Document:

Prepared by MERRILL CORPORATION www.edgaradvantage.com

   EXHIBIT 10.13  

October 11,
2000 

Lavi
Lev

[address] 

Re:
Transition Agreement 

    Dear
Lavi: 

    It
is understood and agreed that you and MIPS Technologies, Inc. ("MIPS" or "Company") mutually wish to enter into this Transition Agreement under which you will immediately
resign your executive position with MIPS but continue to be employed by the Company during a transition period. The following sets forth our mutual agreement with respect to the terms of your
transition arrangement. 

    1. (a)  It
is agreed that you will resign your executive position as Senior Vice President of Engineering as of the close of business on
October 11, 2000 (the "Transition Date"), but that you will remain as a non-executive employee of the Company for a transition period performing special projects as assigned by the
CEO until the close of business on October 25, 2001 or such earlier date as determined in accordance with Paragraph 9 below (the "Resignation Date"). During the transition period, you
will receive a salary of $20,970 per month. The Company shall provide you with adequate office space and support staff for the performance of your services during the transition period. You will also
continue to be eligible for MIPS medical, dental and vision benefits through the Resignation Date. It is understood and agreed that you shall be responsible for election of and payment for any COBRA
benefit continuation coverage on or after the Resignation Date. Your outstanding options shall continue to vest through the Resignation Date. On the Resignation Date, all vesting shall immediately
stop and your ability to exercise such options will be governed by the terms of each of the applicable option plans and the respective option award agreements. As of the Resignation Date, you will
resign any position you may hold as an employee, officer or director of the Company or of any subsidiary of the Company. In this regard, you agree to execute documents evidencing such resignations as
are required by local laws and as reasonably requested by the Company. 

    (b) On
the Resignation Date, the Company will pay your accrued vacation balance, if any, as of the Resignation Date. In addition, any accumulated funds in your ESPP
account will be returned to you following the Resignation Date in accordance with the terms of that plan. You will not be eligible for any payment under the FY2001 Executive Bonus Plan or any other
Company bonus plan. 

    (c) Nothing
on this Transition Agreement shall be construed to prohibit you from accepting full-time employment with another employer during the transition
period, subject to your fulfilling your obligations hereunder, including, without limitation, your obligations under Paragraphs 4, 5 and 6, and under your confidentiality and proprietary information
agreement with the Company. 

    2.  In
consideration of your unconditional acceptance of this Transition Agreement, you and the Company agree to the following with respect to your various outstanding
loans from the Company; 

    (a) The
loan agreement under that certain Promissory Note (Forgivable Loan) dated January 9, 1997 in the original sum of $400,000, shall be forgiven in full as
of the Transition Date. 

    (b) Notwithstanding
the terms of your offer letter dated March 15, 1998 and the terms of your loan agreement under that certain Amended and Restated Promissory
Note Secured by Deed of Trust (Balloon Loan) dated March 1, 1998 in the original sum of $250,000, any Resignation 

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Date prior to March 1, 2002 shall not cause the payment due date to MIPS of the principal amount of $250,000 and any accrued interest to be earlier than March 1, 2002. Except as
expressly set forth in the prior sentence, this loan shall continue in accordance with its terms and will continue to be secured by the second Deed of Trust on your current residence. 

    (c) Notwithstanding
the terms of your offer letter dated March 15, 1998 and the terms of your loan agreement under that certain Amended and Restated Promissory
Note Secured by Pledge Agreement (Forgivable Loan) dated March 1, 1998 in the original sum of $250,000 any Resignation Date prior to
March 1, 2002 shall not cause the payment due date to MIPS of the principal amount of $250,000 any accrued interest to be earlier than March 1, 2002. Except as expressly set forth in the
prior sentence, this loan shall continue in accordance with its terms and will continue to be secured by the Pledge Agreement as set forth therein. 

    3.  Other
than the payments, benefits and services set forth in this Transition Agreement, or that may be made in the future under the terms of the existing
Indemnification Agreement between you and the Company or the indemnification provisions of the Company's bylaws or certificate of incorporation, or the compensation you may realize under the terms of
your existing stock option award agreements or the loan agreements specifically referenced in Paragraph 2 above, you have no expectation of, and shall make no other claims for payment, services
or any other compensation. Nothing in this Transition Agreement will affect your right to coverage under the Company's Directors and Officers liability insurance for actions taken while you were an
officer of the Company. 

    4.  You
agree that from the date of this Transition Agreement through the twelve-month period following the Resignation Date you shall not, directly or indirectly
solicit or influence any person in the employment of the Company or an affiliate entity to (i) terminate such employment, or (ii) accept employment or enter into any consulting
arrangement with any entity other than the Company or any affiliated entity. In addition, during the transition period and for the twelve-month period following the Resignation Date, you shall not
indirectly interfere with the customers, suppliers, clients or business of the Company or any affiliated entity in any manner. 

    5.  You
further agree, upon the Company's or its agent's request and reasonable notice, to cooperate with the Company in connection with any claim or litigation or
other matter about which you may have relevant information. Upon request, you will also provide the Company with information that you obtained from your employment with the Company regarding the
Company's business or operations. Additionally, you will immediately notify the Company's General Counsel if you receive any written or oral request for information from any persons (other than your
full-time employer), or their counsel, who are asserting or investigating claims or litigation asserted against, or otherwise adverse to, the Company. You will not disclose information to
such persons except as required by legal process. You will not disclose to anyone, except the Company, confidential or privileged matters obtained from or related to your employment with the Company,
except as required by law. 

    6.  You
acknowledged that, because of your position with the Company, you have specific knowledge of many types of information that are confidential and proprietary to
the Company, including, without limitation, its current and planned technology; its current and planned sales, marketing and corporate strategies; its customers and strategic business partners; and
the organizational structure, identity, skills and interests of its employees. You agree to continue to maintain the confidentiality of all confidential and proprietary information of the Company
pursuant to, and will continue to comply with all terms and conditions of, the proprietary information and invention agreement between you and the Company.
These obligations survive the termination of your employment or any consulting relationship with the Company and the termination of this agreement. 

    7.  You
agree, on behalf of yourself and your successors, heirs, assigns, attorneys, agents, and representatives, and each of them, to unconditionally and forever
release, and discharge the Company and its subsidiaries, its current and former officers, directors, employees, attorneys, agents, successors, 

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assigns and representatives, and each of them, of and from any and all debts, claims, liabilities, demands and causes of action on every kind, nature and description, including but not limited to any
claim under federal, state or local employment discrimination law (including because of race, color, national origin, ancestry, religion, creed, physical or mental disability, marital status, medical
condition, sexual orientation, or any other basis protected by national, state, or local law), or other law which you have or could assert against the Company as of the date of this agreement. In
addition, you agree to enter into a separate release agreement on similar terms and conditions on the Resignation Date. 

    8.  It
is further understood and agreed that as part of the consideration and inducement for the execution of this agreement, you specifically waive the provisions of
section 1542 of the California Civil Code, which reads as follows: 

"A
GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED
HIS SETTLEMENT WITH THE DEBTOR." 

    Notwithstanding
the provisions of section 1542, and for the purpose of implementing a full and complete release and discharge of the Company, you expressly acknowledge that
this agreement is intended to include in its effect, without limitation, all claims described herein, whether known or unknown, and that this agreement contemplates the extinction of any and all such
claims, including claims for attorney's fees. 

    Furthermore,
you expressly waive any right to assert hereafter that any such claim, demand, obligation, or cause of action, has, through ignorance or oversight, been omitted from the
scope of this agreement. 

    9.  In
the event you should desire to terminate the employment relationship prior to October 25, 2001, you may terminate it immediately upon written notice to
the CEO of the Company. The Company agrees, however, that it will not terminate your employment prior to October 25, 2001 except for "Cause" in accordance with this Paragraph 9.
Termination of your employment with the Company shall be regarded as termination for Cause only upon: 

    (a) your
agreement to perform services as an employee, director, consultant or otherwise on behalf of a competitor of the Company (such as ARM, Tensilica, ARC, Lexra,
Intel (StrongArm product line), IBM (PowerPC product line), and Motorola (PowerPC product line)) unless otherwise expressly agreed in a writing signed by the CEO of the Company; 

    (b) your
willfully engaging in gross misconduct which is materially and demonstrably injurious to the Company, its business or reputation; 

    (c) your
committing a felony or an act of fraud against the Company or its affiliates; or 

    (d) your
breaching materially the terms of the restrictive covenants contained in this Transition Agreement or the terms of your employee confidentiality and
proprietary information agreement with the Company. 

    10.  You
declare and represent that no promise, inducement or other agreement not expressly contained in this Transition Agreement or referred to in this agreement, has
been made conferring any benefit upon you; that this agreement, the Indemnification Agreement, your stock option award agreements and the loan agreements specifically referred to in Paragraph 2
contain the entire agreement between the parties hereto with respect to any benefits conferred upon you; and that the terms of this agreement are contractual. 

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    11.  All prior agreements, understandings, oral agreements and writings between the parties hereto, including without limitation your offer letter dated
March 15, 1998, are expressly superseded hereby and are of no further force and effect, except as provided in the preceding paragraph. 

    12.  The
provisions of this Transition Agreement are severable. If a court of competent jurisdiction rules that any provision of this Transition Agreement is invalid or
unenforceable, the court's ruling will not affect the validity and enforceability of the other provisions of this agreement. 

    13.  In
the event of any dispute, claim, question, or disagreement arising out of or relating to your employment with the Company and the termination thereof, this
Transition Agreement or the breach thereof, the parties hereto agree to first use their best efforts to settle such matters in an amicable manner. Initially, they shall consult and negotiate with each
other, in good faith and, recognizing their mutual interests, attempt to reach a just and equitable solution satisfactory to both parties. If they do not reach such resolution within a period of sixty
(60) days, then upon written notice by either party to the other, any unresolved dispute, claim or differences shall be submitted to confidential mediation by a mutually agreed upon mediator.
Either party may, without inconsistency with this agreement, apply to any court having jurisdiction hereof and seek injunctive relief so as to maintain the status quo until such time as the mediation
is concluded or the controversy is otherwise resolved. The site of the mediation shall be in the County of Santa Clara, California. Each party shall each bear its own costs and expenses and an equal
share of the mediators' and any similar administrative fees. If any such dispute is finally determined in your favor, the Company shall reimburse all reasonable fees and expenses, including the
attorneys' and consultants' fees, which you incur in good faith in connection therewith. 

    14.  This
Transition Agreement is entered into under and governed by the laws of the State of California, without giving effect to the conflicts of laws principles
thereof. 

    To
accept this Transition Agreement, please sign and date this letter at the designated place below and return it to me or my designee within the prescribed time periods. 

Sincerely,

MIPS
Technologies, Inc. 

John
Bourgoin

Chairman and CEO 

    By
signing this letter, I acknowledge that I have had the opportunity to review this Transition Agreement carefully; that I have been represented by legal counsel of my choice; that I
understand the terms of this Transition Agreement; and I voluntarily agree to them. 

	 	 	Date:	 	 
	
	 	 	 	

	Lavi Lev	 	 	 	 

4<PAGE>

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

                                 SERACARE, INC.

                              Issuance and Sale of
                        __________ Shares of Common Stock

                                       to

                        ---------------------------------
                                Name of Investor

                               November ___, 2000.
--------------------------------------------------------------------------------

<PAGE>

         The Following documents were delivered in connection with the issuance
and sale by SeraCare, Inc., a Delaware corporation (the "COMPANY") of ______
shares of its Common Stock on November ___, 2000, to ________________________
_________________________________ (the "PURCHASER"):

1.   Stock Purchase Agreement by and between the Company and the Purchaser,
     dated as of November ___, 2000.

                                       2
<PAGE>

                            STOCK PURCHASE AGREEMENT

 This Stock Purchase Agreement (this "Agreement"), dated as of November ___,
 2000, is made and entered into by and between SeraCare, Inc., a Delaware
 corporation (the "Company"), and ______________________________________(the
 "Purchaser").

                               B A C K G R 0 U N D

                  A. The Company desires to issue and sell to Purchaser
_____________ shares of the Company's Common Stock, $.001 par value per share
(the "Common Stock"), to be sold at a price of $2.50 per share (the "Per Share
Purchase Price"), in accordance with and subject to the terms and conditions set
forth in this Agreement.

                  B. Subject to the terms and conditions hereof and in reliance
upon the representations, warranties and agreements contained herein, Purchaser
desires to purchase the Common Stock at an aggregate purchase price of
____________________________________________.

                                A G R E E M E N T

                  In consideration of the above premises and the
representations, warranties, covenants and agreements contained in this
Agreement, and for other good and valuable consideration, the receipt of which
is hereby acknowledged, the parties hereto agree as follows:

SECTION 1. PURCHASE AND SALE OF COMMON STOCK.

                  1.1 THE COMMON STOCK. Upon the terms and conditions contained
herein, the Company agrees to sell and issue to Purchaser, and Purchaser agrees
to purchase (the "Purchase") from the Company, at a purchase price of $2.50 per
share, ______________ shares of Common Stock (the "Shares"), at a closing to be
held as soon as practicable, and in no event later than _____________ __, 2000
(the "Closing"), on such date as the Company and the Purchaser may agree (the
"Closing Date") and shall be held at the offices of the Company or such other
place as the Company and Purchaser may agree to.

                  1.2 PAYMENT AND DELIVERY. At the Closing, the Company shall
deliver to Purchaser a stock certificate

                                       3
<PAGE>

registered in such name or names as Purchaser may designate representing the
Shares against delivery to the Company by Purchaser of the purchase price in the
sum of $____________ _______________ (which represents the product of the $2.50
price per share and the number of Shares, the "Aggregate Purchase Price"), and
the Aggregate Purchase Price will be paid by wire transfer or by cashier's check
payable to the order of the Company.

Section 2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                  The Company hereby represents and warrants to the Purchaser
that:

                  2.1 CORPORATE POWER. QUALIFICATION AND STANDING. The Company
is duly organized, validly existing and in good standing under the laws of the
State of Delaware and is qualified to transact business and is in good standing
in each jurisdiction in which its ownership of property or conduct of activities
requires such qualification, except where the failure to so qualify would not
materially adversely affect the operations of the Company taken as a whole. The
Company has all requisite corporate power and authority to enter into and to
carry out and perform its obligations under this Agreement.

                  2.2 SEC REPORTS; FINANCIAL STATEMENTS. The Common Stock of the
Company is registered under Section 12(b) or (g) of the Securities Exchange Act
of 1934 (the "1934 Act"). The Company has delivered to Purchaser its Annual
Report to stockholders and its Annual Reports on Form 10-K and its quarterly
reports on Form 10-Q filed with the SEC since the filing of the most recent Form
10-K (collectively, the "SEC Reports"). The SEC Reports did not (as of their
respective dates) contain any untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading. The audited and unaudited financial statements of the Company
included in the SEC Reports (the "Financial Statements") have been prepared in
accordance with generally accepted accounting principles applied on a consistent
basis (except as stated in such Financial Statements or the notes thereto) and
fairly present the financial position of the Company and its consolidated
subsidiaries as of the dates thereof and the results of their operations and
changes in financial

                                       4
<PAGE>

position for the periods then ended. The Company has timely filed with the SEC
all reports required to be filed by the Company under the 1934 Act since
February 29, 2000.

                  2.3 AUTHORIZATION; NO CONFLICT. The Company's execution and
delivery of this Agreement and issuance and sale of the Shares have been duly
authorized by all necessary corporate action, and the Shares, when issued and
paid for on the Closing Date, will be validly issued, fully paid and
non-assessable and the holders shall be entitled to all rights and preferences
accorded to a holder of Common Stock. The execution, delivery and performance by
the Company of its obligations under this Agreement do not and will not conflict
with or violate (i) the Restated Certificate of Incorporation of the Company,
dated February 6, 1996, as amended by the Certificate of Designations (the
"Restated Certificate of Incorporation") or Bylaws of the Company, (ii) in any
material respect any indenture, loan agreement, lease, mortgage or other
material agreement binding on the Company, (iii) any order of a court or
administrative agency binding on the Company, (iv) any applicable law or
governmental regulation; and such performance does not and will not require the
permission or approval of any governmental agency, and will not result in the
imposition or creation of any lien or charge against any assets of the Company.

                  2.4 BINDING EFFECT. This Agreement when duly executed and
delivered by the Company and is a legal, valid and binding obligation of the
Company, enforceable against the Company in accordance with its terms (subject
to applicable bankruptcy, insolvency, reorganization, moratorium or similar laws
relating to creditor's rights generally and the application of equitable
principles in any action, legal or equitable, and except as rights to indemnity
or contribution may be limited by applicable law).

                  2.5 NO DEFAULTS OR VIOLATIONS. The Company is not, and
immediately after the Closing will not be, in default under or in violation of
(a) its Restated Certificate of Incorporation or Bylaws, as amended, (b) any
indenture, mortgage, loan agreement, or other material agreement to which it is
a party and which has been filed by the Company with the SEC (the "Material
Agreements"), (c) any statute, rule, writ, injunction, judgment, decree, order
or regulation of any court or governmental authority having jurisdiction over
it, or (d) any license, permit,

                                       5
<PAGE>

certification or approval or requirement of any governmental authority or other,
in each case, in any way that could reasonably be expected to have a material
adverse effect on the business or condition (financial or otherwise) of the
Company, or the Company's ability to perform its obligations under this
Agreement.

                  2.6 NO MATERIAL ADVERSE CHANGE. Since February 29, 2000, there
have been no material adverse changes in the business or condition (financial or
otherwise) of the Company that are not reflected in the SEC Reports and the
Financial Statements.

                  2.7 NO CONFLICTING REGISTRATION RIGHTS. There are currently no
agreements which would preclude the Purchaser from participating in any
registrations of the Company's securities as permitted by the terms of Section
9.

                  2.8 MATERIAL LIABILITIES. Except for liabilities disclosed in
the Financial Statements or the SEC Reports, the Company and its Subsidiaries
have no material liabilities or obligations, absolute or contingent, other than
liabilities arising in the ordinary course of business, subsequent to the date
of the most recent audited Financial Statements or SEC Reports.

                  2.9 PROPERTIES. The Company and its Subsidiaries (i) have good
title to the properties and assets reflected in the Financial Statements as
owned by them, (ii) have valid leasehold interests in the properties leased by
them, and (iii) own or have the right to use under valid license agreements all
trademarks, trade names, copyrights, patents and other intellectual property
rights material to its business and regularly utilized by them, subject in each
case to no material liens, security interests or adverse claims, except as
disclosed in the Financial Statements or the SEC Reports.

                  2.10 LITIGATION. There are no material legal actions,
arbitrations, or administrative proceedings pending against the Company, except
for the matters disclosed in the SEC Reports and no actions or proceedings are
pending or, to the Company s best knowledge, threatened, which question the
validity of this Agreement or the Shares.

                                       6
<PAGE>

                  2.11 TAX MATTERS. The Company has filed or is in the process
of filing all tax returns required to be filed by it and has paid its taxes and
has made adequate accruals for tax liabilities on the Financial Statements in
accordance with generally accepted accounting principles.

                  2.12 BROKERS. The Company has not entered into any agreements
requiring the Company or Purchaser to pay any broker's, finder's or similar fee
or commission in connection with the transaction contemplated hereby.

                  2.13 CAPITALIZATION. As of the October 31, 2000, excluding the
Shares to be issued in connection with this Agreement, there are: 8,738,642
shares of the Company's Common Stock; and 22,500 shares of Series C Convertible
Preferred Stock respectively, which are issued and outstanding. The Company has
no present intention to redeem any shares of outstanding Common Stock and no
holders of any shares of the Company's issued and outstanding Common Stock have
been granted any redemption rights with respect thereto.

                  2.14 REQUIRED APPROVALS. Plasma collection centers located in
Danville, Virginia and Providence, Rhode Island are operating under Reference
Numbers pending licensing by the FDA. Except as set forth herein, the Company
has obtained all permits, approvals and certificates necessary to operate its
business as presently conducted at each of its locations.

                  2.15 NO GENERAL SOLICITATION. Neither the Company, nor any of
its affiliates, or, to its knowledge, any person acting on its or their behalf,
has engaged in any form of general solicitation or general advertising (within
the meaning of Regulation D under the 1933 Act) in connection with the offer or
sale of the Shares.

                  2.16 NO INTEGRATED OFFERING. Neither the Company, nor any of
its affiliates, nor any person acting on its or their behalf has, directly or
indirectly, made any offers or sales of any security or solicited any offers to
buy any security, under circumstances that would require registration of the
Shares under the Securities Act of 1933, as amended (the "1933 ACT").

                                       7
<PAGE>

Section 3. INVESTMENT REPRESENTATIONS.

Purchaser acknowledges that the Shares are not being registered under the 1933
Act, based, in part, on reliance that the issuance of the Shares is exempt from
registration under Section 4(2) of the 1933 Act as not involving any public
offering. Purchaser further acknowledges that the Company's reliance on such
exemption is predicated, in part, on the representations set forth below made by
Purchaser to the Company.

                            (a) Purchaser is an "accredited investor" as such
         term is defined under Rule 501(a) of the 1933 Act. Purchaser is
         acquiring the Shares solely for Purchaser's own account, for investment
         purposes only, and not with an intent to sell, or for resale in
         connection with any distribution of all or any portion of the Shares
         within the meaning of the 1933 Act;

                            (b) In evaluating the merits and risks of an
         investment in the Shares, Purchaser has relied upon the advice of
         Purchaser's legal counsel, tax advisors, and/or investment advisors;

                            (c) Purchaser is experienced in evaluating and
         investing in companies such as the Company. The Company has afforded
         Purchaser or Purchaser's advisors the opportunity during the course of
         negotiating the transactions contemplated by this Agreement to ask
         questions of and secure such information from the Company and its
         officers and directors as it deems necessary to evaluate the merits of
         entering into this Agreement. Purchaser also acknowledges that the
         Company has notified Purchaser that the Company is contemplating (i)
         one or more acquisitions of companies in the same or related industries
         as the Company, (ii) a possible financial restructuring including both
         the revolving line of credit and the $16,000,000 subordinated
         debentures and (iii) a possible private placement and/or public
         offering of the Company's Common Stock at some point in the future,
         however there can be no assurance that any acquisition, the financial
         restructuring, or the private placement and/or public offering will
         ever be completed;

                                       8
<PAGE>

                            (d) Purchaser is aware that an investment in
         securities of a thinly-traded corporation such as the Company may be
         non-marketable and may require Purchaser's capital to be invested for
         an indefinite period of time, possibly without return. Purchaser has no
         need for liquidity in this investment, has the ability to bear the
         economic risk of this investment, and can afford a complete loss of the
         Aggregate Purchase Price;

                            (e) Purchaser understands that the Shares being
         purchased hereunder are characterized as "restricted securities" under
         the federal securities laws since the Shares are being acquired from
         the Company in a transaction not involving a public offering and that
         under such laws and applicable regulations such securities may be
         resold without registration under the 1933 Act only in certain limited
         circumstances. Purchaser represents that Purchaser is familiar with
         Rule 144 promulgated under the 1933 Act, as presently in effect, and
         understands the resale limitations imposed thereby and by the 1933 Act;
         and

                            (f) At no time was Purchaser presented with or
         solicited by any public or promotional meeting, newspaper or magazine
         article, radio or television advertisement or any other form of general
         advertising relating to the purchase hereunder.

Section 4. CONDITIONS TO OBLIGATIONS OF THE PURCHASER.

            The obligation of the Purchaser to purchase the Shares is subject to
the fulfillment on or prior to the Closing Date of each of the following
conditions:

                  (a) REPRESENTATIONS AND WARRANTIES. The representations and
      warranties of the Company shall be true and correct in all material
      respects on the Closing Date;

                  (b) PERFORMANCE. All covenants, agreements and conditions
      contained in this Agreement to be performed or complied with by the
      Company on or prior to the Closing Date shall have been performed or
      complied with in all material respects;

                                       9
<PAGE>

                  (c) NO INJUNCTION. No statute, rule, regulation, executive
      order, decree, ruling or injunction shall have been enacted, entered,
      promulgated or endorsed by any court or governmental authority of
      competent jurisdiction which prohibits the consummation of any of the
      transactions contemplated by this Agreement; and

                  (d) PROCEEDINGS AND DOCUMENTS. All corporate and other
      proceedings in connection with the transactions contemplated hereby and
      all documents and instruments incident to such transactions shall be
      satisfactory in form and substance to the Purchaser and its counsel.

Section 5. LIMITATIONS ON DISPOSITION.

Purchaser agrees not to transfer the Shares except in accordance with the
express terms of this Section 5 and unless the proposed transferee agrees with
the Company in writing to be bound by Section 5.1 of this Agreement. Any
attempted transfer in violation of this Section 5 shall be void and of no
effect.

            5.1 COMPLIANCE WITH SECURITIES LAWS. Without in any way limiting the
representations set forth above, Purchaser further agrees not to make any
disposition of all or any portion of the Shares, except in compliance with
applicable federal and state securities laws and unless and until:

            (a) there is then in effect a registration statement under the 1933
      Act covering such proposed disposition and such disposition is made in
      accordance with such registration statement;

            (b) such disposition is made in accordance with Rule 144 under the
      1933 Act; or

            (c) Purchaser shall have notified the Company of the proposed
      disposition and shall have furnished the Company with a statement of the
      circumstances surrounding the proposed disposition, and if requested by
      the Company, Purchaser shall have furnished the Company with an opinion of
      counsel acceptable to Company counsel, that such disposition will not

                                       10
<PAGE>

      require registration under the 1933 Act and will be in compliance with
      applicable state securities laws.

Section 6. STOCK CERTIFICATE LEGEND.

Purchaser understands and acknowledges that the certificate evidencing the
Shares purchased by Purchaser hereunder (or evidencing any other securities
issued with respect thereto pursuant to any stock split, stock dividend, merger
or other form of reorganization or recapitalization) shall bear, in addition to
any other legends which may be required by this Agreement or applicable state
securities laws, the following legend:

                   THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED
                   UNDER THE SECURITIES ACT OF 1933, AS AMENDED ("1933 ACT") NOR
                   HAVE THEY BEEN REGISTERED OR QUALIFIED UNDER THE SECURITIES
                   LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE
                   PERMITTED UNLESS A REGISTRATION STATEMENT UNDER The 1933 ACT
                   IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS MADE IN
                   ACCORDANCE WITH RULE 144 UNDER The 1933 ACT, OR ZN THE
                   OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY),
                   REGISTRATION UNDER The 1933 Act IS UNNECESSARY IN ORDER FOR
                   SUCH TRANSFER TO COMPLY WITH THE 1933 ACT AND WITH APPLICABLE
                   STATE SECURITIES LAWS.

                   Upon request of a holder of Shares the Company shall remove
the foregoing legend or issue to such holder a new certificate therefor free of
any such legend, if the Company shall have received either an opinion of counsel
or a "No-action" letter of the SEC, in either case reasonably satisfactory in
substance to the Company and its counsel, to the effect that such legend is no
longer required.

Section 7. COVENANTS

The Company covenants and agrees as follows:

            (a) To file and keep available adequate current public information
      as is required to be filed and kept available for holders of restricted
      securities to be able to sell such securities pursuant

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<PAGE>

      to Rule 144 under the 1933 Act and any successor regulation;

            (b) To file with the SEC in a timely manner all reports and other
      documents required to be filed under the 1934 Act and to cause its shares
      of preferred stock to continue to be traded on the OTC Bulletin Board,
      NASDAQ or on a national securities exchange; and

            (c) To notify the SEC and NASDAQ, in accordance with their
      requirements, of the transactions contemplated by this Agreement, and
      shall take all other necessary action and proceedings as may be required
      and permitted by applicable law, rule and regulation, for the legal and
      valid issuance and sale of the Shares issued to the Purchaser or
      subsequent holder.

Section 8. MISCELLANEOUS.

                   8.1 COUNTERPARTS. This Agreement may be executed in one or
more counterparts, each of which shall be an original, and all of which together
shall constitute one and the same agreement.

                  8.2 GOVERNING LAW. This Agreement shall be governed by and
construed and enforced in accordance with the laws of the State of California
without regard to the conflicts of laws principles thereof.

                  8.3 JURISDICTION. All parties hereto irrevocably submit to the
non-exclusive jurisdiction of any California or Federal court sitting in the
state of California over any suit, action or proceeding brought by any Purchaser
arising out of or relatinq to this Agreement or the Shares.

                   8.4 CONSENT TO SERVICE. The Company consents to service of
 process in any suit, action or proceeding of the nature referred to in Section
 8.3 by mailing a copy thereof by registered or certified mail, postage prepaid,
 return receipt requested, to its address specified in or designated pursuant to
 Section 8.7 herein. Such service (i) shall be deemed in every respect effective
 service of process upon the Company in any such suit, action or proceeding and
 (ii) shall, to the fullest extent permitted

                                       12
<PAGE>

by law, be taken and held to be valid personal service upon and personal
delivery to the Company.

                   8.5 ASSIGNMENTS. This Agreement and all of the provisions
 hereof shall be binding upon and inure to the benefit of the parties hereto and
 their respective successors and permitted assigns.

                   8.6 SUBSCRIPTION. Purchaser acknowledges and agrees that if
 for any reason the Purchase does not close or if Purchaser's subscription is
 rejected for any reason, Purchaser shall have no claims against the Company,
 its directors and officers, stockholders, agents and affiliates and shall have
 no interest in the Company or in any property or assets of the Company other
 than for the return of the Aggregate Purchase Price, or any portion thereof,
 which has been previously delivered to the Company.

                   8.7 NOTICES. All notices and other communications required or
 permitted hereunder shall be in writing and shall be deemed given when actually
 delivered by hand, messenger, facsimile or courier service or, if mailed, four
 days after deposit in the U.S. mail, addressed (a) if to the Purchaser, as
 indicated below the Purchaser's signature, or at such other address as the
 Purchaser shall have furnished to the Company in writing, or (b) if to any
 other holder of any Shares, at the address of such holder as shown on the
 records of the Company, or (c) if to the Company, at its address set forth
 below or at such other address as the Company shall have furnished to the
 Purchaser and each such other holder in writing.

                   8.8 DELAYS OR OMISSIONS. No delay or omission to exercise any
  right, power or remedy accruing to any party to this Agreement (including any
  holder of Shares), upon any breach or default of another party under this
  Agreement, shall impair any such right, power or remedy of such party nor
  shall it be construed to be a waiver of any such breach or default, or an
  acquiescence therein, or of or in any similar breach or default thereafter
  occurring; nor shall any waiver of any single breach or default be deemed a
  waiver of any other breach or default theretofore or thereafter occurring. All
  remedies, either under this Agreement or by law or otherwise afforded to any
  party, shall be cumulative and not alternative.

                                       13
<PAGE>

                   8.9 SEVERABILITY. In any case any provision of this Agreement
shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

                   8.10 FURTHER ASSURANCES. The Company agrees to take such
actions and execute such other documents which the Purchaser may reasonably
request to carry out the intent of this Agreement and the transactions
contemplated hereby.

Section 9. REGISTRATION RIGHTS.

            9.1 REGISTRATION. Immediately upon the Closing Date of this
Agreement, the Company shall, at Company's expense, initiate the filing of a
Form S-3 Registration to register the Shares issued hereunder and shall use
their best efforts to insure an effective date for such registration statement
which is within 90 days of the Closing Date hereof. The Company shall also take
whatever actions are commercially reasonable and necessary to insure that such
registration statement remains effective for at least twenty four months from
the effective date thereof.

            9.2 REGISTRATION COVENANTS. Whenever required under this Section 9
to effect the registration of any Shares ("Registrable Securities"), the Company
shall, as expeditiously as reasonably possible:

            (i) Prepare and file with the SEC a registration statement or an
      amendment thereto with respect to such Registrable Securities and use its
      best efforts to cause such registration statement to become effective
      within 90 days and keep such registration statement effective for a period
      of not less than twenty four months from the date of conversion.

            (ii) Prepare and file with the SEC such amendments and supplements
      to such registration statement and the prospectus used in connection with
      such registration statement 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.

                                       14
<PAGE>

            (iii) Permit the Holder the right to review and comment as to
      information relating to Holder or the Registrable Securities included in
      the registration statement and furnish to the Holder such numbers of
      conformed copies of the registration statement and each amendment or
      supplement, including each prospectus and preliminary prospectus, in
      conformity with the requirements of the 1933 Act, and such other documents
      as the Holder may reasonably request in order to facilitate the
      disposition of Registrable Securities owned by Holder for so long as
      Holder desires to dispose of the securities covered by such registration
      statement (but not after Holder is free to sell such securities under the
      provisions of Rule 144(k) under the 1933 Act).

            (iv) Use its best efforts to register and qualify the securities
      covered by such registration statement under the securities or blue sky
      laws of such jurisdictions as shall be reasonably requested by Holder,
      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 and process in any such states or jurisdictions.

            (v) Notify Holder 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 material fact or omits to state a material
      fact required to be stated therein or necessary to make the statements
      therein not misleading in light of the circumstances then existing.

            (vi) Furnish, at the request of Holder, an opinion of counsel of the
      Company, dated the effective date or the closing date, as the case may be,
      of the registration statement, as to the due authorization and issuance of
      the securities being registered.

            (vii) Notify the Holder promptly after the Company shall have
      received notice thereof of the issuance of any stop order by the SEC
      suspending the effectiveness of such registration statement and use

                                       15
<PAGE>

      its best efforts to obtain withdrawal if such stop order should be issued.

            9.5 HOLDER COVENANT. The Holder will furnish to the Company in
connection with any registration under this Section 9 such information regarding
itself, the Registrable Securities and other securities of the Company held by
it, and the intended method of disposition of such securities as shall be
required to effect the registration of the Registrable Securities held by
Holder.

            9.6 INDEMNIFICATION. The Company shall indemnify, defend and hold
harmless each Holder of Registrable Securities which are included in a
registration statement pursuant to the provisions of this Section 9, any
underwriter (as defined in the 1933 Act) for such Holder, and the directors,
officers and controlling persons of such Holder or underwriter from and against
any and all claims, suits, demands, causes of action, losses, damages,
liabilities, costs or expenses ("Liabilities") to which any of them may become
subject under the 1933 Act or otherwise, arising from or relating to (i) any
untrue statement or alleged untrue statement of any material fact contained in
such registration statement, any prospectus contained therein or any amendment
or supplement thereto, or (ii) the omission or alleged omission to state therein
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; provided, however, that the Company shall not be liable in any such
case to the extent that any such Liability arises out of or is based upon an
untrue statement or alleged untrue statement or omission or alleged omission so
made in conformity with written information furnished by such person
specifically for use in the preparation thereof. This indemnification will
survive the transfer of the Shares.

            Each Holder of Registrable Securities included in a registration
pursuant to the provisions of this Section 9 shall indemnify, defend, and hold
harmless the Company, its directors, officers and controlling persons with
respect to, any and all Liabilities to which any of them may become subject
under the 1933 Act or otherwise, arising from or relating to (i) any untrue
statement or alleged untrue statement of any material fact contained in such
registration statement, any prospectus contained therein or any amendment or
supplement thereto, or (ii) the omission

                                       16
<PAGE>

or alleged omission to state therein 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, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was so made in reliance upon and in
conformity with written information furnished by or on behalf of such Holder for
use in the preparation thereof. This indemnification shall survive the transfer
of the Shares.

            Promptly after receipt by an indemnified party pursuant to the
provisions of this Section 9.6 of notice of the commencement of any action
involving the subject matter of the foregoing indemnity provisions, such
indemnified party shall, if a claim thereof is to be made against the
indemnifying party pursuant to the provisions of this Section 9.6, promptly
notify the indemnifying party of the commencement thereof; provided, however,
that the failure to so notify the indemnifying party shall not relieve it from
its indemnification obligations hereunder except to the extent that the
indemnifying party is materially prejudiced by such failure. If such action is
brought against any indemnified party and it notifies the indemnifying party of
the commencement thereof, the indemnifying party shall have the right to
participate in, and, to the extent that it may wish, jointly with any other
indemnifying party similarly notified, to assume the defense thereof, with
counsel satisfactory to such indemnified party, provided, however, if the
defendants in any action include both the indemnified party and the indemnifying
party and the indemnified party shall have reasonably concluded that there is
conflict of interest which would prevent counsel for the indemnifying party from
also representing the indemnified party, the indemnified party shall have the
right to select separate counsel to participate in the defense of such action on
behalf of such indemnified party at the expense of the indemnifying party. After
notice from the indemnifying party to such indemnified party of its election so
to assume the defense thereof, the indemnifying party shall not be liable to
such indemnified party pursuant to this Section 9.5 for any expense of counsel
subsequently incurred by such indemnified party in connection with the defense
thereof other than reasonable costs of investigation, unless (i) the indemnified
party shall have employed counsel in accordance with the provisions of the
preceding sentence,

                                       17
<PAGE>

or (ii) the indemnifying party shall not have employed counsel satisfactory to
the indemnified party to represent the indemnified party within a reasonable
time after the notice of the commencement of the action. An indemnifying party
shall not be responsible for amounts paid in settlement without its consent,
provided that its consent may not be unreasonably withheld. Upon any settlement
or entry of final judgment, the indemnifying part will promptly indemnify the
indemnified party.

            9.7 REGISTRATION EXPENSES. With respect to the inclusion of
Registrable Securities in a registration statement pursuant to this Section 9,
all fees, costs and expenses of and incidental to such registration shall be
borne by the Company. The fees, costs and expenses of registration to be borne
by the Company as provided in this Section 9.7 shall include, without
limitation, all registration, filing and NASD fees, printing expenses, fees and
disbursements of counsel and accountants for the Company, and all legal fees and
disbursements and other expenses of complying with state securities or Blue Sky
laws of any jurisdiction or jurisdictions in which securities are to be
registered and qualified. Fees and disbursements for counsel, accountants and
other costs of Purchaser, however, shall be borne by Purchaser.

            9.8 ASSIGNMENT OF REGISTRATION RIGHTS. The rights of the Purchaser
to have the Company register for resale Registrable Securities shall be
automatically assignable by the Purchaser to any assignee or transferee,
provided that such transfer shall have been made in accordance with the
applicable requirements of this Agreement. Notwithstanding a transfer by
Purchaser to a third party of a portion of the Shares, Purchaser shall retain
its registration rights with respect to all Registrable Securities held by
Purchaser. If any Shares are transferred by a third party to a subsequent
transferee, such subsequent transferee shall have no registration rights with
respect to any shares of common stock which may be issued upon conversion of
such Shares.

                                       18
<PAGE>

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

                             "The Company"
                             SeraCare, Inc.
                             A Delaware corporation

                             By:
                                -----------------------------
                             Name: Jerry L. Burdick
                             Title:Executive Vice President

                             Notice Address:

                             1925 Century Park East, Suite 1970
                             Los Angeles, California  90067

                             "Purchaser"

                             By:
                                ------------------------------
                             Name:
                             Title:
                                   ---------------------------

                             Notice Address:

                                       19

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