EXHIBIT 2.2

                            INVESTOR RIGHTS AGREEMENT

      THIS INVESTOR RIGHTS AGREEMENT dated as of December 1, 2002 (this
"Agreement") is entered into among University of Medicine and Dentistry of New
Jersey (the "University"), University Health Plans, Inc. (the "Company") and
Centene Corporation ("Centene").

                              PRELIMINARY STATEMENT

      A. Pursuant to a Stock Purchase Agreement dated as of August 2, 2002 among
the University, the Company and Centene (the "Purchase Agreement"), Centene is
purchasing from the University, contemporaneously with the execution and
delivery of this Agreement, a total of 16 shares (the "Initial Company Shares")
of the common stock, without par value, of the Company ("Company Common").

      B. Immediately after its sale of the Initial Company Shares to Centene,
the University will continue to own four shares of Company Common (the
"Additional Company Shares," and collectively with the Initial Company Shares,
the "Company Shares").

      C. Centene may, at its option, purchase the Additional Company Shares for
cash within nine months after the date hereof. If Centene does not exercise such
option, then, on the third anniversary of the date hereof (the "Exchange Date"),
the University and Centene will exchange (the "Exchange") the Additional Company
Shares for shares (the "Centene Shares") of the common stock, $0.001 par value
per share ("Centene Common"), of Centene or, at the election of Centene, for
cash.

      D. The University, the Company and Centene desire to, among other things,
(1) provide for certain rights and obligations of the University and Centene in
their capacities as stockholders of the Company prior to the Exchange, (2)
establish the terms of the Exchange, and (3) provide for certain registration
rights of the University with respect to its ownership of the Centene Shares
after the Exchange.

      NOW, THEREFORE, in consideration of the mutual promises hereinafter set
forth and other good and valuable consideration, the receipt of which is hereby
acknowledged, the parties hereto hereby agree as follows:

      1. Certain Definitions. As used in this Agreement, the following terms
shall have the following respective meanings:

            "Additional Company Shares" means the four shares of Company Common
      as set forth in the recitals hereto, together with (a) any other Company
      Equity Securities issued in respect of such shares (because of stock
      splits, stock dividends, reclassifications, recapitalizations or similar
      events) and (b) any other Company Equity Securities acquired by the
      University or its Affiliates in accordance with Section 5.

            "Affiliate" means, with respect to the University or Centene, any
      person or entity that, directly or indirectly, controls, is controlled by
      or is under common control with such party, including any officer or
      director of such party, provided that the Company shall not be deemed to
      constitute an Affiliate of the University or Centene for purposes of this
      Agreement.

            "Basic Amount" means, with respect to the University or Centene,
      such party's pro rata portion of the Company Equity Securities determined
      by multiplying the number of Company Equity Securities by a fraction, the
      numerator of which is the aggregate number of Company Shares then held by
      such party and the denominator of which is the total number of Company
      Shares then outstanding.




            "Beneficiary Party" means a party entitled to indemnification by
      Centene pursuant to paragraph (a) of Subsection 7.4 or a party entitled to
      receive payment by the University pursuant to paragraph (b) of Subsection
      7.4.

            "business day" means a day that is not a Saturday, a Sunday or a
      statutory or civic holiday in either the State of Missouri or the State of
      New Jersey.

            "Commission" means the Securities and Exchange Commission, or any
      other federal agency at the time administering the Securities Act.

            "Company Equity Securities" means (a) any shares of Company Common,
      (b) any other equity securities of the Company, including shares of
      preferred stock, (c) any option, warrant or other right to subscribe for,
      purchase or otherwise acquire any equity securities of the Company, or (d)
      any debt securities convertible into capital stock of the Company.

            "Company Sale" means:

                  (a)   a merger or consolidation in which:

                        (i)   the Company is a constituent party or

                        (ii)  a Company Subsidiary is a constituent party and
                              the Company issues shares of its capital stock
                              pursuant to such merger or consolidation,

                        except any such merger or consolidation in which the
                        holders of capital stock of the Company immediately
                        prior to such merger or consolidation continue to hold
                        immediately following such merger or consolidation more
                        than 50% by voting power of the capital stock of or
                        ownership interest in (A) the surviving or resulting
                        entity or (B) if the surviving or resulting entity is a
                        wholly owned subsidiary of another entity immediately
                        following such merger or consolidation, the parent
                        entity of such surviving or resulting entity; or

                  (b)   the sale, in a single transaction or series of related
                        transactions, (i) by the Company of all or substantially
                        all the assets of the Company (except where such sale is
                        to a wholly owned subsidiary of the Company) or (ii) by
                        the stockholders of the Company of more than 50% by
                        voting power of the then-outstanding capital stock of
                        the Company.

            "Company Subsidiary" means any corporation, partnership, trust,
      limited liability company or other non-corporate business enterprise in
      which the Company (or a Company Subsidiary) holds stock or other ownership
      interests representing (a) more that 50% of the voting power of all
      outstanding stock or ownership interests of such entity or (b) the right
      to receive more than 50% of the net assets of such entity available for
      distribution to the holders of outstanding stock or ownership interests
      upon a liquidation or dissolution of such entity.

            "Exchange Act" means the Securities Exchange Act of 1934, as
      amended.

            "Initial Company Shares" means the 16 shares of Company Common as
      set forth in the recitals hereto, together with (a) any other Company
      Equity Securities issued in respect of such shares (because of stock
      splits, stock dividends, reclassifications, recapitalizations or similar
      events) and (b) any other Company Equity Securities acquired by Centene or
      its Affiliates in accordance with Section 5.


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            "Notice of Acceptance" means a written notice from the University or
      Centene to the Company containing the information specified in Subsection
      5.2.

            "Notice of Offer" means a written notice of any proposed or intended
      issuance, sale or exchange of Company Equity Securities containing the
      information specified in Subsection 5.1.

            "Notice of Proposed Transfer" means a written notice from Centene
      indicating its desire to Transfer any of the Initial Company Shares, or
      any interest in the Initial Company Shares, in any transaction pursuant to
      Subsection 4.1.

            "Offered Company Shares" means any Initial Company Shares that
      Centene proposes to Transfer, as indicated in a Notice of Proposed
      Transfer.

            "Offeror" means the party to which Centene proposes to Transfer any
      Offered Company Shares or any interest in any Offered Company Shares.

            "Option Period" means the period described in paragraph (a) of
      Subsection 4.2.

            "Other Holders" means holders of securities of Centene, other than
      the University, that are entitled, by contract with Centene, to have
      securities included in a Registration Statement.

            "Prospectus" means the prospectus included in any Registration
      Statement, as amended or supplemented by an amendment or prospectus
      supplement, including post-effective amendments, and all material
      incorporated by reference or deemed to be incorporated by reference in
      such Prospectus.

            "Reasonable Best Efforts" means best efforts, to the extent
      commercially reasonable.

            "Refused Securities" means those Company Equity Securities as to
      which a Notice of Acceptance has not been given by the University or
      Centene pursuant to Subsection 5.2.

            "Registration Statement" means a registration statement filed by
      Centene with the Commission for a public offering and sale of securities
      of Centene, other than a registration statement on Form S-8 or Form S-4,
      or their successor forms, or any other form for a similar limited purpose.

            "Registration Expenses" means all expenses incurred by Centene in
      complying with the provisions of Section 7, including (a) registration and
      filing fees, (b) fees of each securities exchange or automated quotation
      system on which the Centene Common is listed or quoted, (c) printing
      expenses, (d) fees and expenses of counsel for Centene, (e) fees and
      expenses of one counsel selected by the University to represent the
      University, up to a maximum of $10,000, (f) securities or Blue Sky fees
      and expenses of any state or province and (g) costs of any special audits
      incident to or required by any registration, but excluding underwriting
      discounts and selling commissions.

            "Registrable Shares" means (a) the Centene Shares, if any, issued to
      the University in the Exchange and (b) any other Centene Shares issued in
      respect of such shares (because of stock splits, stock dividends,
      reclassifications, recapitalizations or similar events), provided that any
      Centene Shares that are Registrable Shares shall cease to be Registrable
      Shares (i) upon any Transfer to a person or entity that is not entitled,
      pursuant to Subsection 10.3, to the rights under this Agreement or (ii) at
      such time as all of the Registrable Shares may be sold within a
      three-month period pursuant to Rule 144.


                                       3


            "Responsible Party" means Centene, to the extent obligated to
      provide indemnification pursuant to paragraph (a) of Subsection 7.4, and
      the University, to the extent obligated to make payments pursuant to
      paragraph (b) of Subsection 7.4.

            "Securities Act" means the Securities Act of 1933, as amended.

            "Transfer" means a sale, transfer or other disposition, whether
      voluntarily or by operation of law.

            "Undersubscription Amount" means, with respect to the University or
      Centene, any additional portion of the Company Equity Securities
      attributable to the Basic Amount of such other party as the University or
      Centene indicates it will purchase or acquire should such other party
      subscribe for less than its Basic Amount.

2.    Voting of Company Shares

      2.1. Voting Regarding Directors. In any and all elections of directors of
the Company (whether at a meeting or by written consent in lieu of a meeting),
each of the University and Centene shall vote or cause to be voted all Company
Shares owned by it, or over which it has voting control, and otherwise use its
respective Reasonable Best Efforts, so as to fix the number of directors of the
Company at eight and to elect (a) six members designated by Centene and (b) two
members designated by the University. Two of the directors initially designated
by Centene are Alexander H. McLean and Michael F. Neidorff, and Centene shall
provide the names of the remaining four designees to the University by December
1, 2002 or as soon thereafter as practicable. The University shall provide to
Centene the names of its two initial designees by December 1, 2002 or as soon
thereafter as practicable.

      2.2. Limitation on Removal of Directors. Neither the University nor
Centene shall vote to remove any director of the Company designated by the other
pursuant to Subsection 2.1 unless (a) it is instructed to do so by such other
party or (b) the director acts in bad faith or commits willful misconduct.

      2.3. Limitation on Amendments of Rights. The voting rights of the
University and Centene contained in this Section 2 are coupled with an interest
and may not be revoked, except by an amendment or modification effected in
accordance with paragraph (b) of Subsection 10.4.

      2.4. Transfers of Rights. Any person or entity to which Company Shares are
transferred by the University or Centene, whether voluntarily or by operation of
law, shall be bound by the voting obligations imposed upon the transferor under
this Agreement, to the same extent as if such transferee were the University or
Centene; and no transfer of any Company Shares shall be given effect unless the
transferee provides a written instrument to the Company notifying the Company of
such transfer and agreeing in writing to be bound by the terms of this
Agreement.

      2.5. Legend. All certificates representing Company Shares owned or
hereafter acquired by the University and Centene or any transferee of any such
party bound by this Agreement shall have affixed thereto a legend substantially
in the following form:

            "The shares of stock represented by this certificate are subject to
            certain voting agreements as set forth in an Investor Rights
            Agreement, a copy of which is available for inspection at the
            offices of the Secretary of the Company."


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3.    Restrictions on Transfers of Company Shares

      3.1. Restriction. Any Transfer of any Initial Company Shares by Centene or
of any Additional Company Shares by the University, other than according to the
terms of this Agreement, shall be void and transfer no right, title, or interest
in or to any of such Initial Company Shares to the purported transferee.

      3.2. Legend. Any certificate representing Company Shares held by the
University or Centene shall bear in a prominent manner the following legend:

            "The sale or other disposition of any of the shares represented by
            this certificate is restricted by an Investor Rights Agreement dated
            as of December 1, 2002, a copy of which is available for inspection
            during normal business hours at the principal executive office of
            this corporation."

      3.3. Constructive Trust. The proceeds of any sale made by the University
or Centene without compliance with the provisions of this Section 3 shall be
deemed to be held in constructive trust in such amount as would have been due to
the other party if the University or Centene, as the case may be, had complied
with this Agreement.

      3.4. Loan Agreement. The University acknowledges that Centene is required
to pledge to LaSalle Bank National Association ("LaSalle") any Company Shares
acquired by Centene, pursuant to the terms of a Loan Agreement dated as of May
1, 2002 between Centene and LaSalle. The University further acknowledges that
(a) such pledge (and any pledge required by any successor loan agreement to
which Centene is a party) does not constitute a Transfer for purposes of this
Agreement and (b) subject to compliance with the second and third sentences of
Subsection 10.3, the transfer of any pledged Company Shares to a lender upon a
realization event with respect to such pledged Company Shares shall constitute a
permitted Transfer for purposes of this Agreement, notwithstanding anything
herein to the contrary.

4.    Permitted Transfers of Initial Company Shares

      4.1. Notice of Proposed Transfer. If Centene desires to Transfer any of
the Initial Company Shares, or any interest in such Initial Company Shares, in
any transaction, Centene shall first deliver to the University a Notice of
Proposed Transfer as to its desire to do so, in the manner prescribed in
Subsection 10.2. The Notice of Proposed Transfer must specify: (a) the name and
address of the Offeror; (b) the number of Offered Company Shares; (c) the
consideration per Offered Company Share to be delivered to Centene for the
proposed Transfer; and (d) all other material terms and conditions of the
proposed Transfer.

      4.2. University's Option to Purchase

            (a) Subject to Subsection 4.3, the University shall have the first
      option to purchase all, but not less than all, of the Offered Company
      Shares for the consideration per Initial Company Share and on the terms
      and conditions specified in the Notice of Proposed Transfer. The
      University must give written notice to Centene, in the manner set forth in
      Subsection 10.2, of its intent to exercise such option by no later than 15
      days after the Notice of Proposed Transfer is deemed under Subsection 10.2
      to have been delivered to it.

            (b) In the event the University duly notifies Centene of its intent
      to exercise its option to purchase all of the Offered Company Shares, the
      closing of such purchase shall take place at the offices of Centene on the
      date five business days after the expiration of such 15-day period,


                                       5


      or on such other date as may be mutually agreed upon in writing by the
      University and Centene.

      4.3. Failure to Exercise Option; Co-Sale

            (a) If the University does not exercise its option to purchase all
      of the Offered Company Shares within the Option Period, then the option of
      the University to purchase the Offered Company Shares arising as a result
      of the Notice of Proposed Transfer set forth in Subsection 4.1 shall
      terminate, but the University shall be entitled to sell the Additional
      Company Shares in the transaction pursuant to Subsection 4.1 and shall
      continue to have the rights set forth in Subsections 4.2 and 4.3 with
      regard to any subsequent proposed Transfers of Offered Company Shares. In
      such event, Centene shall use its Reasonable Best Efforts to interest the
      Offeror in purchasing, in addition to the Offered Company Shares, the
      Additional Company Shares the University wishes to sell. If the Offeror
      does not wish to purchase all of the Company Shares made available by the
      University and Centene, then the University and Centene shall be entitled
      to sell, at the price and on the terms and conditions set forth in the
      Notice of Proposed Transfer, a portion of the Company Shares being sold to
      the Offeror, in the same proportion as the respective numbers of Company
      Shares owned by them bears to the aggregate number of Company Shares
      outstanding. The transaction contemplated by the Notice of Proposed
      Transfer shall be consummated not later than 60 days after the expiration
      of the Option Period.

            (b) If the University does not elect to sell the full number of
      Additional Company Shares that it is entitled to sell pursuant to
      paragraph (a) of Subsection 4.3, Centene shall be entitled to sell to the
      Offeror, according to the terms set forth in the Notice of Proposed
      Transfer, that number of its Initial Company Shares that equals the
      difference between the number of Company Shares desired to be purchased by
      the Offeror and the number of Additional Company Shares that the
      University is entitled to sell pursuant to paragraph (a) of Subsection
      4.3. If Centene wishes to Transfer any such Initial Company Shares at a
      price per Initial Company Share that differs from that set forth in the
      Notice of Proposed Transfer, upon terms different from those previously
      offered to the University, or more than 60 days after the expiration of
      the Option Period, then, as a condition precedent to such transaction,
      such Initial Company Shares must first be offered to the University on the
      same terms and conditions as given the Offeror, and in accordance with the
      procedures and time periods set forth above, including the opportunity for
      the University to elect to sell all or part of its Additional Company
      Shares in such revised sale transaction.

      4.4. Calculation of Share Numbers. In determining the number of Company
Shares owned by a party for purposes of exercising rights under this Section 4,
all Company Shares held by Affiliates of such party shall be aggregated
together, provided that no shares shall be attributed to more than one entity or
person within any such group of affiliated entities or persons.

      4.5. Limitation. The provisions of Subsections 4.1, 4.2 and 4.3 shall not
apply to any sale of Company Shares pursuant to a Company Sale to the extent
that the nature, and fair market value per Company Share, of the consideration
deliverable or payable to the University and Centene, in their capacities as
holders of Company Common, are, in all respects, identical.

5.    Right of First Refusal Regarding Company Equity Securities

      5.1. Notice of Offer. The Company shall not issue, sell or exchange, agree
to issue, sell or exchange, or reserve or set aside for issuance, sale or
exchange, any Company Equity Securities, unless in each such case the Company
shall have first complied with this Section 5. The Company shall deliver to each
of the University and Centene a Notice of Offer, which shall (a) identify and


                                       6


describe the Company Equity Securities, (b) describe the price and other terms
upon which they are to be issued, sold or exchanged, and the number or amount of
the Company Equity Securities to be issued, sold or exchanged, (c) identify the
persons or entities (if known) to which or with which the Company Equity
Securities are to be offered, issued, sold or exchanged, and (d) offer to issue
and sell to or exchange with the University and Centene such party's Basic
Amount and Undersubscription Amount.

      5.2. Notice of Acceptance. To accept a Notice of Offer in whole or in
part, the University or Centene must deliver to the Company, on or prior to the
date five business days after the date of delivery of the Notice of Offer, a
Notice of Acceptance providing a representation letter certifying that such
party is an accredited investor within the meaning of Rule 501 under the
Securities Act and indicating the portion of such party's Basic Amount that such
party elects to purchase and, if such party shall elect to purchase all of its
Basic Amount, the Undersubscription Amount (if any) that such party elects to
purchase. If the University or Centene has set forth an Undersubscription Amount
in its Notice of Acceptance, and if such other party subscribes for less than
its Basic Amount, the University or Centene shall be entitled to purchase, in
addition to its Basic Amount, the Undersubscription Amount that is available and
for which it has subscribed.

      5.3. Sale of Refused Securities. The Company shall have 30 days from the
expiration of the period set forth in Subsection 5.2 to issue, sell or exchange
all or any part of the Refused Securities, but only to the offerees or
purchasers described in the Notice of Offer (if so described therein) and only
upon terms and conditions (including unit prices and interest rates) that are
not more favorable, in the aggregate, to the acquiring person or persons or less
favorable to the Company than those set forth in the Notice of Offer. In the
event the Company shall propose to sell less than all the Refused Securities,
then each of the University and Centene may, at its sole option and in its sole
discretion, reduce the number or amount of the Company Equity Securities
specified in its Notice of Acceptance to an amount that shall be not less than
the number or amount of the Company Equity Securities that such party elected to
purchase pursuant to Subsection 5.2 multiplied by a fraction, (a) the numerator
of which shall be the number or amount of Company Equity Securities the Company
actually proposes to issue, sell or exchange (including Company Equity
Securities to be issued or sold to the University and Centene pursuant to
Subsection 5.2 prior to such reduction) and (b) the denominator of which shall
be the original amount of the Company Equity Securities. In the event that the
University or Centene so elects to reduce the number or amount of Company Equity
Securities specified in its Notice of Acceptance, the Company may not issue,
sell or exchange more than the reduced number or amount of the Company Equity
Securities unless and until such securities have again been offered to the
University and Centene in accordance with Subsection 5.1.

      5.4. Issuance of Company Equity Securities. Upon (a) the closing of the
issuance, sale or exchange of all or less than all of the Refused Securities or
(b) such other date agreed to by the Company and the purchaser or purchasers who
have subscribed for a majority of the Company Equity Securities, such purchaser
or purchasers shall acquire from the Company, and the Company shall issue to
such purchaser or purchasers, the number or amount of Company Equity Securities
specified in the Notice of Acceptance, as reduced pursuant to Subsection 5.3 if
any of the University or Centene have so elected, upon the terms and conditions
specified in the Notice of Offer.

      5.5. Negotiation of Stock Purchase Agreement. The purchase by Centene or
University of any Company Equity Securities is subject in all cases to the
preparation, execution and delivery by the Company and Centene and/or the
University of a stock purchase agreement relating to such Company Equity
Securities reasonably satisfactory in form and substance to Centene and/or the
University and their respective counsel.


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      5.6. Subsequent Offers. Any Company Equity Securities not acquired by the
University or Centene or other persons in accordance with Subsection 5.3 may not
be issued, sold or exchanged until they are again offered to the University and
Centene under the procedures specified in this Agreement.

      5.7. Exceptions to Right of First Refusal. The rights of the University
and Centene under this Section 5 shall not apply to:

            (a) the issuance of any shares of Company Common as a stock dividend
      to holders of Company Common or upon any subdivision or combination of
      shares of Company Common;

            (b) the issuance of any shares of Company Common upon conversion of
      shares of convertible preferred stock of the Company;

            (c) the issuance of Company Equity Securities solely in
      consideration for the acquisition (whether by merger or otherwise) by the
      Company or any of its subsidiaries of all or substantially all of the
      stock or assets of any other entity;

            (d) the issuance of shares of Company Common by the Company in a
      firm-commitment underwritten public offering pursuant to an effective
      registration statement under the Securities Act; or

            (e) the issuance of shares of Company Common, or the grant of
      warrants therefor, in connection with any present or future borrowing,
      line of credit, leasing or similar financing arrangement approved by the
      Board of Directors of the Company.

6.    Exchange of Additional Company Shares for Centene Shares

      6.1. Terms of the Exchange. Subject to and upon the terms and conditions
of this Section 6, on the Exchange Date the University shall transfer, convey,
assign and deliver the Additional Company Shares (which term for purposes of
this Section 6 shall exclude any Additional Company Shares previously
transferred in accordance with the terms of this Agreement, but shall include
any Additional Company Shares then held by Affiliates of the University) to
Centene, and Centene shall acquire and accept the Additional Company Shares from
the University. On the Exchange Date, the University shall deliver to Centene a
certificate evidencing the Additional Company Shares, duly endorsed in blank or
with a stock power duly executed by the University. This Section 6 shall not
apply in the event Centene exercises the option provided in Subsection 8.1.

      6.2. Consideration for the Additional Company Shares. In consideration for
the transfer of the Additional Company shares by the University, Centene shall
deliver to the University on the Exchange Date either, at Centene's option, (a)
a number of Centene Shares equal to the Deemed Value (as defined in this
Subsection 6.2) divided by the average of the daily volume weighted average
trading price (the total dollar amount traded on each day divided by trading
volume for such day) of the Centene Common for the twenty Trading Days
immediately preceding the Exchange Date, as reported at 4:15 (New York time) on
the Exchange Date as reported by Bloomberg, LP function key HP by using W to
calculate the daily weighted average or (b) cash in the amount of the Deemed
Value. For these purposes, "Trading Day" shall mean (i) any day on which the
Centene Common is traded on the Nasdaq National Market, or (ii) if the Centene
Common is not then listed or quoted on any national securities exchange, market
or trading or quotation facility, then a day on which trading occurs on the New
York Stock Exchange (or any successor thereto). For these purposes, the "Deemed
Value" of the Additional Company Shares shall mean an amount equal to the
greater of:


                                       8


                  (i)   an amount equal to 25 percent of the Purchase Price (as
                        defined in the Purchase Agreement), without giving
                        effect to any reduction or adjustment thereto applicable
                        under the terms of the Purchase Agreement, and

                  (ii)  the enterprise value of the Company as of the Exchange
                        Date, as established by the mutual agreement of the
                        University and Centene (or, in the absence of such
                        agreement, an investment bank or other appraisal firm
                        mutually satisfactory to the University and Centene)
                        multiplied by the percentage of the outstanding Company
                        Common (on a fully diluted basis) represented by the
                        Additional Company Shares.

      6.3. Representations and Covenants of the University. The University
represents and warrants to, and agrees with, Centene as follows:

            (a) The University has, and will have on the Option Closing Date or
      the Exchange Date (as the case may be), all requisite power and authority
      (corporate and other) to transfer, convey and sell the Additional Company
      Shares to Centene in the Exchange. Execution and delivery by the
      University of this Agreement, and the consummation by the University of
      all transactions contemplated hereunder, have been duly authorized by all
      requisite corporate or other action. This Agreement has been duly executed
      by the University. This Agreement constitutes the valid and binding
      obligations of the University, enforceable against the University in
      accordance with its terms. The execution and delivery by the University of
      this Agreement and the consummation by the University of the transactions
      contemplated hereby do not, and will not on the Option Closing Date or the
      Exchange Date (as the case may be), (i) conflict with or violate the
      provisions of any law, rule or regulation applicable to the University or
      any of its properties or assets, (b) conflict with or violate the
      provisions of the charter documents of the University, (c) require on the
      part of the University any notice to or filing with, or any permit,
      authorization, consent or approval of, any Governmental Entity (as defined
      in the Purchase Agreement), (d) violate any judgment, decree, order or
      award of any court, governmental body or arbitrator by which the
      University or its properties, including the Additional Company Shares, are
      bound, (e) conflict with, result in breach of, constitute (with or without
      due notice or lapse of time or both) a default under, result in the
      acceleration of obligations under, create in any party any right to
      terminate, modify or cancel, or require any notice, consent or waiver
      under, any contract or instrument to which the University is a party or by
      which it is bound or to which any of its assets, including the Additional
      Company Shares, are subject or (f) result in the creation of any lien,
      security interest, restriction or other encumbrance on the Additional
      Company Shares.

            (b) The University has, and will have on the Option Closing Date or
      the Exchange Date (as the case may be), good, valid and marketable title
      to the Additional Company Shares, free and clear of any and all covenants,
      conditions, restrictions, voting trust arrangements, liens, charges,
      encumbrances, options and adverse claims or rights whatsoever. Upon
      consummation of the Exchange, Centene will acquire from the University
      good and marketable title to the Additional Company Shares, free and clear
      of all covenants, conditions, restrictions, voting trust arrangements,
      liens, charges, encumbrances, options and adverse claims or rights
      whatsoever.

            (c) To the extent that Centene issues or proposes to issue any
      Centene Shares pursuant to Subsection 6.2, the University is, and will be
      on the Exchange Date, acquiring such Centene Shares for the University's
      own account for investment only and not with a view to, or for sale in
      connection with, any distribution of the Centene Shares in violation of
      the Securities Act or any rule or regulation thereunder. The University
      does not have, and will not have on the


                                       9


      Exchange Date, any intention of distributing or selling the Centene
      Shares, and the University does not have, and will not have on the
      Exchange Date, any agreement, undertaking, arrangement, obligation,
      indebtedness or commitment, whether existing or contemplated, providing
      for the disposition of the Centene Shares. The University is, and will be
      on the Exchange Date, an "accredited investor" within the meaning of Rule
      501(a) under the Securities Act. The University has had, and will have had
      on the Exchange Date, adequate opportunity to obtain from representatives
      of Centene such information about Centene as is necessary for the
      University to evaluate the merits and risks of the University's
      acquisition of the Centene Shares pursuant to this Agreement. The
      University has, and will have on the Exchange Date, sufficient expertise
      in business and financial matters to be able to evaluate the risks
      involved in the acquisition of the Centene Shares pursuant to the
      Agreement and to make an informed investment decision with respect to such
      acquisition. The University understands that the Centene Shares (i) have
      not been, and will not be on the Exchange Date, registered under the
      Securities Act and are, and will be on the Exchange Date, "restricted
      securities" within the meaning of Rule 144 under the Securities Act, (ii)
      cannot be sold, transferred or otherwise disposed of unless they are
      subsequently registered under the Securities Act or an exemption from
      registration is then available, and (iii) will be represented by a
      certificate or certificates bearing a legend substantially in the
      following form:

                  "The shares represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, and
                  may not be sold, transferred or otherwise disposed of in the
                  absence of an effective registration statement under such Act
                  or an opinion of counsel satisfactory to the corporation to
                  the effect that such registration is not required."

            (d) At any time and from time to time after the Option Closing Date
      or the Exchange Date (as the case may be), at Centene's request and
      without further consideration, the University shall promptly execute and
      deliver, or cause to be executed and delivered, such consents and
      instruments of transfer, conveyance, assignment and confirmation, and take
      all such other action as Centene may reasonably request, to implement and
      carry out the purpose of any provision of this Agreement or to more
      effectively transfer, convey and assign to Centene good and marketable
      title to, the right to validly and lawfully hold, and to put Centene in
      actual possession of, the Additional Company Shares free and clear of all
      liens, charges, encumbrances, options and adverse claims or rights
      whatsoever.

            (e) To the extent Centene Shares are issued in the Exchange, all
      sales of those shares shall be effected through a brokerage firm acting as
      a market maker for Centene Common or such other broker-dealer as shall be
      agreed upon by Centene (which agreement shall not be unreasonably
      withheld).

      6.4. Representations of Centene. Centene represents and warrants to the
University as follows:

            (a) Centene has full power to execute and deliver this Agreement to
      consummate the transactions contemplated hereby. The execution and
      delivery of this Agreement by Centene and the consummation by Centene of
      the transactions contemplated hereby have been duly authorized by all
      requisite corporate action. This Agreement constitutes the valid and
      binding obligations of Centene, enforceable against Centene in accordance
      with its terms. The execution and delivery by Centene of this Agreement
      and the consummation by Centene of the transactions contemplated hereby do
      not, and will not on the Option Closing Date or the Exchange Date (as the
      case may be), (a) conflict with or violate the provisions of any law, rule


                                       10


      or regulation applicable to Centene; (b) conflict with or violate the
      provisions of Centene's Certificate of Incorporation or Bylaws; (c)
      require on the part of Centene any notice to or filing with, or permit,
      authorization, consent or approval of, any Governmental Entity, (d)
      violate any judgment, decree, order or award of any court, governmental
      body or arbitrator by which Centene or its properties are bound, or (e)
      conflict with, result in breach of, constitute (with or without due notice
      or lapse of time or both) a default under, result in the acceleration of
      obligations under, create in any party any right to terminate, modify or
      cancel, or require any notice, consent or waiver under, any contract or
      instrument to which Centene is a party or by which it is bound or to which
      any of its assets are subject, except in any such case for (i) compliance
      with applicable requirements of the Securities Act, any applicable state
      securities laws and the Exchange Act and (ii) approval of the State of New
      Jersey Department of Banking and Insurance and the New Jersey Department
      of Human Services, Division of Medical Assistance and Health Services of
      the transactions contemplated hereby.

            (b) Centene is, and will be on the Option Closing Date or the
      Exchange Date (as the case may be), acquiring the Additional Company
      Shares from the University for Centene's own account for investment only
      and not with a view to, or for sale in connection with, any distribution
      of the Additional Company Shares in violation of the Securities Act or any
      rule or regulation thereunder. Centene does not have, and will not have on
      the Option Closing Date or the Exchange Date (as the case may be), any
      intention of distributing or selling the Additional Company Shares, and
      Centene does not have, and will not have on the Option Closing Date or the
      Exchange Date (as the case may be), any agreement, undertaking,
      arrangement, obligation, indebtedness or commitment, whether existing or
      contemplated, providing for the disposition of the Additional Company
      Shares. Centene is, and will be on the Option Closing Date or the Exchange
      Date (as the case may be), an "accredited investor" within the meaning of
      Rule 501(a) under the Securities Act. Centene has had, and will have had
      on the Option Closing Date or the Exchange Date (as the case may be),
      adequate opportunity to obtain from representatives of the University and
      the Company such information about the Company as is necessary for Centene
      to evaluate the merits and risks of Centene's acquisition of the
      Additional Company Shares pursuant to this Agreement. Centene has, and
      will have on the Option Closing Date or the Exchange Date (as the case may
      be), sufficient expertise in business and financial matters to be able to
      evaluate the risks involved in the acquisition of the Additional Company
      Shares pursuant to the Agreement and to make an informed investment
      decision with respect to such acquisition. Centene understands that the
      Additional Company Shares (i) have not been, and will not be on the Option
      Closing Date or the Exchange Date (as the case may be), registered under
      the Securities Act and are, and will be on the Option Closing Date or the
      Exchange Date (as the case may be), "restricted securities" within the
      meaning of Rule 144 under the Securities Act, (ii) cannot be sold,
      transferred or otherwise disposed of unless they are subsequently
      registered under the Securities Act or an exemption from registration is
      then available and (iii) will be represented by a certificate or
      certificates bearing a legend substantially in the following form:

                  "The shares represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, and
                  may not be sold, transferred or otherwise disposed of in the
                  absence of an effective registration statement under such Act
                  or an opinion of counsel satisfactory to the corporation to
                  the effect that such registration is not required."

            (c) To the extent that Centene issues or proposes to issue any
      Centene Shares pursuant to Subsection 6.2, the issuance and delivery of
      such Centene Shares will be, prior to the


                                       11


      Exchange, duly authorized by all necessary corporate action on the part of
      Centene. The Centene Shares, when so issued, will be duly and validly
      issued, fully paid and nonassessable.

            (d) Centene has previously furnished or made available to the
      University complete and accurate copies, as amended or supplemented, of
      (i) its Annual Report on Form 10-K for the fiscal year ended December 31,
      2001, as filed with the Commission and (ii) all other reports filed by
      Centene under Section 13 or subsections (a) or (c) of Section 14 of the
      Exchange Act with the Commission since January 1, 2002 (such reports are
      collectively referred to herein as the "Centene Reports"). The Centene
      Reports constitute all of the documents required to be filed by Centene
      with the Commission under Section 13 or subsections (a) or (c) of Section
      14 of the Exchange Act from January 1, 2002 through the date of this
      Agreement. The Centene Reports complied in all material respects with the
      requirements of the Exchange Act and the rules and regulations thereunder
      when filed. As of their respective dates, the Centene Reports did not
      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 financial statements and unaudited
      interim financial statements of Centene included in the Centene Reports
      (i) complied as to form in all material respects with applicable
      accounting requirements and the published rules and regulations of the
      Commission with respect thereto when filed, (ii) were prepared in
      accordance with United States generally accepted accounting principles
      applied on a consistent basis throughout the periods covered thereby
      (except as may be indicated therein or in the notes thereto, and in the
      case of quarterly financial statements, as permitted by Form 10-Q under
      the Exchange Act), (iii) fairly present the consolidated financial
      condition, results of operations and cash flows of Centene as of the
      respective dates thereof and for the periods referred to therein, and (iv)
      are consistent with the books and records of Centene.

            (e) Since June 30, 2002, there has occurred no event or development
      that has had, or could reasonably be expected to have in the future, a
      material adverse change, event, circumstance or development with respect
      to, or material adverse effect on, the business, assets, liabilities,
      capitalization, prospects, condition (financial or other), or results of
      operations of Centene and its subsidiaries, taken as a whole.

7.    Registration Rights Regarding Centene Shares

      7.1. Incidental Registration

            (a) Whenever Centene proposes to file a Registration Statement
      covering Centene Shares at any time and from time to time after the
      Exchange Date, it will, prior to such filing, give written notice to the
      University of its intention to do so, provided that no such notice need be
      given if no Registrable Shares are to be included therein as a result of a
      written notice from the managing underwriter pursuant to paragraph (b) of
      this Subsection 7.1.

            (b) Whenever Centene proposes to file a Registration Statement
      covering Centene Shares (other than a Registration Statement covering
      Centene Shares to be sold solely for the account of Other Holders, which
      Centene Shares were acquired, or are acquirable, pursuant to (i) an
      acquisition of a company of which the Other Holders were formerly
      stockholders, (ii) a "private investment, public equity" financing or
      (iii) Rule 144A under the Securities Act) to be offered at any time and
      from time to time after the Exchange Date, it will, prior to such filing,
      give written notice to the University of its intention to do so, provided
      that no such notice need be given if no Registrable Shares are to be
      included therein as a result of a written notice from a managing
      underwriter pursuant to paragraph (b) of this Subsection 7.1. Upon the
      written request of the University given within five business days after
      Centene provides such notice, Centene shall use its Reasonable Best
      Efforts to cause all Registrable Shares that Centene has


                                       12


      been requested by the University to register to be registered under the
      Securities Act to the extent necessary to permit their sale or other
      disposition in accordance with the intended methods of distribution
      specified in the request of the University, provided that Centene shall
      have the right to postpone or withdraw any registration effected pursuant
      to this Subsection 7.1 without obligation to the University.

            (c) If the registration for which Centene gives notice pursuant to
      paragraph (a) of this Subsection 7.1 is a registered public offering
      involving an underwriting, Centene shall so advise the University as a
      part of the written notice given pursuant to paragraph (a) of this
      Subsection 7.1. In such event, (i) the right of the University to include
      its Registrable Shares in such registration pursuant to this Subsection
      7.1 shall be conditioned upon the University's participation in such
      underwriting on the terms set forth herein and (ii) the University's
      entering into an underwriting agreement, including terms of
      indemnification, upon customary terms with the underwriter or underwriters
      selected for the underwriting by Centene, as may be modified by the
      University and the underwriters with respect to indemnification. If the
      University disapproves of the terms of the underwriting, the University
      may elect, by written notice to Centene, to withdraw its shares from
      inclusion in such Registration Statement. If the managing underwriter
      advises Centene in writing that marketing factors require a limitation on
      the number of shares to be underwritten, the shares held by holders other
      than the University and Other Holders shall be excluded from such
      Registration Statement to the extent deemed advisable by the managing
      underwriter, and, if a further reduction of the number of shares is
      required, the number of shares that may be included in such Registration
      Statement and underwriting shall be allocated among the University and
      Other Holders requesting registration in proportion, as nearly as
      practicable, to the respective number of shares of Centene Shares held by
      them on the date Centene gives the notice specified in paragraph (a) of
      this Subsection 7.1. If the University or any Other Holder would thus be
      entitled to include more shares than such holder requested to be
      registered, the excess shall be allocated among the University and Other
      Holders pro rata in the manner described in the preceding sentence.

      7.2. Registration Procedures

            (a) If and whenever Centene is required by the provisions of this
      Agreement to use its Reasonable Best Efforts to effect the registration of
      any Registrable Shares under the Securities Act, Centene shall:

                  (i)   file with the Commission a Registration Statement with
                        respect to such Registrable Shares and use its
                        Reasonable Best Efforts to cause that Registration
                        Statement to become effective as soon as possible;

                  (ii)  as expeditiously as possible prepare and file with the
                        Commission any amendments and supplements to the
                        Registration Statement and the prospectus included in
                        the Registration Statement as may be necessary to comply
                        with the provisions of the Securities Act (including the
                        anti-fraud provisions thereof) and to keep the
                        Registration Statement effective for such period as
                        Centene may agree or determine;

                  (iii) as expeditiously as possible furnish to the University
                        such reasonable numbers of copies of the Prospectus,
                        including any preliminary Prospectus, in conformity with
                        the requirements of the Securities Act, and such other
                        documents as the University may reasonably request in
                        order to facilitate the public sale or other disposition
                        of the Registrable Shares owned by the University;


                                       13


                  (iv)  as expeditiously as possible use its Reasonable Best
                        Efforts to register or qualify the Registrable Shares
                        covered by the Registration Statement under the
                        securities or Blue Sky laws of such states as the
                        University shall reasonably request, and do any and all
                        other acts and things that may be necessary or desirable
                        to enable the University to consummate the public sale
                        or other disposition in such states of the Registrable
                        Shares owned by the University, provided that Centene
                        shall not be required in connection with this clause
                        (iv) to qualify as a foreign corporation or execute a
                        general consent to service of process in any
                        jurisdiction;

                  (v)   as expeditiously as possible, cause all such Registrable
                        Shares to be listed on each securities exchange or
                        automated quotation system on which similar securities
                        issued by Centene are then listed;

                  (vi)  promptly make available for inspection by the
                        University, any managing underwriter participating in
                        any disposition pursuant to such Registration Statement,
                        and any attorney or accountant or other agent retained
                        by any such underwriter or selected by the University,
                        all financial and other records, pertinent corporate
                        documents and properties of Centene and cause Centene's
                        officers, directors, employees and independent
                        accountants to supply all information reasonably
                        requested by any such seller, underwriter, attorney,
                        accountant or agent in connection with such Registration
                        Statement;

                  (vii) notify the University, promptly after it shall receive
                        notice thereof, of the time when such Registration
                        Statement has become effective or a supplement to any
                        Prospectus forming a part of such Registration Statement
                        has been filed; and

                  (viii) as expeditiously as possible following the
                        effectiveness of such Registration Statement, notify the
                        University of any request by the Commission for the
                        amending or supplementing of such Registration Statement
                        or Prospectus.

            (b) If Centene has delivered a Prospectus to the University and,
      after having done so, the Prospectus is amended to comply with the
      requirements of the Securities Act, Centene shall promptly notify the
      University and, if requested, the University shall immediately cease
      making offers of Registrable Shares and return all Prospectuses to
      Centene. Centene shall promptly provide the University with revised
      Prospectuses and, following receipt of the revised Prospectuses, the
      University shall be free to resume making offers of the Registrable
      Shares.

            (c) In the event that, in the judgment of Centene, it is advisable
      to suspend use of a Prospectus included in a Registration Statement due to
      pending material developments or other events that have not yet been
      publicly disclosed and as to which Centene believes public disclosure
      would be detrimental to Centene, Centene shall notify the University to
      such effect, and, upon receipt of such notice, the University shall
      immediately discontinue any sales of Registrable Shares pursuant to such
      Registration Statement until the University has received copies of a
      supplemented or amended Prospectus or until the University is advised in
      writing by Centene that the then current Prospectus may be used and has
      received copies of any additional or supplemental filings that are
      incorporated or deemed incorporated by reference in such Prospectus.

      7.3. Allocation of Expenses. Centene will pay, or cause to be paid, all
Registration Expenses incurred by or on behalf of Centene or the University for
all registrations pursuant to Subsection 7.1.


                                       14


      7.4. Indemnification, Payments and Contribution

            (a) In the event of any registration of any of the Registrable
      Shares under the Securities Act pursuant to this Agreement, Centene will
      indemnify and hold harmless the University, each underwriter of such
      Registrable Shares, and each other person, if any, who controls the
      University or such underwriter within the meaning of the Securities Act or
      the Exchange Act against any losses, claims, damages or liabilities, joint
      or several, to which the University and such underwriter or controlling
      person may become subject under the Securities Act, the Exchange Act,
      state securities or Blue Sky laws or otherwise, insofar as such losses,
      claims, damages or liabilities (or actions in respect thereof) arise out
      of or are based upon (i) any untrue statement or alleged untrue statement
      of any material fact contained in any Registration Statement under which
      such Registrable Shares were registered under the Securities Act, any
      preliminary prospectus or final prospectus contained in the Registration
      Statement, or any amendment or supplement to such Registration Statement,
      (ii) the omission or alleged omission to state a material fact required to
      be stated therein or necessary to make the statements therein not
      misleading, or (iii) any violation or alleged violation by Centene of the
      Securities Act, the Exchange Act, any state securities law or any rule or
      regulation promulgated under the Securities Act, the Exchange Act or any
      state securities law in connection with the Registration Statement or the
      offering contemplated thereby. Centene will reimburse the University, such
      underwriter and each such controlling person for any legal or any other
      expenses reasonably incurred by the University and such underwriter or
      controlling person in connection with investigating or defending any such
      loss, claim, damage, liability or action, provided that Centene will not
      be liable in any such case to the extent that any such loss, claim, damage
      or liability arises out of or is based upon any untrue statement or
      omission made in such Registration Statement, preliminary prospectus or
      prospectus, or any such amendment or supplement, in reliance upon and in
      conformity with information furnished to Centene, in writing, by or on
      behalf of the University or such underwriter or controlling person
      specifically for use in the preparation thereof.

            (b) In the event of any registration of any of the Registrable
      Shares under the Securities Act pursuant to this Agreement, the University
      will pay to Centene, each of its directors and officers, each underwriter
      (if any) and each person, if any, who controls Centene or any such
      underwriter within the meaning of the Securities Act or the Exchange Act,
      all or a portion of the net proceeds to the University of Registrable
      Shares sold in connection with such registration in the event Centene or
      any such director, officer, underwriter or controlling person incurs,
      suffers or is subject to any losses, claims, damages or liabilities, joint
      or several, under the Securities Act, Exchange Act, state securities or
      Blue Sky laws or otherwise, insofar as such losses, claims, damages or
      liabilities (or actions in respect thereof) arise out of or are based upon
      (i) any untrue statement or alleged untrue statement of a material fact
      contained in any Registration Statement under which such Registrable
      Shares were registered under the Securities Act, any preliminary
      prospectus or final prospectus contained in the Registration Statement, or
      any amendment or supplement to the Registration Statement, or (ii) any
      omission or alleged omission to state a material fact required to be
      stated therein or necessary to make the statements therein not misleading,
      if and to the extent (and only to the extent) that the statement or
      omission was made in reliance upon and in conformity with information
      relating to the University furnished to Centene, in writing, by the
      University specifically for use in connection with the preparation of such
      Registration Statement, prospectus, amendment or supplement. The
      obligations of the University hereunder shall be limited to an amount
      equal to the net proceeds to the University of Registrable Shares sold in
      connection with such registration.


                                       15


            (c) Each Beneficiary Party shall give notice to the Responsible
      Party promptly after such Beneficiary Party has actual knowledge of any
      claim as to which indemnity may be sought from Centene pursuant to
      paragraph (a) of this Subsection 7.4 or as to which payment may be sought
      from the University pursuant to paragraph (b) of this Subsection 7.4, as
      the case may be, and shall permit the Responsible Party to assume the
      defense of any such claim or any litigation resulting therefrom, provided
      that counsel for the Responsible Party, who shall conduct the defense of
      such claim or litigation, shall be approved by the Beneficiary Party
      (whose approval shall not be unreasonably withheld, conditioned or
      delayed), and, provided further that the failure of any Beneficiary Party
      to give notice as provided herein shall not relieve the Responsible Party
      of its obligations under this Subsection 7.4 except to the extent that the
      Responsible Party is adversely affected by such failure. The Beneficiary
      Party may participate in such defense at such party's expense, provided
      that the Responsible Party shall pay such expense if the Beneficiary Party
      reasonably concludes that representation of such Beneficiary Party by the
      counsel retained by the Responsible Party would be inappropriate due to
      actual or potential differing interests between the Beneficiary Party and
      any other party represented by such counsel in such proceeding; provided
      further that in no event shall the Responsible Party be required to pay
      the expenses of more than one law firm per jurisdiction as counsel for the
      Beneficiary Party. The Responsible Party also shall be responsible for the
      expenses of such defense if the Responsible Party does not elect to assume
      such defense. No Responsible Party, in the defense of any such claim or
      litigation shall, except with the consent of each Beneficiary Party,
      consent to entry of any judgment or enter into any settlement that does
      not include as an unconditional term thereof the giving by the claimant or
      plaintiff to such Beneficiary Party of a release from all liability in
      respect of such claim or litigation, and no Beneficiary Party shall
      consent to entry of any judgment or settle such claim or litigation
      without the prior written consent of the Responsible Party, which consent
      shall not be unreasonably withheld, conditioned or delayed.

            (d) In order to provide for just and equitable contribution in
      circumstances in which the indemnification provided for in paragraph (a)
      of this Subsection 7.4 or a payment provided for in paragraph (b) of this
      Subsection 7.4 is due in accordance with its terms but for any reason is
      held to be unavailable to an Beneficiary Party in respect to any losses,
      claims, damages and liabilities referred to herein, then the Responsible
      Party shall, in lieu of indemnifying or paying such Beneficiary Party (as
      the case may be), contribute to the amount paid or payable by such
      Beneficiary Party as a result of such losses, claims, damages or
      liabilities to which such party may be subject in such proportion as is
      appropriate to reflect the relative fault of Centene on the one hand and
      the University on the other in connection with the statements or omissions
      that resulted in such losses, claims, damages or liabilities, as well as
      any other relevant equitable considerations. Any such contribution by the
      University shall be made from the net proceeds to the University of
      Registrable Shares sold in connection with such registration. The relative
      fault of the University and Centene shall be determined by reference to,
      among other things, whether the untrue or alleged untrue statement of
      material fact related to information supplied by the University or Centene
      and the parties' relative intent, knowledge, access to information and
      opportunity to correct or prevent such statement or omission. the
      University and Centene agree that it would not be just and equitable if
      contribution pursuant to this paragraph (d) were determined by pro rata
      allocation or by any other method of allocation that does not take account
      of the equitable considerations referred to above. Notwithstanding the
      provisions of this paragraph (d), (i) in no case shall the University be
      liable or responsible for any amount in excess of the net proceeds
      received by the University from the offering of Registrable Shares and
      (ii) Centene shall be liable and responsible for any amount in excess of
      such proceeds, provided that no person guilty of fraudulent
      misrepresentation (within the meaning of Section 11(f) of the Securities
      Act) shall be entitled to contribution from any person who was not guilty
      of such fraudulent misrepresentation. Any party entitled to


                                       16


      contribution will, promptly after receipt of notice of commencement of any
      action, suit or proceeding against such party in respect of which a claim
      for contribution may be made against another party or parties under this
      paragraph (d), notify such party or parties from whom contribution may be
      sought, but the omission so to notify such party or parties from whom
      contribution may be sought shall not relieve such party from any other
      obligation it or they may have thereunder or otherwise under this
      paragraph (d). No party shall be liable for contribution with respect to
      any action, suit, proceeding or claim settled without its prior written
      consent, which consent shall not be unreasonably withheld, conditioned or
      delayed.

            (e) The rights and obligations of the University and Centene under
      this Subsection 7.4 shall survive the termination of this Agreement.

      7.5. Information from the University. The University shall furnish to
Centene such information regarding the University and the distribution proposed
by the University as Centene may reasonably request in writing and as shall be
required in connection with any registration, qualification or compliance
referred to in this Section 7.

      7.6. "Lock-Up" Agreement; Confidentiality of Notices

            (a) The University, if requested by Centene or the managing
      underwriter of any registered offering of Centene Common at any time at
      which the University holds Registrable Shares, shall not Transfer any
      shares of Centene Common held by the University for a period of 90 days
      following the effective date of the Registration Statement relating to
      such offering, provided that all executive officers and directors of
      Centene enter into similar agreements. Centene may impose stop-transfer
      instructions with respect to any shares of Centene Common subject to the
      foregoing restriction until the end of such 90-day period.

            (b) The University shall treat any written notice from Centene
      regarding Centene's plans to file a Registration Statement as confidential
      and shall not disclose such information to any person other than as
      necessary to exercise its rights under this Agreement.

      7.7. Rule 144 Requirements. Centene agrees to:


            (a) make and keep current public information about Centene
      available, as those terms are understood and defined in Rule 144;

            (b) use its Reasonable Best Efforts to file with the Commission in a
      timely manner all reports and other documents required of Centene under
      the Securities Act and the Exchange Act; and

            (c) furnish to the University upon request (i) a written statement
      by Centene as to its compliance with the reporting requirements of Rule
      144 and the Exchange Act and (ii) such other reports and documents of
      Centene as the University may reasonably request to avail itself of any
      similar rule or regulation of the Commission allowing it to sell any
      Registrable Shares without registration.

8.    Centene's Option to Purchase Additional Company Shares

      8.1. Terms of Purchase. Subject to and upon the terms and conditions of
this Section 8, Centene shall have the option to purchase all, but not less than
all, of the Additional Company Shares from the University for cash consideration
per Additional Company Share equal to 6.25 percent of the Purchase Price (as
defined in the Purchase Agreement), without giving effect to any reduction or
adjustment thereto applicable under the terms of the Purchase Agreement.


                                       17


      8.2. Exercise of Option If Centene desires to exercise the option set
forth in Subsection 8.1, Centene shall deliver to the University a notice as to
its desire to do so, in the manner prescribed in Subsection 10.2. The notice
must specify the date on which such purchase shall be effected (the "Option
Closing Date"), which Option Closing Date shall be a business day occurring (a)
no earlier than 15 days after such notice is deemed under Section 10.2 to have
been delivered to the University and (b) no later than nine months after the
date hereof.

      8.3. Closing. In the event duly Centene notifies the University of its
intent to exercise its option set forth in Subsection 8.1, the closing of the
purchase of the Additional Company Shares shall take place at the offices of
Centene on the Option Closing Date or on such other date as may be mutually
agreed upon in writing by the University and Centene. On the Option Closing Date
the University shall transfer, convey, assign and deliver the Additional Company
Shares (which term for purposes of this Section 8 shall exclude any Additional
Company Shares previously transferred in accordance with the terms of this
Agreement, but shall include any Additional Company Shares then held by
Affiliates of the University) to Centene, and Centene shall acquire and accept
the Additional Company Shares from the University. On the Option Closing Date,
the University shall deliver to Centene a certificate evidencing the Additional
Company Shares, duly endorsed in blank or with a stock power duly executed by
the University.

9.    Covenants

      9.1. Negative Covenants. So long as the University owns five percent or
more of the outstanding Company Common, the Company shall not, without prior
written consent of the University:

            (a)   declare or pay any dividend or make any distribution (other
                  than dividends on Company Common payable solely in Company
                  Common);

            (b)   apply any of its assets to the redemption, retirement,
                  purchase or acquisition, directly or indirectly (including
                  through a Company Subsidiary), or otherwise, of any shares of
                  Company Common;

            (c)   authorize, designate or issue any class of preferred stock of
                  the Company;

            (d)   amend any management agreement between Centene (or any
                  Affiliate of Centene) and the Company;

            (e)   amend or repeal any provision of, or add any provision to, the
                  Company's Certificate of Incorporation or Bylaws; or

            (f)   enter into any agreement with any stockholder, officer or
                  director of the Company, or any Affiliate of any such person,
                  including any agreement or other arrangement providing for the
                  furnishing of services by, rental of real or personal property
                  from, or otherwise requiring payments to, any such person or
                  entity, unless the Board of Directors of the Company has
                  unanimously determined that the terms of such agreement are
                  equivalent to those that would have been determined though
                  arm's-length negotiations with an unrelated person or entity.

      9.2. Limitation on Issuances of Company Equity Securities. Notwithstanding
anything herein (including in Subsection 5.1) to the contrary, the Company shall
not, without the consent of the University, issue any Company Equity Securities
for cash if (a) the Company has not generated more than $500,000,000 in total
revenues during any period of 12 consecutive months and, as a result of such
issuance, the University would own less than five percent of the outstanding
Company


                                       18


Common (on a fully diluted basis) or (b) the Company has not generated more than
$750,000,000 in total revenues during any period of 12 consecutive months and,
as a result of such issuance, the University would own less than four percent of
the outstanding Company Common (on a fully diluted basis).

      9.3. Limitation on Expansion. Centene shall not acquire, initiate or
otherwise operate, directly or indirectly through a subsidiary, any
Medicaid-related business in the State of New Jersey that competes with the
business of the Company, other than through the Company and Company
Subsidiaries.

      9.4. Financial Statements and Other Information. Until such time as the
University no longer holds any of the Additional Company Shares:

            (a) The Company shall deliver to the University and Centene as
      promptly as practicable following the last day of each fiscal year of the
      Company, and in any event within 90 days after the end of each such fiscal
      year, (i) the unaudited statutory statement of admitted assets,
      liabilities and surplus of the Company as of the last day of the fiscal
      year then ended and the unaudited statutory statements of income, changes
      in surplus, and cash flows of the Company for such fiscal year and (ii)
      the unaudited balance sheet of the Company as of the last day of the
      fiscal year then ended and the unaudited statements of operations and cash
      flows of the Company as of such fiscal year. The financial statements
      delivered pursuant to clause (i) above shall be prepared in accordance
      with accounting practices prescribed or permitted by the State of New
      Jersey Department of Banking and Insurance applied on a basis consistent
      throughout the periods covered, and shall fairly present, in all material
      respects, the admitted assets, liabilities and surplus as of the
      respective dates thereof and the results of operations and cash flows of
      the Company for the periods referred to therein, on the basis of the
      accounting described in the respective notes thereto, and shall be
      consistent with the books and records of the Company. The financial
      statements delivered pursuant to clause (ii) above shall be prepared in
      accordance with United States generally accepted accounting principles
      applied on a basis consistent throughout the periods covered thereby,
      fairly present the financial condition, results of operations and cash
      flows of the Company as of the respective dates thereof and for the
      periods referred to therein, and be consistent with the books and records
      of the Company, provided that such financial statements shall be subject
      to normal recurring year-end adjustments (which shall not be material) and
      do not include all footnotes required by such generally accepted
      accounting principles.

            (b) The Company shall deliver to the University and Centene as
      promptly as practicable following the last day of each calendar month
      after the date hereof (other than the final month of any fiscal year), and
      in any event within 30 days after the end of each such month, (i) an
      unaudited balance sheet as of the end of such month, (ii) unaudited
      statements of operations and cash flows for such month and for the portion
      of the fiscal year ending as of the end of such month, and (iii) a
      calculation of statutory net worth requirement for the portion of the
      fiscal year ending as of the end of such month. Each set of unaudited
      financial statements delivered pursuant to clauses (i) and (ii) above
      shall be prepared in accordance with United States generally accepted
      accounting principles applied on a basis consistent with the periods
      covered by the financial statements, shall fairly present the financial
      condition, results of operations and cash flows of the Company as of the
      respective dates thereof and for the periods referred to therein, and
      shall be consistent with the books and records of the Company, provided
      that such unaudited financial statements may be subject to normal
      recurring year-end adjustments (which shall not be material) and need not
      include all footnotes required under such principles.


                                       19


      9.5. Board of Directors

            (a) The Company shall promptly reimburse in full each director of
      the Company who is not an employee of the Company for all of his or her
      reasonable out-of-pocket expenses incurred in attending each meeting of
      the Board of Directors of the Company or any committee thereof.

            (b) The Company's Certificate of Incorporation shall at all times
      provide for the indemnification of the directors of the Company to the
      fullest extent provided by the law of the jurisdiction in which the
      Company is organized. In the event that the Company or any of its
      successors or assigns (i) consolidates with or mergers into any other
      entity and shall not be the continuing or surviving corporation in such
      consolidation or merger or (ii) transfers or conveys all or substantially
      all of its properties and assets to any entity, then, and in each such
      case, to the extent necessary, proper provision shall be made so that the
      successors and assigns of the Company assume the obligations of the
      Company with respect to indemnification of directors of the Company as
      contained in the Company's Certificate of Incorporation.

      9.6. Surplus Allocation. In the event the Company acquires all or
substantially all of the capital stock or assets of a company or business
providing Medicaid-related programs and services, and in the event that the
Board of Directors of the Company subsequently determines to distribute to the
Company's stockholders any reserve in excess of statutory requirements, the
University shall be entitled to receive a percentage of such distribution equal
to 1.4 multiplied by the percentage of common stock of the Company (on a fully
diluted basis) then held by the University, provided that the rights of the
University set forth in this Subsection 9.6 will terminate upon the termination
or expiration of the provider agreement between the Company and University
Hospital. Notwithstanding the foregoing, it is understood that the Board of
Directors of the Company will not consider any distribution of excess reserves
to stockholders except to the extent the amount of the reserves exceeds 140% of
the applicable statutory requirement.

10.   General

      10.1. Termination. The provisions of Sections 1 through 5, 8 and 9 shall
terminate as of the earliest to occur of (a) the Option Closing Date, (b) the
Exchange Date and (c) a Company Sale. The provisions of Section 7 shall
terminate as of the first date on which the University and its permitted assigns
no longer hold any Registrable Shares, except that all rights and obligations
accruing to the parties under the provisions of Subsections 7.3 and 7.4 prior to
such date shall continue and not terminate. The provisions of Subsection 9.2
shall terminate as of the first date on which the University no longer holds any
Additional Company Shares.

      10.2. Notices. All notices, requests, demands, claims, and other
communications hereunder shall be in writing. Any notice, request, demand, claim
or other communication hereunder shall be deemed duly delivered four business
days after it is sent by registered or certified mail, return receipt requested,
postage prepaid, or one business day after it is sent for next business day
delivery via a reputable nationwide overnight courier service, in each case to
the intended recipient as set forth below:

To the University:       University of Medicine and Dentistry of New Jersey
                         65 Bergen Street
                         Newark, New Jersey  07107
                         Attention:  Senior Vice President, Administration and
                                     Finance


                                       20


    With a copy to:      Epstein Becker & Green, P.C.
                         1227 25th Street, NW, Suite 700
                         Washington, DC  20037-1175
                         Attention:  Robert D. Reif

To the Company:          University Health Plans, Inc.
                         555 Broad Street, 17th Floor
                         Newark, New Jersey  07102
                         Attention:  President

To Centene:              Centene Corporation
                         7711 Carondelet Avenue, Suite 800
                         St. Louis, Missouri  63801
                         Attention:  President and Chief Executive Officer

    With a copy to:      Hale and Dorr LLP
                         60 State Street
                         Boston, Massachusetts  02109
                         Attention:  Mark L. Johnson

      Any party may give any notice, request, demand, claim or other
communication hereunder using any other means (including personal delivery,
expedited courier, messenger service, telecopy, telex, ordinary mail or
electronic mail), but no such notice, request, demand, claim or other
communication shall be deemed to have been duly given unless and until it
actually is received by the party for whom it is intended. Any party may change
the address to which notices, requests, demands, claims, and other
communications hereunder are to be delivered by giving the other parties notice
in the manner herein set forth.

      10.3. Successors, Assigns and Transferees. This Agreement shall be binding
upon and inure to the benefit of the parties hereto and their respective
successors and permitted assigns. No party may assign its rights and obligations
hereunder except that the University or Centene may assign their respective
rights and obligations hereunder to (a) any person or entity to which Company
Shares are transferred by such party, or (b) to any Affiliate of such party,
and, in each case, such transferee shall be deemed a "party" for purposes of
this Agreement, provided that such assignment of rights shall be contingent upon
the transferee providing a written instrument to the Company notifying the
Company of such transfer and assignment and agreeing in writing to be bound by
the terms of this Agreement. Notwithstanding the foregoing, any person or entity
to which any Company Shares or Registrable Shares are transferred by a party
hereto, whether voluntarily or by operation of law, shall be bound by the terms
of this Agreement to the same extent as if such transferee were a party
hereunder and no party hereto shall transfer any Company Shares or Registrable
Shares unless the transferee provides a written instrument to the Company
notifying the Company of such transfer and agreeing in writing to be bound by
the terms of this Agreement. Any assignment in contravention of this provision
shall be void.

      10.4. Entire Agreement; Amendments.


            (a) This Agreement represents the entire understanding and agreement
      between the parties hereto with respect to the subject matter hereof and
      supersedes all prior oral and written and all contemporaneous oral
      negotiations, commitments and understandings between such parties, except
      as contemplated by the Purchase Agreement.


                                       21


            (b) This Agreement may be amended only with the written consent of
      the University, the Company and Centene. No waiver of any right or remedy
      hereunder shall be valid unless the same shall be in writing and signed by
      the party giving such waiver. No waiver by any party with respect to any
      condition, default or breach of covenant hereunder shall be deemed to
      extend to any prior or subsequent condition, default or breach of covenant
      hereunder or affect in any way any rights arising by virtue of any prior
      or subsequent such occurrence.

      10.5. Severability. Any provision of this Agreement that is invalid,
illegal or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity, illegality or unenforceability,
without affecting in any way the remaining provisions hereof in such
jurisdiction or rendering that or any other provision of this Agreement invalid,
illegal or unenforceable in any other jurisdiction.

      10.6. Specific Performance. In addition to any and all other remedies that
may be available at law in the event of any breach of this Agreement, each party
hereto shall be entitled to specific performance of the agreements and
obligations of the Company hereunder and to such other injunctive or other
equitable relief as may be granted by a court of competent jurisdiction.

      10.7. Submission to Jurisdiction. Each party (a) submits to the
jurisdiction of any state or federal court sitting in Essex County, New Jersey
in any action or proceeding arising out of or relating to this Agreement
(including any action or proceeding for the enforcement of any arbitral award
made in connection with any arbitration of a Dispute hereunder), (b) agrees that
all claims in respect of such action or proceeding may be heard and determined
in any such court, (c) waives any claim of inconvenient forum or other challenge
to venue in such court, (d) agrees not to bring any action or proceeding arising
out of or relating to this Agreement in any other court and (e) waives any right
it may have to a trial by jury with respect to any action or proceeding arising
out of or relating to this Agreement; provided in each case that, solely with
respect to any arbitration of a Dispute, the Arbitrator shall resolve all
threshold issues relating to the validity and applicability of the arbitration
provisions of this Agreement, contract validity applicability of statutes of
limitations and issue preclusion, and such threshold issues shall not be heard
or determined by such court.

      10.8. Governing Law. This Agreement shall be governed by and construed in
accordance with the laws of the State of New Jersey.

      10.9. Construction

            (a) The language used in this Agreement shall be deemed to be the
      language chosen by the parties to express their mutual intent, and no rule
      of strict construction shall be applied against any party.

            (b) The headings of the Sections and Subsections of this Agreement
      are included only for convenience and shall not affect the meaning or
      interpretation of this Agreement.

            (c) References herein to Sections and Subsections shall mean such
      Sections and Subsections of this Agreement, except as otherwise specified.
      The words "herein" and "hereof" and other words of similar import refer to
      this Agreement as a whole and not to any particular part of this
      Agreement. The word "including" as used herein shall not be construed so
      as to exclude any other thing not referred to or described.

            (d) In computing any period of time under this Agreement, the day
      from which the designated period of time begins to run shall not be
      included; the last day of the period so computed shall be included, unless
      it is not a business day, in which event the period shall run until the
      end of the next day that is a business day.


                                       22


      10.10. Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
shall constitute one and the same document.

                     [Remainder of page intentionally blank]


                                       23


      IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto as of and on the date first above written.

                                    UNIVERSITY OF MEDICINE AND DENTISTRY
                                     OF NEW JERSEY

                                    By:/s/ Denise Mulkern
                                       -----------------------------------------
                                       Denise Mulkern
                                       Acting Senior Vice President,
                                        Administration and Finance


                                    UNIVERSITY HEALTH PLANS, INC.

                                    By:/s/ Alexander H. McLean
                                       -----------------------------------------
                                       Alexander H. McLean
                                       President and Chief Executive Officer


                                    CENTENE CORPORATION

                                    By:/s/ Michael F. Neidorff
                                       -----------------------------------------
                                       Michael F. Neidorff
                                       President and Chief Executive Officer


                                       24