Seller does not, directly or indirectly,
own any stock of, or any other interest in, any Person other than Subsidiary.

          (b) Except as set forth on  Schedule  3.23,  and the pledge to Oaktree
and to  U.S.  Bank  Trust  National  Association  (f/k/a  First  Trust  National
Association)  ("Trustee"),  all of the outstanding capital stock or other voting
securities of Subsidiary is owned by Seller,  directly or  indirectly,  free and
clear of any Lien and free of any other limitation or restriction (including any
restriction  on the right to vote,  sell or  otherwise  dispose of such  capital
stock or other voting  securities).  There are no outstanding  (i) securities of
Seller or  Subsidiary  convertible  into or  exchangeable  for shares of capital
stock or voting  securities  of  Subsidiary  or (ii)  options or other rights to
acquire from Seller or Subsidiary,  or other  obligation of Seller or Subsidiary
to issue, any capital stock, voting securities or securities convertible into or
exchangeable for capital stock or voting  securities of Subsidiary (the items in
clauses  3.23(b)(i)  and  3.23(b)(ii)  being  referred  to  collectively  as the
"Subsidiary Securities"). Seller has no right to repurchase, redeem or otherwise
acquire any outstanding Subsidiary Security.

          (c)   The pledge to Oaktree and to Trustee of the capital stock of
Subsidiary will be discharged on or prior to the Closing Date.

          (d) Upon  payment  by Seller of the  amount  specified  in the  Payoff
Letter:

                  (i) all the  commitments  under the Daiwa Loan  Agreements and
         related  agreements and all  outstanding  loans (together with interest
         thereon) and all other amounts  payable by Seller or  Subsidiary  under
         the Daiwa Loan Agreement and related  agreements shall be paid in full;
         and

                 (ii)  Immediately  prior to its  merger  with and into  Seller,
         Subsidiary  will have no actual or contingent  liabilities  (other than
         payments  owed to Seller),  and will have no assets other than accounts
         receivable purchased from Seller or the proceeds thereof.





<PAGE>


                                    ARTICLE 4

                     REPRESENTATIONS AND WARRANTIES OF BUYER

         Buyer represents and warrants to Seller as of the date hereof and as of
the Closing Date that:

         SECTION 4.1. Corporate Existence and Power. Buyer is a corporation duly
incorporated,  validly  existing and in good standing under the laws of Delaware
and  has  all  corporate   powers  and  all  material   governmental   licenses,
authorizations,  permits,  consents  and  approvals  required  to  carry  on its
business as now  conducted.  Buyer is duly qualified to do business as a foreign
corporation   and  is  in  good  standing  in  each   jurisdiction   where  such
qualification is necessary,  except for those jurisdictions where the failure to
be so  qualified  could  not  reasonably  be  expected,  individually  or in the
aggregate,  to  have a Buyer  Material  Adverse  Effect.  Buyer  has  heretofore
delivered to Seller true and complete copies of its certificate of incorporation
and bylaws as currently in effect.

         SECTION  4.2.  Corporate  Authorization.  The  execution,  delivery and
performance by Buyer of this Agreement and the  Registration  Rights  Agreement,
the Notes and all related  documents and agreements and the  consummation of the
transactions  contemplated hereby and thereby are within the corporate powers of
Buyer and have been duly  authorized  by all necessary  corporate  action on the
part of Buyer.  This  Agreement  constitutes  a valid and binding  agreement  of
Buyer.

         SECTION 4.3. Governmental  Authorization.  The execution,  delivery and
performance by Buyer of this Agreement and the  Registration  Rights  Agreement,
the Notes and all related  documents and agreements and the  consummation of the
transactions  contemplated hereby and thereby require no action by or in respect
of, or filing with, any  Governmental  Authority  other than (i) compliance with
any  applicable  requirements  of the HSR  Act  and  (ii)  compliance  with  any
applicable  requirements  of the 1933 Act and 1934 Act or any  state  securities
laws.

         SECTION 4.4. Noncontravention.  The execution, delivery and performance
by Buyer of this Agreement and the Registration Rights Agreement,  the Notes and
all related  documents and agreements and the  consummation of the  transactions
contemplated  hereby and thereby do not and will not (i) violate the certificate
of incorporation or bylaws of Buyer or (ii) assuming compliance with the matters
referred  to in  Section  4.03,  violate  any  material  applicable  law,  rule,
regulation,  judgment, injunction, order or decree, (iii) assuming the obtaining
of all consents necessary,  constitute a default under or give rise to any right
of  termination,  cancellation  or  acceleration  of,  any  material  agreement,
indenture,  security agreement,  mortgage, lease or other contract or instrument
to which Buyer is a party.



<PAGE>


         SECTION 4.5.  Consents.  Schedule 4.05 lists each agreement,  contract,
lease or other instrument  binding upon Buyer and any Permit requiring a consent
or other  action  by any  Person  as a result  of the  execution,  delivery  and
performance of this Agreement by Buyer, except such consents or actions as could
not reasonably be expected,  individually  or in the aggregate,  to have a Buyer
Material  Adverse Effect if not received or taken by the Closing Date;  provided
that nothing  herein is intended,  or shall be construed,  as a  representation,
warranty or guarantee by Buyer that such consents can or will be obtained  prior
to the Closing.

         SECTION 4.6.  Financing.  Buyer has, or will have immediately  prior to
the Closing,  sufficient  cash,  available  lines of credit or other  sources of
immediately available funds to enable it to make payment of the Cash Amount, the
Second Cash Payment Amount and any other amounts to be paid by it hereunder.

         SECTION 4.7.  Litigation.  There is no action,  suit,  investigation or
proceeding  pending against,  or to the knowledge of Buyer threatened against or
affecting,   Buyer  before  any  Governmental  Authority  or  arbitrator  which,
individually or in the aggregate,  if determined or resolved adversely to Buyer,
could reasonably be expected to have a Buyer Material  Adverse Effect,  or which
otherwise   challenges  or  seeks  to  prevent,   enjoin,  alter  or  delay  the
transactions contemplated by this Agreement.

         SECTION 4.8.  Finders'  Fees.  There is no investment  banker,  broker,
finder or other  intermediary which has been retained by or is authorized to act
on behalf of Buyer who might be  entitled to any fee or  commission  from Buyer,
Seller,  Shareholders  or  any  other  Affiliate  of  Buyer  or  Seller  or  any
Shareholder  upon   consummation  of  the  transactions   contemplated  by  this
Agreement.

         SECTION 4.9. Issuance of Consideration  Shares and Consideration Note .
(a) The  issuance  of the  Consideration  Shares  at the  Closing  has been duly
authorized  on  behalf  of Buyer  and such  Consideration  Shares,  when  issued
pursuant to this Agreement, will be validly issued, fully paid and nonassessable
and will not give rise to any rights of any third  party to  purchase  shares of
capital stock of Buyer pursuant to any preemptive rights.

          (b) The  Consideration  Note  is  duly  authorized  and,  when  issued
pursuant to this Agreement,  will be the legal,  valid and binding obligation of
the Buyer,  enforceable  in accordance  with its terms,  subject to  bankruptcy,
insolvency or similar laws affecting creditor rights generally.  Upon conversion
of all or any portion of any Note in accordance with the terms of such Note, the
Conversion Shares will be validly issued,  fully paid and nonassessable and free
from all taxes,  liens,  claims,  and charges with respect to the issue thereof,
with the holder  being  entitled  to all rights  accorded  to a holder of Common
Stock.



<PAGE>


          (c) No approval of Buyer's  stockholders  (other than  approvals  that
will be obtained  prior to  issuance) is required for the issuance of any of the
Securities under any applicable laws or the rules or regulations of any exchange
on which Securities of Buyer are listed.

         SECTION 4.10. SEC Documents; Financial Statements;  Disclosures. Except
as set forth in Schedule 4.10,  since December 31, 1996,  Buyer has timely filed
all reports,  schedules,  forms,  statements and other documents  required to be
filed by it with the SEC pursuant to the reporting  requirements of the 1934 Act
(all of the  foregoing  filed  prior to the Closing  and all  exhibits  included
therein  and  financial   statements   and   schedules   thereto  and  documents
incorporated  by reference  therein  being  hereinafter  referred to as the "SEC
Documents").  As of their respective  dates,  the SEC Documents  complied in all
material  respects  with the  requirements  of the 1934  Act and the  rules  and
regulations of the SEC promulgated  thereunder  applicable to the SEC Documents,
and  none of the SEC  Documents,  at the  time  they  were  filed  with the SEC,
contained any untrue statement of a material fact or omitted to state a material
fact required to be stated  therein or necessary in order to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.  As of their  respective  dates,  the financial  statements of Buyer
included in the SEC Documents  complied as to form in all material respects with
applicable  accounting  requirements  and the published rules and regulations of
the SEC with respect thereto,  and the financial  statements fairly present,  in
conformity with generally accepted accounting principles applied on a consistent
basis (except as may be indicated in the notes thereto),  the financial position
of Buyer as of the dates  thereof and its results of  operations  and cash flows
for the periods then ended (subject to normal  year-end  adjustments in the case
of any unaudited interim financial statements). No representations or warranties
made by Buyer herein, nor any other written information provided by or on behalf
of Buyer to Seller  which is not  included in the SEC  Documents,  contains  any
untrue  statement  of a  material  fact or  omits  to state  any  material  fact
necessary  in  order  to  make  the  statements  therein,  in the  light  of the
circumstances under which they are or were made, not misleading.

         SECTION  4.11.  No  Integrated  Offering.  Neither Buyer nor any Person
acting on its behalf has,  directly or  indirectly,  made any offers or sales of
any  security  or  solicited  any  offers  to buy any of the  Securities,  under
circumstances  that would require  registration of the Securities under the 1933
Act or  cause  the  issuance  of the  Securities  to be  integrated  with  prior
offerings  by Buyer for purposes of the 1933 Act or any  applicable  stockholder
approval provisions.



<PAGE>


         SECTION 4.12.  Capitalization.  As of the date hereof,  the  authorized
capital stock of Buyer consists of (i)  100,000,000  shares of Common Stock,  of
which as of December 31, 1998, 40,707,673 shares were issued and outstanding and
(ii) 20,000,000  shares of convertible  preferred stock, of which 364,000 shares
of  convertible  preferred  stock  were  issued and  outstanding  as of the date
hereof.  All of such  outstanding  shares have been validly issued and are fully
paid and  nonassessable.  Except as  disclosed  in Schedule  4.12,  no shares of
Common Stock or preferred  stock are subject to  preemptive  rights or any other
similar  rights or any liens or  encumbrances  suffered or  permitted  by Buyer.
Except as  disclosed  in  Schedule  4.12,  as of the date  hereof,  there are no
outstanding  options,  warrants,  scrip,  rights  to  subscribe  for,  calls  or
commitments  of any  character  whatsoever  relating to, or securities or rights
convertible   into,  any  shares  of  capital  stock  of  Buyer,  or  contracts,
commitments,  understandings  or  arrangements  by which  Buyer is or may become
bound to issue additional shares of capital stock of Buyer or options, warrants,
scrip, rights to subscribe for, calls or commitments of any character whatsoever
relating  to, or  securities  or rights  convertible  into any shares of capital
stock of Buyer.

         SECTION  4.13.  Absence of Certain  Changes.  As of the  Closing  Date,
except  as  disclosed  in the SEC  Documents  filed  prior  to the  date of this
Agreement  or expressly  set forth in Schedule  4.13,  since  December 31, 1997,
there has been no event,  occurrence,  or omission that has resulted in or could
reasonably be expected to result in a Buyer Material  Adverse Effect.  Buyer has
not taken any steps,  and does not currently  expect to take any steps,  to seek
protection pursuant to any bankruptcy or other law, statute or judicial or other
proceeding  providing  for the  relief  of  debtors,  nor  does  Buyer  have any
knowledge or reason to believe that its creditors intend to initiate involuntary
bankruptcy proceedings.

         SECTION 4.14.  Title.  Except as disclosed in its SEC Documents,  Buyer
has good and  defensible  title to all real and  personal  property  owned by it
which is material to the  business of Buyer,  free and clear of all Liens except
(a) such as are  described in Schedule  4.14,  (b) such as are for taxes not yet
due or being  contested  in good  faith  (and for  which  adequate  accruals  or
reserves have been  established on the balance sheet included in the most recent
SEC Documents  filed prior to the date of this  Agreement and  identified in the
notes thereto),  or (c) such as do not materially detract from the value of such
property.  Any real property and  facilities  held under lease by Buyer are held
under valid,  subsisting and enforceable  leases with such exceptions as are not
material.

         SECTION  4.15.  Insurance.  Buyer is insured by insurers of  recognized
financial responsibility against such losses and risks and in such amounts as is
prudent and customary in the businesses in which Buyer is engaged.  Buyer has no
reason  to  believe  that it will not be able to renew  its  existing  insurance
coverage as and when such coverage  expires or to obtain  similar  coverage from
similar  insurers as may be  necessary  to continue  its business at a cost that
could not reasonably be expected to have a Buyer Material Adverse Effect.



<PAGE>


         SECTION  4.16.  Permits.  Buyer  possesses  all  Permits  issued by the
appropriate  Governmental  Authorities  necessary to conduct its  business,  and
Buyer has not received any notice of  proceedings  relating to the revocation or
modification of any material such Permit.  To Buyer's  knowledge,  no condition,
event,  occurrence  or  omission  exists  that  would  cause the  revocation  or
modification  of any such Permit,  except where such  revocation or modification
could not reasonably be expected to have a Buyer Material Adverse Effect.

         SECTION  4.17.  Compliance  with Laws and Court  Orders.  Except as set
forth in Schedule  4.17,  4.18 or disclosed in the SEC Documents  filed prior to
the date of this Agreement, Buyer is not in violation of, has not since November
8, 1996 violated,  and to the knowledge of Buyer is not under investigation with
respect to and has not been threatened to be charged with or given notice of any
violation  of,  any  applicable  material  law,  rule,   regulation,   judgment,
injunction, order or decree.

         SECTION 4.18.  Patient Refund Policy.  The patient refund policy set
forth on Schedule 2.11 accurately describes in all material respects the
patient refund policy of Buyer.



                                    ARTICLE 5

                               COVENANTS OF SELLER

         Seller agrees that:

         SECTION 5.1.  Conduct of the  Business.  From the date hereof until the
Closing Date,  Seller and Subsidiary  shall conduct the Business in the ordinary
course consistent with past practice and shall use their respective best efforts
to preserve  intact the  business  organizations  and  relationships  with third
parties and to keep  available  the  services of the  present  employees  of the
Business.  Without limiting the effect of the foregoing, Buyer acknowledges that
the Seller has advised the Buyer that Seller may commence proceedings under laws
for the relief of debtors.  Without  limiting the  generality of the  foregoing,
from the date hereof until the Closing Date, neither Seller nor Subsidiary will:

                  (a) acquire a material amount of assets from any other Person,
         except that the Subsidiary may acquire accounts  receivable from Seller
         in the ordinary  course  consistent  with past  practice and Seller may
         receive additional advances or loans from Oaktree;

                  (b) sell, lease, license or otherwise dispose of any assets or
         properties except (i) pursuant to existing contracts or commitments and
         (ii) in the ordinary course consistent with past practice;

                  (c)    agree or commit to do any of the foregoing; or



<PAGE>


                  (d) (i) take or agree or commit to take any action  that would
         make any  representation or warranty of Seller hereunder  inaccurate in
         any  material  respect at, or as of any time prior to, the Closing Date
         or (ii) omit or agree or commit to omit to take any action necessary to
         prevent any such  representation  or warranty from being  inaccurate in
         any material  respect at any such time;  provided that Seller's receipt
         of  additional  advances or loans from  Oaktree  shall not be deemed to
         constitute a violation of this Section 5.01(d).

         SECTION 5.2. Access to Information;  Confidentiality. (a) From the date
hereof until the Closing Date other than as provided in Section 5.07, Seller and
Subsidiary  will (i) give Buyer and its  authorized  Representatives  reasonable
access to the offices,  properties,  books and records of Seller and  Subsidiary
relating  to  the   Business,   (ii)   furnish  to  Buyer  and  its   authorized
Representatives such financial and operating data and other information relating
to the Business as any such Person may reasonably request and (iii) instruct the
employees,  counsel and financial advisors of Seller and Subsidiary to cooperate
with Buyer in its investigation of the Business.  Any investigation  pursuant to
this Section shall be conducted in such manner as not to interfere  unreasonably
with the conduct of the business of Seller and Subsidiary.  No  investigation by
Buyer or other  information  received  by Buyer  shall  operate  as a waiver  or
otherwise  affect any  representation,  warranty or  agreement  given or made by
Seller hereunder.

          (b) After the Closing, Seller will hold, will cause Subsidiary to hold
and will use its best efforts to cause their respective Representatives to hold,
in  confidence,  unless  compelled  to disclose  by  judicial or  administrative
process  or by  other  requirements  of  law,  all  confidential  documents  and
information concerning the Business,  except to the extent that such information
can be shown to have been (i) in the public domain through no fault of Seller or
Subsidiary  or (ii) later  lawfully  acquired by Seller from sources  other than
those related to its prior  ownership of the Business.  The obligation of Seller
to hold any such  information  in confidence  shall be satisfied if it exercises
the same care with respect to such  information as it would take to preserve the
confidentiality of its own similar information.

         (c) On and after the Closing Date,  Seller will afford to Buyer and its
agents  reasonable  access to its books of account,  financial and other records
(including,   without  limitation,   accountant's  work  papers),   information,
employees and auditors to the extent necessary or useful for Buyer in connection
with any audit,  investigation,  dispute or litigation  or any other  reasonable
business  purpose  relating  to  the  Business.  Buyer  shall  bear  all  of the
out-of-pocket  costs and expenses  (including,  without  limitation,  attorneys'
fees, but excluding  reimbursement for general  overhead,  salaries and employee
benefits) reasonably incurred in connection with the foregoing.

         (d) Seller shall, and cause its  representatives  to, continue to abide
by the terms of the Buyer Non-Disclosure Agreement.



<PAGE>


         SECTION 5.3.  Permits.  If the Transferred  Permits,  if any, cannot be
transferred  by Seller to Buyer  without the  approval  of or other  action by a
Governmental Authority, Seller shall file such notices and applications as Buyer
shall  reasonably  request to  effectuate  the  transfer of such  Permits to, or
reissuance  of such  Permits  in the name of,  the  Buyer  and  shall  otherwise
cooperate  with Buyer to secure  such  transfer  or  reissuance;  provided  that
nothing herein is intended, or shall be construed, as a representation, warranty
or guarantee by Seller that such transfers or  reissuances  shall be approved or
effected by any Governmental Authority prior to or after the Closing.

         SECTION 5.4.  Notices of Certain Events.  Seller shall promptly notify
         Buyer of:

                  (a) any notice or other communication from any Person alleging
         that the consent of such  Person is or may be  required  in  connection
         with the transactions contemplated by this Agreement;

                  (b) any notice or other  communication  from any  Governmental
         Authority in  connection  with the  transactions  contemplated  by this
         Agreement;

                  (c) any actions, suits, claims,  investigations or proceedings
         commenced  or, to its  knowledge  threatened  against,  relating  to or
         involving or otherwise  affecting  Seller,  Subsidiary  or the Business
         that,  if  pending  on the  date of this  Agreement,  would  have  been
         required to have been disclosed pursuant to Section 3.10 or that relate
         to the consummation of the transactions contemplated by this Agreement;
         and

                  (d) the damage or destruction by fire or other casualty of any
Purchased Asset or part thereof.



<PAGE>


         SECTION 5.5. No Shopping or  Disclosure.  From the date hereof  through
and until the  earlier  to occur of the date that is eighty  days after the date
hereof and the date of termination of this Agreement  pursuant to Section 12.01,
(a) Seller shall not,  Seller shall not permit  Subsidiary  to, and Seller shall
use its best efforts to cause their respective  Representatives to not, directly
or indirectly,  (i) solicit, initiate or encourage any inquiries,  proposals, or
offers from any Person relating to any acquisition,  directly or indirectly,  of
the Purchased Assets,  the Business or any material asset that is intended to be
a  Purchased  Asset,  or any  securities  of, or any  merger,  consolidation  or
business  combination with Seller or Subsidiary (any such potential  transaction
other  than  with  Buyer,  an  "Acquisition  Transaction"),   (ii)  provide  any
confidential  information  or data to any  Person  relating  to any  Acquisition
Transaction or (iii) have any discussions or engage in any negotiations with any
Person relating to any Acquisition Transaction;  and (b) if Seller shall receive
any inquiry,  proposal or offer of the type  described  above or any request for
any such confidential information,  discussions or negotiations (x) Seller shall
promptly  provide Buyer with written  notification  of such  inquiry,  proposal,
offer or request,  which  notification shall include the terms and conditions of
any such offer or proposal and any other information relevant thereto, including
any written or other material available to Seller in connection  therewith,  and
(y) Seller shall advise the Person  contacting Seller that it has no interest at
this time in discussing or  responding to any such inquiry,  proposal,  offer or
request. Upon the effectiveness of this Agreement,  this Section 5.05 supercedes
the  Exclusivity  Agreement  and the  Exclusivity  Agreement  is  terminated  as
provided in Section 13.09.

         SECTION  5.6.  Tail  Insurance.  Seller  shall,  at its  sole  cost and
expense,  obtain and keep in full force and effect tail  insurance that complies
with the representations contained in Section 3.15 covering errors and omissions
including,  without  limitation,  malpractice  claims,  directors  and  officers
insurance and other  professional  claims,  relating to the conduct by Seller or
Subsidiary  of the  Business  prior to the Closing and provide  evidence of such
insurance to Buyer.

         SECTION 5.7.  Customer  List.  No later than one Business Day after the
date  when any  applicable  waiting  period  under the HSR Act  relating  to the
transactions  contemplated hereby shall have expired or been terminated,  Seller
shall provide Buyer with the Customer List.

         SECTION 5.8. Audited Financial  Statements.  If the Closing Date occurs
at any time on or after May 18,  1999,  Seller shall  deliver,  as soon as it is
able and in any  event no later  than the date  which is sixty  days  after  the
Closing Date,  audited  financial  statements for the fiscal year ended February
28,  1999,  certified  by Grant  Thornton,  LLP or other  nationally  recognized
accounting  firm  reasonably  acceptable to Buyer. If the Closing Date occurs at
any time prior to May 18, 1999, Seller shall deliver,  as soon as it is able and
in any event no later than the date which is sixty days after the Closing  Date,
unaudited financial statements for the nine months ended November 30, 1998, in a
consistent format with the audited financials of the prior year.



<PAGE>


         SECTION 5.9.  HSR Act.  Seller shall use its best efforts to timely and
promptly make all filings which are required to be made by it under the HSR Act,
including  making the initial  filing  within two  Business  Days after the date
hereof.  Seller shall furnish to Buyer such necessary information and reasonable
assistance  as Buyer may  reasonably  request  in  connection  with the  Buyer's
preparation of any filings necessary under the provisions of the HSR Act. Seller
shall  supply Buyer with copies of, and Buyer shall have the right to review and
comment  on  the  form  and  substance  of,  all   correspondence,   filings  or
communications (or memoranda setting forth the substance thereof) between Seller
or its counsel,  on the one hand, and the Federal Trade  Commission (the "FTC"),
the  Antitrust  Division  of  the  United  States  Department  of  Justice  (the
"Antitrust  Division") or any other  Governmental  Authority or members of their
respective  staffs,  on the other hand,  with respect to this  Agreement and the
transactions   contemplated  hereby;  provided  that  Seller  may  refrain  from
providing such  information to Buyer if it in good faith determines that sharing
such  confidential  business  information  (e.g.  business  plans  or  valuation
methods) would be  detrimental  to Seller.  Seller shall respond to any requests
from the FTC or Antitrust Division as promptly as practicable.

         SECTION 5.10. Patient Refund Policy. Between the date of this Agreement
and the Closing  Date,  Seller shall  continue  its stated  practice of promptly
processing  and paying all valid Patient  Refunds when such requests are brought
to Seller's attention.  Further,  Seller shall process and pay any and all other
requests for refunds in a manner that will  preclude any  reduction or offset on
any receivable or the proceeds of any receivable.

         SECTION  5.11.  Resignations.  Seller  shall  notify  Buyer  within one
Business Day in the event that an officer,  senior management executive or sales
personnel  has given  notice to the CEO of  Seller of an actual  resignation  or
retirement, or any intended date of resignation or retirement. The CEO of Seller
shall make a weekly inquiry in order to determine whether Seller's sales manager
has received any such notice.



                                    ARTICLE 6

                               COVENANTS OF BUYER

         Buyer agrees that:

         SECTION 6.1. Representations and Warranties. From the date hereof until
the Closing Date, Buyer will not take or agree or commit to take any action that
would make any  representation or warranty of Buyer hereunder  inaccurate in any
material  respect  at, or as of any time prior to, the  Closing  Date or omit or
agree or  commit  to omit to take  any  action  necessary  to  prevent  any such
representation  or warranty from being inaccurate in any material respect at any
such time.



<PAGE>


         SECTION 6.2.  Confidentiality.  Prior to the Closing Date and after any
termination of this  Agreement,  subject to the  requirements of applicable law,
Buyer shall,  and shall cause its  Representatives  to, continue to abide by the
terms of the Seller Non-Disclosure Agreement; provided that Seller acknowledges,
and  paragraph 2 of the Seller  Non-Disclosure  Agreement  is hereby  amended to
provide,  that from and after the date hereof, Buyer and its Representatives may
use the  Evaluation  Materials  (as  defined  therein)  in  connection  with the
consummation of the transactions contemplated by this Agreement and its internal
preparation  for its ownership  and  operation of the  Purchased  Assets and the
Business  and its  assumption  of the  Assumed  Liabilities  from and  after the
Closing Date. On and after the Closing Date, the Seller Non-Disclosure Agreement
shall  remain in full force and  effect in  accordance  with and  subject to its
terms  solely with  respect to  Evaluation  Materials  that do not relate to the
Purchased  Assets,  the  Assumed  Liabilities  or the  Business,  and the Seller
Non-Disclosure Agreement shall otherwise be terminated on the Closing Date.

         SECTION 6.3.  Access.  On and after the Closing Date, Buyer will afford
Seller and its  authorized  Representatives  reasonable  access to its officers,
properties, books, records, employees and auditors to the extent relating to the
Business and  necessary to permit  Seller to  determine  any matter  relating to
their respective rights and obligations  hereunder or to any period ending on or
before the Closing  Date,  and instruct its  Representatives  to cooperate  with
Seller  in  connection  therewith;  provided  that any  such  access  shall  not
unreasonably  interfere with the conduct of the Business of Buyer.  Seller shall
bear all of the out-of-pocket costs and expenses (including, without limitation,
attorneys' fees, but excluding reimbursement for general overhead,  salaries and
employee benefits) reasonably incurred in connection with the foregoing.  Seller
will hold, and will use its best efforts to cause its  Representatives  to hold,
in  confidence,  unless  compelled  to disclose  by  judicial or  administrative
process  or by  other  requirements  of  law,  all  confidential  documents  and
information provided to it pursuant to this Section.

         SECTION  6.4.  Reservation  of  Shares.  Buyer  shall  take all  action
necessary  at all times to have  authorized,  and  reserved  for the  purpose of
issuance,  no less than the number of shares of Common  Stock  needed to provide
for the issuance of the Conversion Shares upon such conversion.

         SECTION  6.5.  Financial  Information.  Buyer  agrees to send to Seller
during the period  that  Seller  holds any Note:  (i) within five days after the
filing  thereof  with the SEC,  a copy of its Annual  Reports on Form 10-K,  its
Quarterly  Reports  on Form  10-Q,  any  Current  Reports  on Form 8-K,  and any
registration  statements  or  amendments  filed  pursuant to the 1933 Act;  (ii)
within one (1) day after release thereof, copies of all press releases issued by
Buyer; (iii) copies of any notices and other information made available or given
to the  stockholders  of Buyer  generally,  contemporaneously  with  the  making
available of or giving thereof to the stockholders.



<PAGE>


         SECTION  6.6.  HSR Act.  (a) Buyer shall use its best efforts to timely
and promptly  make all filings which are required to be made by it under the HSR
Act,  including  making the initial  filing within two Business Days of the date
hereof. Buyer shall furnish to Seller such necessary  information and reasonable
assistance  as  Seller  may  reasonably  request  in  connection  with  Seller's
preparation of any filings  necessary under the provisions of the HSR Act. Buyer
shall supply Seller with copies of all correspondence, filings or communications
(or memoranda setting forth the substance thereof) between Buyer or its counsel,
on the one hand, and the FTC, the Antitrust  Division or any other  Governmental
Authority or members of their respective staffs, on the other hand, with respect
to this Agreement and the transactions  contemplated hereby; provided that Buyer
may  refrain  from  providing  such  information  to Seller if it in good  faith
determines that sharing such confidential  business  information (e.g.  business
plans or valuation  methods) would be detrimental to Buyer.  Buyer shall respond
to any requests from the FTC or Antitrust Division as promptly as practicable.

          (b) Buyer shall pay the filing fee payable under the HSR Act.

         SECTION 6.7.  Notices of Certain Events.  Buyer shall promptly notify
Seller of:

          (a) any notice or other  communication  from any Person  alleging that
the  consent  of such  Person  is or may be  required  in  connection  with  the
transactions contemplated by this Agreement;

          (b) any notice or other communication from any Governmental  Authority
in connection with the transactions contemplated by this Agreement; and

          (c)  any  actions,   suits,  claims,   investigations  or  proceedings
commenced or, to its knowledge  threatened against,  relating to or involving or
otherwise affecting Buyer that, if pending on the date of this Agreement,  would
have been  required  to have been  disclosed  pursuant  to Section  4.07 or that
relate to the consummation of the transactions contemplated by this Agreement.

         SECTION 6.8.  American Stock Exchange.  As of the Closing Date, Buyer
shall have made all filings, if any, required to be made by it under the
American Stock Exchange rules.



                                    ARTICLE 7

                          COVENANTS OF SELLER AND BUYER

         Seller and Buyer agree that:



<PAGE>


         SECTION 7.1. Efforts; Further Assurances.  (a) Subject to the terms and
conditions  of this  Agreement,  Buyer and  Seller  each  agrees to use its best
efforts to take,  or cause to be taken,  all  actions  and to do, or cause to be
done, all things necessary or desirable under applicable laws and regulations to
consummate the  transactions  contemplated by this  Agreement.  Buyer and Seller
each  agrees  to  execute  and  deliver  such  other  documents,   certificates,
agreements and other writings and to take such other actions as may be necessary
or desirable in order to consummate or implement  expeditiously the transactions
contemplated by this Agreement and to vest in Buyer good and defensible title to
the Purchased Assets, in form and substance  reasonably  acceptable to Buyer and
Seller.  Buyer  and  Seller  each  agrees to use its best  efforts  to cause the
conditions set forth in Section 10.01 to be satisfied,  Seller agrees to use its
best efforts to cause the conditions set forth in Section 10.02 to be satisfied,
and Buyer  agrees to use its best efforts to cause the  conditions  set forth in
Section 10.03 to be satisfied,  in each case within five Business Days after the
date  when any  applicable  waiting  period  under the HSR Act  relating  to the
transactions contemplated hereby shall have expired or been terminated.

          (b) Subject to the terms and conditions of this  Agreement,  Buyer and
Seller each  agrees to use its best  efforts to  cooperate  in ensuring a smooth
transition  in ownership of the  Purchased  Assets and the  Business,  including
without  limitation  jointly holding employee  meetings,  preparing to integrate
computer systems,  increasing Buyer's  familiarity with Seller's  facilities and
practices and jointly providing  communications  with employees,  suppliers and,
subject to Seller's  prior approval  which shall not be  unreasonably  withheld,
customers.

          (c)  Seller  hereby  constitutes  and  appoints,  effective  as of the
Closing  Date,  Buyer and its  successors  and  assigns  as the true and  lawful
attorney of Seller with full power of  substitution  in the name of Buyer, or in
the name of Seller but for the benefit of Buyer,  (i) to collect for the account
of Buyer any items of Purchased  Assets and (ii) to institute  and prosecute all
proceedings  which  Buyer  may in its sole  discretion  deem  proper in order to
assert or enforce  any right,  title or interest  in, to or under the  Purchased
Assets, and to defend or compromise any and all actions, suits or proceedings in
respect of the Purchased  Assets.  Buyer shall be entitled to retain for its own
account any amounts collected  pursuant to the foregoing  powers,  including any
amounts payable as interest in respect thereof.

         (d) If Seller  becomes  aware of any assets of Seller  that should have
been  transferred to Buyer under Section 2.01 but were not  transferred  because
such assets were omitted from any of the Schedules described under Section 3.09,
3.12(a) or 3.12(b),  Seller shall promptly notify Buyer of the existence of such
asset which should have been  transferred  to Buyer.  If Buyer  notifies  Seller
within sixty days of the Closing Date of any asset that had Seller disclosed the
existence  of such asset,  such asset would have been a  Purchased  Asset,  then
Seller  shall use its best  efforts  to  promptly  deliver  such asset to Buyer,
without  requiring  any  additional  consideration  therefor.  Buyer and  Seller
acknowledge  and  agree  that any  such  assets  are  intended  to be and  shall
constitute  Purchased  Assets  hereunder,  and the Purchase Price paid hereunder
constitutes  good  and  sufficient   consideration  for  all  Purchased  Assets,
including any such assets  delivered after the Closing Date. Until so delivered,
the same shall be held in trust by Seller as property of Buyer.



<PAGE>


         SECTION  7.2.  Certain  Filings.  Seller  and  Buyer  shall  reasonably
cooperate  with one  another  (i) in  determining  whether  any  action by or in
respect of, or filing with,  any  Governmental  Authority  is  required,  or any
actions, consents, approvals or waivers are required to be obtained from parties
to any Leases and Material Contracts, in connection with the consummation of the
transactions  contemplated  by this Agreement and (ii) in taking such actions or
making any such filings, furnishing information required in connection therewith
and seeking timely to obtain any such actions, consents, approvals or waivers.

         SECTION 7.3.  Public  Announcements.  The parties agree to provide each
other with any press  release  relating to this  Agreement  or the  transactions
contemplated  hereby  prior to issuance  and to consult  with each other in good
faith before issuing any such press release or making any public  statement with
respect to this Agreement or the transactions contemplated hereby and, except as
may be required by  applicable  law or any listing  agreement  with any national
securities  exchange,  will not issue any such  press  release  or make any such
public  statement prior to utilizing their  respective best efforts to have such
consultation.

         SECTION 7.4. No Solicitation of Employees.  Buyer and Seller each agree
that,  (a) during the period from and after the date hereof until the earlier of
the Closing Date and the date that this  Agreement is  terminated  in accordance
with Section  12.01,  unless it obtains the consent of the other party,  it will
not offer to employ or employ any officer or senior management  executive of the
other  party,  so long as any such officer or executive is employed by the other
party, (b) during the period from and after the date hereof until the earlier of
the  Closing  Date and the date  that is six  months  after  the date  when this
Agreement is terminated in accordance with Section 12.01,  unless it obtains the
consent of the other party, none of its officers,  senior management  executives
or managers will  directly or indirectly  solicit to employ any employees of the
other party. The term "solicit to employ" does not include general solicitations
of employment not specifically directed toward employees of the other party.



<PAGE>


         SECTION 7.5. No Solicitation of Customers. During the period commencing
on the date hereof  until the  earlier of the Closing  Date and the date that is
(A) if Buyer has not received the  Customer  List,  three months or (B) if Buyer
has received the Customer  List, or with respect to any Customer with whom sales
personnel of Buyer and Seller have made a joint sales call, six months after the
date when this Agreement is terminated for any reason in accordance with Section
12.01,  unless it obtains  the prior  consent of Seller,  neither  Buyer nor its
Representatives  shall,  directly  or  indirectly,  in  any  manner  whatsoever,
including without  limitation by the use of the Customer List or any information
contained therein,  (a) initiate  communications of any kind with any Person who
is identified  with  specificity on the Customer List (if Buyer has received the
Customer  List),  or (b) solicit,  persuade,  entice,  encourage,  or induce any
Person  who is then a  customer  of Seller to become a  customer  of Buyer or to
terminate such Person's  relationship  with Seller with respect to such Person's
purchase of medical laboratory  services,  or (c) assist any Person to do any of
the  foregoing;  provided  that Buyer and Seller  shall  cooperate  in  advising
Seller's clients of the transaction and in preparing  customers for an effective
and efficient  transition  unless and until this Agreement is terminated for any
reason in accordance with Section 12.01; and provided further that a response by
Buyer to a general request for proposal or bid by a customer shall not be deemed
to be an initiation of communication or a solicitation,  persuasion, enticement,
encouragement  of inducement of such customer to become a customer of Buyer,  so
long as such response is consistent with Section 6.02.

         SECTION 7.6.  Provider Numbers. Buyer and Seller shall take all
actions and timely file all notices as may be necessary in order for Buyer to
reject acceptance of Seller's Medicare provider numbers.

         SECTION  7.7.  Phlebotomy  Locations.  Buyer and Seller shall use their
respective  reasonable  efforts to obtain  prior to the Closing Date an executed
lease and  technical  services  agreement  with respect to each of the physician
office  locations  listed on Schedule 7.07 between the  applicable  physician or
medical group and Buyer. Each such lease and technical  services agreement shall
be effective as of the Closing Date.



                                    ARTICLE 8

                                   TAX MATTERS

         SECTION 8.1.  Tax Definitions.  The following terms, as used herein,
have the following meanings:

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Pre-Closing  Tax Period"  means (i) any Tax period ending on or before
the Closing Date and (ii) with respect to a Tax period that commences before but
ends after the Closing Date,  the portion of such period up to and including the
Closing Date.

         "Tax"  means (i) any net income,  alternative  or add-on  minimum  tax,
gross income,  gross receipts,  sales, use, ad valorem,  value added,  transfer,
franchise, profits, license, registration, recording, documentary, conveyancing,
gains, withholding on amounts paid to or by Seller, payroll, employment, excise,
severance,  stamp,  occupation,  premium,  property,  environmental  or windfall
profit tax, custom duty or other tax,  governmental fee or other like assessment
or charge of any kind whatsoever,  together with any interest, penalty, addition
to tax or additional  amount  imposed by any  governmental  authority (a "Taxing
Authority") responsible for the imposition of any such tax (domestic or foreign)
or (ii) liability for the payment of any amounts of the type described in (i) as
a result of being party to any agreement or any express or implied obligation to
indemnify any other Person.

        SECTION 8.2. Tax Matters. Seller represents and warrants to Buyer that:



<PAGE>


                  (a)  Except  as  set  forth  in  Schedule  8.02,   Seller  and
         Subsidiary  have timely paid all Taxes,  and all interest and penalties
         due thereon and payable by Seller and  Subsidiary  for the  Pre-Closing
         Tax Period which will have been  required to be paid on or prior to the
         Closing Date, the  non-payment of which  (including  Taxes set forth in
         Schedule  8.02) would result in a Lien on any  Purchased  Asset,  would
         otherwise  adversely  affect  the  Business  or would  result  in Buyer
         becoming liable or responsible therefor.

                  (b) Seller and Subsidiary have established, in accordance with
         generally accepted accounting  principles applied on a basis consistent
         with that of preceding  periods,  adequate reserves for the payment of,
         and will  timely pay all Tax  liabilities,  assessments,  interest  and
         penalties  which are incurred in or attributable to the Pre-Closing Tax
         Period,  the  non-payment  of  which  would  result  in a  Lien  on any
         Purchased Asset, would otherwise adversely affect the Business or would
         result in Buyer becoming liable therefor.

                  (c)  Seller is not a  "foreign  person"  as defined in Section
         1445 of the Code.

         SECTION 8.3. Tax Cooperation; Allocation of Taxes. (a) Buyer and Seller
agree to  furnish or cause to be  furnished  to each  other,  upon  request,  as
promptly  as  practicable,  such  information  and  assistance  relating  to the
Business and the Purchased  Assets  (including,  without  limitation,  access to
books and records) as is reasonably necessary for the filing of all Tax returns,
the making of any election  relating to Taxes,  the preparation for any audit by
any taxing  authority,  and the  prosecution  or  defense of any claim,  suit or
proceeding  relating  to any Tax.  Buyer and Seller  shall  retain all books and
records  with  respect to Taxes  pertaining  to the  Purchased  Assets until the
expiration of the applicable statute of limitations.  At the end of such period,
each party shall provide the other with at least ten days prior  written  notice
before  destroying  any such books and  records,  during  which period the party
receiving such notice can elect to take possession,  at its own expense, of such
books and  records.  Seller  and Buyer  shall  cooperate  with each other in the
conduct  of any  audit or other  proceeding  relating  to  Taxes  involving  the
Purchased Assets or the Business.



<PAGE>


          (b) All real property  taxes,  personal  property taxes and similar ad
valorem  obligations  levied with respect to the Purchased  Assets for a taxable
period which includes (but does not end on) the Closing Date (collectively,  the
"Apportioned  Obligations")  shall be apportioned between Seller and Buyer based
on the number of days of such taxable  period  included in the  Pre-Closing  Tax
Period and the number of days of such  taxable  period  after the  Closing  Date
(with respect to any such taxable period, the "Post-Closing Tax Period"). Seller
shall be liable for the proportionate  amount of such taxes that is attributable
to the Pre-Closing Tax Period,  and Buyer shall be liable for the  proportionate
amount of such taxes that is attributable to the Post-Closing  Tax Period.  Upon
receipt  of any  bill  for  real or  personal  property  taxes  relating  to the
Purchased  Assets,  each of Seller and Buyer shall  present a  statement  to the
other setting forth the amount of  reimbursement to which each is entitled under
this Section  8.03(b)  together with such  supporting  evidence as is reasonably
necessary to calculate the proration amount.  The proration amount shall be paid
by the party  owing it to the  other  within  ten days  after  delivery  of such
statement.  In the event that either  Seller or Buyer shall make any payment for
which it is entitled to  reimbursement  under this  Section  8.03(b),  the other
party shall make such reimbursement promptly but in no event later than ten days
after the presentation of a statement  setting forth the amount of reimbursement
to which the presenting party is entitled along with such supporting evidence as
is reasonably necessary to calculate the amount of reimbursement.

          (c)  All  excise,   sales,  use,  value  added,   registration  stamp,
recording,  documentary,  conveyancing,  franchise, transfer, and similar Taxes,
levies, charges and fees (collectively, "Transfer Taxes") incurred in connection
with the transfer to Buyer of the Purchased  Assets and Assumed  Liabilities  as
contemplated  by this  Agreement  shall be  borne  50% by the  Buyer  and 50% by
Seller.  Buyer and  Seller  shall  cooperate  in  providing  each other with any
appropriate resale exemption certifications and other similar documentation. The
party that is  required  by  applicable  law to make the  filings,  reports,  or
returns with respect to any applicable Transfer Taxes shall do so, and the other
party shall cooperate with respect thereto as necessary.



                                    ARTICLE 9

                                EMPLOYEE BENEFITS

         SECTION 9.1.  Employee Benefits Definitions.  The following terms, as
used in, have the following meanings:

         "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

         "ERISA Affiliate" of any entity means any other entity which,  together
with such entity, would be treated as a single employer under Section 414 of the
Code.

         "Multiemployer  Plan" means each Employee Plan that is a  multiemployer
plan, as defined in Section 3(37) of ERISA.

         "PBGC" means the Pension Benefit Guaranty Corporation.

         SECTION  9.2.  ERISA  Representations.  Seller  hereby  represents  and
warrants to Buyer as of the date hereof and the Closing Date that:



<PAGE>


                  (a) Schedule  9.02(a) lists each "employee  benefit plan",  as
         such term is defined in Section 3(3) of ERISA,  which (i) is subject to
         any provision of ERISA, (ii) is maintained, administered or contributed
         to by Seller or any  Affiliate  of Seller and (iii) covers any employee
         of  Seller  (hereinafter  referred  to  collectively  as the  "Employee
         Plans").  Subsidiary  has no and has not had any  Employee  Plan.  With
         respect to each  Employee  Plan,  Seller has made  available to Buyer a
         true and complete copy of such plan  document,  the most recently filed
         Form 5500 and an accurate summary description of such plan.

                  (b) No  Employee  Plan is a  Multiemployer  Plan,  and neither
         Seller nor any of Seller's  ERISA  Affiliates  maintains or contributes
         to, or has  maintained  or  contributed  to, for a period of five years
         preceding the date hereof,  any employee  benefit plan subject to Title
         IV of ERISA.  Neither Seller nor any of Seller's  ERISA  Affiliates has
         incurred any  liability  under Title IV of ERISA  arising in connection
         with the termination of any plan covered or previously covered by Title
         IV of ERISA that could become, after the Closing Date, an obligation of
         Buyer or any of its Affiliates.

                  (c)  Schedule  9.02(c)  includes  a list of  each  employment,
         severance or other similar contract,  arrangement or policy (written or
         oral) and each plan or  arrangement  (written  or oral)  providing  for
         insurance coverage (including any self-insured arrangements),  workers'
         compensation,  disability benefits, supplemental unemployment benefits,
         vacation benefits,  retirement  benefits or for deferred  compensation,
         profit-sharing,  bonuses,  stock options,  stock  appreciation or other
         forms  of  incentive   compensation   or   post-retirement   insurance,
         compensation  or benefits  which (i) is not an Employee  Plan,  (ii) is
         entered  into,  maintained  or  contributed  to, as the case may be, by
         Seller or any  Affiliate  of Seller and (iii)  covers any  employee  of
         Seller. Such contracts,  plans and arrangements as are described above,
         copies or  descriptions  of all of which  have been made  available  or
         furnished  previously to Buyer are hereinafter referred to collectively
         as the "Benefit  Arrangements."  Subsidiary  has no and has not had any
         Benefit  Arrangements.  Each Benefit Arrangement has been maintained in
         substantial  compliance  with  its  terms  and  with  the  requirements
         prescribed by any and all statutes, orders, rules and regulations which
         are applicable to such Benefit Arrangement.

                  (d) The  Purchased  Assets are not now nor will they after the
         passage  of time be  subject to any Lien  imposed  under  Code  Section
         412(n) by reason of the failure of Seller or any Affiliate of Seller to
         make timely  installments  or other  payments  required by Code Section
         412.



<PAGE>


                  (e)  No  Transferred  Employee  will  become  entitled  to any
         retirement,  severance or similar benefit or enhanced benefit solely as
         a  result  of  the  transactions   contemplated  hereby.

         SECTION  9.3.  Employees and Offers of Employment.

          (a) The parties  acknowledge  that Buyer shall have no
liability or obligation whatsoever with respect to Employee Liabilities, nor
shall Buyer have any obligation to provide any employee  benefits to any
employees  other than as set forth in Sections  2.03(e),  2.03(g) and 9.03(b);
and  provided  that Buyer shall have the liabilities and be responsible for
Employee Liabilities with respect to Transferred Employees incurred by Buyer
after the Closing Date.

          (b) Buyer intends to offer  employment to certain  employees of Seller
effective as of the Closing,  on such terms and conditions  (including length of
employment) as Buyer may, in its sole discretion,  determine (any such employees
who accept Buyer's offer of employment  and actually  commence  employment  with
Buyer are referred to herein as "Transferred Employees"), but Buyer shall not be
under any  obligation to hire any or all employees or any  particular  employees
under this Agreement or for any other reason. Buyer shall assume  responsibility
for any  Transferred  Employee  as of the  Closing.  For a  period  of one  year
following  the  Closing,   Buyer  will  provide  compensation  and  benefits  to
Transferred  Employees no less favorable in the aggregate than those provided to
similarly  situated  employees of Buyer.  Prior to the Closing,  upon reasonable
prior notice to Seller, Buyer may make joint communications with Seller with any
of the employees currently employed in the Business.

          (c) Subject to applicable  legal  restrictions,  prior to the Closing,
Seller shall provide to Buyer,  in a timely  manner,  any  applicable  personnel
records and information  which Buyer may reasonably  request with respect to any
employee of Seller.  Seller shall not in any way participate in Buyer's decision
to hire or not to hire any employee of Seller.

         SECTION 9.4. Seller's Employee Benefit Plans. (a) General. Seller shall
retain all  obligations  and  liabilities  under the Employee  Plans and Benefit
Arrangements  or  otherwise  in  respect  of each  employee  or former  employee
(including any beneficiary thereof) who is not a Transferred Employee. Except as
expressly set forth herein, Seller or its designated Affiliates shall retain all
liabilities  and  obligations  in respect of benefits  accrued as of the Closing
Date by Transferred  Employees under the Employee Plans and Benefit Arrangements
and any  other  employment-related  liability  related  to  employees  of Seller
resulting  from actions  arising  prior to or on the Closing  Date,  and neither
Buyer nor any of its Affiliates  shall have any liability with respect  thereto.
Except as expressly set forth herein,  no assets of any Employee Plan or Benefit
Arrangement  shall be  transferred  to Buyer or any of its  Affiliates or to any
plan of Buyer or any of its Affiliates.



<PAGE>


          (b)  Seller's  Defined  Contribution  Plans.  (i)  Effective as of the
Closing Date, Seller shall amend each of the defined contribution plans in which
Transferred  Employees  participate  (the "Seller  Savings  Plans") to cause the
account balances of each Transferred  Employee  thereunder to become 100% vested
as of the Closing Date.

         (ii) Seller shall take any steps  necessary  to permit the  Transferred
Employees to receive a distribution  of their accrued  benefits from each of the
Seller  Savings  Plans  as a result  of the  transactions  contemplated  by this
Agreement;  provided the terms of those plans and  applicable  provisions of the
Code would permit such a  distribution.  On or following the Closing  Date,  the
savings plan of Buyer or one of its Affiliates  (the "Buyer DC Plans") shall (if
elected  by  Transferred  Employees)  accept  individual  rollovers  in  cash of
Transferred  Employees'  distributions from the Seller Savings Plans, subject to
the terms and  conditions  of the Buyer DC Plans  and  applicable  law.  Buyer's
obligations  under this subsection  9.04(b) are contingent upon receipt by Buyer
of a favorable determination letter or Seller' certificate to Buyer, in a manner
reasonably  acceptable  to Buyer,  that the Seller  Savings  Plans are qualified
under the applicable provisions of the Code.



                                   ARTICLE 10

                              CONDITIONS TO CLOSING

         SECTION 10.1.  Conditions to Obligations of Buyer and Seller.  The
obligations of Buyer and Seller to consummate the Closing are subject to the
satisfaction of the following conditions:

                  (a) Any  applicable  waiting period under the HSR Act relating
         to the  transactions  contemplated  hereby  shall have  expired or been
         terminated.

                  (b) No provision of any  applicable  law or regulation  and no
         judgment,  injunction,  order or decree of any  Governmental  Authority
         having competent  jurisdiction,  shall prohibit the consummation of the
         Closing.

                  (c) All  actions  by or in  respect  of or  filings  with  any
         Governmental  Authority  required  to permit  the  consummation  of the
         Closing shall have been taken, made or obtained.

                  (d) Seller and Buyer shall have entered into a master sublease
         pursuant  to  the  terms  of  Section  2.14  and  otherwise  reasonably
         satisfactory to each of Seller and Buyer



<PAGE>


         SECTION 10.2.  Conditions to Obligation of Buyer.  The obligation of
Buyer to consummate the Closing is subject to the satisfaction of the following
further conditions:

                  (a) (i) Seller shall have  performed in all material  respects
         all of its obligations  hereunder  required to be performed by it on or
         prior to the Closing Date, (ii) the  representations  and warranties of
         Seller contained in this Agreement, of Oaktree contained in the Oaktree
         Guarantee or of Seller or Oaktree in any  certificate  or other writing
         delivered  by  Seller  or  Oaktree  pursuant  hereto  or in  connection
         herewith,  disregarding  all  qualifications  and exceptions  contained
         therein  relating to materiality  or Seller  Material  Adverse  Effect,
         shall be true at and as of the  Closing  Date,  as if made at and as of
         such  date  with only  such  exceptions  as could not in the  aggregate
         reasonably  be expected to have a Seller  Material  Adverse  Effect and
         (iii)  Buyer  shall  have  received a  certificate  signed by the Chief
         Executive  Officer  of Seller  and a senior  officer  of Oaktree to the
         foregoing effect.

                  (b) There shall not be  threatened  (to the knowledge of Buyer
         or  Seller),  instituted  or pending  any action or  proceeding  by any
         Person  before any  Governmental  Authority  (i)  seeking to  restrain,
         prohibit or  otherwise  interfere  with the  ownership  or operation by
         Buyer or any of its  Affiliates  of all or any material  portion of the
         Purchased  Assets  or the  business  or  assets  of Buyer or any of its
         Affiliates  or to compel Buyer or any of its  Affiliates  to dispose of
         all or any material  portion of the Purchased Assets or assets of Buyer
         or any of its  Affiliates  or (ii)  seeking to require  divestiture  by
         Buyer or any of its Affiliates of any Purchased Assets.

                  (c) There shall not be any action taken, or any statute, rule,
         regulation,   injunction,   order   or   decree,   enacted,   enforced,
         promulgated,  issued  or  deemed  applicable  to  the  purchase  of the
         Purchased  Assets,  by  any  Governmental  Authority,  other  than  the
         application  of the  waiting  period  provisions  of the HSR Act to the
         purchase of the Purchased Assets,  that could,  directly or indirectly,
         result in any of the  consequences  referred to in clauses  10.02(b)(i)
         and 10.02(b)(ii) above.



<PAGE>


                  (d) Buyer shall have  received an opinion of Latham & Watkins,
         counsel to Seller, an opinion of Milbank,  Tweed,  Hadley & McCloy LLP,
         counsel to Oaktree,  an opinion of Kenneth  Liang,  general  counsel to
         Oaktree and an opinion of Morris, Nichols, Arsht and Tunnell, each such
         opinion  dated the  Closing  Date and to be  reasonably  acceptable  to
         Buyer.   In  rendering  such  opinion,   such  counsel  may  rely  upon
         certificates of public officers,  as to matters governed by the laws of
         jurisdictions  other  than New York or the  federal  laws of the United
         States of America, upon opinions of counsel reasonably  satisfactory to
         Buyer,  and, as to matters of fact,  upon  certificates  of officers of
         Seller,   copies  of  which   opinions   and   certificates   shall  be
         contemporaneously delivered to Buyer.
                  (e) Seller  shall have  executed  and  delivered  to Buyer the
         Assignment  and  Assumption  Agreement  and such other deeds,  bills of
         sale,   endorsements,   assignments   and  other  good  and  sufficient
         instruments  of  conveyance  and  assignment  as the  parties and their
         respective  counsel shall deem  reasonably  necessary or appropriate to
         vest in Buyer  all  right,  title  and  interest  in,  to and under the
         Purchased Assets; Seller shall have executed and delivered to Buyer the
         Registration   Rights  Agreement;   Oaktree  shall  have  executed  and
         delivered  to  Buyer  the  Oaktree  Guarantee  and any  other  document
         required to consummate the transactions contemplated hereby.

                  (f) Seller shall have  received all Material  Consents,  other
         than any consent  required  under  Contracts  with  Customers,  and all
         consents, authorizations or approvals from the Governmental Authorities
         referred to in Section 3.03 or 3.21, in each case in form and substance
         reasonably satisfactory to Buyer, and no such consent, authorization or
         approval shall have been revoked.

                  (g) Buyer shall have received all documents it may  reasonably
         request relating to the existence and good standing in its jurisdiction
         of incorporation of Seller, Subsidiary and Oaktree and the authority of
         Seller and Oaktree to execute,  deliver and perform this Agreement, the
         Oaktree  Guarantee and the other documents,  agreements and instruments
         referred  to herein or therein  to which  Seller or Oaktree is a party,
         all in form and substance reasonably satisfactory to Buyer.

                  (h)   Seller   shall   have   made   arrangements   reasonably
         satisfactory to Buyer (including monthly rental payments by Buyer of no
         greater than $36,180.56) for Buyer's possession and use of the facility
         at 3301 C Street,  Sacramento,  CA 95817 from the Closing  Date through
         October 31, 1999.

                  (i)  Seller  shall have  received a payoff  letter in form and
         substance  satisfactory  to Buyer,  including an undertaking to release
         all  Liens on any asset of Seller  or  Subsidiary  created  under or in
         connection  with the Daiwa Loan  Agreements or related  documents  upon
         full  payment of the amount  listed in the payoff  letter,  executed by
         each  holder  of such  Lien  along  with  an  undertaking  to file  all
         documents  necessary  to  evidence  and record the release of all Liens
         created under the Daiwa Loan Agreements and related documents  ("Payoff
         Letter").

                  (j) Subsidiary shall have merged with and into Seller pursuant
to documentation reasonably satisfactory to Buyer.



<PAGE>


         SECTION 10.3.  Conditions to Obligation of Seller.  The obligation of
Seller to consummate the Closing is subject to the satisfaction of the
following further conditions:

                  (a) (i) Buyer shall have  performed in all  material  respects
         all of its obligations  hereunder  required to be performed by it on or
         prior to the Closing Date, (ii) the  representations  and warranties of
         Buyer  contained  in this  Agreement  and in any  certificate  or other
         writing   delivered  by  Buyer  pursuant   hereto,   disregarding   all
         qualifications and exceptions contained therein relating to materiality
         or  Buyer  Material  Adverse  Effect,  shall  be  true at and as of the
         Closing  Date,  as if  made  at and as of  such  date  with  only  such
         exceptions as could not in the aggregate reasonably be expected to have
         a Buyer Material  Adverse Effect and (iii) Seller shall have received a
         certificate signed by the Chief Executive Officer or any Executive Vice
         President of Buyer to the foregoing effect.

                  (b) There shall not be  threatened  (to the knowledge of Buyer
         or  Seller),  instituted  or pending  any action or  proceeding  by any
         Person before any Governmental Authority seeking to restrain,  prohibit
         or otherwise  interfere with the transfer of the Purchased  Assets or a
         material portion thereof by Seller to Buyer.

                  (c) There shall not be any action taken, or any statute, rule,
         regulation, injunction, order or decree enacted, enforced, promulgated,
         issued or deemed applicable to the transfer of the Purchased Assets, by
         any Governmental  Authority,  other than the application of the waiting
         period  provisions  of the HSR  Act to the  transfer  of the  Purchased
         Assets  that  could,  directly  or  indirectly,  result  in  any of the
         consequences referred to in Section 10.03(b) above.

                  (d)  Seller  shall  have  received  an opinion of Davis Polk &
         Wardwell,  counsel to Buyer,  dated the Closing Date, and an opinion of
         Mark L. Bibi,  Executive Vice President,  Secretary and General Counsel
         of the Buyer, dated the Closing Date, each as reasonably  acceptable to
         Seller.  In  rendering  such  opinion,   such  counsel  may  rely  upon
         certificates of public officers,  as to matters governed by the laws of
         jurisdictions  other  than New York or the  federal  laws of the United
         States of America, upon opinions of counsel reasonably  satisfactory to
         Seller,  and, as to matters of fact,  upon  certificates of officers of
         Buyer,   copies   of  which   opinions   and   certificates   shall  be
         contemporaneously delivered to Seller.

                  (e) Buyer  shall have  executed  and  delivered  to Seller the
         Consideration Note, a certificate  evidencing the Consideration Shares,
         the Registration  Rights Agreement and any other documents  required to
         consummate the transactions contemplated hereby.



<PAGE>


                  (f) Buyer shall have received all required consents under each
         agreement,  contract,  instrument or Permit listed on Schedule 4.05 and
         all other  consents,  authorizations  or  approvals  from  Governmental
         Authorities  referred  to in  Section  4.03,  in each  case in form and
         substance  reasonably  satisfactory  to  Seller,  and no such  consent,
         authorization or approval shall have been revoked.

                  (g) Seller shall have received all documents it may reasonably
         request  relating  to the  existence  and good  standing in Delaware of
         Buyer and the  authority of Buyer to execute,  deliver and perform this
         Agreement and the other documents,  agreements and instruments referred
         to  herein  to  which  Buyer  is a  party,  all in form  and  substance
         reasonably satisfactory to Seller.



                                   ARTICLE 11

                            SURVIVAL; INDEMNIFICATION

         SECTION  11.1.  Survival.  The  representations  and  warranties of the
parties  hereto  contained  in this  Agreement  or in any  certificate  or other
writing  delivered  pursuant hereto or in connection  herewith shall survive the
Closing  until the second  anniversary  of the Closing  Date;  provided that the
representations  and warranties  contained in Article 8 or 9 shall survive until
the expiration of the statute of limitations  applicable to the matters  covered
thereby  (giving  effect to any waiver,  mitigation  or extension  thereof),  if
later. Notwithstanding the preceding sentence, any representation or warranty in
respect of which  indemnity may be sought under this Agreement shall survive the
time at which it would otherwise  terminate pursuant to the preceding  sentence,
if the party  seeking  indemnification  under  Section  11.02 (the  "Indemnified
Party")  delivers  written notice of the inaccuracy  thereof giving rise to such
right  of  indemnity  to  the  party  against  whom  indemnity  is  sought  (the
"Indemnifying Party") within the applicable survival period.

         SECTION  11.2.  Indemnification.  (a) Seller hereby  indemnifies  Buyer
against  and  agrees  to hold  Buyer  harmless  from any and all  damage,  loss,
liability and expense  (including,  without  limitation,  reasonable expenses of
investigation and reasonable attorneys' fees and expenses in connection with any
action,  suit or proceeding)  ("Damages")  incurred or suffered by Buyer arising
out of:

                  (i) any  misrepresentation or breach of warranty,  covenant or
         agreement made or to be performed by Seller pursuant to this Agreement;
         or

                 (ii) any Excluded Liability.



<PAGE>


          (b) Buyer hereby  indemnifies Seller against and agrees to hold Seller
harmless from any and all Damages incurred or suffered by Seller arising out of:

                  (i) any  misrepresentation or breach of warranty,  covenant or
         agreement made or to be performed by Buyer pursuant to this  Agreement;
         or

                 (ii) any Assumed Liability.

         SECTION 11.3.  Procedures.  (a) The Indemnified Party shall give prompt
notice  to  the  Indemnifying  Party  of the  assertion  of  any  claim,  or the
commencement of any suit, action or proceeding in respect of which indemnity may
be sought under Section 11.02.  The  Indemnifying  Party shall have the right at
any time to assume and thereafter  conduct the defense of any such claim,  suit,
action  or  proceeding   ("Claim")   with  counsel  of  its  choice   reasonably
satisfactory  to the Indemnified  Party.  Upon such assumption of the defense of
any Claim hereunder,  the Indemnified Party and its Affiliates shall (i) provide
the  Indemnifying  Party and its counsel with reasonable  access to its officers
and  employees,  the  Purchased  Assets,  the  Excluded  Assets and any books or
records  pertaining  thereto as the Indemnifying Party or its counsel shall deem
necessary in investigating  the defense of such claim, and (ii) the Indemnifying
Party will not consent to the entry of any judgment or enter into any settlement
with respect to the Claim without the prior written  consent of the  Indemnified
Party (which consent shall not be withheld or denied  unreasonably).  Unless and
until an Indemnifying  Party assumes the defense of the Claim as provided in the
foregoing sentence,  however, the Indemnified Party may defend against the Claim
in any manner it reasonably may deem appropriate; provided that in no event will
the  Indemnified  Party  consent to the entry of any  judgment or enter into any
settlement  with respect to such Claim without the prior written  consent of the
Indemnifying Party (which consent shall not be withheld or denied  unreasonably)
and; provided further that in no event shall the Indemnifying  Party be required
to pay the fees or  disbursements  of more  than one firm of  attorneys  for the
Indemnified Parties with respect to any such Claim.

          (b) Buyer  shall be  entitled  to set-off  and  recoup any  principal,
interest  or other  amounts  payable  by it under the Notes  (regardless  of the
identity  of the  holder or  holders  of the Notes and  whether  or not any such
amount is then due and payable) by the amount of damages to Buyer under  Section
5.08  which  shall not be less than  $2,000,000  or greater  than the  principal
amount of the Notes. If Buyer (i) sets-off or recoups against the Notes pursuant
to  this   Section   11.03(b),   Buyer  shall  not  be  entitled  to  claim  any
indemnification  under  Section  11.02(i)  with respect to the breach of Section
5.08 hereof or (ii) makes any claim for  indemnification  under Section 11.02(i)
with  respect to the breach of Section  5.08,  Buyer  shall not be  entitled  to
set-off  against  the Notes  pursuant  to this  Section  11.03(b).  Buyer  shall
promptly  notify  Seller of any  offset or  recoupment  taken  pursuant  to this
Section 11.03(b).



<PAGE>


         SECTION 11.4.  Limitations.

          (a)  Seller  shall  not  be  liable  for  any  Damages  under  Section
11.02(a)(i)  until the  aggregate  amount of Damages with respect to all matters
referred  to in  Section  11.02(a)(i)  exceeds  $1,000,000  and then only to the
extent of such excess.  Seller's maximum  aggregate  liability for Damages under
Section  11.02(a)(i)  shall not exceed (i) $15,000,000 for Damages for claims as
to which notice has been  provided to Seller prior to the first  anniversary  of
the Closing  Date plus (ii) the lesser of (A)  $10,000,000  or (B) the amount by
which  $15,000,000  exceeds the Damages paid pursuant to clause (i) above, as to
which notice has been  provided to Seller  between the date  commencing  one day
after the first anniversary date of Closing and ending on the second anniversary
date of Closing.

          (b)  Buyer  shall  not  be  liable  for  any  damages   under  Section
11.02(b)(i)  until the  aggregate  amount of Damages with respect to all matters
referred  to in  Section  11.02(b)(i)  exceeds  $1,000,000  and then only to the
extent of such excess.  Buyer's  maximum  aggregate  liability for Damages under
Section  11.02(b)(i)  shall not exceed (i) $15,000,000 for Damages for claims as
to which notice has been provided to Buyer prior to the first anniversary of the
Closing Date plus (ii) the lesser of (A)  $10,000,000 or (B) the amount by which
$15,000,000  exceeds the Damages paid pursuant to clause (i) above,  as to which
notice has been provided to Buyer between the date  commencing one day after the
first  anniversary date of Closing and ending on the second  anniversary date of
Closing.



                                   ARTICLE 12

                                   TERMINATION

         SECTION 12.1.  Grounds for Termination.  This Agreement may be
terminated at any time prior to the Closing:

                  (a)    by mutual written agreement of Seller and Buyer;

                  (b) by  Seller  or Buyer if the  Closing  shall  not have been
         consummated  on or before  the date that is eighty  days after the date
         hereof;

                  (c) by Seller or Buyer if there shall be any law or regulation
         that makes consummation of the transactions contemplated hereby illegal
         or  otherwise   prohibited  or  if  consummation  of  the  transactions
         contemplated hereby would violate any nonappealable final order, decree
         or judgment of any Governmental Authority having competent jurisdiction
         which cannot be cured within 10 Business Days.


<PAGE>



         The party  desiring to  terminate  this  Agreement  pursuant to clauses
12.01(b) or 12.01(c) shall give notice of such termination to the other party.

         SECTION 12.2. Effect of Termination. If this Agreement is terminated as
permitted  by Section  12.01,  such  termination  shall be without  liability of
either party (or any stockholder or  Representative  of such party) to any other
party to this Agreement; provided that if such termination shall result from the
(i) willful failure of either party to fulfill a condition to the performance of
the  obligations of the other party,  (ii) failure to perform a covenant of this
Agreement  or (iii)  breach by either  party  hereto  of any  representation  or
warranty or agreement contained herein, such party shall be fully liable for any
and all  Damages  incurred  or  suffered  by the other party as a result of such
failure or breach.  The provisions of Sections  5.02(d),  6.02,  7.04(b),  7.05,
13.03,  13.05,  13.06 and 13.07 shall survive any termination hereof pursuant to
Section 12.01.



                                   ARTICLE 13

                                  MISCELLANEOUS

         SECTION 13.1.  Notices. All notices, requests and other communications
to any party hereunder shall be in writing (including facsimile transmission)
and shall be given,

           if to Buyer, to:

           Unilab Corporation
           401 Hackensack Avenue
           Hackensack, New Jersey 07601
           Attention: Mark L. Bibi
           Fax: (201) 525-1331

           and

           Unilab Corporation
           18448 Oxnard Street
           Tarzana, CA 91356
           Attention: Brian Urban
           Fax: (818) 757-3809



<PAGE>


           with a copy to:

           Davis Polk & Wardwell
           450 Lexington Avenue
           New York, New York  10017
           Attention: Donald S. Bernstein
           Fax: (212) 450-4800

           if to Seller or the Subsidiary, to:

           Bio-Cypher Laboratories
           c/o J. Marvin Feigenbaum
           Westwood Marquis
           930 Hillgard Avenue
           Los Angeles, CA 90024
           Fax: (310) 824-0355

           with a copy to:

           Latham & Watkins
           505 Montgomery St. Suite 1900
           San Francisco, CA 94111
           Attention: Paul DeMuro
           Fax: (415) 395-8095

           and to:

           Oaktree Capital Management, LLC
           333 South Grand Avenue, 28th Floor
           Los Angeles, CA 90071
           Attention: Kenneth Liang
           Fax: (213) 830-8522

           with a copy to:

           Milbank, Tweed, Hadley & McCloy LLP
           601 South Figueroa Street
           Los Angeles, CA 90017
           Attention: Robert Jay Moore
           Fax: (213) 629-5063



<PAGE>


All such notices,  requests and other communications shall be deemed received on
the date of receipt by the recipient  thereof if received prior to 5 p.m. in the
place of  receipt  and  such  day is a  Business  Day in the  place of  receipt.
Otherwise, any such notice, request or communication shall be deemed not to have
been received until the next succeeding business day in the place of receipt.

         SECTION  13.2.  Amendments  and  Waivers.  (a)  Any  provision  of this
Agreement may be amended or waived if, but only if, such  amendment or waiver is
in writing  and is signed,  in the case of an  amendment,  by each party to this
Agreement,  or in the case of a waiver,  by the party against whom the waiver is
to be effective.

          (b) No failure or delay by any party in exercising any right, power or
privilege  hereunder  shall operate as a waiver  thereof nor shall any single or
partial  exercise  thereof preclude any other or further exercise thereof or the
exercise of any other right, power or privilege.  The rights and remedies herein
provided  shall be  cumulative  and not  exclusive  of any  rights  or  remedies
provided by law.

         SECTION 13.3.  Expenses.  Except as otherwise provided herein, all
costs and expenses incurred in connection with this Agreement shall be paid by
the party incurring such cost or expense.

         SECTION 13.4.  Successors and Assigns. The provisions of this Agreement
shall be binding  upon and inure to the benefit of the parties  hereto and their
respective successors and assigns;  provided that no party may assign,  delegate
or otherwise  transfer any of its rights or  obligations  under this  Agreement,
without  the  consent  of each other  party  hereto,  except  that (i) Buyer may
transfer or assign, in whole or from time to time in part, to one or more of its
Affiliates,  the right to purchase all or a portion of the Purchased Assets, but
no such transfer or assignment will relieve Buyer of its  obligations  hereunder
or impose any  additional  obligation  on Seller and (ii) Seller may transfer or
assign, in whole or from time to time in part, to one or more of its Affiliates,
any of its rights under this Agreement,  but no such transfer or assignment will
relieve Seller of its obligations  hereunder or impose any additional obligation
on Buyer.

         SECTION 13.5.  Governing Law.  Agreement shall be governed by and
construed in accordance with the law of the State of New York, without regard
to the conflicts of law rules of such state.



<PAGE>


         SECTION 13.6.  Jurisdiction.  Except as otherwise expressly provided in
this  Agreement,  the parties  hereto agree that any suit,  action or proceeding
seeking to enforce any provision of, or based on any matter arising out of or in
connection with, this Agreement or the transactions  contemplated  hereby may be
brought in the United  States  District  Court for the Southern  District of New
York or any other New York court sitting in  Manhattan,  and each of the parties
hereby  consents to the  jurisdiction  of such  courts  (and of the  appropriate
appellate  courts  therefrom)  in  any  such  suit,  action  or  proceeding  and
irrevocably  waives, to the fullest extent permitted by law, any objection which
it may now or hereafter have to the laying of the venue of any such suit, action
or  proceeding  in any such  court or that any such suit,  action or  proceeding
which is brought in any such court has been  brought in an  inconvenient  forum.
Process  in any such  suit,  action  or  proceeding  may be  served on any party
anywhere in the world,  whether within or without the  jurisdiction  of any such
court. Without limiting the foregoing, each party agrees that service of process
on such party as provided in Section 13.01 shall be deemed effective  service of
process on such party.

         SECTION 13.7.  WAIVER OF JURY TRIAL.  EACH OF THE PARTIES HERETO HEREBY
IRREVOCABLY  WAIVES  ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL  PROCEEDING
ARISING OUT OF OR RELATED TO THIS  AGREEMENT  OR THE  TRANSACTIONS  CONTEMPLATED
HEREBY.

         SECTION 13.8. Counterparts;  Third Party Beneficiaries.  This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures  thereto and hereto were upon the same
instrument.  This Agreement shall become  effective when each party hereto shall
have  received  a  counterpart  hereof  signed by the  other  party  hereto.  No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

         SECTION  13.9.  Entire  Agreement.  This  Agreement,  together with all
exhibits and  schedules  hereto,  and the Buyer  Non-Disclosure  Agreement,  the
Seller  Non-Disclosure  Agreement  constitute the entire  agreement  between the
parties with respect to the subject  matter of this  Agreement and supersede all
prior agreements and understandings,  both oral and written, between the parties
with respect to the subject matter of this  Agreement.  The parties hereto agree
that upon the effectiveness of this Agreement,  the Exclusivity  Agreement dated
as of January  17,  1999 among  Buyer,  Seller,  Oaktree  and  Nu-Tech is hereby
terminated.

         SECTION 13.10.  Bulk Sales Laws.  Buyer and Seller each hereby waive
compliance by Seller with the provisions of the "bulk sales", "bulk transfer"
or similar laws of any state.

         SECTION 13.11.  Captions.  The captions herein are included for
convenience of reference only and shall be ignored in the construction or
interpretation hereof.



<PAGE>


         SECTION  13.12.  Schedules  and  Exhibits.  The  Schedules and Exhibits
attached to this  Agreement  are  incorporated  herein and shall be part of this
Agreement for all purposes;  provided however,  that Seller and Buyer each shall
have the right to update and/or  supplement  any or all of the Schedules  (other
than  Schedules  1.01 and 2.08) by  providing  the other party with such updated
and/or supplemented schedules no later than one Business Day after the date when
any  applicable  waiting  period under the HSR Act relating to the  transactions
contemplated  hereby shall have expired or been terminated.  The recipient party
shall  have the  right to  review  the  revised  Schedules  for a period  of two
Business  Days after receipt  thereof.  At any time within the two Business Days
time  period  Buyer  shall have the right to request an  adjustment  to the Cash
Amount or to  terminate  this  Agreement  by  notice  to  Seller if the  revised
information  would reasonably be likely to have a material adverse effect on the
business of Buyer. This notice, if given, shall specify the information  forming
the basis for the  decision  to request an  adjustment  to the Cash Amount or to
terminate.  Seller shall have two Business  Days after  receipt of the notice to
review with Buyer the  information  forming the basis for the  decisions  and to
attempt to agree on corrective  measure,  if any. If the parties cannot agree on
corrective  measures within such two Business Day period,  then parties will use
their  respective  best  efforts  to agree on a  methodology  to  determine  the
adjustment,  if any, to the Cash Amount or if no  methodology  is agreed to then
the parties  will enter into  binding  alternative  dispute  resolution.  If the
Agreement is not terminated as permitted by this Section,  Buyer shall be deemed
to have accepted such revisions, and the Schedules attached to this Agreement as
of the date hereof shall be deemed to be  superseded  by the revised  Schedules,
but Buyer  shall have a claim  against  Seller for any  diminished  value of the
Purchased Assets.



<PAGE>




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

                                       UNILAB CORPORATION


                                      By: 
                                      Name: Richard A. Michaelson
                                      Title: Director


                                      PHYSICIANS CLINICAL LABORATORY, INC.
                                      D/B/A BIO-CYPHER LABORATORIES


                                      By: 
                                      Name: J. Marvin Feigenbaum
                                      Title: Chief Executive Officer





<PAGE>




                                  Schedule 1.01

OCM Opportunities Fund, L.P.

OCM Opportunities Fund II, L.P.

Oaktree Capital Management,  LLC as investment manger of the Columbia/HCA Master
Retirement Trust (Separate Account I)

Oaktree Capital Management,  LLC as investment manger of the Columbia/HCA Master
Retirement Trust (Separate Account II)


<PAGE>



                           CROSS-REFERENCE TARGET LIST

          NOTE: Due to the number of targets some target names may not appear
in the target pull-down list.
   
(This list is for the use of the wordprocessor only, is not a part of this
document and may be discarded.)



ARTICLE/SECTION       TARGET NAME


1.........................def.art
1.01..........................def
1.01(a)..................term.def
1.01(b).................term.list


2..................purch.sale.art
2.01................pur.and.sales
2.01(a).............real.property
2.01(b).............real.prop.int
2.01(c)...................raw.mat
2.01(d).........all.rts.contracts
2.01(e)..................all.acct
2.01(f)...........all.prepaid.exp
2.01(g)................petty.cash
2.01(h)............rt.3rd.parties
2.01(i)............patents.cpyrts
2.01(j).........trans.lic.permits
2.01(k)............all.bk.records
2.01(m).....................2.01m
2.01(n)..............all.goodwill
2.02....................ex.assets
2.02(a)..................ex.ass.a
?........................ex.ass.b
2.02(b), 2.02(d).........ex.ass.c
2.02(c)..................ex.ass.d
2.02(e)..................ex.ass.e
2.02(f), 2.02(g).........ex.ass.f
2.03.....................ass.liab
2.03(a)...........all.liabilities
2.03(b)...........liab.oblig.comm
2.03(c)..................the.liab
?.............liab.oblig.ins.proc
2.03(d)........liab.oblig.permits
2.03(e).the.liabilities.of.seller
2.03(g)liabilities.under.worker.adjt
2.04..................exclud.liab
2.04(a)...........liability.taxes
2.04(b).............emp.bene.liab
2.04(c)..........any.environ.liab
2.04(d).............liab.ex.asset
2.04(i)..............liab.exp.ass
2.05.............assign.contracts
2.06............pur.prc.all.purch
2.06(a)...............purch.price
2.06(b)..........purch.price.allo
2.06(c).........sell.buy.bnd.allo
2.06(d)............copy.form.8592
2.07......................closing
2.08..........adjt.purchase.price
2.09........remittance.obligation
?.........terms.assign.assump.agt
?..............................07
?............................2.08
2.10.............pros.reimbs.deps
2.10(a).......sell.buy.bond.alloc
2.10(a)(i)............applic.chgs
2.10(a)(ii).....liens.not.detract
2.10(b).........sell.by.bnd.alloc
2.11..............patient.refunds
2.11(a)...................2.11(a)
2.11(c).............refund.adjust
2.11(d).......refund.payment.date
2.12..............second.cash.pay
2.13...............adjmt.disputes

3....................rep.war.sell
3.01..................corp.exist.
3.02..............sell.corp.autho
3.03..................gov't.auth.
3.04..............noncontravent.
3.05.................req.consent
3.05............required.consent
3.06.............financial stmts
3.07...............abs.cert.chgs
3.07(a)............any.event.adv
3.07(c).........any.lien.mat.adv
3.07(d)...............any.damage
3.07(e)..........any.transaction
3.07(f).............any.chg.acct
3.07(g)..............any.emp.agt
3.07(h)........any.labor.dispute
3.07(i)...........any.cap.expend
3.08..............no.undisclosed
3.08(a).......................02
3.08(b).......................01
3.09...............mat.contracts
3.09(a).........except.contracts
3.09(b)........each.contract.dis
3.09(c)..................3.09(c)
3.10....................sell.lit
3.11........................3.11
3.12..................properties
3.12(a)...........sell.real.prop
3.12(b)...........sell.pers.prop
3.12(c)...........sell.has.title
3.12(d).......all.real.prop.used
3.12(e).......all.leases.good.st
3.12(f)..........bldg.no.mat.def
3.12(g)..................3.12(g)
3.13.................sufficiency
3.13(a)...........purch.all.prop
3.13(b)............buy.acq.title
3.14..................intel.prop
3.14(a)......list.intel.prop.rts
3.14(b)......sell.not.def.intell
3.15.....................ins.cov
3.16.............license.permits
3.17.................receivables
3.18.............selling.documnt
3.19................finders.fees
3.20..............sell.employees
3.21..............environ.compl.
3.21(a)..........except.as.discl
3.21(b)........no.environ.invest
3.21(c)................not.nj.ct
3.21(d)..............seller.term
?............arrange.shareholder
3.22(d)............understanding
3.23..................subsidiary
3.23(b)(i)...........no.out.secs
3.23(b)(ii)..........no.out.opts
?.................sell.represent


4....................rep.war.buy
4.01..............org.and.exist.
4.02..............buy.corp.autho
4.03...............buy.gov.autho
4.04..........sec.noncontravent.
4.05....................consents
4.06...................buy.finan
4.07..............buy.litigation
4.08............buy.finders.fees
4.09.........................001
4.10.....................sec.doc
4.12........................4.12
4.13........................4.13
4.14........................4.14

5...................cov.sell.art
5.01................sell.cond.busi
5.01(a)...............buy.not.acqu
5.01(b)............buy.sell.assets
5.01(c)..............buy.not.agree
5.01(d).............buy.not.commit
5.02....................acc.inform
5.02(a)...........full.access.info
5.02(b)............hold.confid.doc
5.02(c), 5.02(d)...access.to.books
5.03...................cep.filings
5.04.............not.of.cer.events
5.04(a).............person.conesnt
5.04(b)...........gov.regul.agency
5.04(c).........actions.threatened
5.04(d).............damage.by.fire
5.05...............no.shopping.dis
5.07.................customer.list
5.08.................aud.fin.stmts

6......................cov.buy.art
6.01.................reps.warrants
6.02................confientiality
6.03........................access

7.....................cov.buy.sell
7.01............best.efforts.furth
7.01(a)................cause.to.do
7.01(d).......seller.becomes.aware
7.01(c), 7.01(d).buy.true.law.atty
7.02..................cert.filings
7.03...............public.announce
7.04..................no.solic.emp
7.04(b)........no.solic.emp.during
7.05............no.solic.customers
7.06.................provider.nums

8..........................tax.def
8.01...................tax.mat.def
8.02.......................tax.mat
8.02(a)..........seller.paid.taxes
8.02(b), 8.02(c).seller.estab.acct
?..............tax.mat.subsidieary
8.03.........tax.coop;alloc.of.tax
8.03(a)..........furn.info.nec.tax
8.03(b).............all.real.propr
8.03(c).............transfer.taxes

9.....................emp.bene.art
9.01................employ.ben.def
9.02(a)...............emp.ben.plan
9.02....................erisa.reps
 .........................emp.plans
9.02(b)...........no.multiemp.plan
?...............emp.plan.qualified
9.02(c).............list.emp.sever
?.................exc.as.set.forth
9.02(d)........no.fail.time.instal
9.02(e)..........no.trans.employee
9.02(e)...........no.trans.emp.ent
9.03....................employ.ben
9.03(a)............active.employee
9.03(b)...........sell.sec.emp.agt
9.04.............sell.emp.bene.pln
9.04(a)..........sell.retain.oblig

10...................cond.to.clos.
10.01...................cond.oblig
10.01(a).........cond.hsr.wait.exp
10.01(b)...........no.law.prohibit
10.01(c), 10.01(d)all.action.taken
10.02...............cond.oblig.buy
10.02(a)..........sell.perf.oblig
10.02(b)...........no.pending.act
10.02(c)..........no.gov.act.take
10.02(d)...........opin.coun.sell
10.02(e)........exe.del.other.agt
10.02(f)........rec.all.recq.cons
10.03.............cond.oblig.sell
10.03(a).......buy.perf.all.oblig
10.03(b).....buy.perf.all.oblig.b
10.03(c).....buy.perf.all.oblig.c
10.03(e)...........exec.del.other
10.03(f)........buy.rec.all.conse
10.03(g)........sell.rec.all.docs


11.................surv.indem.art
11.01....................survival
11.02.............indemnification
11.02(a).......................04
11.02(a)(i)...........brch.warrty
11.02(b)(i)................misrep
11.03..................procedures
11.03(b).......................05
11.04.................limitations
11.04(a)............sell.not.liab
11.04(b).............buy.not.liab

12.......................term.art
12.01................grounds.term
12.01(a)...............mutual.agt
12.01(b)..........clos.not.consum
?...................trans.illegal
12.02.................effect.term


13.......................misc.art
13.01.....................notices
13.02.................amend.waive
13.02(a)...........any.prov.amend
13.02(b)...........no.delay.waive
13.03....................expenses
13.04................succ.assigns
13.05...............governing.law
13.06................jurisdiction
13.07...........waiver.jury.trial
13.08................counterparts
13.09..................entire.agt
13.10.............bulk.sales.laws
13.11....................captions





<PAGE>







NEITHER THIS NOTE, THE SECONDARY NOTES ISSUABLE IN RESPECT OF INTEREST HEREUNDER
NOR THE SHARES OF THE ISSUER'S COMMON STOCK ISSUABLE UPON CONVERSION HEREOF HAVE
BEEN  REGISTERED  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE  "SECURITIES
ACT"),  OR ANY STATE  SECURITIES  LAWS.  THIS NOTE HAS BEEN (AND ANY SUCH  OTHER
NOTES AND SHARES WILL BE)  ACQUIRED FOR THE ACCOUNT OF THE HOLDER AND NOT WITH A
VIEW TOWARDS,  OR FOR RESALE IN CONNECTION WITH A PUBLIC OFFERING AND MAY NOT BE
OFFERED FOR SALE,  SOLD,  TRANSFERRED OR ASSIGNED IN THE ABSENCE OF AN EFFECTIVE
REGISTRATION  STATEMENT UNDER THE SECURITIES ACT OR APPLICABLE  STATE SECURITIES
LAW, OR AN EXEMPTION FROM SUCH  REGISTRATION OR UNLESS SOLD PURSUANT TO RULE 144
UNDER THE SECURITIES ACT.


No. ___                                               $[                  ]

                               UNILAB CORPORATION

                                   7.50% NOTE

         UNILAB  CORPORATION,   a  Delaware   corporation   (together  with  its
successors,  the  "Issuer"),  for  value  received,  hereby  promises  to pay to
PHYSICIANS CLINICAL LABORATORIES, INC., a Delaware corporation doing business as
Bio-Cypher  Laboratories  (the "Holder"),  and its  successors,  transferees and
permitted  assigns the principal  sum of TWENTY FIVE MILLION  DOLLARS AND 00/100
CENTS  ($25,000,000)  in accordance with the terms and conditions  hereof,  plus
interest from and after the date hereof as provided herein.

         The unpaid  principal amount of this Note outstanding from time to time
shall bear interest at the rate of 7.50% per annum,  subject to any  limitations
on the rate of interest  imposed by  applicable  law,  which  interest  shall be
computed on the basis of the actual  number of days  elapsed  over a year of 365
days, and shall be payable semiannually in arrears on each [ ] and [ ] after the
date hereof  until such  principal  amount is paid in full as  provided  herein.
Subject to Section 6, the Issuer may pay interest on this Note either in cash or
through  the  issuance  of  additional  Notes,  at the  Issuer's  option,  which
additional Notes (the "Secondary Notes") shall be dated the applicable  interest
payment date,  shall have the same terms and restrictions as this Note and shall
be in an aggregate principal amount equal to the amount of interest payable with
respect to this Note if such  interest  were paid in cash.  The  issuance of any
such Secondary Note to the Holder hereof will be considered  payment of interest
on this Note on the applicable  interest payment date. Each Secondary Note shall
bear a legend in a form  substantially  the same as the legend which  appears on
the face hereof.



<PAGE>



         Any cash payments made to the Holder  hereunder shall be made in United
States  Dollars by wire transfer of  immediately  available  funds to an account
designated  by the  Holder by notice to the  Issuer  (or,  if no such  notice is
received by the Issuer,  by check delivered to such Holder's address as the same
appears on the Register  (defined below)) in such coin or currency of the United
States  of  America  as at the time of  payment  shall be legal  tender  for the
payment of public and private debts.

         This Note is a duly  authorized  Note of the Issuer  referred to in the
Asset Purchase  Agreement  (the "Asset  Purchase  Agreement")  dated as of April
[___],  1999  between  the Issuer and  Physicians  Clinical  Laboratories,  Inc.
("Seller").

         This Note may be  transferred or assigned in whole and in part, but any
partial assignment must be in a minimum aggregate amount of $1,000,000; provided
that the initial  holder of the Note issued on the Closing  Date under the Asset
Purchase  Agreement  may  assign  partial  interests  in its  Note of less  than
$1,000,000  to no more than three  persons.  The  Issuer  agrees to issue to the
Holder or any permitted transferee of the Holder from time to time a replacement
Note or Notes in the form hereof,  provided  that the transfer or  assignment is
made in compliance with applicable securities laws, and evidence of the transfer
or assignment reasonably  satisfactory to the Issuer, together with the original
Note,  are delivered to the Issuer.  References to "Note" shall include the Note
or Notes issued  following a permitted  transfer or  assignment  of this Note in
whole or in part to a permitted transferee or transferees and shall also include
all Secondary  Notes.  In addition,  after  delivery of an indemnity in form and
substance  satisfactory to the Issuer in its reasonable  discretion,  the Issuer
also  agrees to issue a  replacement  Note if this Note has been  lost,  stolen,
mutilated or destroyed.

         The  Issuer  agrees to record  this Note on the  Register  referred  to
below. A Note recorded on the Register  ("Registered Note") may not be evidenced
by a note other than a Registered  Note and, upon the  registration of the Note,
any promissory note (other than a Registered  Note) evidencing the same shall be
null and void and shall be returned to the Issuer.  The Note,  once  recorded on
the  Register,  may not be  removed  from  the  Register  so long as it  remains
outstanding  and a Registered Note may not be exchanged for a note that is not a
Registered Note.



<PAGE>


         The Issuer shall maintain,  or cause to be maintained,  a register (the
"Register") on which it enters the name of the Holder as the registered owner of
this Note and the outstanding  principal  amount of such Note. A Registered Note
may be assigned or sold in whole or in part,  in a minimum  aggregate  amount of
$1,000,000  (or such lesser amount as  explicitly  provided in the paragraph two
paragraphs  above),  only  by  registration  of such  assignment  or sale on the
Register (and each Registered  Note shall expressly so provide).  Any assignment
or  sale  of all or  part  of  such  Registered  Note  may be  affected  only by
registration  of such  assignment  or sale on the  Register,  together  with the
surrender of the Registered  Note, if any,  evidencing the same duly endorsed by
(or accompanied by a written  instrument of assignment or sale duly executed by)
the  holder  of  such  Registered  Note(s),  whereupon,  at the  request  of the
designated assignee(s) or transferee(s),  one or more new Registered Note in the
same aggregate principal amount shall be issued to the designated assignee(s) or
transferee(s). Prior to the registration of assignment or sale of any Registered
Note,  the Issuer shall treat the person in whose name such  Registered  Note is
registered  as the owner  thereof  for the  purpose of  receiving  all  payments
thereon and for all other purposes.

         In the event that the Holder  sells  participations  in any  Registered
Note,  each in a  minimum  aggregate  amount of  $1,000,000,  the  Holder  shall
maintain a  register  on which it enters  the name of all  participants  in such
Registered  Note  (the  "Participant   Register").  A  Registered  Note  may  be
participated in whole or in part only by registration of such  participation  on
the Participant  Register (and each Registered Note shall expressly so provide).
Any  participation  of  such  Registered  Note  may  be  effected  only  by  the
registration of such participation on the Participant  Register.  No participant
will  have  any  independent  rights  under  this  Note and any  rights  must be
exercised through the Holder.

         Any foreign person who purchases or is assigned or  participates in any
portion  of any  Registered  Note  shall  provide  the  Issuer (in the case of a
purchase or  assignment) or the Holder (in the case of a  participation)  with a
completed Internal Revenue Service Form W-8 (Certificate of Foreign Status) or a
substantially  similar  form  for  such  purchaser,  participant  or  any  other
affiliate who is a holder of beneficial interests in any Registered Note.

         SECTION 1. Certain Terms Defined.  For all purposes of this Note, terms
defined in this Note shall have the  meaning  set forth  herein.  The  following
terms shall have the respective  meanings specified below. Terms defined in this
Note include the plural as well as the singular.

         "Average Closing Price" means, for any date, the (i) sum of the Closing
Price of the Common  Stock  multiplied  by the volume of Common  Stock traded on
such day for the 20  consecutive  Trading Days  immediately  preceding such date
divided by (ii) the  aggregate  volume of Common  Stock  traded  during  such 20
Consecutive Trading Days.

         "Business Day" means any day except a Saturday,  Sunday or other day on
which commercial banks in the City of New York are authorized by law to close.

         "Cash  Premium"  means,  for any Sinking Fund Payment Date,  (i) if the
Average  Closing  Price of the Common  Stock for such  Sinking Fund Payment Date
exceeds the  Conversion  Price,  one plus the amount  obtained  by dividing  the
amount of such excess by the Conversion Price, or (ii) otherwise, one.

       "Closing Date" means the Closing Date under the Asset Purchase Agreement.



<PAGE>


         "Closing  Price" of the Common  Stock on a given  Trading Day means the
average of the high and low price of the Common  Stock for such  Trading Day, as
reported on the AMEX,  or if the Common Stock is not then listed on the AMEX, as
reported by the principal  securities exchange or inter-dealer  quotation system
or OTC Bulletin  Board on which the Common  Stock is then traded.  If the Common
Stock is not reported in any manner  described  above,  the Buyer and holders of
50% or more of the  Notes  shall  agree on the fair  market  value of a share of
Common Stock  (determined  without  giving effect to any discount for a minority
interest or any lack of liquidity of the Common Stock due to the fact that there
may be no public market for the Common Stock).  If the parties fail to agree but
their calculation of the fair market value of a share of Common Stock differs by
less  than  10%,  the  Closing  Price  shall  be  the  average  of  the  parties
calculations; otherwise the parties will select an arbitrator who will determine
the Closing Price by choosing the value  presented by a party which most closely
resembles the fair market value of a share of Common Stock.

         "Common Stock" means the Common Stock, par value $.01 per share,
of the Issuer.

         "Conversion Price" means [$3.00] per share of Common Stock,  subject to
certain adjustments as described in Section 5(g).

         "Debt" of any Person means at any date,  without  duplication,  (i) all
obligations,  including accrued and unpaid interest and premium,  of such Person
for borrowed  money,  (ii) all  obligations  of such Person  evidenced by bonds,
debentures,  notes or other similar  instruments,  (iii) all obligations of such
Person in respect of letters of credit,  bankers'  acceptance  or other  similar
instruments  (or  reimbursement  obligations  with  respect  thereto),  (iv) all
obligations  of such Person to pay the  deferred  purchase  price of property or
services,  except Trade  Payables,  (v) all obligations of such Person as lessee
which  are  capitalized  in  accordance  with  generally   accepted   accounting
principles,  (vi)  all Debt of  others  secured  by a Lien on any  asset of such
Person,  whether or not such Debt is assumed by such Person,  and (vii) all Debt
of others Guaranteed by such Person.

         "Default"  means any condition or event which  constitutes  an Event of
Default  or which  with the  giving of  notice  or lapse of time or both  would,
unless cured or waived, become an Event of Default.

         "Guarantee"  by  any  Person  means  any   obligation,   contingent  or
otherwise,  of such Person directly or indirectly  guaranteeing  any Debt of any
other  Person  and,  without  limiting  the  generality  of the  foregoing,  any
obligation,  direct or indirect,  contingent or otherwise, of such Person (i) to
purchase or pay (or advance or supply funds for the purchase or payment of) such
Debt  of  such  other  Person   (whether   arising  by  virtue  of   partnership
arrangements,  by agreement to keep-well,  to purchase assets, goods, securities
or services,  to take-or-pay,  or to maintain financial statement  conditions or
otherwise)  or (ii) entered into for the purpose of assuring in any other manner
the  obligee of such Debt for the  payment  thereof or to protect  such  obligee
against loss in respect  thereof (in whole or in part);  provided  that the term
Guarantee  shall not  include  endorsements  for  collection  or  deposit in the
ordinary  course  of  business.  The  term  "Guarantee"  used  as a  verb  has a
corresponding meaning.

         "Indenture"  means the  Indenture  dated as of March 14,  1996  between
Issuer and Marine Midland Bank, as trustee.



<PAGE>


         "Lien" means,  with respect to any asset, any mortgage,  lien,  pledge,
charge,  security  interest or encumbrance of any kind in respect of such asset.
For the  purposes of this Note,  the Issuer  shall be deemed to own subject to a
Lien any asset  which it has  acquired  or holds  subject to the  interest  of a
vendor or lessor under any  conditional  sale  agreement,  capitalized  lease or
other title retention agreement relating to such asset.

         "Market Disruption Event" means, with respect to the Common Stock (1) a
suspension, absence or material limitation of trading of the Common Stock on the
primary market for the Common Stock for more than two hours of trading or during
the one-half hour period  preceding  the close of trading in such market;  (2) a
suspension or material  limitation on the primary  market for trading in options
contracts  related to the Common Stock,  if available,  during the one-half hour
period  preceding  the close of trading  in the  applicable  market;  or (3) any
limitation pursuant to the rules of the American Stock Exchange, Section 3, Rule
117 (or any  applicable  rule or regulation  enacted or promulgated by the AMEX,
any other self-regulatory organization or the Securities and Exchange Commission
of  similar  scope) on  trading  during  significant  market  fluctuations.  For
purposes of determining  whether a Market  Disruption Event has occurred:  (1) a
limitation  on the hours or  number of days of  trading  will not  constitute  a
Market  Disruption  Event if it results from an announced  change in the regular
business  hours of the  relevant  exchange;  and (2) a decision  to  permanently
discontinue  trading in the  relevant  options  contract  will not  constitute a
Market Disruption Event.

         "Person" means an individual,  corporation,  limited liability company,
partnership,  association,  trust or other entity or  organization,  including a
government or political subdivision or an agency or instrumentality thereof.

         "Prepayment Date" means the date on which the Issuer makes any
prepayment on the Notes.

         "Prepayment  Price"  means,  for any Note on any  Prepayment  Date,  an
amount in cash equal to the sum of (i) the product of (a) the  principal  amount
of such Note or portion  thereof being prepaid on such  Prepayment  Date and (b)
one plus (1) if the Prepayment  Date is on or prior to the first  anniversary of
the  Closing  Date,  15%,  or (2) if the  Prepayment  Date is  after  the  first
anniversary  of the  Closing  Date the greater of (x) 0.1 and (y) the product of
75% and a fraction,  the numerator of which is the Average  Closing Price of the
Common Stock on such Prepayment  Notice Date minus the Conversion  Price and the
denominator of which is the Conversion  Price,  plus (ii) all accrued but unpaid
interest on the principal  amount of such Note or portion  thereof being prepaid
on such Prepayment Date.

         "Pro Rata Share" means the percentage  that the  outstanding  principal
amount of this Note bears to the aggregate  outstanding  principal amount of all
Notes.

         "Registration Rights Agreement" means the Registration Rights Agreement
made as of the date hereof between Issuer and Seller.



<PAGE>


         "Senior Debt" means (a) any Debt incurred by the Issuer pursuant to the
Healthcare  Receivables Purchase Agreement dated as of July 31, 1996 between the
Issuer and Daiwa  Healthco.  - 2 L.L.C.,  as  amended  from time to time and any
refinancing or replacement  thereof or additions  thereto and (b) all other Debt
of the Issuer  owed to any  banking  institution,  other  than the Senior  Notes
issued pursuant to the Indenture.

         "Sinking Fund Payment Amount" means, for any Sinking Fund Payment Date,
the lesser of (i)  $10,000,000  and (ii) the aggregate  principal  amount of the
Notes then outstanding.

         "Subsidiary"  means any entity of which  securities or other  ownership
interests  having  ordinary  voting  power to elect a  majority  of the board of
directors or other persons performing similar functions are at the time directly
or indirectly owned by the Issuer.

         "Trade  Payables" means accounts  payable or any other  indebtedness or
monetary  obligations to trade creditors created or assumed by the Issuer or any
Subsidiary of the Issuer in the ordinary  course of business in connection  with
the obtaining of materials or services.

         "Trading  Day"  means a day  which  is also a  Business  Day,  on which
trading is generally conducted (i) on the American Stock Exchange, Inc. and (ii)
on any  successor  exchange on which the Common Stock is listed,  and on which a
Market Disruption Event has not occurred.

         SECTION 2.  Events of Default and Remedies.

          (a) Event of Default  Defined;  Acceleration  of  Maturity;  Waiver of
Default.  In case one or more of the  following  events  ("Events  of  Default")
(whatever  the reason for such Event of Default and whether it is  voluntary  or
involuntary  or is effected  by  operation  of law or pursuant to any  judgment,
decree  or  order  of  any  court  or  any  order,  rule  or  regulation  of any
administrative or governmental body) shall have occurred and be continuing:

                  (i) default in payment when due of principal or premium on any
Note in accordance with the terms hereof; or

                 (ii) default in the payment when due of interest on any Note in
         accordance with the terms hereof,  which default continues for a period
         of 10 calendar days after the due date of such payment; or

                (iii) a court having  jurisdiction in the premises shall enter a
         decree or order for relief in  respect of the Issuer in an  involuntary
         case under any applicable  bankruptcy,  insolvency or other similar law
         now or  hereafter  in effect,  or  appointing  a receiver,  liquidator,
         assignee, custodian, trustee, sequestrator (or similar official) of the
         Issuer or for any  substantial  part of the  property  of the Issuer or
         ordering  the winding up or  liquidation  of the affairs of the Issuer,
         and such  decree or order  shall  remain  unstayed  and in effect for a
         period of 60 days; or



<PAGE>


                 (iv) the  Issuer  shall  commence  a  voluntary  case under any
         applicable bankruptcy, insolvency or other similar law now or hereafter
         in  effect,  or  consent  to the  entry of an order  for  relief  in an
         involuntary  case under any such law, or consent to the  appointment or
         taking  possession  by a  receiver,  liquidator,  assignee,  custodian,
         trustee,  sequestrator  (or similar  official) of the Issuer or for any
         substantial  part of the  property of the Issuer,  or the Issuer  shall
         make any general assignment for the benefit of creditors; or

                  (v) an event of default  occurs under any Senior  Debt,  which
         results in the acceleration of such  indebtedness  prior to its express
         maturity,  and the principal amount of any such indebtedness,  together
         with the  principal  amount  of any  other  indebtedness  of which  the
         maturity has been so  accelerated,  aggregates to $5.0 million or more;
         or

                 (vi) the Issuer shall fail to perform its obligations under the
         Registration Rights Agreement and such failure continues for the lesser
         of (i) 30 calendar days or (ii) 5 days after a  registration  statement
         is to be  filed  by  Issuer  or the  effective  date of a  registration
         statement,  as  applicable,  in either  case  after  notice  thereof by
         holders of a majority in principal amount of the Notes;

then,    and in each and every such case, the holders of a majority in principal
         amount of the Notes,  by notice in writing to the  Issuer,  may declare
         the aggregate  outstanding principal amount of the Notes, together with
         accrued interest thereon, to be due and payable  immediately,  and upon
         any such declaration the same shall become immediately due and payable.
         In  such  event,  the  Issuer  shall  pay  each  holder  of a Note  the
         Prepayment Price for such Note, together with accrued interest thereon,
         and  the  Prepayment  Notice  Date  for  purposes  of  calculating  the
         Prepayment  Price  will be  deemed  to be the  date of such  notice  to
         Issuer.

          (b) Powers and  Remedies  Cumulative;  Delay or Omission Not Waiver of
Default.  No right or remedy herein  conferred upon or reserved to the Holder is
intended  to be  exclusive  of any other  right or remedy,  and every  right and
remedy shall,  to the extent  permitted by law, be cumulative and in addition to
every other right and remedy given hereunder or now or hereafter existing at law
or in equity or  otherwise.  The  assertion or employment of any right or remedy
hereunder,  or  otherwise,   shall  not  prevent  the  concurrent  assertion  or
employment of any other appropriate right or remedy. No delay or omission of the
holder of any Note to exercise any right or power  accruing  upon any Default or
Event of Default  occurring and  continuing  as aforesaid  shall impair any such
right or power or shall be construed to be a waiver of any such Default or Event
of Default or an acquiescence  therein; and every power and remedy given by this
Note or by law to the holder of any Note may be exercised from time to time, and
as often as shall be deemed expedient, by such holder.



<PAGE>


          (c)  Waiver  of Past  Defaults.  If a  Default  or  Event  of  Default
hereunder is waived in  accordance  with Section 9, the Issuer and the holder of
each Note shall be  restored to their  former  positions  and rights  hereunder,
respectively; but no such waiver shall extend to any subsequent or other Default
or impair any right consequent thereon. Upon any such waiver, such Default shall
cease to exist and be deemed to have been  cured and not to have  occurred,  and
any Default or Event of Default  arising  therefrom shall be deemed to have been
cured,  and not to have  occurred  for every  purpose of the Notes;  but no such
waiver shall extend to any  subsequent  or other  Default or Event of Default or
impair any right consequent thereon.

                  SECTION 3.  Covenants.  The Issuer agrees that, so long as
any amount  payable  under this Note remains  unpaid,  the Issuer shall deliver
to the Holder:

          (a) within  five days after any officer of the Issuer  obtains  actual
knowledge of any Default,  a certificate of the chief  financial  officer or the
chief accounting officer of the Issuer setting forth the details thereof and the
action which the Issuer is taking or proposes to take with respect thereto;

          (b)  promptly  upon the  filing  thereof,  the  quarterly  and  annual
financial  reports that the Issuer is required to file with the  Securities  and
Exchange  Commission  pursuant to Section 13 or Section 15(d) of the  Securities
Exchange  Act of 1934 or, in the event the Issuer is not  required  to file such
reports,  reports  containing  substantially  the same  information  as would be
required in such reports (it being  understood  that the foregoing  shall not be
construed  to require  presentation  in the manner  required by such Act and the
regulations thereunder so long as the data required thereunder is so provided).

                  SECTION 4.   Prepayments.

          (a) Issuer's Option to Prepay.  At any time and from time to time, the
Issuer may prepay the outstanding  principal amount of the Notes, in whole or in
part, by paying to each holder of a Note the  Prepayment  Price for such Note on
the Prepayment Date, together with accrued but unpaid interest thereon,  upon at
least ten Business  Days' prior written notice to the holders of the Notes (such
date being the "Prepayment Notice Date").

          (b)  Prepayment  on Asset Sale.  Upon the sale by the Issuer of all or
substantially  all of its assets and entry into a definitive  plan to distribute
the proceeds of such asset sale to the holders of the Common  Stock,  the Issuer
shall pay to each holder of a Note prior to the distribution of such proceeds to
the holders of Common Stock, an amount in cash equal to the Prepayment Price for
such Note,  together with accrued but unpaid interest  thereon.  For purposes of
calculating  the  Prepayment  Price,  the  sum of  the  value  of  the  proceeds
distributed  in respect of each share of Common Stock in such  distribution  and
the expected value of each share of Common Stock after such  distribution  (each
as  determined  by the  Issuer's  board of directors  in  consultation  with its
independent financial advisors) shall be deemed the Average Closing Price on the
Prepayment Notice Date.



<PAGE>


          (c)  Prepayment on Tender  Offer.  Upon the  consummation  of a tender
offer that would  result in the  offeror or  offerors  owning 90% or more of the
Common  Stock,  the Issuer  shall pay to each holder of a Note an amount in cash
equal to the  Prepayment  Price for such Note,  together with accrued but unpaid
interest thereon. For purposes of calculating the Prepayment Price, the value of
the amount  being paid in the  tender  offer for each share of Common  Stock (as
determined by the Issuer's  independent  financial advisors) shall be deemed the
Average  Closing Price on the Prepayment  Notice Date. The Issuer shall pay each
Holder the Prepayment  Price on or prior to the date holders of the Common Stock
receive their consideration for the tender offer.

          (d)   Notice of Prepayment; Subsequent Rights of Holders.

                  (i) The notice of prepayment  pursuant to Sections 4(a),  4(b)
         and 4(c) shall be given by first class mail,  postage  prepaid,  to the
         Holder at such  Holder's  address as the same appears on the  Register.
         Each such notice shall state:  (i) the proposed  Prepayment  Date, (ii)
         the  aggregate  principal  amount of Notes to be prepaid and, if only a
         portion of the Notes is to be prepaid,  the aggregate  principal of the
         Notes to be prepaid;  (iii) the place or places  where the Notes are to
         be  surrendered  for  payment of the  Prepayment  Price;  and (iv) that
         interest on the portion of the Notes to be prepaid will cease to accrue
         on the Prepayment Date.

                 (ii) Notice having been mailed as aforesaid, from and after the
         Prepayment  Date  (unless  default  shall  be  made  by the  Issuer  in
         providing money for the payment of the Prepayment  Price of the Note or
         portion thereof called for prepayment), interest on the Note or portion
         thereof so called for prepayment shall cease to accrue,  and all rights
         of the Holder with  respect to the Note or portion  thereof  called for
         prepayment  (except the right to receive from the Issuer the Prepayment
         Price with respect  thereto) shall cease.  Upon surrender in accordance
         with said  notice of the  certificate  for any Note so  prepaid in full
         (properly endorsed or assigned for transfer,  if the Board of Directors
         of the Issuer  shall so require  and the notice  shall so state),  such
         Note (or portion  thereof,  as the case may be) shall be prepaid by the
         Issuer at the aforesaid  Prepayment  Price. In case the Note is prepaid
         in part, the Holder shall make an appropriate notation to evidence such
         prepayment on Schedule A attached hereto.

                  SECTION 5.  Sinking Fund Payments.

          (a)   Issuer's Obligation to Make Sinking Fund Payments; Conversion
          Rights.



<PAGE>


                  (i) The Issuer shall pay to each holder of any Note on each of
         [Anniversary Date], 2000, [Anniversary Date], 2001, [Anniversary Date],
         2002 and [Anniversary  Date],  2003, if necessary (each a "Sinking Fund
         Payment  Date") such Note's Pro Rata Share of the Sinking  Fund Payment
         Amount for such Sinking Fund Payment  Date,  together  with accrued but
         unpaid interest  thereon.  Subject to Section 6, the Issuer may pay the
         Sinking Fund Payment  Amount on any Sinking Fund Payment  Date,  at the
         Issuer's  option,  by (x)  converting  the entire  Sinking Fund Payment
         Amount into Common Stock as provided in Section  5(a)(ii)  below or (y)
         either paying cash for the entire Sinking Fund Payment Amount or paying
         cash for a portion and converting the remaining portion of such Sinking
         Fund  Payment  Amount  into Common  Stock,  in each case as provided in
         Section  5(a)(iii)  below. The payment of a Sinking Fund Payment Amount
         in  accordance  with  Section  5(a)(ii)  or (iii)  shall  constitute  a
         repayment  of the  outstanding  principal  amount  of this  Note by the
         amount of this  Note's  Pro Rata  Share of such  Sinking  Fund  Payment
         Amount,  and  the  outstanding  principal  amount  of this  Note  shall
         thereupon be reduced by such amount.

                 (ii) If the Issuer elects to pay a Sinking Fund Payment  Amount
         by converting the entire Sinking Fund Payment Amount into Common Stock,
         a portion  of this Note  equal to 75% of this  Note's Pro Rata Share of
         such Sinking Fund Payment  Amount shall be converted  into Common Stock
         at a conversion price per share of Common Stock equal to the Conversion
         Price and a portion of this Note  equal to 25% of this  Note's Pro Rata
         Share of such  Sinking Fund  Payment  Amount  shall be  converted  into
         Common Stock at a  conversion  price per share of Common Stock equal to
         the Average  Closing  Price on such  Sinking  Fund  Payment  Date.  The
         delivery  of such  shares to the  Holder  in  accordance  with  Section
         5(b)(iii)  shall  constitute  payment of this  Note's Pro Rata Share of
         such Sinking Fund Payment Amount on the applicable Sinking Fund Payment
         Date.

                (iii) If the  Issuer  elects to pay cash for an  entire  Sinking
         Fund  Payment  Amount or to pay cash for a portion  and to convert  the
         remaining portion of such Sinking Fund Payment Amount into Common Stock
         the following shall apply:

                           (A) If the Issuer  elects to pay cash for 25% or less
                  of the Sinking Fund Payment Amount,  then (x) the Issuer shall
                  deliver to the Holder on the Sinking  Fund  Payment  Date this
                  Note's Pro Rata share of such cash; (y) a portion of this Note
                  equal to this  Note's  Pro Rata  Share of 75% of such  Sinking
                  Fund Payment  Amount shall be converted into Common Stock at a
                  conversion  price equal to the  Conversion  Price per share of
                  Common Stock;  and (z) a portion of this Note equal to its Pro
                  Rata  Share of the  remaining  portion  of such  Sinking  Fund
                  Payment Amount (after deducting the cash paid under clause (x)
                  and  75%  of  such  Sinking  Fund  Payment  Amount)  shall  be
                  converted into Common Stock at a conversion price equal to the
                  Average Closing Price on such Sinking Fund Payment Date.

                           (B) If the  Issuer  elects  to pay cash for more than
                  25% of the Sinking  Fund Payment  Amount,  then (x) the Issuer
                  shall  deliver to the Holder on the Sinking  Fund Payment Date
                  cash  equal to this  Note's  Pro Rata  Share of (I) 25% of the
                  Sinking Fund Payment  Amount plus (II) the product of the Cash
                  Premium times the  additional  portion in excess of 25% of the
                  Sinking Fund Payment  Amount that the Issuer  elects to pay in
                  cash;  and (y) a portion  of this  Note  equal to its Pro Rata
                  Share of the  remaining  portion of the Sinking  Fund  Payment
                  Amount  (after  deducting  the  portion  of the  Sinking  Fund
                  Payment  Amount  paid in  cash  under  clause  (x))  shall  be
                  converted into Common Stock at a conversion price per share of
                  Common Stock equal to the Conversion Price.

                  (b)    Exercise Procedure.



<PAGE>


                  (i) The Issuer shall deliver written notice of its election to
         convert  or pay cash for the  Notes  in  whole or in part  pursuant  to
         Section 5(a)(ii) or (iii) by first class mail, postage prepaid,  mailed
         on the Sinking Fund Payment Date to the Holder at such Holder's address
         as the same appears on the Register.  Promptly upon receipt of any such
         notice,  the  Holder  shall  surrender  this Note at the  office of the
         Issuer if this Note shall thereby be paid in full.

                 (ii) As promptly as  practicable,  and in any event  within ten
         Business  Days,  after the  surrender by the Holder as aforesaid if the
         Note is paid in full or  delivery of the written  notice  described  in
         Section  5(b)(i)  above if the Note is paid in part,  the Issuer  shall
         issue and deliver to such Holder (i) a certificate or certificates  for
         the number of shares of Common Stock  issuable  upon the  conversion of
         this Note in accordance  with the provisions of this Section 5 and (ii)
         cash in accordance  with the provisions of this Section 5 and the third
         paragraph  of this  Note.  If the Note is not paid in full,  the Holder
         shall make an  appropriate  notation  to evidence  the Note's  Pro-Rata
         Share of the Sinking  Fund  Payment on  Schedule A attached  hereto and
         deliver a copy of it to the Issuer.

                (iii) Each payment or conversion pursuant to Section 5(a)(ii) or
         (iii) and in accordance  with this Section 5(b) shall be deemed to have
         been effected on the Sinking Fund Payment Date, and the Person in whose
         name or names any  certificate  or  certificates  for  shares of Common
         Stock shall be issuable  upon such  conversion  shall be deemed to have
         become the holder of record of the shares of Common  Stock  represented
         thereby at such time on such date and such conversion shall be into the
         number of shares of Common Stock  determined  by dividing the principal
         amount  of the Note  being  converted  at such  time by the  applicable
         conversion  price  specified  therein  (subject  to Section  5(f) as it
         relates to  fractional  shares).  All shares of Common Stock  delivered
         upon  conversion  of this Note will upon  delivery  be duly and validly
         issued and fully paid and non-assessable, free of all Liens and charges
         and not subject to any preemptive rights. Upon the conversion of all or
         any portion of this Note,  the principal  amount so converted  shall no
         longer be deemed to be  outstanding  and all rights of the Holder  with
         respect  to this Note or portion  thereof  surrendered  for  conversion
         shall  immediately  terminate  except the right to  receive  the Common
         Stock and other amounts, if any, issuable pursuant to this Section 5.

          (c)  Effect  of  Election.  If the  Issuer  delivers  a notice  of its
election to  exercise  its right to convert or pay in cash all or any portion of
the Notes, interest shall cease to accrue on the applicable Sinking Fund Payment
Date with respect to the principal amount so converted or paid in cash. From and
after such Sinking Fund  Payment  Date,  the Holder of this Note with respect to
the principal amount so converted shall participate equally and ratably with the
holders of shares of Common Stock in all  dividends  paid on the Common Stock as
if such principal  amount had been converted into shares of Common Stock at such
time.



<PAGE>


          (d)   Issuance of Shares.

                  (i) The Issuer  covenants  that it shall at all times  reserve
         and keep  available,  free from preemptive  rights,  such number of its
         authorized  but unissued  shares of Common Stock as may be required for
         the purpose of effecting any conversion hereunder.

                 (ii) Prior to the delivery of any  securities  which the Issuer
         shall be obligated to deliver upon  conversion of this Note, the Issuer
         shall comply with respect to the issuance of such  securities  with all
         applicable  federal and state laws and regulations which require action
         to be taken by the Issuer.

          (e) Taxes on Conversion.  The Issuer will pay any and all documentary,
stamp or  similar  issue or  transfer  taxes  payable in respect of the issue or
delivery of shares of Common Stock on conversion  of this Note pursuant  hereto;
provided  that the  Issuer  shall  not be  required  to pay any tax which may be
payable in respect of any transfer  involving the issue or delivery of shares of
Common  Stock in a name  other  than  that of the  Holder  and no such  issue or
delivery  of such  Common  Stock  shall be made  unless  and  until  the  Person
requesting  such issue or delivery has paid to the Issuer the amount of any such
tax or has  established,  to the  satisfaction of the Issuer,  that such tax has
been paid.

          (f) No Fractional  Shares.  In connection  with the conversion of this
Note or a portion  hereof,  no  fractions  of shares  of Common  Stock  shall be
issued, but in lieu thereof the Issuer shall pay a cash adjustment in respect of
such  fractional  interest  in an  amount  equal  to  such  fraction  of a share
multiplied by the Average  Closing Price on the applicable  Sinking Fund Payment
Date.

          (g)   Anti-Dilution.  The terms of  conversion  of all or a portion
of this Note  pursuant to this Section 5 shall be subject to the following
adjustments:



<PAGE>


                  (i) If the Issuer  shall (A) declare and pay to the holders of
         the Common Stock a dividend or other distribution payable in additional
         shares of Common Stock or other securities or rights  convertible into,
         or entitling the holder thereof to receive  additional shares of Common
         Stock (hereinafter referred to as the "Common Stock Equivalents"),  (B)
         split or  subdivide  the  outstanding  shares  of Common  Stock  into a
         greater number of shares of Common Stock,  (C) combine the  outstanding
         shares of Common Stock into a lesser number of shares,  or (D) issue by
         reclassification  of its shares of Common Stock any other shares of the
         Issuer,  the Conversion Price in effect immediately prior thereto shall
         be adjusted by  multiplying  the  Conversion  Price by a fraction,  the
         numerator  of which  shall be the number of shares of Common  Stock and
         Common Stock Equivalents  outstanding immediately prior to such action,
         and the  denominator  of which  shall be the number of shares of Common
         Stock and Common Stock Equivalents  outstanding  immediately  following
         such action.  Such  adjustment  shall be made whenever any event listed
         above  shall occur and shall  become  effective  immediately  after the
         record date in the case of a dividend or  distribution  and immediately
         after  the  effective  date  in the  case  of any  split,  subdivision,
         combination or reclassification.

                 (ii)  If the  Issuer  shall  effect  a  reorganization,  equity
         recapitalization,   shall  merge  with  or  consolidate   into  another
         corporation or entity, or shall sell,  transfer or otherwise dispose of
         all or  substantially  all of its  property,  assets or  business  and,
         pursuant to the terms of such reorganization,  equity recapitalization,
         merger,  consolidation  or  disposition  of assets,  shares of stock or
         other securities, property or assets of the Issuer, or of its successor
         or  transferee  or an  affiliate  of any  thereof,  or  cash  are to be
         received by or distributed  to the holders of Common Stock,  the holder
         of any Note thereafter surrendered for conversion pursuant to Section 5
         shall be  entitled  to  receive  the number of shares of stock or other
         securities,  property or assets of the Issuer,  or of its  successor or
         transferee or any affiliate  thereof,  or cash  receivable upon or as a
         result  of  such  reorganization,   equity  recapitalization,   merger,
         consolidation  or  disposition of assets or the cash value thereof that
         would have been  received by a holder of the number of shares of Common
         Stock  equal to the  number of shares the holder of the Note would have
         received  if the  converted  portion  of such  Note had been  converted
         immediately  prior to such  event at the  applicable  conversion  price
         immediately  prior to such event.  The provisions of this  subparagraph
         (ii) shall  similarly  apply to  successive  reorganizations,  mergers,
         consolidations  or  dispositions  of  assets  and  shall  be  effective
         immediately after the effective date of any such event.

                (iii)  Whenever  the  terms  of  conversion  shall  be  adjusted
         pursuant to this Section 5(g), the Issuer shall forthwith  obtain,  and
         cause to be delivered to the holders of the Notes, a certificate signed
         by the principal financial or accounting officer of the Issuer, setting
         forth in reasonable  detail the event  requiring the adjustment and the
         method by which such adjustments were calculated and specifying the new
         Conversion Price. In the cases referred to in subparagraph (ii), such a
         certificate  shall be issued  describing  the amount and kind of stock,
         securities,  property or assets or cash which shall be receivable  upon
         conversion  of the Note after giving  effect to the  provisions of such
         subparagraph.

                 (iv) No adjustment to the Conversion  Price or conversion price
         shall be required unless such  adjustment  would require a change of at
         least 1% in such rate; provided, however, that any adjustments which by
         reason of this  paragraph  (iv) are not  required  to be made  shall be
         carried forward and taken into account in any subsequent adjustment.



<PAGE>


                  SECTION  6.  Limitation  on  Potential   Issuance  of  Shares.
         Notwithstanding any other provision herein to the contrary,  the Issuer
         shall  not be  permitted  to pay  interest  on this  Note  through  the
         issuance  of  additional  Notes or to convert  all or any  portion of a
         Sinking Fund  Payment  Amount into Common  Stock,  but instead must pay
         cash pursuant to the terms hereof, to the extent that any such issuance
         or  conversion  (i) would have the result  that the past,  present  and
         potential  issuance of Common Stock under the Asset Purchase  Agreement
         (including  the  Common  Stock  and Note  issuable  thereunder  and any
         Secondary  Notes) could result in there having been,  as of the Closing
         Date  under the Asset  Purchase  Agreement,  a  potential  increase  in
         outstanding  Common Shares of 20% or more, unless the Issuer shall have
         obtained  any  required  approval  of its  shareholders,  or (ii) would
         violate any applicable law, rule, regulation,  judgment,  injunction or
         decree.

                  SECTION 7.  Subordination.

          (a)  Subordination to Senior Debt. The Issuer and the Holder agree for
the benefit of the Senior Debt  holders that all  indebtedness  evidenced by the
Notes, including principal, premium, if any, and interest, and all other amounts
payable  to the  holder  of any  Note  (including  any  payment  in  respect  of
prepayment  or  purchase  or other  acquisition  hereof)  shall,  in the  manner
hereinafter  set  forth,  be  subordinate  and junior in right of payment to all
Senior Debt of the Issuer.  All  indebtedness  evidenced by the Notes shall rank
pari passu to all Debt of the Issuer other than Senior Debt.

                  (b)  Issuer  Not  to  Make   Payments   Hereunder  in  Certain
         Circumstances. Without limiting the generality of the foregoing:

                  (i) Upon the maturity of all or any part of the Senior Debt by
         lapse of time, acceleration or otherwise,  such Senior Debt shall first
         be paid in full,  or such payment shall be duly provided for in cash or
         in a manner satisfactory to the holders of such Senior Debt, before any
         payment  by the  Issuer or any  Subsidiary  is made on  account  of the
         principal  of or premium,  if any, or interest on any Note or to prepay
         any Note.

                 (ii) In the event and during the continuation of any default in
         respect of any Senior Debt, including,  without limitation, any default
         arising  from either a default in the payment of  principal or interest
         in respect of any Senior  Debt (each such  default  being  referred  to
         herein as a "Senior Debt  Default"),  no payment  (other than in Common
         Stock) shall be made by the Issuer on or with respect to the  principal
         of, or, premium, if any, or interest on, any Note or to prepay any Note
         unless and until such Senior Debt Default shall have been remedied, nor
         shall any such payment be made if after giving  effect,  as if paid, to
         such payment,  any Senior Debt Default would exist.  In any such event,
         no holder of any Note shall  demand,  accept or receive,  any direct or
         indirect  payment  (in cash or property  other than Common  Stock or by
         setoff, exercise of contractual or statutory rights or otherwise) of or
         on account of any Note, notwithstanding the terms of the Note or of any
         agreement or  instrument  which  governs the Note,  and no such payment
         shall be due,  unless such payment is not prohibited by, and is made in
         accordance  with the terms  of,  any  covenant  or  restriction  in any
         agreement or instrument  governing the Senior Debt,  and the failure to
         make any payment on or with  respect to the Notes by reason of any such
         covenant or  restriction  shall not  constitute a breach of, or default
         under, any provision applicable to any Note.



<PAGE>


                (iii) At any time when a Senior Debt Default exists,  the Issuer
         shall not  make,  and no holder  of any Note  shall  demand,  accept or
         receive (in cash or property or by setoff,  exercise of  contractual or
         statutory rights or otherwise), or shall attempt to collect or commence
         any legal  proceedings  to collect,  any direct or indirect  payment on
         account  of any Note  prior to the date such  payment  becomes  due and
         payable pursuant to the terms thereof or, if later,  prior to the first
         date such  amount is not  prohibited  from being paid  pursuant to this
         Section 7. Notwithstanding the foregoing,  the holder of any Note shall
         be  entitled  to accept  and  retain any  Common  Stock  issuable  upon
         conversion  of such Note,  in whole and in part,  pursuant to Section 5
         hereof.

                 (iv) At any time when a Senior Debt Default  exists,  no holder
         of any Note will  commence  or maintain  any action,  suit or any other
         legal or  equitable  proceeding  against the  Issuer,  or join with any
         creditor  in any such  proceeding,  under any  insolvency,  bankruptcy,
         receivership,  liquidation, reorganization or other similar law, unless
         the holders of Senior Debt shall also join in bringing such proceeding,
         provided that this Section 7(b) shall not prohibit a holder of any Note
         from  filing a proof of claim or  otherwise  participating  in any such
         proceeding not commenced by it.

          (c)  Note  Subordinated  to  Prior  Payment  of  all  Senior  Debt  on
Dissolution,  Liquidation  or  Reorganization  of  Issuer.  In the  event of any
insolvency  or  bankruptcy  proceedings,  and  any  receivership,   liquidation,
reorganization  or other similar  proceedings,  relative to the Issuer or to its
creditors, in their capacity as creditors of the Issuer, or to substantially all
of its property,  and in the event of any proceedings for voluntary liquidation,
dissolution  or  other  winding  up of the  Issuer,  whether  or  not  involving
insolvency or bankruptcy,

                  (i) the  holders of all Senior Debt shall first be entitled to
         receive  payment in full of the  principal  thereof,  premium,  if any,
         interest and all other amounts  payable  thereon  (accruing  before and
         after the  commencement of the  proceedings,  whether or not allowed or
         allowable  as a claim in such  proceedings)  before  the  holder of the
         Notes  shall be  entitled  to  receive  any  payment  on account of the
         principal of, premium, if any, or interest on the Notes; and

                 (ii) the Notes shall  forthwith  (notwithstanding  the terms of
         Section 7(b)) become due and payable and any payment or distribution of
         assets  of the  Issuer  of any  kind or  character,  whether  in  cash,
         property  or  securities  to which  the  holder  of any  Note  would be
         entitled,  but for the  provisions  of this Section 7, shall be paid or
         distributed by the liquidating  trustee or agent or other person making
         such  payment  or  distribution,  whether  the  debtor,  a  trustee  in
         bankruptcy,  a receiver  or  liquidating  trustee  or other  trustee or
         agent,  directly  to any  representative  on behalf of the  holders  of
         Senior  Debt,  to the extent  necessary  to make payment in full of all
         principal,  premium,  if any, interest and all other amounts payable on
         all Senior Debt remaining unpaid, after giving effect to any concurrent
         payment or distribution to the holders of the Senior Debt.

          (d)   Rights of Holders of Senior Debt; Subrogation.



<PAGE>


                  (i) Should any  payment or  distribution  or  security  or the
         proceeds of any thereof be  collected  or received by the holder of any
         Note in  respect  of such  Note,  and such  collection  or  receipt  is
         prohibited  hereunder  prior to the payment in full of the Senior Debt,
         such  holder  will  forthwith  deliver  the same to the  holders of the
         Senior  Debt for the equal and  ratable  benefit of the  holders of the
         Senior Debt in precisely the form received  (except for the endorsement
         or the assignment of or by such holder where necessary) for application
         to payment  of all  Senior  Debt in full,  after  giving  effect to any
         concurrent  payment or  distribution to the holders of Senior Debt and,
         until so  delivered,  the same shall be held in trust by such holder as
         the property of the holders of the Senior Debt.

                 (ii) No holder of any Note shall be subrogated to the rights of
         the holders of the Senior Debt to receive  payments or distributions of
         assets of the Issuer  until all  amounts  payable  with  respect to the
         Senior  Debt  shall  be paid in full;  and,  for the  purposes  of such
         subrogation,  no payments or distributions to the holder of any Note of
         any cash, property or securities to which such holder would be entitled
         except for these provisions shall, as between the Issuer, its creditors
         other than the holders of the Senior  Debt,  and such holders of Notes,
         be deemed to be a payment  by the Issuer to or on account of the Senior
         Debt. The provisions of this Section 7 are and are intended  solely for
         the  purpose of  defining  the  relative  rights of the  holders of the
         Notes,  on the one hand,  and the  holders of the Senior  Debt,  on the
         other hand.

                (iii)  Subject to the  payment in full of all Senior  Debt,  the
         holders of the Notes shall be subrogated  (equally and ratably with the
         holders of all  subordinated  indebtedness  of the Issuer which, by its
         terms, is not superior in right of payment to the Notes, and ranks on a
         parity  with the Notes) to the rights of the  holders of Senior Debt to
         receive payments or  distributions  of cash,  property or securities of
         the Issuer applicable to the Senior Debt until all amounts owing on the
         Notes  shall be paid in full.  For  purposes  of such  subrogation,  no
         payments or distributions to the holder of any Note of cash,  property,
         securities or other assets by virtue of the subrogation herein provided
         which  otherwise would have been made to the holders of the Senior Debt
         shall,  as between the Issuer,  its creditors other than the holders of
         Senior Debt and the holders of the Notes,  be deemed to be a payment to
         or on account of the Note.  The Holder  agrees that,  in the event that
         all or any part of any  payment  made on account of the Senior  Debt is
         recovered  from the holders of Senior Debt as a preference,  fraudulent
         transfer or similar payment under any bankruptcy, insolvency or similar
         law, any payment or distribution received by the Holder of this Note on
         account  of the  Note at any time  after  the  date of the  payment  so
         recovered, whether pursuant to the right of subrogation provided for in
         this  Section  7(d)(iii)  or  otherwise,  shall be  deemed to have been
         received by such Holder in trust as the  property of the holders of the
         Senior Debt and such Holder  shall  forthwith  deliver the same for the
         equal  and  ratable  benefit  to the  holders  of the  Senior  Debt for
         application to payment of all Senior Debt in full.

          (e) Renewals,  Extensions  and Increases of Senior Debt. The holder of
each  Note by its  acceptance  thereof  thereby  waives  any and all  notice  of
renewal, extension, accrual or increase in the amount of Senior Debt, present or
future,  and agrees and consents that without  notice to or assent by the holder
of any Note:



<PAGE>


                  (i) the  Issuer  shall  be  permitted  to incur  Senior  Debt,
         including, without limitation, Senior Debt not in existence on the date
         hereof;

                 (ii) the obligation and  liabilities of the Issuer or any other
         party or parties for or upon the Senior Debt (or any  promissory  note,
         security  document or guaranty  evidencing  or securing  the same) may,
         from  time  to  time,  in  whole  or in  part,  be  renewed,  extended,
         increased, modified, amended, accelerated,  compromised,  supplemented,
         terminated, sold, exchanged, waived or released;

                (iii) any representative  acting on behalf of the holders of any
         Senior Debt and any holder of the Senior  Debt may  exercise or refrain
         from exercising any right,  remedy or power granted by or in connection
         with any agreements relating to the Senior Debt; and

                 (iv) any  balance or  balances  of funds with any holder of the
         Senior Debt at any time  standing to the credit of the Issuer may, from
         time to time, in whole or in part, be surrendered or released;

all as any representative or  representatives  acting on behalf of any holder of
the Senior  Debt and any holder of the Senior  Debt may deem  advisable  and all
without   impairing,   abridging,   diminishing,   releasing  or  affecting  the
subordination of the Notes to the Senior Debt provided for herein.

          (f)  Obligation  of Issuer  Unconditional.  Nothing  contained in this
Section 7 or in any other provision of this Note is intended to or shall impair,
as between the Issuer,  its creditors other than the holders of the Senior Debt,
and the holders of the Notes,  the  obligation of the Issuer,  which is absolute
and unconditional, to pay to the holders of the Notes the principal of, premium,
if any,  and  interest  on the Note,  as and when the same shall  become due and
payable  (except as to the timing and procedures for payment as provided in this
Section 7), by lapse of time,  acceleration  or otherwise,  in  accordance  with
their  terms,  or is  intended  to or shall  affect the  relative  rights of the
holders of the Notes and other creditors of the Issuer other than the holders of
the Senior Debt, nor shall anything herein or therein prevent the holders of the
Notes (i) from taking all appropriate actions to preserve their rights under the
Notes not  inconsistent  with the rights of the holders of the Senior Debt under
this  Section 7, or (ii) from  exercising  all remedies  otherwise  permitted by
applicable law upon default under the Note, subject to the rights, if any, under
this Section 7 of the holders of the Senior Debt in respect of cash, property or
securities of the Issuer otherwise payable or delivered to such holders upon the
exercise of any such remedy.

         (g) Miscellaneous.

                  (i) The holder of each Note by its acceptance  thereof thereby
         acknowledges and agrees that the holders of the Senior Debt have relied
         upon and will  continue  to rely upon the  subordination  provided  for
         herein in entering into the  agreements  relating to Senior Debt and in
         extending credit to the Issuer pursuant thereto.


<PAGE>



                 (ii) No  present  or  future  holder of  Senior  Debt  shall be
         prejudiced in its right to enforce the  subordination  contained herein
         in accordance with the terms hereof by any act or failure to act on the
         part  of the  Issuer  or the  holder  of any  Note.  The  subordination
         provisions  contained  herein are for the benefit of the holders of the
         Senior  Debt  from  time  to  time  and,  so  long  as  Senior  Debt is
         outstanding  under any  agreement,  may not be  rescinded,  canceled or
         modified in any way without the prior  written  consent  thereto of all
         holders of Senior Debt.

                (iii) The subordination  provisions hereof shall be binding upon
         each  holder  of any Note and upon the  heirs,  legal  representatives,
         successors and assigns of each such holder; and, to the extent that the
         holder  of any  Note is  either a  partnership  or a  corporation,  all
         references  herein to the holder of any Note shall be deemed to include
         any  successor or  successors,  whether  immediate  or remote,  to such
         partnership or corporation.

                  SECTION 8.  Representations by Holder.  Each holder of a Note
         by its acceptance  thereof  represents and warrants to the Issuer and
         the prior holders of such Note as follows:

          (a) Investment Purpose.  Such holder (i) is acquiring the Note and any
Secondary  Notes and (ii) upon  conversion  of the Note will  acquire the Common
Stock then  issuable  for its own  account and not with a view  towards,  or for
resale in  connection  with,  the public sale or  distribution  thereof,  except
pursuant to sales registered under or exempted from the 1933 Act.

          (b)  Accredited   Investor  Status.  Such  holder  is  an  "accredited
investor" as that term is defined in Rule 501(a) of Regulation D as  promulgated
by the  Securities and Exchange  Commission  ("SEC") under the Securities Act of
1933, as amended ("1933 Act").

          (c) Reliance on Exemptions. Such holder understands that the Note, any
Secondary  Notes and any Common Stock  issuable  hereunder is being and shall be
issued  to  it  in  reliance  on  specific   exemptions  from  the  registration
requirements  of United States  federal and state  securities  laws and that the
Issuer is relying  in part upon the truth and  accuracy  of,  and such  holder's
compliance with, the representations,  warranties,  agreements,  acknowledgments
and  understandings  of such holder set forth herein in order to  determine  the
availability  of such  exemptions and the  eligibility of such holder to acquire
the Note and any Secondary Notes and Common Stock.



<PAGE>


          (d)  Transfer  or  Resale.  Such  holder  understands  that  except as
otherwise  provided in the  Registration  Rights  Agreement (i) the Note and the
Secondary  Notes and Common Stock  issuable  hereunder have not been and are not
being registered under the 1933 Act or any state securities laws, and may not be
offered  for  sale,  sold,   assigned  or  transferred   unless  (A)  registered
thereunder,  (B) the Note and the  Secondary  Notes and Common Stock to be sold,
assigned or  transferred  may be sold,  assigned or  transferred  pursuant to an
exemption from such registration,  or (C) such Note,  Secondary Notes and Common
Stock can be sold,  assigned or transferred  pursuant to Rule 144; (ii) any sale
of the Note, Secondary Notes or Common Stock issuable hereunder made in reliance
on Rule  144 may be made  only in  accordance  with  the  terms  of Rule 144 and
further, if Rule 144 is not applicable,  any resale under circumstances in which
the seller (or the person  through whom the sale is made) may be deemed to be an
underwriter  (as that term is  defined in the 1933 Act) may  require  compliance
with some other exemption under the 1933 Act or the rules and regulations of the
SEC  thereunder;  and (iii) neither the Issuer nor any other person is under any
obligation  to  register  such  securities  under  the  1933  Act or  any  state
securities  laws or to comply  with the terms and  conditions  of any  exemption
thereunder.

                  SECTION 9. Setoff in Asset Purchase Agreement.  Each holder of
         any Note by its acceptance  thereof thereby  acknowledges and agrees in
         the event of a breach of Section 5.08 of the Asset Purchase  Agreement,
         that the Issuer has certain  limited  rights  under the Asset  Purchase
         Agreement  to  set-off  and  recoup any  principal,  interest  or other
         amounts  payable by it to the holder of any Note hereunder  against any
         amounts  payable to the Issuer by Seller  thereunder  or in  connection
         therewith,  whether  or not the holder of any Note is the  Seller,  and
         that such right may have the result of  decreasing  any or all  amounts
         payable by the Issuer to the holders of the Notes.

                  SECTION 10.  Modification of the Notes.  Any provision of this
         Note may be amended or waived if, but only if, such amendment or waiver
         is in writing and is signed by the Issuer and the holders of a majority
         in principal  amount of the Notes;  provided that no such  amendment or
         waiver shall,  unless  signed by each holder:  (a) reduce the principal
         amount of any Note,  the amount of any Sinking Fund  Payment  Amount or
         the  interest  rate payable  under the Notes,  (b) postpone any Sinking
         Fund  Payment  Date or any  date  fixed  for any  payment  of  interest
         hereunder,  (c) modify Section  5(a)(ii) or (iii),  Section 5(g) or the
         definition  of any defined  term used therein in such a manner as to be
         materially  disadvantageous  to the holders of the Notes, or (d) modify
         this Section 10 or otherwise  change the  percentage  of the  principal
         amount of the Notes required for taking any action hereunder.

                  SECTION 11. Payments by Issuer.  THE PRINCIPAL  AMOUNT OF THIS
         NOTE  OUTSTANDING  MAY BE LESS THAN THE AMOUNT SET FORTH IN SCHEDULE A.
         THE  ISSUER  SHALL  ONLY BE LIABLE  TO THE  HOLDER OF THIS NOTE FOR THE
         AMOUNT LISTED ON THE REGISTER  ABSENT  MATHEMATICAL  ERROR.  THE HOLDER
         ACKNOWLEDGES  AND AGREES BY THE ACCEPTANCE OF THIS NOTE THAT THE AMOUNT
         SET FORTH ON THE REGISTER SHALL BE THE OUTSTANDING  PRINCIPAL AMOUNT OF
         THIS NOTE ABSENT MATHEMATICAL ERROR.

                  SECTION 12.  Governing Law. THIS NOTE SHALL BE GOVERNED BY AND
         BE  CONSTRUED  IN  ACCORDANCE  WITH THE  LAWS OF THE  STATE OF NEW YORK
         WITHOUT REGARD TO THE CONFLICTS OF LAW RULES OF SUCH STATE.

                  SECTION 13.  Miscellaneous.  Each holder of any Note by its 
         acceptance  thereof agrees to be bound by the provisions
         of this Note.  The Section headings herein are for convenience only
         and shall not affect the construction hereof.



<PAGE>




                  IN WITNESS  WHEREOF,  the Issuer has caused this  instrument
to be duly executed as of this ____ day of  ___________, 1999.


                         UNILAB CORPORATION


                         By:      _____________________________________
                         Name:
                        Title:

                                    18448 Oxnard Street
                                    Tarzana, CA 91356


<PAGE>



                                   SCHEDULE A


Principal Amount of Note Paid                                     Date



                                TABLE OF CONTENTS


                                                                  PAGE

                          ARTICLE 1 REGISTRATION RIGHTS


SECTION1.01.  Definitions...........................................1
SECTION1.02.  Demand Registration...................................2
SECTION1.03.  Piggyback Registration................................4
SECTION1.04.  Obligations of the Company and the Holders............5
SECTION1.05.  Furnishing of Information.............................8
SECTION1.06.  Expenses of Registration..............................8
SECTION1.07.  Indemnification.......................................8
SECTION1.08.  Reports under 1934 Act...............................12
SECTION1.09.  Lock-up Agreements...................................13
SECTION1.10.  Effect of Transfer of Registrable Securities.........13
SECTION1.11.  Limitations on Subsequent Registration Rights........13
SECTION1.12.  Termination..........................................13

                             ARTICLE 2 MISCELLANEOUS


SECTION2.01.  Legend...............................................14
SECTION2.02.  Notices..............................................14
SECTION2.03.  Entire Agreement.....................................15
SECTION2.04.  Amendments, Waivers and Consents.....................15
SECTION2.05.  Binding Effect; Assignment...........................16
SECTION2.06.  General..............................................16
SECTION2.07.  Severability.........................................16
SECTION2.08.  Counterparts.........................................16
SECTION2.09.  Specific Performance.................................16



<PAGE>




                               UNILAB CORPORATION
                          REGISTRATION RIGHTS AGREEMENT

         This  REGISTRATION  RIGHTS  AGREEMENT   ("Agreement")  is  made  as  of
__________,  1999  between  UNILAB  CORPORATION,  a  Delaware  corporation  (the
"Company")  and  PHYSICIANS  CLINICAL   LABORATORIES,   INC.,  d/b/a  BIO-CYPHER
LABORATORIES, a Delaware corporation ("Investor").

         WHEREAS,  the Company and Investor have entered into an Asset  Purchase
Agreement dated as of __________,  1999 ("Asset Purchase Agreement") pursuant to
which the Company has agreed,  under the terms and conditions set forth therein,
to  issue  to  Investor   1,000,000  shares  of  common  stock  of  the  Company
("Consideration Shares") and a Convertible Note of the Company (the "Note") that
at the  Company's  option may be payable by the Company in a number of shares of
common stock  ("Conversion  Shares" and together with the Consideration  Shares,
the "Common Stock") as set forth in the Note;

         WHEREAS,  it is a condition  to the  consummation  of the  transactions
contemplated by the Asset Purchase Agreement that the Company and Investor enter
into this Agreement;

         NOW,  THEREFORE,  in  consideration  of the foregoing  recitals and the
mutual covenants and agreements  herein  contained,  the parties hereto agree as
follows:



                                    ARTICLE 1

                               REGISTRATION RIGHTS

         SECTION 1.1.  Definitions.  For the purposes of this Agreement:

          (a) The terms "register," and "registered," and  "registration"  refer
to a registration  effected by preparing and filing with the U.S. Securities and
Exchange  Commission  ("SEC") a  registration  statement or similar  document in
compliance with the Securities Act of 1933, as amended, and the applicable rules
and regulations thereunder ("1933 Act"), and the automatic  effectiveness or the
declaration  or  ordering  by the  SEC of  effectiveness  of  such  registration
statement or document;



<PAGE>



          (b) The term "Registrable  Securities" means the Consideration Shares,
the  Conversion  Shares and any common stock of the Company or any  successor in
interest  of the  Company  whether  by  sale,  merger,  by  operation  of law or
otherwise issued as (or issuable upon the conversion or exercise of any warrant,
option,  right or  other  security  which  is  issued  as) a  dividend  or other
distribution  with  respect to, or in  exchange  for or in  replacement  of, the
Common  Stock;  provided,  however,  that (i) any shares of common  stock of the
Company sold to the general public  pursuant to a registered  public offering or
pursuant to an  exemption  from the  registration  requirements  of the 1933 Act
shall cease to be  Registrable  Securities  from and after the time of such sale
and (ii) any shares of common  stock of the  Company,  when  eligible for resale
pursuant to Rule 144(k) shall cease to be Registrable Securities;

          (c)  The  term  "Holder"  means  any  Person  owning  any  Registrable
Securities on the date hereof and any holder of  Registrable  Securities to whom
the rights  conferred by this Agreement have been transferred in compliance with
Section 1.10 of this Agreement;

          (d) The  term  "Person"  means  an  individual,  corporation,  limited
liability  company,   partnership,   association,   trust  or  other  entity  or
organization,  including a government or political  subdivision  or an agency or
instrumentality thereof; and

          (e) The  terms  "Form  S-3,"  "Form  S-4" and  "Form  S-8"  mean  such
respective  forms  under  the 1933 Act as in  effect  on the date  hereof or any
successor  registration forms to Form S-3, Form S-4 and Form S-8,  respectively,
under the 1933 Act subsequently adopted by the SEC.

         SECTION 1.2. Demand Registration. (a) Beginning 180 days after the date
hereof,  if the Company shall receive at any time a written  request  ("Demand")
from  Holders  holding  in the  aggregate  in excess  of 50% of the  Registrable
Securities then outstanding  that the Company effect the  registration  covering
the sale of Registrable  Securities then  outstanding with a market value on the
date of such Demand of at least  $5,000,000  (the Holders  making a Demand being
referred to as the "Initiating  Holders"),  then the Company shall,  within five
days of the receipt thereof,  give written notice of such request to all Holders
and shall, subject to the limitations of this Section 1.02, use its best efforts
to effect such a registration  as soon as  practicable  and in any event to file
within 120 days of the receipt of such Demand a registration statement under the
1933 Act covering all the Registrable  Securities  which the Initiating  Holders
shall have  requested,  and all Registrable  Securities  which the Holders other
than the Initiating  Holders shall in writing  request within 20 days of receipt
of the notice given by the Company to be included in such registration,  and use
its best efforts to have such registration statement become effective as soon as
practicable;  provided,  however,  that the Company shall not be obligated under
this Section  1.02(a) to effect any  registration  (i) pursuant to a Demand with
respect to an amount of Registrable  Securities  with a market value on the date
of such Demand of less than $5,000,000, or (ii) after the number of registration
statements  pursuant to a Demand as  specified  in Section  1.02(c)  have become
effective.



<PAGE>


          (b) If the Initiating  Holders  intend to distribute  the  Registrable
Securities  covered by their request by means of an underwriting,  they shall so
advise the Company as part of their request made pursuant to paragraph  (a), and
the Company shall include such  information in the written notice given pursuant
to  paragraph  (a).  In such  event,  the  right of any  Holder to  include  its
Registrable  Securities  in such  registration  shall be  conditioned  upon such
Holder's  participation in such  underwriting and the inclusion of such Holder's
Registrable  Securities in the underwriting (unless otherwise mutually agreed by
a majority in interest of the Initiating  Holders and such Holder) to the extent
provided herein.  All Holders  proposing to distribute their securities  through
such  underwriting  shall  (together  with the  Company as  provided  in Section
1.04(e))  enter into an  underwriting  agreement in a form that is customary and
otherwise  reasonably  acceptable to the Initiating Holders and the Company with
the underwriter or underwriters  selected for such underwriting by a majority in
interest of the Initiating Holders,  who shall first consult with and obtain the
consent of the  Company's  Board of Directors  (which shall not be  unreasonably
withheld)   regarding  the  selection  of  an   underwriter   or   underwriters.
Notwithstanding  any other  provision of this Section 1.02, if, in the case of a
registration  requested  pursuant to  paragraph  (a) of this Section  1.02,  the
underwriter  advises the  Initiating  Holders  and the  Company in writing  that
marketing   factors  require  a  limitation  of  the  number  of  shares  to  be
underwritten,  then the  Company  shall so advise  all  Holders  of  Registrable
Securities  that  would  otherwise  be  underwritten  pursuant  hereto,  and the
majority in interest thereof may choose (i) to instruct the Company to terminate
the  registration or (ii) to have the number of Registrable  Securities that may
be included in the  underwriting be allocated pro rata among all Holders thereof
(including the Initiating  Holders) desiring to participate in such underwriting
(according to the number of Registrable  Securities requested to be sold by each
Holder).  No  Registrable  Securities  requested by a Holder to be included in a
registration  pursuant to paragraph (a) shall be excluded from the  underwriting
unless all securities other than Registrable Securities are first excluded.

          (c) The Company  shall not be obligated to effect more than (i) if the
Company has issued to the holders of the Notes  300,000 or more shares of Common
Stock in respect of amounts  payable under the Notes,  three, or (ii) otherwise,
two, registrations  pursuant to Demands under clause Section 1.02(a);  provided,
that  no  registration  of  Registrable  Securities  shall  be  deemed  to  be a
registration  for the purpose of  paragraphs  (a) and (c) of this  Section  1.02
unless such registration  shall have become and remained effective in accordance
with  Section  1.04  and  not  been  terminated  pursuant  to  Section  1.02(b).
Notwithstanding the foregoing, the Company shall not be obligated to effect more
than two registration pursuant to a Demand in a 12 month period.



<PAGE>


          (d)  Notwithstanding  the other  provisions of this Section 1.02,  the
Company shall not be obligated to effect the filing of a registration  statement
pursuant to this Section 1.02: (i) during the period  starting on the date which
is 15 days prior to the date which the Company  estimates  in good faith will be
the date of filing of, and ending on the date 180 days, or such lesser period as
the  managing  underwriters  will permit,  following  the  effective  date of, a
registration   statement  pertaining  to  an  underwritten  public  offering  of
securities for the account of the Company; provided that the Company is actively
employing  in good  faith all  reasonable  efforts  to cause  such  registration
statement  to become  effective  and is  responding  in writing to any  Holder's
reasonable  inquiries with respect thereto to the extent  permitted by law; (ii)
if the Company has  furnished  to the  Initiating  Holders  within 30 days after
receipt of their Demand pursuant to Section 1.02(a) an opinion of counsel to the
Company (which counsel and opinion are reasonably satisfactory to the Initiating
Holders)  to the effect that the  Initiating  Holders may effect the public sale
and distribution of the Registrable Securities included in their request without
the registration of such securities under the 1933 Act within 90 days or 60 days
if registration on Form S-3 is available, and that the certificates representing
such Registrable  Securities need not bear any restrictive  legend;  or (iii) if
the Company has furnished to the Initiating Holders within 30 days after receipt
of their Demand pursuant to Section 1.02(a) a certificate signed by an executive
officer of the Company  stating that in the good faith  judgment of the Board of
Directors of the Company,  it would be seriously  detrimental to the Company and
its  stockholders  for  the  requested  registration  to  be  effected  or  such
registration  would require  premature  disclosure of material  information or a
special audit of the Company, in which event the Company shall have the right to
defer such  registration for a period of not more than 100 days after receipt of
the Demand of the Initiating Holders; and provided further, (a) that the Company
shall not defer its  obligations  in this  manner  more than twice in any twelve
month period and (b) a stock price  depression  of 20% or less in the  Company's
Common  Stock  resulting  solely  from  the  proposed  offering  by the  Holders
(determined  as of  the  date  of  receipt  of the  Demand  in  the  good  faith
determination  of the Board of Directors in  consultation  with its  independent
financial advisors,  if any) shall be deemed not to be seriously  detrimental to
the Company and its stockholders for the purpose of this Section 1.02(d).

          (e) A  registration  requested  pursuant  to  paragraph  (a)  shall be
effected by the filing of a registration  statement on Form S-3 (or if such form
is not  available,  such form as the Company and its counsel  deem  appropriate,
consistent  with SEC  rules  to  effect a  public  offering  of the  Registrable
Securities subject to the Demand.)

          (f) The  Company  shall be  entitled to rely upon and assume the truth
and accuracy of the  statements  contained  in a Demand,  unless the Company has
actual  knowledge  that any such  statement  is untrue or unless the  Company is
otherwise notified in writing by a party to this Agreement.



<PAGE>


         SECTION 1.3.  Piggyback  Registration.  (a) If the Company  proposes to
register (including for this purpose a registration  effected by the Company for
stockholders  other than the  Holders)  any of its common  stock or other equity
securities (including any securities convertible into or exchangeable for equity
securities)  under the 1933 Act in connection  with the public  offering of such
securities (other than a registration on Form S-8 or any successor form relating
solely to the sale of securities to  participants  in a Company stock plan, or a
registration  on Form S-4 or any successor  form),  the Company  shall,  at such
time, promptly give each Holder written notice of such registration. The Company
shall request that any Holder that wants the registration statement to cover the
sale of any or all of the  Registrable  Securities  owned by such  Holder,  give
notice  within  20 days  after  the  receipt  by such  Holder  of the  notice of
registration by the Company which notice shall specify the amount of Registrable
Securities  the holder  wants to  register.  The Company  shall,  subject to the
provisions  of  paragraph  (b),  use its best  efforts  to cause a  registration
statement covering the sale of all of the Registrable  Securities that each such
Holder has  requested  to be  registered  within  such  20-day  period to become
effective  under the 1933 Act. The Company shall have no  obligation  under this
Section  1.03  to  make  any  offering  of its  securities  or to  complete  any
registration  or any offering of its  securities  that it proposes to make,  and
shall incur no  liability  to any Holder for its  failure to do so. If,  after a
request by the  Company  pursuant  to this  Section  1.03(a),  a Holder does not
request that the registration  statement cover its Registrable Securities within
such  20-day  period,  such  Holder  waives its  piggyback  registration  rights
pursuant to Section 1.03 of this Agreement with respect to such registration.

          (b) In  connection  with any  offering  involving an  underwriting  of
securities being issued by the Company,  the Company shall not be required under
this Section 1.03 to include any Holder's securities in such underwriting unless
such Holder  accepts the terms of the  underwriting  as agreed upon  between the
Company and the underwriters  selected by it, and then only in such quantity, if
any, as will not, in the reasonable opinion of the underwriters,  jeopardize the
success of the offering by the  Company.  If the  managing  underwriter  for the
offering  shall advise the Company in writing that marketing  factors  require a
limitation  of the amount of  securities  to be  underwritten,  then the Company
shall so advise all Holders of Registrable  Securities  which would otherwise be
underwritten   pursuant  this  Section  1.03,  and  the  amount  of  Registrable
Securities  that may be  included  in the  underwriting  shall be  allocated  in
accordance with paragraph (c).

          (c) If the Company shall, pursuant to paragraph (b), reduce the amount
of securities  to be included in an offering,  such  reduction  shall be made as
follows:  First,  all securities  other than those to be included by the Company
for its own account or  pursuant to that  Registration  Rights  Agreement  dated
November 5, 1998, by and among Unilab Corporation and Meris  Laboratories,  Inc.
or those  sought  to be  included  by the  Holders  shall be  excluded  from the
offering to the extent any  limitation on the amount of  securities  included in
the  underwriting  is required;  then,  if further  limitation  on the amount of
securities  to be  included  in the  underwriting  is  required,  the  amount of
Registrable  Securities held by Holders that may be included in the underwriting
shall be reduced  pro rata among the  selling  Holders  in  accordance  with the
amount of Registrable Securities requested to be sold by each such Holder.

         SECTION  1.4.  Obligations  of the  Company and the  Holders.  Whenever
required under this Article 1 to use its best efforts to effect the registration
of any Registrable Securities, the Company shall:



<PAGE>


          (a) Use its best  efforts to prepare  and file as soon as  practicable
with  the  SEC  a  registration  statement  with  respect  to  such  Registrable
Securities  and use its best  efforts to cause such  registration  statement  to
become effective as soon as practicable and, upon the request of Holders holding
a  majority  of the  Registrable  Securities  registered  thereunder,  keep such
registration  statement effective for a period of 135 days or until such Holders
have informed the Company in writing that the  distribution of their  securities
has been  completed,  whichever  first occurs;  provided,  a shelf  registration
statement  may be kept  effective  for a period longer than 135 days upon mutual
agreement between the Company and Holders.

          (b) Prepare and file with the SEC such  amendments and  supplements to
such  registration  statement and the  prospectus  used in connection  with such
registration statement, and use its best efforts to cause each such amendment to
become effective as soon as practicable,  as may be necessary to comply with the
provisions  of the 1933 Act with respect to the  disposition  of all  securities
covered by such registration statement;

          (c) Furnish to the selling Holders such reasonable number of copies of
a  prospectus,   including  a  preliminary  prospectus  and  any  amendments  or
supplements  thereto,  in conformity with the  requirements of the 1933 Act, and
such other  documents as they may reasonably  request in order to facilitate the
disposition of the Registrable Securities covered by such registration statement
that are owned by them;

          (d) Use its best efforts to register or qualify the securities covered
by such  registration  statement under such other securities or Blue Sky laws of
such states and  jurisdictions as shall be reasonably  requested by the Holders,
provided that the Company shall not be required in connection  therewith or as a
condition  thereto  to qualify to do  business  or to file a general  consent to
service of process in any such state or jurisdiction;

          (e) In the event of any underwritten  public offering,  enter into and
perform its obligations under an underwriting  agreement, in usual and customary
form, with the managing underwriter of such offering;  provided,  further,  that
each Holder participating in such underwriting shall also enter into and perform
its  obligations  under such an agreement,  including  furnishing any opinion of
counsel  or  entering  into a  lock-up  agreement  reasonably  requested  by the
managing underwriter;

          (f)  Notify  each  Holder of  Registrable  Securities  covered by such
registration  statement,  at any time when a prospectus relating thereto covered
by such  registration  statement is required to be delivered under the 1933 Act,
of the  happening of any event as a result of which the  prospectus  included in
such registration  statement, as then in effect, includes an untrue statement of
a material fact or omits to state a material fact required to be stated  therein
or necessary to make the  statements  therein not misleading in the light of the
circumstances then existing, promptly file such amendments and supplements which
may be required  pursuant to paragraph (b) on account of such event, and use its
best efforts to cause each such amendment and supplement to become effective;



<PAGE>


          (g) Furnish,  at the request of any Holder of  Registrable  Securities
covered  by such  registration  statement,  on the date  that  such  Registrable
Securities  are  delivered to the  underwriters  for sale in  connection  with a
registration,  if such  securities are being sold through  underwriters,  or, if
such  securities are not being sold through  underwriters,  on the date that the
registration statement with respect to such securities becomes effective, (i) an
opinion or opinions,  dated such date, of the counsel  representing  the Company
for the purposes of such  registration,  in form and substance as is customarily
given by company counsel to the underwriters in an underwritten public offering,
addressed  to the  underwriters,  if  any,  and to the  Holders  of  Registrable
Securities  covered by such registration  statement and (ii) a letter dated such
date, from the independent  certified public accountant of the Company,  in form
and  substance  as  is  customarily   given  by  independent   certified  public
accountants to underwriters in an underwritten public offering, addressed to the
underwriters,  if any, and to the Holders of Registrable  Securities  covered by
such registration statement;

          (h) Apply for listing and use its best efforts to list the Registrable
Securities being registered on any national securities exchange on which a class
of the Company's equity  securities is listed or, if the Company does not have a
class of equity  securities  listed on a national  securities  exchange,  to the
extent  that  the  securities  of  the  Company  would  so  qualify,  apply  for
qualification  and use its best  efforts to qualify the  Registrable  Securities
being registered for inclusion on the automated quotation system of the National
Association of Securities Dealers, Inc.;

          (i) Without in any way  limiting the types of  registrations  to which
this  Article  1 shall  apply,  in the event  that the  Company  shall  effect a
registration  under  Rule 415  under the 1933 Act,  take all  necessary  action,
including without limitation the filing of post-effective  amendments, to permit
the Holders to include  their  Registrable  Securities in such  registration  in
accordance with the terms of this Article 1; and

          (j) Each  Holder  agrees  that,  upon  receipt of any notice  from the
Company of the happening of any event of the kind  described in Section  1.04(f)
hereof,  such Holder  will  forthwith  discontinue  disposition  of  Registrable
Securities  pursuant to the  registration  statement  covering such  Registrable
Securities  until such  Holder's  receipt of the copies of the  supplemented  or
amended prospectus  contemplated by Section 1.04(f) hereof,  and, if so directed
by the Company,  such Holder will deliver to the Company all copies,  other than
any permanent file copies then in such Holder's  possession,  of the most recent
prospectus  covering such Registrable  Securities at the time of receipt of such
notice. In the event that the Company shall give such notice,  the Company shall
extend the period during which such  registration  statement shall be maintained
effective  (including the period  referred to in Section  1.04(a) hereof) by the
number of days  during the period from and  including  the date of the giving of
notice  pursuant to Section  1.04(f)  hereof to the date when the Company  shall
deliver  to such  Holder or any  underwriter  engaged  in  connection  with such
transaction   a  prospectus   supplemented   or  amended  to  conform  with  the
requirements of the 1933 Act and Section 1.04(f) hereof.



<PAGE>


         SECTION  1.5.  Furnishing  of  Information.   The  following  shall  be
conditions  precedent  to the  obligations  of the  Company  to take any  action
pursuant  to this  Article 1 in respect  of the  Registrable  Securities  of any
selling Holder that such selling Holder shall have: (i) furnished to the Company
such information as the Company shall reasonably  request regarding such selling
Holder, the Registrable Securities held by such selling Holder, and the intended
method of  disposition  of such  securities  as shall be  required to effect the
registration of such selling Holder's Registrable Securities,  and (ii) provided
the Company with such representations and warranties,  covenants and opinions as
are customary for a selling stockholder in connection with the registration of a
selling stockholder's securities.

         SECTION 1.6.  Expenses of Registration.  (a) The Company shall bear the
expenses incurred in connection with the registration,  filing or qualification,
including  all  registration,   filing  and  qualification  fees,  printing  and
accounting  fees,  the  reasonable  fees and  disbursements  of counsel  for the
Company; provided that if a registration has been terminated pursuant to Section
1.02(b),  the Holders that have requested to include any Registrable  Securities
in such  registration  shall  reimburse  the  Company  for all of the  Company's
out-of-pocket  expenses described in this first sentence of Section 1.06(a) with
respect to such registration; provided further that in addition to the Company's
other  rights,  for so  long  as the  Company  has not  been  reimbursed  for an
aggregate  amount  greater  than  $25,000,  the Holders  shall be deemed to have
exercised a Demand. The Holders of any Registrable Securities shall bear and pay
the fees and  disbursements  of counsel  or other  advisors,  including  without
limitation accountants and financial advisors, for the selling Holders.

          (b) Underwriting discounts and commissions relating to the Registrable
Securities included in a registration  pursuant to this Article 1 shall be borne
and paid  ratably  by the  Holders of such  Registrable  Securities  and,  if it
participates, by the Company.

         SECTION  1.7.  Indemnification.   In  the event  that any Registrable
Securities  are  included  in  a registration statement under this Article 1:



<PAGE>


          (a) The  Company  shall  indemnify  and hold  harmless  each holder of
Registrable  Securities included in such registration  ("Selling  Holder"),  the
officers, directors,  partners, agents and employees of each Selling Holder, any
underwriter  (as  defined  in the 1933  Act) for the  Selling  Holders  and each
person,  if any,  who  controls  (within  the  meaning  of the  1933  Act or the
Securities  Exchange  Act of 1934,  as  amended  and the  applicable  rules  and
regulations thereunder ("1934 Act")) a Selling Holder or underwriter against any
losses, claims, damages, or liabilities (joint or several) which they may suffer
or  become  subject  to for  violation  of the 1933  Act,  the 1934 Act or other
federal or state law,  and any legal or other  expenses  reasonably  incurred by
them in connection with investigating or defending any such loss, claim, damage,
or liability (or action with respect  thereto)  insofar as such losses,  claims,
damages,  liabilities  or  actions  arise  out of or are  based  upon any of the
following  statements,  omissions or violations (a "Violation"):  (i) any untrue
statement of a material fact contained in such registration statement, including
any preliminary prospectus or final prospectus contained therein or deemed to be
part thereof under the 1933 Act or any amendments or supplements  thereto,  (ii)
the omission to state in such registration statement a material fact required to
be stated therein or necessary to make the statements  therein,  in light of the
circumstances  in which they were made, not  misleading,  (iii) any violation by
the Company of the 1933 Act, the 1934 Act, any state  securities law or any rule
or  regulation  promulgated  under  the 1933  Act,  the  1934  Act or any  state
securities  law in  connection  with any matter  relating  to such  registration
statement  or (iv) any breach of this  Agreement;  provided,  however,  that the
Company  shall not be liable  under  this  paragraph:  (i) for  amounts  paid in
settlement of any loss, claim, damage,  liability,  or action if such settlement
is  effected  without the consent of the  Company  (which  consent  shall not be
unreasonably  withheld);  or (ii) for any loss,  claim,  damage,  liability,  or
action  (A) to the extent  that it arises  out of or is based  upon a  Violation
which  occurs  in  reliance  upon and in  conformity  with  written  information
furnished expressly for use in connection with such registration by or on behalf
of such  Holder  (including  statements  contained  in a Demand as  provided  in
Section 1.02(e) that have not been  subsequently  corrected in written notice to
the Company from such Holder in a timely manner prior to the sale giving rise to
such violation), underwriter or controlling person of a Selling Holder or (B) in
the  case of a sale  directly  by a  Selling  Holder  (including  a sale of such
Registrable  Securities through any underwriter  retained by such Selling Holder
to engage in a  distribution  solely on behalf of such Selling  Holder),  to the
extent  that it arises  out of or is based on an  untrue  statement  or  alleged
untrue  statement  or  omission  or alleged  omission  that was  contained  in a
preliminary prospectus and corrected in a final or amended prospectus,  and such
Selling Holder failed to deliver a copy of the final or amended prospectus at or
prior to the  confirmation  of the  sale of the  Registrable  Securities  to the
person  asserting  any such loss,  claim,  damage or liability in any case where
such delivery is required by the Securities Act if the Company has provided such
final or amended  prospectus to such Selling  Holder in a timely manner prior to
such sale.



<PAGE>


          (b)  The  Company  may  require,  as  a  condition  to  including  the
Registrable  Securities held by any Selling Holder in any registration statement
pursuant to this Section 1, that the Company shall have received an  undertaking
from such  Selling  Holder,  on a several  but not joint and several  basis,  to
indemnify  and hold  harmless the Company,  each of its  directors,  each of its
officers who signs the registration statement, each Person, if any, who controls
the Company  within the meaning of the 1933 Act or the 1934 Act,  each agent and
any underwriter for the Company, any other Person selling securities included in
such registration  statement,  any Person who controls such underwriter or other
Person and each of their respective  directors,  officers,  partners,  agents or
employees  (collectively  the "Company  Parties"),  against any losses,  claims,
damages, or liabilities (joint or several) to which any Company Party may become
subject, under the 1933 Act, the 1934 Act or other federal or state law, and any
legal or other expenses  reasonably  incurred by the Company Party in connection
with  investigating or defending any such loss, claim,  damage, or liability (or
action  with  respect  thereto),   insofar  as  such  losses,  claims,  damages,
liabilities  or actions  arise out of or are based upon any  Violation,  in each
case to the extent (and only to the extent) that such Violation  occurs,  (i) in
reliance  upon and in  conformity  with written  information  furnished by or on
behalf of such Holder expressly for use in connection with such  registration or
(ii) as a result of any breach of this  Agreement  by such Holder in  connection
with any  offering of  Registrable  Securities  by such Holder  pursuant to such
registration  statement;  provided,  however,  that no Holder  shall be required
under this  paragraph to incur any  liability (i) in excess of the amount of net
proceeds  (after  deduction  of all  underwriters'  discounts  and  commissions)
received by such Holder in the offering  giving rise to the Violation;  (ii) for
any amounts paid in settlement  of any such loss,  claim,  damage,  liability or
action if such settlement is effected  without the consent of such Holder (which
consent  shall  not be  unreasonably  withheld);  or (iii) in the case of a sale
directly by the Company of its securities  (including a sale of such  securities
through any  underwriter  retained  by the  Company to engage in a  distribution
solely on behalf of the Company),  in any case in which such untrue statement or
omission was  contained in a  preliminary  prospectus  or final  prospectus  and
corrected in a final or amended prospectus,  and the Company failed to deliver a
copy of the final or amended  prospectus at or prior to the  confirmation of the
sale of the securities to the person asserting any such loss,  claim,  damage or
liability in any case where such delivery is required by the 1933 Act.

          (c) Promptly  after receipt by an  indemnified  party pursuant to this
Section  1.07  of  notice  of the  commencement  of any  action  (including  any
governmental  action),  such  indemnified  party  shall,  if a claim in  respect
thereof is to be made against any  indemnifying  party under this Section  1.07,
deliver to the  indemnifying  party a written notice of the commencement of such
action and the  indemnifying  party shall have the right to participate in, and,
to the  extent  the  indemnifying  party so  desires,  jointly  with  any  other
indemnifying party similarly noticed,  to assume and control the defense thereof
with counsel mutually satisfactory to the parties;  provided,  however, that the
indemnified  parties shall have the right to retain a separate firm of attorneys
to serve as their  own  counsel,  with the fees and  expenses  to be paid by the
indemnifying  party, if representation of the indemnified parties by the counsel
retained  by the  indemnifying  party  would be  inappropriate  due to actual or
potential differing interests, as reasonably determined by either party, between
any such indemnified  parties and any other party represented by such counsel in
such  proceeding.  It is understood  that the  indemnifying  party shall not, in
connection with any proceeding or related  proceedings in the same jurisdiction,
be liable for the reasonable fees and expenses of more than one separate firm of
attorneys at any time for the  indemnified  parties.  The failure to deliver the
written notice required by this paragraph (c) to the indemnifying party within a
reasonable time of the  commencement  of any such action,  if prejudicial to its
ability to defend such  action,  shall  relieve such  indemnifying  party of any
liability to the indemnified party under this Section 1.07 to the extent of such
prejudice,  but the omission so to deliver  written  notice to the  indemnifying
party will not relieve it of any liability  that it may have to any  indemnified
party otherwise than under this Section 1.07.

          (d) The  obligations of the Company and the Holders under this Section
1.07 shall survive the  conversion,  if any, of the Notes and the  completion of
any offering of  Registrable  Securities in a  registration  statement,  whether
under this Section 1 or otherwise.



<PAGE>


          (e) If the  indemnification  provided  for in  this  Section  1.07  is
unavailable  to a party  that would have been an  indemnified  party  under this
Section  1.07 in respect of any  losses,  claims,  damages  or  liabilities  (or
actions or proceedings with respect thereto) referred to herein, then each party
that  would  have  been  an  indemnifying  party  thereunder  shall,  in lieu of
indemnifying such indemnified party, contribute to the amount paid or payable by
such  indemnified  party  as  a  result  of  such  losses,  claims,  damages  or
liabilities  (or actions or proceedings  in respect  thereof) (i) as between the
Company on one hand and the Selling  Holders on the other in such  proportion as
is  appropriate to reflect the relative  benefits  received from the offering of
the Selling Holders'  Registrable  Securities and any securities offered for the
benefit of the Company pursuant to such registration  statement, or (ii) if such
allocation  is not  permitted  by  applicable  law,  in  such  proportion  as is
appropriate  to reflect not only the  relative  benefits  but also the  relative
fault of such  indemnifying  party on the one hand and such indemnified party on
the other in connection  with the statements or omissions which resulted in such
losses,  claims,  damages or  liabilities  (or actions or proceedings in respect
thereof).  The relative fault of the Company on one hand or the Selling  Holders
on the other hand shall be determined  by reference to, among other things,  the
relative benefits  received by the indemnifying  party and the indemnified party
from such offering, whether the Violation relates to information supplied by the
Company on one hand and the Selling  Holders on the other hand and the  parties'
relative intent, knowledge,  access to information and opportunity to correct or
prevent  such  Violation.  The  parties  agree  that it  would  not be just  and
equitable if contribution  pursuant to this paragraph (e) were determined by pro
rata allocation or by any other method of allocation which does not take account
of the  equitable  considerations  referred to in the  preceding  sentence.  The
amount  paid or  payable  by a  contributing  party as a result  of the  losses,
claims,  damages or liabilities  (or actions or proceedings in respect  thereof)
referred  to  above in this  paragraph  (e)  shall  include  any  legal or other
expenses  reasonably  incurred  by such  indemnified  party in  connection  with
investigating  or  defending  any such  action  or claim.  No  person  guilty of
fraudulent  misrepresentation  (within the meaning of Section  11(f) of the 1933
Act) shall be  entitled  to  contribution  from any person who was not guilty of
such  fraudulent  misrepresentation.  The  liability  of any  Selling  Holder in
respect of any  contribution  obligation of such Selling Holder (after deduction
of all  underwriters'  discounts and  commissions and all other expenses paid by
such Selling Holder in connection  with the  registration  in question)  arising
under this  paragraph  (e) shall not in any event  exceed an amount equal to the
net  proceeds to such Selling  Holder from the  disposition  of the  Registrable
Securities disposed of by such Selling Holder pursuant to such registration.



<PAGE>


         SECTION 1.8.  Reports under 1934 Act.

          (a)  Resales  Under Rule 144;  Form S-3  Registration.  With a view to
making  available  to the  Holders  the  benefits of Rule 144 under the 1933 Act
("Rule  144") and any other rule or  regulation  of the SEC that may at any time
permit  a  Holder  to sell  securities  of the  Company  to the  public  without
registration,  and with a view to making it possible for Holders to register the
Registrable  Securities  pursuant  to a  registration  on Form S-3,  the Company
agrees to:

                  (i) use its best  efforts to make and keep public  information
         available, as those terms are understood as defined in Rule 144;

                 (ii) take such action,  including the voluntary registration of
         the Common  Stock under  Section 12 of the 1934 Act, as is necessary to
         enable  the  Holders  to  utilize  Form  S-3  for  the  sale  of  their
         Registrable Securities;

                (iii)  use its  best  efforts  to file  with the SEC in a timely
         manner all reports and other  documents  required of the Company  under
         the 1933 Act and the 1934 Act; and

                 (iv)  furnish to any  Holder,  so long as the  Holder  owns any
         Registrable Securities,  forthwith upon request (A) a written statement
         by the Company as to its compliance with the reporting  requirements of
         Rule  144,  the 1933  Act and the  1934  Act (at any time  after it has
         become  subject  to  such  reporting   requirements),   or  as  to  its
         qualification  as a registrant  whose securities may be resold pursuant
         to Form S-3 (at any time after it so qualifies), (B) a copy of the most
         recent annual or quarterly report of the Company and such other reports
         and documents so filed by the Company,  and (C) such other  information
         as may be  reasonably  requested  in  availing  any Holder of any rule,
         regulation  or form of the SEC which  permits  the  selling of any such
         securities without registration or pursuant to such form.

          (b) Resale  Under Rule 144A.  At all times during which the Company is
neither  subject to the  reporting  requirements  of Sections 13 or 15(d) of the
1934 Act nor exempt from  reporting  pursuant to Rule  12g3-2(b)  under the 1934
Act, the Company shall, upon the written request of a Holder, provide in written
form to such Holder and to any prospective  purchaser of Registrable  Securities
designated by such Holder, all information  required by Rule 144A(d)(4)(i) under
the 1933 Act ("144A  Information").  With respect to each Holder,  the Company's
obligations  under this paragraph (b) shall at all times be contingent upon such
Holder's  obtaining  from a  prospective  purchaser  an  agreement  to take  all
reasonable  precautions  to safeguard the 144A  Information  from  disclosure to
anyone  other  than  employees,  agents of  representatives  of the  prospective
purchaser  who require  access to the 144A  Information  for the sole purpose of
evaluating its purchase of the Company's securities.


<PAGE>



         SECTION  1.9.  Lock-up  Agreements.  If  reasonably  requested  by  the
managing  underwriter,  the Holders shall enter into lock-up agreements pursuant
to which they agree,  for a period of up to 90 days following the effective date
of a  registration  statement for the public  offering of the  Company's  common
stock or securities exchangeable or convertible into common stock, not to offer,
sell or otherwise  dispose of any Registrable  Securities except the Registrable
Securities  sold  pursuant  to such  registration  statement  without  the prior
consent of the managing underwriter.

         SECTION  1.10.  Effect  of  Transfer  of  Registrable  Securities.  The
transfer by a Holder of any of such Holder's Registrable Securities or rights to
acquire  Registrable  Securities  shall,  unless  such  securities  cease  to be
Registrable  Securities by reason of such transfer,  constitute an assignment to
such transferee of the Holder's rights under this Agreement with respect to such
Registrable  Securities;  provided,  however,  that no Holder party hereto other
than the Investor shall enjoy any rights as a Holder under this Agreement  until
such time as (i) such Holder and its affiliates holds,  after such transfer,  at
least 25% of the Registrable  Securities  outstanding as of the date hereof, and
(ii) such  Holder  delivers to the  Company a written  instrument  by which such
Holder agrees to be bound by the  obligations and  representations  imposed upon
Holders  under this  agreement to the same extent as if such Holder were a party
hereto.

         SECTION 1.11.  Limitations on Subsequent  Registration Rights. From and
after the date of this  Agreement,  the  Company  shall not,  without  the prior
written consent of the Holders holding a majority of the Registrable  Securities
then outstanding, enter into any agreement with any holder or prospective holder
of any  securities of the Company  relating to  registration  rights unless such
agreement  provides  that,  to the extent that such  agreement  would allow such
holder or  prospective  holder to include such  securities  in any  registration
filed under this Section 1, a provision that such holder or  prospective  holder
may include such securities in any such registration only to the extent that the
inclusion  of its  securities  will not  reduce  the  amount of the  Registrable
Securities of the Holders which would otherwise be included.

         SECTION 1.12.  Termination.  This Agreement,  and the respective rights
and obligations of the parties hereto, shall terminate at such time as there are
no longer any Registrable Securities outstanding or issuable upon the conversion
or exercise of any  outstanding  securities of the Company;  provided,  however,
that the  provisions  of Section 1.07 shall not terminate at that time and shall
remain in force.





<PAGE>


                                    ARTICLE 2

                                  MISCELLANEOUS

         SECTION 2.1.  Legend.  Each certificate representing Registrable
Securities shall state thereon:

        THESE  SHARES  OF THE  ISSUER'S  COMMON  STOCK  HAVE  NOT BEEN
        REGISTERED  UNDER THE  SECURITIES ACT OF 1933, AS AMENDED (THE
        "SECURITIES  ACT"), OR ANY STATE SECURITIES LAWS. THESE SHARES
        HAVE BEEN  ACQUIRED FOR THE ACCOUNT OF THE HOLDER AND NOT WITH
        A VIEW  TOWARDS,  OR FOR  RESALE IN  CONNECTION  WITH A PUBLIC
        OFFERING AND MAY NOT BE OFFERED FOR SALE, SOLD, TRANSFERRED OR
        ASSIGNED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
        UNDER THE SECURITIES ACT OR APPLICABLE  STATE SECURITIES LAWS,
        OR AN EXEMPTION FROM SUCH REGISTRATION OR UNLESS SOLD PURSUANT
        TO RULE 144 UNDER THE SECURITIES ACT.

or shall bear a similar  legend  indicating  the existence of this Agreement and
the restrictions imposed thereby.

         Such  legend   shall  be  removed  once  the  shares  of  Common  Stock
represented  by any such  certificate  shall no  longer  constitute  Registrable
Securities.

         SECTION 2.2. Notices. All notices, requests, consents and demands shall
be in writing and shall be personally delivered, mailed (registered or certified
mail,  return  receipt  requested,  postage  prepaid),  telecopied  or  sent  by
overnight courier service, to the Company at:

                  Mark Bibi
                  Unilab Corporation
                  401 Hackensack Avenue
                  Hackensack, NJ 07601
                  Telecopier: (201) 525-1331

with a copy to:
                  Donald S. Bernstein
                  Davis Polk & Wardwell
                  450 Lexington Avenue
                  New York, NY  10017
                  Telecopier: (212) 450-4800



<PAGE>


to Investor at:
                  J. Marvin Feigenbaum
                  Bio-Cypher Laboratories
                  Westwood Marquis
                  930 Hillgard Avenue
                  Los Angeles, CA 90024
                  Telecopier: (310) 824-0355

with a copy to:
                  Paul DeMuro
                  Latham & Watkins
                  505 Montgomery St.
                  Suite 1900
                  San Francisco, CA 94111
                  Telecopier: (415) 395-8095

                  Ken Liang
                  Oaktree Capital Management, LLC
                  333 South Grand Avenue, 28th Floor
                  Los Angeles, CA 90071
                  Telecopier: (213) 830-8522

or such other  addresses  as may be  furnished  in writing to the other  parties
hereto.  Any Person who becomes a Holder  hereafter  shall promptly  provide its
address and telecopier number to the Company.  Unless otherwise provided herein,
all such notices,  requests,  demands and other communications,  when personally
delivered,  shall be effective on delivery; when mailed (registered or certified
mail, return receipt requested,  postage prepaid),  shall be effective four days
after deposit in the mails  addressed as aforesaid;  when  telecopied,  shall be
effective  upon  confirmation  of receipt;  and, when sent by overnight  courier
service guaranteeing next-day delivery, shall be effective the next business day
following timely delivery to the courier.

         SECTION 2.3.  Entire  Agreement.  This  Agreement,  the Asset  Purchase
Agreement and the Note, and the other  documents and agreements  contemplated by
the Asset Purchase  Agreement to be in effect after the Closing Date thereunder,
constitute  the entire  agreement  of the  parties  with  respect to the matters
contemplated  herein. This Agreement supersedes any and all prior understandings
or agreements as to the subject matter of this Agreement.



<PAGE>


         SECTION 2.4.  Amendments,  Waivers and Consents.  Any provision in this
Agreement  to the  contrary  notwithstanding,  changes in or  additions  to this
Agreement may be made, and compliance with any covenant or provision  herein set
forth may be omitted or waived,  if the Company (i) shall obtain consent thereto
in writing  from the Holders  holding a majority of the  Registrable  Securities
then  outstanding  and (ii)  shall,  in each such case,  deliver  copies of such
consent  in  writing  to  any  Holders  who  did  not  execute   such   consent.
Notwithstanding the foregoing,  any amendment to this Agreement which materially
adversely  affects the rights or substantially  increases the obligations of one
or more Holders and which does not also affect all other  Holders  either to the
same degree or in proportion  to the amount of  Registrable  Securities  held by
each of them shall require the consent of the Holders  holding a majority of the
Registrable Securities adversely affected.

         SECTION 2.5. Binding Effect; Assignment.  This Agreement shall, subject
to the  provisions  of Section 1.10, be binding upon and inure to the benefit of
the personal  representatives,  successors and assigns of the respective parties
hereto  whether  by  assignment,  transfer,  merger,  by  operation  of  law  or
otherwise.  The  Company  shall  not have the right to  assign  its  obligations
hereunder or any interest herein without  obtaining the prior written consent of
the Holders holding a majority of the Registrable  Securities then  outstanding,
provided in accordance  with Section 2.04. If the Company becomes a wholly owned
subsidiary of a publicly traded corporation and the Holders receive common stock
of such corporation or a note of such corporation  convertible into common stock
of such  corporation in consideration  for the Notes or Registrable  Securities,
such corporation shall assume the obligations of the Company hereunder.

         SECTION 2.6. General.  The headings contained in this Agreement are for
reference  purposes  only  and  shall  not in any  way  affect  the  meaning  or
interpretation  of this Agreement.  In this Agreement the singular  includes the
plural,  the plural,  the singular,  the masculine  gender  includes the neuter,
masculine  and  feminine  genders.  This  Agreement  shall  be  governed  by and
construed under the laws of the State of New York.

         SECTION 2.7. Severability. If any provisions of this Agreement shall be
found by any court of competent jurisdiction to be invalid or unenforceable, the
parties hereby waive such provision to the extent that it is found to be invalid
or unenforceable.  Such provision shall, to the maximum extent allowable by law,
be modified  by such court so that it becomes  enforceable,  and,  as  modified,
shall be enforced as any other provision hereof, all the other provisions hereof
continuing in full force and effect.

         SECTION 2.8.  Counterparts.  This Agreement may be executed in 
counterparts, all of which together shall constitute one and the same
instrument.

         SECTION 2.9.  Specific  Performance.  The parties hereto recognize that
the rights of the parties  under this  Agreement are unique,  and,  accordingly,
each party shall,  in addition to such other  remedies as may be available to it
at law or in equity,  have the right to enforce its rights  hereunder by actions
for injunctive  relief and specific  performance to the extent permitted by law.
This  Agreement  is not  intended  to limit or abridge any rights of the parties
hereto which may exist apart from this Agreement.



<PAGE>


         IN WITNESS WHEREOF,  the parties have caused this  Registration Rights
Agreement to be duly executed as of the date first above written.

                             UNILAB CORPORATION


                             By:__________________________
                             Name:
                             Title:


                             PHYSICIAN'S CLINICAL LABORATORIES, INC.,
                             d/b/a BIO-CYPHER LABORATORIES


                             By:__________________________
                             Name:
                             Title:



                               GUARANTEE AGREEMENT


                  This GUARANTEE AGREEMENT (this  "Agreement"),  dated as of May
10, 1999, is made between each of the entities listed on Schedule 1 hereto (each
a "Guarantor" and collectively the "Guarantors"), Unilab Corporation, a Delaware
corporation  ("Buyer"),   and  Physician's  Clinical  Laboratory,   Inc.,  d/b/a
Bio-Cypher Laboratories, a Delaware corporation (the "Company").

                  Buyer  and the  Company  are  parties  to the  Asset  Purchase
Agreement  dated as of April 5, 1999 (the  "Purchase  Agreement"),  pursuant  to
which the Company proposes to sell  substantially all of its assets to Buyer. To
induce  Buyer to enter into the  Purchase  Agreement  and as a condition  to the
obligations of Buyer to consummate the transactions contemplated thereunder, the
Guarantors have agreed to guarantee,  on a several basis, but not on a joint and
several basis, the indemnification obligations of the Company under the Purchase
Agreement on the terms and subject to the conditions set forth herein.

                  Accordingly,  the  Guarantors,  Buyer and the Company agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

                  Section  1.01  Definitions.   Unless  otherwise  defined,  all
capitalized  terms  used in this  Agreement  that are  defined  in the  Purchase
Agreement  shall have the respective  meanings  assigned to them in the Purchase
Agreement.

                                   ARTICLE II

                                  THE GUARANTEE

                  Section 2.01  Guarantee.  Subject to the limitations set forth
in Section 2.04 below and the procedures  set forth in Section 2.05 below,  each
Guarantor,  on a  several  basis but not on a joint and  several  basis,  hereby
guarantees  to Buyer the full and punctual  payment and  performance  of (i) all
obligations of the Company to Buyer that may arise under the Second Cash Payment
Amount and Refund  Adjustment  under  Section  2.11(d) and  Section  2.12 of the
Purchase  Agreement (ii) all  obligations of the Company to Buyer that may arise
under  Article  11 of the  Purchase  Agreement;  provided,  that  if  Buyer  has
exercised  its  right of  set-off  pursuant  to  Section  11.03 of the  Purchase
Agreement,  the Guarantors  shall have no liability under this Agreement for any
breach of Section  5.08 of the  Purchase  Agreement,  (iii) any and all  Damages
incurred or suffered by Buyer in  connection  with or as a result of any efforts
by any Person to  challenge  the  validity,  legality or  enforceability  of the
transactions provided for in the Purchase Agreement on the basis of the adequacy
of the consideration  paid to the Company,  (iv) any and all Damages incurred or
suffered by Buyer in any way  relating to or arising out of or in respect of any
case or other proceeding seeking the liquidation, reorganization or other relief
with  respect to the Company or its debts under any  bankruptcy,  insolvency  or
other  similar law now or  hereafter in effect or seeking the  appointment  of a
trustee,  receiver,  liquidator,  custodian  or other  similar  official  of the
Company  or any  substantial  part of its  property  (any  such  case  or  other
proceeding,  a "Bankruptcy  Proceeding")  (excluding for purposes of this clause
(iv) any Damages resulting from any delay or other limitation on Buyer's ability
to realize  the full  benefits  contemplated  by  Sections  2.05 and 2.08 of the
Purchase  Agreement),  and (v) any and all Damages incurred or suffered by Buyer
in  enforcing  or  obtaining  payment of any  amounts  payable by any  Guarantor
hereunder  (clauses (i), (ii),  (iii), (iv) and (v) collectively the "Guaranteed
Obligations")  at such  time as those  obligations  become  due and  payable  in
accordance with the procedures set forth in Section 2.05 of this Agreement.

                  Section 2.02 Acknowledgments,  Waivers and Consents.  (a) Each
Guarantor  acknowledges  that  the  obligations  undertaken  by  it  under  this
Agreement  involve the guarantee of obligations of Persons other than itself and
that such obligations are absolute and  irrevocable.  In full recognition and in
furtherance of the foregoing,  each Guarantor agrees that, subject to and except
as provided otherwise in the limitations set forth in Section 2.04 below and the
procedures  set  forth  in  Section  2.05  below,  and  without   affecting  the
enforceability  or  effectiveness of this Agreement in accordance with its terms
and without  affecting,  limiting,  reducing,  discharging  or  terminating  the
respective  liability  of any  Guarantor,  or the rights,  remedies,  powers and
privileges of Buyer under this  Agreement,  Buyer may, at any time and from time
to time and without notice or demand of any kind or nature whatsoever:

                  (i) accept or  receive  (including  from any other  Guarantor)
partial  payments  on the  Guaranteed  Obligations  (whether  as a result of the
exercise of any right, remedy, power or privilege or otherwise);

                  (ii) release any Person  (including any other  Guarantor) from
any  personal  liability  with  respect  to all or any  part  of the  Guaranteed
Obligations;

                  (iii) settle,  compromise,  release, liquidate or enforce upon
such terms and in such manner as Buyer may  determine or as  applicable  law may
dictate all or any part of the Guaranteed Obligations as to the Company;

                  (iv) proceed  against the Company,  any Guarantor (but only as
to its Proportionate Share (as defined below) of the Guaranteed  Obligations) or
any  other  Person  for  or  relative  to  all or  any  part  of the  Guaranteed
Obligations  and exercise the rights,  remedies,  powers and privileges of Buyer
under the Purchase Agreement or otherwise in such order and such manner as Buyer
may in its discretion determine,  without any necessity first to proceed against
any other Person or to enforce any right,  remedy,  power or privilege as to any
other Person before  commencing to proceed  against or otherwise to enforce this
Agreement as to any Guarantor; and

                  (v) enter into such other  transactions  or business  dealings
with any other  Guarantor,  the  Company,  any  subsidiary  or  affiliate of the
Company or any other Person as Buyer may desire.

         (b) The  enforceability  and  effectiveness  of this  Agreement and the
liability of the Guarantors,  and the rights, remedies, powers and privileges of
Buyer, under this Agreement shall not be affected,  limited, reduced, discharged
or terminated,  and each Guarantor hereby expressly waives to the fullest extent
permitted by law any defense now or in the future arising  against the Buyer, by
reason of:

                  (i) any  failure  of Buyer to file or  enforce  a claim in any
bankruptcy  or  other  proceeding  with  respect  to the  Company  or any  other
Guarantor;

                  (ii) any  Bankruptcy  Proceeding  commenced  by or against the
Company  or a  Guarantor,  including  any  discharge  of or ban or stay  against
collecting  all or any part of its  Guaranteed  Obligation  as a result  of such
Bankruptcy Proceeding;

                  (iii) any  action  taken by Buyer that is  authorized  by this
Section  2.02 or otherwise  in this  Agreement or by any other  provision of the
Purchase Agreement;

                  (iv) any extension, renewal, settlement, compromise, waiver or
release  in  respect  of  any  Guaranteed  Obligation,  by  operation  of law or
otherwise;

                  (v) any  modification  or  amendment of or  supplement  to the
Purchase  Agreement or any related  document or agreement  pursuant to the terms
and conditions set forth therein;

                  (vi) the  existence  of any claim,  defense,  set-off or other
rights which any  Guarantor  may have at any time against the Company,  Buyer or
any other Person, whether in connection herewith or any unrelated  transactions,
provided that nothing  herein shall prevent the assertion of any claim,  defense
or other right, remedy, power or privilege that any Guarantor or the Company may
have against Buyer by separate suit or by defense,  cross-claim or  counterclaim
in an action brought by Buyer under this Agreement or otherwise;

                  (vii) any change in the  partnership  or other  organizational
existence,  structure or ownership  of the Company,  any  Guarantor or any other
Person; or

                  (viii)  the  invalidity  or  unenforceability,  in whole or in
part,  of the  Purchase  Agreement  or any  related  document  or  agreement  in
connection  with or as a result of any  efforts by any Person to  challenge  the
validity,  legality or  enforceability  of the transactions  provided for in the
Purchase Agreement on the basis of the adequacy of the consideration paid to the
Company.

         (c) Other than with respect to the  procedures  provided for in Section
2.05 of this  Agreement,  each Guarantor  expressly  waives,  for the benefit of
Buyer,  all  presentments,  demands  for  payment  or  performance,  notices  of
nonpayment or nonperformance,  protests, notices of protest, notices of dishonor
and all other notices or demands of any kind or nature  whatsoever  with respect
to the Guaranteed  Obligations,  and all notices of acceptance of this Agreement
or of the  existence,  creation or  incurring  of new or  additional  Guaranteed
Obligations.

         (d) Each  Guarantor  represents  and warrants  that it has reviewed the
Purchase  Agreement  and is fully  familiar  with the  transaction  contemplated
thereby. Except as expressly required by the terms hereof, each Guarantor hereby
expressly waives and relinquishes any duty on the part of Buyer (should any such
duty exist) to disclose to any Guarantor any matter of fact or other information
related to the business, operations or condition (financial or otherwise) of the
Company or its  properties  or to the  Purchase  Agreement  or the  transactions
undertaken pursuant thereto or contemplated thereby.

         (e) Each  Guarantor  intends that its rights and  obligations  shall be
those expressly set forth in this Agreement and that its  obligations  shall not
be  affected,  limited,  reduced,  discharged  or  terminated  by  reason of any
principles or provisions of law that conflict with the terms of this Agreement.

         (f) The Company and Buyer agree and  acknowledge  that, in exchange for
the  Guarantors'  entry into this Agreement,  each Guarantor,  for itself and on
behalf of the Company,  shall have and be entitled to raise and assert,  against
Buyer or any other  Person  that may assert a claim in  respect of a  Guaranteed
Obligation, any and all rights, remedies, powers, privileges, claims or defenses
(other  than  set-offs  to which there has not been  consent by the  parties,  a
judgment or a final  determination in an arbitration)  that the Company may have
under the  Purchase  Agreement  or any related  document or  agreement,  and the
Company  hereby  assigns to the  Guarantors  any and all such rights,  remedies,
powers, privileges, claims and defenses in their entirety.

                  Section 2.03 Separate  Action.  Subject to the limitations set
forth in Section 2.04 below and the  procedures set forth in Section 2.05 below,
Buyer may bring and prosecute a separate action or actions against any Guarantor
whether or not the Company or any other  Guarantor  is joined in any such action
or a separate  action or actions  are  brought  against the Company or any other
Guarantor for all or any part of the Guaranteed Obligations.  The obligations of
each  Guarantor  under,  and  the  effectiveness  of,  this  Agreement  are  not
conditioned  upon the existence or continuation of any other guarantee of all or
any part of the Guaranteed Obligations.

                  Section 2.04 Limitation on Guarantee  Amount.  Notwithstanding
any other  provisions  of this  Agreement,  the  Guarantors'  liability  for the
Guaranteed Obligations shall be limited as follows:

                           (a)  (i)  the  aggregate  liability  of  all  of  the
         Guarantors for payments on account of the Guaranteed  Obligations  (the
         "Aggregate  Cap"),  shall not exceed for Damages pursuant to claims (A)
         as to which notice has been provided to the Company and the  Guarantors
         prior to the first  anniversary of the Closing Date,  $15,000,000 minus
         an aggregate amount equal to any and all  indemnification  payments the
         Company  has paid to, on behalf of or for the  benefit  of Buyer or any
         party  indemnified  by the Company  pursuant to the Purchase  Agreement
         ("Company  Payments")  on  account  of such  claims and (B) as to which
         notice has been provided to the Company and the Guarantors  between the
         period  commencing  on the first  anniversary  of the Closing  Date and
         ending on the Second Anniversary of the Closing Date, the lesser of (1)
         $10,000,000  minus any Company Payments for claims made on or after the
         first  anniversary  of the  Closing  Date,  but  prior  to  the  Second
         Anniversary  of the Closing Date, or (2)  $15,000,000  minus the sum of
         (x) the  aggregate of payments made by the  Guarantors  and the Company
         Payments paid pursuant to clause (A) above and (y) any Company Payments
         for claims made on or after the first  anniversary  of the Closing Date
         but prior to the Second  Anniversary  of the Closing Date, and (ii) the
         aggregate   liability  of  each  Guarantor  on  account  of  Guaranteed
         Obligations shall not exceed a total of that Guarantor's  Proportionate
         Share (as defined in (c) below) of the Aggregate Cap;

                           (b)  the  Guarantors  shall  not be  liable  for  any
         Guaranteed Obligations to the extent the aggregate amount of Damages to
         which Buyer is entitled (as established  pursuant to the procedures set
         forth in Section 2.05 below) is less than or equal to $1.0 million (the
         "$1.0 million Threshold");  provided, however, that (i) this limitation
         shall  not  apply to any  Damages  incurred  or  suffered  by the Buyer
         arising out of any Excluded  Liability or pursuant to Section  2.01(i),
         Section 2.01(iii), Section 2.01(iv) or Section 2.01(v) hereof, and (ii)
         any  Damages  paid by any  Guarantor  pursuant  to section  (i) of this
         proviso  shall not be included in the  calculation  of the $1.0 million
         Threshold; and

                           (c)  Each  Guarantor's   portion  of  any  Guaranteed
         Obligations  ("Proportionate  Share")  is set  forth as the  percentage
         listed opposite that Guarantor's name on Schedule I to this Agreement.

                           (d)  No  Guarantor  shall  have  any  liability  with
         respect  to any claim by Buyer  for  Damages  or any  other  Guaranteed
         Obligation  unless it shall have received  written notice of such claim
         in accordance with the terms hereof prior to the second  anniversary of
         the Closing Date.

                  Section 2.05  Procedures.  Buyer shall provide each  Guarantor
with written notice of all claims for Damages  concurrently with and in the same
manner as it  provides  or is required to provide any such notice to the Company
in  accordance  with the  provisions  of Article 11 of the  Purchase  Agreement,
whereupon the Guarantors  will have the same rights as an  "Indemnifying  Party"
under the Purchase  Agreement  with  respect to such claims.  Subject to Section
2.04(d) hereof,  failure by Buyer to so notify the Guarantors  shall not relieve
any Guarantor  from any liability  hereunder to the extent such Guarantor is not
prejudiced as a result thereof.

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES.

                  As of the  Closing  Date,  each  Guarantor,  with  respect  to
itself, represents and warrants to Buyer that:

                  Section 3.01 Financial  Information.  True and complete copies
of the most recent financial  statements of such Guarantor,  have been delivered
to Buyer and each of same are true,  accurate and complete and fairly present in
accordance  with  GAAP  such  Guarantor's  financial  condition  as of the dates
thereof and no  material  and adverse  change has  occurred in such  Guarantor's
financial condition since the respective dates thereof.

                  Section 3.02 No Violation. Execution, delivery and performance
by  such  Guarantor  of its  obligation  hereunder,  including  payment  by such
Guarantor of its  Proportionate  Share of the  Guaranteed  Obligations  will not
constitute a violation of its  certificate of  incorporation  or bylaws or other
constitutive  documents,  any law, order,  regulation,  contract or agreement to
which such Guarantor is a party or by which such  Guarantor or such  Guarantor's
property may be bound.

                  Section 3.03 No Litigation. There is no litigation now pending
or, to the best of such  Guarantor's  knowledge  threatened in writing,  against
such Guarantor which, if adversely decided, would have a material adverse effect
on such  Guarantor's  financial  condition or ability to perform its obligations
under this Agreement.

                  Section 3.04 Entity Matters. Such Guarantor is duly organized,
validly  existing  and  in  good  standing  under  the  laws  of  its  state  of
organization,  has all requisite power and authority to execute and deliver this
Agreement,  to conduct its business and to own its property as now  conducted or
owned, and is qualified to do business in all jurisdictions where the nature and
extent of its business is such that such  qualification  is required by law. All
required entity actions and proceedings  have been duly taken so as to authorize
the execution, delivery and performance by such Guarantor of this Agreement, and
Oaktree Capital Management, LLC ("OCM") has been duly authorized to execute this
Agreement on behalf of the Guarantor. The execution, delivery and performance by
such  Guarantor  of this  Agreement  and the  consummation  of the  transactions
contemplated  hereby  require no action by or in respect of, or filing with, any
Governmental Authority.

                  Section 3.05 Valid and Binding.  This Agreement  constitutes a
legal, valid and binding obligation of the Guarantor,  enforceable in accordance
with its terms, subject to applicable  bankruptcy,  insolvency,  reorganization,
moratorium or other laws affecting  creditors'  rights  generally and subject to
general  principles of equity,  regardless of whether considered in a proceeding
in equity or at law.

                  Section 3.06 Solvency.  After giving effect to its obligations
hereunder,  (i) the fair value of the assets of such  Guarantor  is greater than
the total amount of such Guarantor's  liabilities,  including without limitation
any and all fixed or contingent,  matured or unmatured,  disputed and undisputed
liabilities;  (ii)  such  Guarantor  is able to pay all of its  debts  and other
liabilities  as the same become due and payable;  and (iii) such  Guarantor does
not  intend  to,  nor  does it  believe  that it  will,  incur  debts  or  other
liabilities  that  would  be  beyond  its  ability  to pay  as  such  debts  and
liabilities become due and payable.

                                   ARTICLE IV

                                   COVENANTS.

                  So long as this  Agreement  is in effect and until  payment in
full of all of the Guaranteed Obligations,  each Guarantor, as to itself, agrees
as follows:

                  Section 4.01  Notices of Material Events. Such Guarantor will
furnish to Buyer prompt written
notice of the following:

                           (a) the filing or commencement of any action, suit or
         proceeding  by or  before  any  arbitrator  or  Governmental  Authority
         against or affecting the Guarantor that, if adversely determined, could
         reasonably  be  expected  to  have a  material  adverse  effect  on the
         Guarantor's   financial   condition  or  its  ability  to  perform  its
         obligations under this Agreement; and

                           (b) any other  development  that results in, or could
         reasonably be expected to result in, a material  adverse  effect on the
         Guarantor's   financial   condition  or  its  ability  to  perform  its
         obligations under this Agreement.

                  Section 4.02  Existence;  Conduct of Business.  Subject to the
terms of its respective constitutive documents,  such Guarantor will do or cause
to be done all things reasonably  necessary to preserve,  renew and keep in full
force and effect its legal existence and any governmental  approvals material to
the conduct of its business.

                  Section 4.03 Payment of  Obligations.  Such Guarantor will pay
its obligations  that, if not paid, could result in a material adverse effect on
the Guarantor's  financial condition or ability to perform its obligations under
this Agreement before any such obligation shall become materially  delinquent or
in  default,  except any such  obligation  (a) the  validity  or amount of which
obligation is being contested in good faith by appropriate  proceedings,  or (b)
with  respect  to which  such  Guarantor  has set  aside on its  books  adequate
reserves.  Each  Guarantor  shall at all times maintain its assets such that the
fair  value  thereof  is  greater  than such  Guarantor's  liabilities  and such
Guarantor  is able to pay all of its  debts and  other  liabilities  as the same
become due and payable.

                  Section  4.04  Maintenance  of  Properties;   Insurance.  Such
Guarantor  will:  (a) keep and maintain all property  material to the conduct of
its  business  in good  working  order  and  condition,  ordinary  wear and tear
excepted,  and (b) maintain,  with  financially  sound and  reputable  insurance
companies,  insurance in such amounts and against such risks as are  customarily
maintained by companies engaged in the same or similar  businesses  operating in
the same or similar locations.

                  Section 4.05  Compliance with Laws. Such Guarantor will comply
with all governmental laws, rules and regulations applicable to it, except where
the failure to do so, individually or in the aggregate,  could not reasonably be
expected to result in a material  adverse  effect on the  Guarantor's  financial
condition or ability to perform its obligations under this Agreement.

                                    ARTICLE V

                            MISCELLANEOUS PROVISIONS

                  Section  5.01  Limitations  on  Recourse.  Neither OCM nor any
officer, director, member, employee, shareholder,  investment manager, director,
representative, fiduciary or controlling person of OCM or of any Guarantor shall
have any personal  obligations or liability to Buyer under or in connection with
this Agreement.  With respect to obligations of any Guarantor arising hereunder,
Buyer shall look for payment or  satisfaction  solely to the assets and property
of such Guarantor and not to OCM, any other  affiliate of such  Guarantor  other
than the other Guarantors or OCM, or any officer,  director,  member,  employee,
shareholder,   investment  manager,  director,   representative,   fiduciary  or
controlling person of or investor in OCM or such Guarantor.

                  Section  5.02  Notices.   All  notices,   requests  and  other
communications  provided for in this Agreement shall be given or made in writing
and delivered by hand or courier service, mailed by certified or registered mail
or sent by telecopy to the intended  recipient as specified  below or, as to any
party,  at such other address as is designated by that party in a notice to each
other  party.  Except  as  otherwise  provided  in  this  Agreement,   all  such
communications shall be deemed to have been duly given or made upon receipt.

      To the Guarantors c/o:             Oaktree Capital Management, LLC
                                         333 South Grand Ave., 28th Floor
                                         Los Angeles, CA  90071
                                         Telephone:   (213) 830-6422
                                         Telecopy:    (213) 830-8522
                                         Attention:   Kenneth Liang

             With a copy to:             Milbank, Tweed, Hadley & McCloy LLP
                                         601 S. Figueroa Street, 30th Floor
                                         Los Angeles, CA  90017
                                         Telephone:   (213) 892-4000
                                         Telecopy:    (213) 629-5063
                                         Attention:   Robert Jay Moore/
                                                      Thomas R. Kreller

                  To Buyer:              Unilab Corporation
                                         401 Hackensack Avenue
                                         Hackensack, NJ  07601
                                         Telephone:
                                         Telecopy:    (201) 525-1331
                                         Attention:   Mark L. Bibi

               With a copy to:           Davis Polk & Wardwell
                                         450 Lexington Avenue
                                         New York, NY  10016
                                         Telephone:   (212) 450-4000
                                         Telecopy:    (212) 450-4800
                                         Attention:   Donald S. Bernstein

               To the Company:           Bio-Cypher Laboratories
                                         c/o J. Marvin Feigenbaum
                                         Westwood Marquis
                                         930 Hilgard Avenue
                                         Los Angeles, CA  90024
                                         Telecopy:  (310) 824-0355

               With a copy to:           Latham & Watkins
                                         505 Montgomery Street, Ste. 1900
                                         San Francisco, CA  94111
                                         Telephone:   (415) 391-0600
                                         Telecopy:    (415) 395-8095
                                         Attention:   Paul DeMuro

Buyer  hereby  agrees  that it shall  provide  to each  Guarantor  copies of all
notices   delivered  to  the  Company   pursuant  to  the   Purchase   Agreement
simultaneously  with its  delivery  of such  notices to the  Company;  provided,
however,  that any failure or delay in  providing  any such notice to any of the
Guarantors shall only relive such Guarantors of their  obligations  hereunder to
the extent that any such  Guarantor is materially  prejudiced by such failure or
delay to notify.

                  Section 5.03 Reinstatement in Certain  Circumstances.  Subject
to Section 2.04 hereof, each Guarantor's  obligations  hereunder shall remain in
full force and effect until all Guaranteed Obligations shall have been performed
in full. If at any time any Company Payment is required under  applicable law or
court order to be  rescinded  or must be  otherwise  restored or returned to the
Company by Buyer, whether pursuant to a Bankruptcy Proceeding or otherwise, each
Guarantor's  obligations hereunder with respect the Guaranteed Obligations shall
be  reinstated  at such time to the  extent  that  such  Company  Payment  is so
rescinded or otherwise restored or returned by Buyer.

                  Section  5.04  Waiver by  Guarantors.  Subject to the terms of
each of Section 2.02(f) and Section 2.05 hereof to the fullest extent  permitted
by law, each Guarantor irrevocably waives any right, whether legal or equitable,
statutory  or  non-statutory,  to require  Buyer to proceed  against or take any
action  against or any remedy with respect to the Company or any other Person or
make presentment or demand for performance or give any notice of  nonperformance
before Buyer may enforce its rights hereunder against any Guarantor.

                  Section 5.05 Subrogation.  Upon making payment with respect to
any  Guaranteed  Obligation   hereunder,   the  applicable  Guarantor  shall  be
subrogated  to the rights of the payee  against the Company with respect to such
obligation.

                  Section 5.06 Waiver.  Subject to the  procedures  set forth in
Section 2.05 of this Agreement, no failure or delay by Buyer in exercising,  nor
any single or partial exercise of, any remedy,  right,  power or privilege under
this  Agreement  or the  Purchase  Agreement  shall  operate as a waiver of that
remedy,  right, power or privilege,  nor shall any single or partial exercise of
that remedy, right, power or privilege preclude any other or further exercise of
that remedy,  right,  power or  privilege  or the exercise of any other  remedy,
right, power or privilege. The remedies,  rights, powers and privileges provided
by this  Agreement are  cumulative  and not  exclusive of any remedies,  rights,
powers or privileges provided by the Purchase Agreement or by law.

                  Section 5.07  Amendments,  Etc. No provision of this Agreement
may be waived,  modified  or  supplemented  except by an  instrument  in writing
signed by each of the Guarantors and Buyer.

                  Section 5.08  Successors and Assigns.  This Agreement shall be
binding  upon and inure to the  benefit  of its  parties  and  their  respective
successors and assigns. None of the Guarantors may assign or transfer its rights
or obligations under this Agreement without the prior written consent of Buyer.

                  Section 5.09 Agreements Superseded.  This Agreement supersedes
all prior agreements and understandings, written or oral, among the parties with
respect to the subject matter of this Agreement.

                  Section 5.10  Severability.  Any  provision of this  Agreement
that is  prohibited  or  unenforceable  in any  jurisdiction  shall,  as to that
jurisdiction,   be   ineffective   to  the   extent  of  that   prohibition   or
unenforceability   without   invalidating  the  remaining   provisions  of  this
Agreement,  and any such  prohibition or  unenforceability  in any  jurisdiction
shall  not  invalidate  or  render  unenforceable  that  provision  in any other
jurisdiction.

                  Section 5.11  Counterparts.  This Agreement may be executed in
any number of counterparts, all of which taken together shall constitute one and
the same  instrument,  and any of the parties to the  Agreement may execute this
Agreement by signing any such counterpart.  Delivery of an executed  counterpart
of a signature  page to this Agreement by hand or by telecopy shall be effective
as the delivery of a fully executed counterpart of this Agreement.

                  Section 5.12 Governing Law;  Submission to Jurisdiction.  THIS
AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE
STATE OF NEW YORK APPLICABLE TO CONTRACTS MADE AND PERFORMED IN THE STATE OF NEW
YORK. EACH PARTY HEREBY SUBMITS TO THE  NONEXCLUSIVE  JURISDICTION OF THE UNITED
STATES DISTRICT COURT FOR THE SOUTHERN  DISTRICT OF NEW YORK AND OF ANY NEW YORK
STATE  COURT  SITTING IN NEW YORK CITY,  NEW YORK FOR THE  PURPOSES OF ALL LEGAL
PROCEEDINGS  ARISING OUT OF OR RELATING TO THIS  AGREEMENT  OR THE  TRANSACTIONS
CONTEMPLATED BY THIS AGREEMENT.  EACH PARTY  IRREVOCABLY  WAIVES, TO THE FULLEST
EXTENT  PERMITTED BY  APPLICABLE  LAW, ANY  OBJECTION  THAT IT MAY NOW OR IN THE
FUTURE HAVE TO THE LAYING OF THE VENUE OF ANY SUCH PROCEEDING  BROUGHT IN SUCH A
COURT AND ANY CLAIM  THAT ANY SUCH  PROCEEDING  BROUGHT IN SUCH A COURT HAS BEEN
BROUGHT IN AN INCONVENIENT FORUM.

                  Section 5.13 Waiver of Jury Trial.  EACH OF THE GUARANTORS AND
BUYER HEREBY  IRREVOCABLY WAIVE, TO THE FULLEST EXTENT PERMITTED BY LAW, ANY AND
ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO
THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT.

                  Section  5.14 No Third  Party  Beneficiaries.  The  terms  and
provisions of this  Agreement are intended  solely for the benefit of each party
hereto and their respective  successors or permitted assigns,  and it is not the
intention of the parties to confer third-party beneficiary rights upon any other
Person.



<PAGE>



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


                                 UNILAB CORPORATION,


                                 By:_______________________________
                     Title:

                                 PHYSICIAN'S CLINICAL LABORATORY, INC.,


                                 By:_______________________________
                     Title:


                   GUARANTORS:

                                 OCM OPPORTUNITIES FUND, L.P.
                                 By:  Oaktree Capital Management, LLC
                                 Its:  General Partner


                                 By:_______________________________


                                 By:_______________________________



                                 OCM OPPORTUNITIES FUND II, L.P.
                                 By:  Oaktree Capital Management, LLC
                                 Its:  General Partner


                                 By:_______________________________


                                 By:_______________________________


                       COLUMBIA/HCA MASTER RETIREMENT TRUST (Separate Account I)
                                 By:  Oaktree Capital Management, LLC
                                 Its:  Investment Manager


                                 By:_______________________________


                                 By:_______________________________


                      COLUMBIA/HCA MASTER RETIREMENT TRUST (Separate Account II)

                                 By:  Oaktree Capital Management, LLC
                                 Its:  Investment Manager


                                 By:_______________________________


                                 By:_______________________________



<PAGE>



                                   Schedule I



Fund or Account                                                    Percentage

OCM Opportunities Fund, L.P.                                           54.0%

Columbia/HCA Master Retirement  Trust (Separate Account I)              4.0%

OCM Opportunities Fund II, L.P.                                        41.0%

Columbia/HCA Master Retirement Trust (Separate Account II)              1.0%







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