Document:

<PAGE>

                                                                   Exhibit 10.65

                              PURCHASE AGREEMENT

     This PURCHASE AGREEMENT (this "Agreement"), dated as of August 28, 2000, is
                                    ---------
entered into by and between Myriad Genetics Inc., a Delaware corporation with
offices at 320 Wakara Way, Salt Lake City, Utah 84108 (the "Company"), and Acqua
                                                            -------
Wellington North American Equities Fund, Ltd., a company organized under the
laws of the Commonwealth of the Bahamas, with offices c/o Fortis Fund Services
(Bahamas) Ltd., Montague Sterling Centre, East Bay Street, P. O. Box SS-6238,
Nassau, Bahamas (the "Purchaser"), for the purchase and sale of shares of the
                      ---------
common stock, par value $0.01 per share (the "Common Stock"), of the Company by
                                              ------------
the Purchaser, in the manner, and upon the terms, provisions and conditions set
forth in this Agreement.

     WHEREAS, the parties desire that, upon the terms and subject to the
conditions contained herein, the Company shall issue and sell to the Purchaser
and Purchaser shall purchase shares of Common Stock; and

     WHEREAS, such purchase and sale will be made in reliance upon the
provisions of Section 4(2) and Rule 506 of Regulation D ("Regulation D") of the
                                                          ------------
United States Securities Act of 1933, as amended and regulations promulgated
thereunder (the "Securities Act"), or upon such other exemption from the
                 --------------
registration requirements of the Securities Act as may be available with respect
to any or all of the purchases of Common Stock to be made hereunder.

     NOW, THEREFORE, in consideration of the representations, warranties and
agreements contained herein and other good and valuable consideration, the
receipt and legal adequacy of which is hereby acknowledged by the parties, the
Company and the Purchaser hereby agree as follows:

     1.   Purchase Price.
          --------------

          (a)  Upon the following terms and subject to the conditions contained
herein, the Purchaser hereby agrees to purchase 175,000 shares of the
Company's Common Stock (the "Shares") at a per share price of $126.25 and
                             ------
for an aggregate purchase price of $22,093,750 (the "Purchase Price").
                                                     --------------

          (b)  The Company has authorized and has reserved and covenants to
continue to reserve, free of preemptive rights and other similar contractual
rights of stockholders, a sufficient number of its authorized but unissued
shares of its Common Stock, to effect the issuance of the Shares.

          (c)  The closing under this Agreement shall take place at the offices
of the Parker Chapin LLP, The Chrysler Building, 405 Lexington Avenue, New York,
New York 10174 at 1:00 p.m. (eastern time) upon the satisfaction of each of the
conditions set forth in Section 5 hereof (the "Closing Date").
                                               ------------
<PAGE>

     2.  Representations, Warranties and Covenants of the Purchaser.  The
         ----------------------------------------------------------
Purchaser represents and warrants to the Company, and covenants for the benefit
---------
of the Company, as follows:

         (a)  This Agreement has been duly authorized, validly executed and
delivered by the Purchaser and is a valid and binding agreement and obligation
of the Purchaser enforceable against the Purchaser in accordance with its terms,
subject to limitations on enforcement by general principles of equity and by
bankruptcy or other laws affecting the enforcement of creditors' rights
generally, and the Purchaser has full power and authority to execute and deliver
this Agreement and the other agreements and documents contemplated hereby and to
perform its obligations hereunder and thereunder.

          (b)  The Purchaser has received and carefully reviewed copies of the
Public Documents (as hereinafter defined). The Purchaser understands that no
Federal, state, local or foreign governmental body or regulatory authority has
made any finding or determination relating to the fairness of an investment in
any of the Shares and that no Federal, state, local or foreign governmental body
or regulatory authority has recommended or endorsed, or will recommend or
endorse, any investment in any of the Shares. The Purchaser, in making the
decision to purchase the Shares, has relied upon independent investigation made
by it and has not relied on any information or representations made by third
parties.

          (c)  The Purchaser understands that the Shares are being offered and
sold to it in reliance on specific provisions of Federal and state securities
laws and that the Company is relying upon the truth and accuracy of the
representations, warranties, agreements, acknowledgments and understandings of
the Purchaser set forth herein for purposes of qualifying for exemptions from
registration under the Securities Act, and applicable state securities laws.

          (d)  The Purchaser is an "accredited investor" as defined under Rule
501 of Regulation D promulgated under the Securities Act.

          (e)  The Purchaser is and will be acquiring the Shares for such
Purchaser's own account, and not with a view to any resale or distribution of
the Shares in whole or in part, in violation of the Securities Act or any
applicable securities laws.

          (f)  The offer and sale of the Shares is intended to be exempt from
registration under the Securities Act, by virtue of Section 4(2) and Regulation
D promulgated under the Securities Act. The Purchaser understands that the
Shares purchased hereunder have not been, and may never be, registered under the
Securities Act and that none of the Shares can be sold, transferred, assigned,
pledged or subjected to any lien or security interest unless they are first
registered under the Securities Act and such state and other securities laws as
may be applicable or in the opinion of counsel for the Company an exemption from
registration under the Securities Act is available (and then the Shares may be
sold, transferred, assigned, pledged or subjected to a lien or security interest
only in compliance with such exemption and all applicable state and other
securities laws).

                                      -2-
<PAGE>

          (g)  The Purchaser (i) has such knowledge and experience in financial
and business matters as to be capable of evaluating the merits and risks of an
investment in the Company; and (ii) recognizes that such Purchaser's investment
in the Company involves a high degree of risk.

          (h)  The Purchaser is capable of evaluating the risks and merits of an
investment in the Shares by virtue of its experience as an investor and its
knowledge, experience, and sophistication in financial and business matters and
such Purchaser is capable of bearing the entire loss of its investment in the
Shares.

          (i)  The Purchaser is neither a registered broker-dealer nor an
affiliate of a registered broker-dealer.

     3.   Representations, Warranties and Covenants of the Company.  The Company
          --------------------------------------------------------
represents and warrants to the Purchaser, and covenants for the benefit of the
Purchaser, as follows:

          (a)  The Company has been duly incorporated and is validly existing
and in good standing under the laws of the state of Delaware, with full
corporate power and authority to own, lease and operate its properties and to
conduct its business as currently conducted, and is duly registered and
qualified to conduct its business and is in good standing in each jurisdiction
or place where the nature of its properties or the conduct of its business
requires such registration or qualification, except where the failure to
register or qualify would not shave a Material Adverse Effect. For purposes of
this agreement, "Material Adverse Effect" shall mean any effect on the business,
results of operations, assets or financial condition of the Company that is
material and adverse to the Company and its subsidiaries, taken as a whole
and/or any condition, circumstance, or situation that would prohibit the Company
from entering into and performing any of its obligations under this Agreement in
any material respect.

          (b)  The Company has furnished the Purchaser with copies of the
Company's most recent Annual Report on Form 10-K for fiscal year ended June 30,
1999 (the "Form 10-K") filed with the Commission and its Form 10-Q for the
           ---------
quarterly period ended March 31, 2000 (the "Form 10-Q"; collectively with the
                                            ---------
Form 10-K, the "Public Documents"). The Public Documents at the time of their
                ----------------
filing did not include any untrue statement of a material fact or omit to state
any material fact necessary in order to make the statements contained therein,
in light of the circumstances under which they were made, not misleading. As
used herein, "Commission Documents" means all reports, schedules, forms,
statements and other documents filed by the Company with the Commission pursuant
to the reporting requirements of the Exchange Act, including material filed
pursuant to Section 13(a) or 15(d) of the Exchange Act.

          (c)  The Shares have been duly authorized by all necessary corporate
action and, when paid for by the Purchaser and issued in accordance with the
terms hereof, the Shares shall be validly issued, will be fully paid and non-
assessable.

                                      -3-
<PAGE>

          (d)  Each of this Agreement and the Registration Rights Agreement
attached hereto as Exhibit A (the "Registration Rights Agreement") has been duly
                                   -----------------------------
authorized, validly executed and delivered on behalf of the Company and is a
valid and binding agreement and obligation of the Company enforceable against
the Company in accordance with its terms, subject to limitations on enforcement
by general principles of equity and by bankruptcy or other laws affecting the
enforcement of creditors' rights generally, and the Company has full power and
authority to execute and deliver this Agreement and the other agreements and
documents contemplated hereby and to perform its obligations hereunder and
thereunder.

          (e)  The execution and delivery of this Agreement and the Registration
Rights Agreement, the issuance of any of the Shares and the consummation of the
transactions contemplated by this Agreement and the Registration Rights
Agreement by the Company, will not (i) conflict with or result in a breach of or
a default under any of the terms or provisions of, (A) the Company's certificate
of incorporation or by-laws, or (B) of any material provision of any indenture,
mortgage, deed of trust or other material agreement or instrument to which the
Company is a party or by which it or any of its material properties or assets is
bound, (ii) result in a violation of any material provision of any law, statute,
rule, regulation, or any existing applicable decree, judgment or order by any
court, Federal or state regulatory body, administrative agency, or other
governmental body having jurisdiction over the Company, or any of its material
properties or assets or (iii) result in the creation or imposition of any
material lien, charge or encumbrance upon any material property or assets of the
Company or any of its subsidiaries pursuant to the terms of any agreement or
instrument to which any of them is a party or by which any of them may be bound
or to which any of their property or any of them is subject except in the case
of clauses (i)(B) or (iii) for any such conflicts, breaches, or defaults or any
liens, charges, or encumbrances which would not have a Material Adverse Effect.

          (f)  The sale and issuance of the Shares in accordance with the terms
and on the basis of the representations and warranties set forth in this
Agreement will be exempt from the registration requirements of the Securities
Act.

          (g)  No consent, approval or authorization of or designation,
declaration or filing with any governmental authority on the part of the Company
is required in connection with the valid execution and delivery of this
Agreement or the offer, sale or issuance of the Shares or the consummation of
any other transaction contemplated by this Agreement (other than any filings
which may be required to be made by the Company with the Securities and Exchange
Commission, or Nasdaq or pursuant to any state or "blue sky" securities laws
subsequent to the Closing, and, any registration statement which may be filed
pursuant to this Agreement).

          (h)  There is no action, suit, claim or proceeding before or by any
court or governmental agency or body, domestic or foreign, now pending against
or affecting the Company, or any of its properties, which questions the validity
of the Agreement, the Registration Rights Agreement or the transactions
contemplated thereby or any action taken or to be take pursuant thereto. There
is no action, suit, claim or proceeding before or by any court or governmental
agency or body, domestic or foreign, now pending against or affecting the

                                      -4-
<PAGE>

Company, or any of its properties, which, if adversely determined, is reasonably
likely to result in a Material Adverse Effect.

          (i)  Subsequent to the dates as of which information is given in the
Public Documents, except as contemplated herein, the Company has not incurred
any material liabilities or material obligations, direct or contingent, or
entered into any material transactions not in the ordinary course of business.

          (j)  The Company has sufficient title and ownership of all trademarks,
service marks, trade names, copyrights, patents, trade secrets and other
proprietary rights ("Intellectual Property") necessary for its business as now
                     ---------------------
conducted and as proposed to be conducted as described in the Public Documents
or the Commission Documents except for any of the foregoing, the absence of
which would not reasonably be likely to result in a Material Adverse Effect and,
to its knowledge without any conflict with or infringement of the rights of
others. Except as set forth in the Public Documents or the Commission Documents,
there are no material outstanding options, licenses or agreements of any kind
relating to the Intellectual Property, nor is the Company bound by or party to
any material options, licenses or agreements of any kind with respect to the
Intellectual Property of any other person or entity.

          (k)  The Company has complied and will comply with all applicable
federal and state securities laws in connection with the offer, issuance and
sale of the Shares hereunder. Neither the Company nor anyone acting on its
behalf, directly or indirectly, has or will sell, offer to sell or solicit
offers to buy any of the Shares, or similar securities to, or solicit offers
with respect thereto from, or enter into any preliminary conversations or
negotiations relating thereto with, any person, or has taken or will take any
action so as to bring the issuance and sale of any of the Shares under the
registration provisions of the Securities Act and any other applicable federal
and state securities laws. Neither the Company nor any of its affiliates, nor
any person acting on its or their behalf, has engaged in any form of general
solicitation or general advertising (within the meaning of Regulation D under
the Securities Act) in connection with any of the Shares.

          (l)  Neither this Agreement or the Schedules hereto nor the
Registration Rights Agreement contain any untrue statement of a material fact or
omit to state a material fact necessary in order to make the statements made
herein or therein, in the light of the circumstances under which they were made
herein or therein, not misleading.

          (m)  The authorized capital stock of the Company and the shares
thereof issued and outstanding as of August 28, 2000 are set forth on Schedule
                                                                      --------
3(m) attached hereto. All of the outstanding shares of the Company's Common
----
Stock have been duly and validly authorized, and are fully paid and non-
assessable. Except as set forth in this Agreement, the Public Documents the
Commission Documents or on Schedule 3(m) attached hereto, as of August 28, 2000,
                           -------------
no shares of Common Stock are entitled to preemptive rights or registration
rights and there are no outstanding options, warrants, scrip, rights to
subscribe to, call or commitments of any character whatsoever relating to, or
securities or rights convertible into, any shares of capital stock of the
Company. Furthermore, except as set forth in this Agreement, in the Public
Documents, the

                                      -5-
<PAGE>

Commission Documents or on Schedule 3(m) as of the date hereof, there are no
contracts, commitments, understandings, or arrangements by which the Company is
or may become bound to issue additional shares of the capital stock of the
Company or options, securities or rights convertible into shares of capital
stock of the Company. Except as disclosed in the Commission Documents and except
for customary transfer restrictions contained in agreements entered into by the
Company in order to sell restricted securities, as of the date hereof, the
Company is not a party to any agreement granting registration rights to any
person with respect to any of its equity or debt securities. The Company is not
a party to, and it has no knowledge of, any agreement restricting the voting or
transfer of any shares of the capital stock of the Company. The offer and sale
of all capital stock, convertible securities, rights, warrants, or options of
the Company issued prior to the Closing complied with all applicable federal and
state securities laws, and no stockholder has a right of rescission or damages
with respect thereto which is reasonably likely to have a Material Adverse
Effect. The Company has furnished or made available to the Purchaser true and
correct copies of the Company's Certificate of Incorporation as in effect on the
date hereof (the "Certificate"), and the Company's Bylaws as in effect on the
                  -----------
date hereof (the "Bylaws").
                  ------

          (n)  Prior to the effectiveness of the Registration Statement (as
defined in the Registration Rights Agreement), the Company will use its best
efforts to list the Shares for trading on the Nasdaq National Market system or
any relevant market or system, if applicable, and will comply in all material
respects with the Company's reporting, filing and other obligations under the
bylaws or rules of the NASD and NASDAQ system or any relevant market or system.

          (o)  The Company may not issue a press release or otherwise make a
public statement or announcement with respect to the transaction contemplated
hereby prior to the Closing Date. In the event that the Company is required by
law or regulations to issue a press release or otherwise make a public statement
or announcement with respect to this Agreement after the Closing Date, the
Company shall consult with the Purchaser on the form and substance of such press
release or other disclosure.

          (p)  The Company may not enter into an agreement with a third party
before the effectiveness of the Registration Statement covering the Shares, the
principal purpose of which is to secure equity financing, except for (i) an
equity financing in an amount that is equal to or less than 500,000 shares at a
price per share greater than the Purchase Price and (ii) the issuance of capital
stock to a strategic investor.

     4.   Conditions Precedent: The obligations hereunder of both the Company
          --------------------
and the Purchaser to enter into this Agreement is subject to their satisfaction
or waiver, at or before the Closing, of each of the conditions set forth below.
These conditions are for the Company's and the Purchaser's sole benefit
respectively, and they may waive their own rights at any time in their sole
discretion.

          (a)  The parties shall have executed and delivered this Agreement and
the Registration Rights Agreement.

                                      -6-
<PAGE>

          (b)  The Company shall have delivered certificates evidencing the
Shares to the Purchaser.

          (c)  Upon receipt of the certificates evidencing the Shares, the
Purchaser shall have delivered to the Company immediately available funds as
payment in full of the Purchase Price for the Shares.

          (d)  The Purchaser shall have received a legal opinion in
substantially the form annexed hereto as Exhibit A.

     5.   Legends.  Unless otherwise provided below, each certificate
          -------
representing the Shares shall be stamped or otherwise imprinted with a legend
substantially in the following form (the "Legend"):
                                          ------

          "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT
          BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED
          (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS AND MAY
          NOT BE SOLD, TRANSFERRED, ASSIGNED, PLEDGED, HYPOTHECATED OR
          OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES
          ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR MYRIAD
          GENETICS INC. (THE "COMPANY") SHALL HAVE RECEIVED AN
          OPINION, IN FORM, SCOPE AND SUBSTANCE REASONABLY ACCEPTABLE
          TO THE COMPANY, OF COUNSEL WHO IS REASONABLY ACCEPTABLE TO
          THE COMPANY THAT REGISTRATION OF SUCH SECURITIES UNDER THE
          SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE
          FEDERAL AND STATE SECURITIES LAWS IS NOT REQUIRED."

     6.   Fees and Expenses. Except as otherwise set forth in this Agreement and
          -----------------
the Registration Rights Agreement, each of the Company and the Purchaser shall
pay its respective fees and expenses related to the transactions contemplated by
this Agreement and the Registration Rights Agreement; provided, that in
                                                      --------
connection with this Agreement, the Company shall pay, within one week of the
Closing Date, a fee to Lehman Brothers in an amount mutually agreed upon by the
Company and Lehman Brothers.

     7.   Indemnification.
          ---------------

          (a)  The Company hereby agrees to indemnify and hold harmless the
Purchaser and its officers, directors, shareholders, employees, agents and
attorneys against any and all losses, claims, damages, liabilities and
reasonable expenses incurred by each such person in connection with defending or
investigating any such claims or liabilities, whether or not resulting in any
liability to such person, to which any such indemnified party may become

                                      -7-
<PAGE>

subject, insofar as such losses, claims, demands, liabilities and expenses arise
out of or are based upon any breach of any representation or warranty made by
the Company in this Agreement.

          (b)  The Purchaser hereby agrees to indemnify and hold harmless the
Company and its officers, directors, shareholders, employees, agents and
attorneys against any and all losses, claims, damages, liabilities and expenses
incurred by each such person in connection with defending or investigating any
such claims or liabilities, whether or not resulting in any liability to such
person, to which any such indemnified party may become subject under the
Securities Act, or under any other statute, at common law or otherwise, insofar
as such losses, claims, demands, liabilities and expenses arise out of or are
based upon (i) any untrue statement or alleged untrue statement of a material
fact made by the Purchaser, (ii) any omission or alleged omission of a material
fact with respect to the Purchaser or (iii) any breach of any representation,
warranty or agreement made by the Purchaser in this Agreement.

     8.   Governing Law; Consent to Jurisdiction.  This Agreement shall be
          --------------------------------------
governed by and interpreted in accordance with the laws of the State of New York
without giving effect to the rules governing the conflicts of laws. Each of the
parties consents to the exclusive jurisdiction of the Federal courts whose
districts encompass any part of the County of New York located in the City of
New York in connection with any dispute arising under this Agreement and hereby
waives, to the maximum extent permitted by law, any objection, including any
objection based on forum non conveniens, to the bringing of any such proceeding
in such jurisdictions. Each party waives its right to a trial by jury. Each
party to this Agreement irrevocably consents to the service of process in any
such proceeding by the mailing of copies thereof by registered or certified
mail, postage prepaid, to such party at its address set forth herein or its
agent. Nothing herein shall affect the right of any party to serve process in
any other manner permitted by law.

     9.  Notices.  All notices and other communications provided for or
         -------
permitted hereunder shall be made in writing by hand delivery, express overnight
courier, registered first class mail, or telecopier, initially to the address
set forth below, and thereafter at such other address, notice of which is given
in accordance with the provisions of this Section.

               (a)  if to the Company:

                    Myriad Genetics Inc.
                    320 Wakara Way
                    Salt Lake City, Utah 84108
                    Tel. No.: (801) 584-3600
                    Fax No.: (801) 584-3640
                    Attn: President

                    with a copy to:

                    Lewis J. Geffen, Esq.
                    Mintz Levin Cohn Ferris Glovsky and Popeo PC

                                      -8-
<PAGE>

                    One Financial Center
                    Boston, Massachusetts 02111
                    Tel. No.: (617) 542-6000
                    Fax No.:  (617) 542-2241

               (b)  if to the Purchaser:

                    Acqua Wellington North American Equities Fund, Ltd.
                    c/o Fortis Fund Services (Bahamas) Ltd.
                    Montague Sterling Centre
                    East Bay Street, P. O. Box SS-6238
                    Nassau, Bahamas
                    Attention:  Anthony L.M. Inder Rieden
                    Tel. No.: (242) 394-2700
                    Fax No.: (242) 394-9667

                    with a copy to:

                    Parker Chapin LLP
                    The Chrysler Building
                    405 Lexington Avenue
                    New York, New York 10174
                    Attention:  Christopher S. Auguste
                    Tel. No.: (212) 704-6000
                    Fax No.: (212) 704-6288

     All such notices and communications shall be deemed to have been duly
given: when delivered by hand, if personally delivered; when receipt is
acknowledged, if telecopied; or when actually received or refused if sent by
other means.

     10.  Entire Agreement.  This Agreement and the Registration Rights
          ----------------
Agreement constitute the entire understanding and agreement of the parties with
respect to the subject matter hereof and supersedes all prior and/or
contemporaneous oral or written proposals or agreements relating thereto all of
which are merged herein. This Agreement may not be amended or any provision
hereof waived in whole or in part, except by a written amendment signed by both
of the parties.

     11.  Counterparts.  This Agreement may be executed by facsimile signature
          ------------
and in counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                                 [end of page]

                                      -9-
<PAGE>

     IN WITNESS WHEREOF, this Agreement was duly executed on the date first
written above.

                              MYRIAD GENETICS INC.

                              By:  /s/ Jay M. Moyes
                                   Name: Jay M. Moyes
                                   Title: Chief Financial Officer
                                   Vice President Finance

                              ACQUA WELLINGTON NORTH AMERICAN EQUITIES FUND,
                              LTD.

                              By:  /s/ Anthony L.M. Inder Rieden
                                   Name:  Anthony L.M. Inder Rieden
                                   Title:  Director

                                      -10-
<PAGE>

                               EXHIBIT A TO THE

                        COMMON STOCK PURCHASE AGREEMENT

                              OPINION OF COUNSEL

          1.   The Company is a corporation duly organized, validly existing and
in good standing under the laws of the State of Delaware and has full power and
authority (corporate and other) to conduct its business as presently conducted
by it and to enter into and perform the Purchase Agreement and the Registration
Rights Agreement and to carryout the transactions contemplated thereby. There
are no jurisdictions in which, to our knowledge, the nature of the Company's
properties or the transaction of its business, makes the Company's qualification
to do business as a foreign corporation necessary, except for those
jurisdictions in which the Company is qualified, to our knowledge, to do
business as a foreign corporation or those jurisdictions in which failure to be
so qualified would not have a Material Adverse Effect.

          2.   The execution, delivery and performance by the Company of the
Purchase Agreement and the Registration Rights Agreement have been duly
authorized by all necessary corporate action of the Company, and each of the
Purchase Agreement and the Registration Rights Agreement has been duly executed
and delivered by the Company. The Purchase Agreement and the Registration Rights
Agreement each constitutes a valid and binding obligation of the Company
enforceable in accordance with its terms.

          3.   The issuance, sale and delivery of the Shares in accordance with
the Purchase Agreement have been duly authorized by all necessary corporate
action on the part of the Company and, when delivered against payment in full as
provided in the Purchase Agreement, will be validly issued, fully paid and
nonassessable. To our knowledge, the Shares are free and clear of all liens,
charges, restrictions, claims and encumbrances imposed by or through the
Company. Neither the issuance, sale or delivery of the Shares is subject to any
preemptive right of stockholders of the Company arising under law or the
Certificate of Incorporation or By-laws of the Company, each as amended to date.

          4.   The execution and delivery of the Purchase Agreement and the
Registration Rights Agreement and the performance by the Company of its
obligations thereunder, do not (A) violate any provision of the Certificate of
Incorporation or By-laws of the Company, each as amended to date, (B) violate,
conflict with or constitute a default under any material contract, commitment,
trust or agreement of any kind known to us to which the Company is a party or by
which it is bound or (C) violate the Delaware General Corporation Law or any
U.S. federal statute, regulation or rule or, to our knowledge, any judgment,
decree, writ, order or injunction of any arbitrator, court or governmental
authority binding upon the Company.

          5.   To our knowledge, there is no action, suit, proceeding or
arbitration pending against or threatened against or affecting the Company
before any court or arbitrator

                                      -11-
<PAGE>

or any governmental body, agency or official which, if adversely determined, is
reasonably likely to result in a Material Adverse Effect, or which in any manner
questions the validity of the Purchase Agreement and the issuance of the Shares
pursuant thereto, or the Registration Rights Agreement

          6.   To our knowledge, all authorizations, consents, approvals and
clearances of all governmental agencies and authorities and of third parties
required in order to permit the issuance by the Company of the Shares pursuant
to the Purchase Agreement (other than any filings which may be required to be
made by the Company with the Commission, or Nasdaq subsequent to the Closing,
and, any registration statement which may be filed pursuant to the Purchase
Agreement or the Registration Rights Agreement) have been obtained.

          7.   Subject to the truth and accuracy of the representations and
warranties of the Purchaser set forth in Section 2 of the Purchase Agreement,
the offer, issuance and sale of the Shares pursuant to the Purchase Agreement
will be exempt from registration under the Securities Act of 1933, as amended,
pursuant to Rule 4(2) and Regulation D promulgated thereunder.

                                      -12-<PAGE>

                                                                   Exhibit 10.66

                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------

          This Registration Rights Agreement is made and entered into as of
August 28, 2000 (this "Agreement"), by and between Myriad Genetics Inc., a
Delaware corporation (the "Company"), and Acqua Wellington North American
Equities Fund, Ltd., a limited liability company organized under the laws of the
Commonwealth of the Bahamas (the "Purchaser")

          This Agreement is being entered into pursuant to the Purchase
Agreement, dated as of the date hereof, by and between the Company and the
Purchaser (the "Purchase Agreement").
                ------------------

          The Company and the Purchaser hereby agree as follows:

     1.   Definitions.
          -----------

          Capitalized terms used and not otherwise defined herein shall have the
meanings given such terms in the Purchase Agreement. As used in this Agreement,
the following terms shall have the following meanings:

          Capitalized  terms used and not otherwise defined herein shall
have the meanings  given such terms in the Purchase  Agreement.  As used in this
Agreement, the following terms shall have the following meanings:

          "Advice" shall have the meaning set forth in Section 3(m).
           ------

          "Affiliate" means, with respect to any Person, any other
           ---------
Person that directly or indirectly controls or is controlled by or under common
control with such Person. For the purposes of this definition, "control," when
                                                                -------
used with respect to any Person, means the possession, direct or indirect, of
the power to direct or cause the direction of the management and policies of
such Person, whether through the ownership of voting securities, by contract or
otherwise; and the terms of "affiliated," "controlling" and "controlled" have
                             ----------    -----------       ----------
meanings correlative to the foregoing.

          "Blackout Period" shall have the meaning set forth in Section 3(n).
           ---------------

          "Board" shall have the meaning set forth in Section 3(n).
           -----

          "Business Day" means any day except Saturday, Sunday and any day which
           ------------
shall be a legal holiday or a day on which banking institutions in the state of
New York generally are authorized or required by law or other government actions
to close.

          "Commission" means the Securities and Exchange Commission.
           ----------

          "Common Stock" means the Company's Common Stock, par value
           ------------
$0.01 per share.
<PAGE>

          "Effectiveness Date" means with respect to the Registration Statement
           ------------------
the earlier of the 90th day following the Closing Date, before which the Company
will use its best efforts to cause the registration statement to become
effective, and the date which is within five (5) Business Days of the date on
which the Commission informs the Company that the Commission (i) will not review
the Registration Statement or (ii) that the Company may request the acceleration
of the effectiveness of the Registration Statement.

          "Effectiveness Period" shall have the meaning set forth in Section 2.
           --------------------

          "Event" shall have the meaning set forth in Section 7(e).
           -----

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

          "Filing Date" means the date the Registration Statement is filed
           -----------
which date shall be no later than the 30th day following the Closing Date.

          "Holder" or "Holders" means the holder or holders, as the case may be,
           ------      -------
from time to time of Registrable Securities including, including without
limitation, the Purchaser and its assignees.

          "Indemnified Party" shall have the meaning set forth in Section 5(c).
           -----------------

          "Indemnifying Party" shall have the meaning set forth in Section 5(c).
           ------------------

           "Liquidated Damages" shall have the meaning set forth in Section
            ------------------
7(e).

          "Losses" shall have the meaning set forth in Section 5(a).
           ------

          "Nasdaq" shall mean the Nasdaq National Market.
           ------

           "Person" means an individual or a corporation, partnership, trust,
            ------
incorporated or unincorporated association, joint venture, limited liability
company, joint stock company, government (or an agency or political subdivision
thereof) or other entity of any kind.

          "Proceeding" means an action, claim, suit, investigation or proceeding
           ----------
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

          "Prospectus" means the prospectus included in the Registration
           ----------
Statement (including, without limitation, a prospectus that includes any
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A promulgated under the
Securities Act), as amended or supplemented by any prospectus supplement, with
respect to the terms of the offering of any portion of the Registrable
Securities covered by the Registration Statement, and all other amendments and
supplements to the Prospectus, including post-effective amendments, and all
material incorporated by reference in such Prospectus.

                                      -2-
<PAGE>

          "Registrable Securities" means (i) the shares of Common Stock issued
           ----------------------
pursuant to the Purchase Agreement (the "Common Shares") and upon any stock
split, stock dividend, recapitalization or similar event with respect to such
Common Shares, and (ii) any other dividend or other distribution with respect
to, conversion or exchange of, or in replacement of, Registrable Securities.

          "Registration Statement" means the registration statement and any
           ----------------------
additional registration statements contemplated by Section 2, including (in each
case) the Prospectus, amendments and supplements to such registration statement
or Prospectus, including pre- and post-effective amendments, all exhibits
thereto, and all material incorporated by reference in such registration
statement.

          "Rule 144" means Rule 144 promulgated by the Commission pursuant to
           --------
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

          "Rule 158" means Rule 158 promulgated by the Commission pursuant to
           --------
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

          "Rule 415" means Rule 415 promulgated by the Commission pursuant to
           --------
the Securities Act, as such Rule may be amended from time to time, or any
similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

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

          "Special Counsel" means any special counsel to the Holders, for which
            ---------------
the Holders will be reimbursed by the Company pursuant to Section 4.

     2.   Registration.  On or prior to the Filing Date, the Company shall
          ------------
prepare and file with the Commission a "shelf" Registration Statement covering
all Registrable Securities for an offering to be made on a continuous basis
pursuant to Rule 415. The Registration Statement shall be on Form S-3 (except if
the Company is not then eligible to register for resale the Registrable
Securities on Form S-3, in which case such registration shall be on another
appropriate form in accordance herewith). The Company shall (i) not permit any
securities other than the Registrable Securities and the securities set forth in
Schedule 2 attached hereto to be included in the Registration Statement, (ii)
----------
use its best efforts to cause the Registration Statement to be declared
effective under the Securities Act (including filing with the Commission a
request for acceleration of effectiveness in accordance with Rule 12dl-2
promulgated under the Exchange Act within five (5) Business Days of the date
that the Company is notified (orally or in writing, whichever is earlier) by the
Commission that a Registration Statement will not be "reviewed," or not be
subject to further review) as soon as possible after the filing thereof, but in
any event prior to the Effectiveness Date, and to keep such Registration
Statement continuously effective under the Securities Act until such date as is
the earlier of (x) the date when all Registrable Securities covered by such
Registration Statement have been sold or (y) the date on which the Registrable
Securities may be sold without any restriction pursuant to Rule 144(k) as

                                      -3-
<PAGE>

determined by the counsel to the Company pursuant to a written opinion letter,
addressed to the Company's transfer agent to such effect (the "Effectiveness
                                                               -------------
Period").
------

     3.   Registration Procedures.
          -----------------------

          In connection with the Company's registration obligations hereunder,
the Company shall:

          (a)   Prepare and file with the Commission on or prior to the Filing
Date, a Registration Statement on Form S-3 (or if the Company is not then
eligible to register for resale the Registrable Securities on Form S-3 such
registration shall be on another appropriate form in accordance herewith) in
accordance with the method or methods of distribution thereof as specified by
the Holders (except if otherwise directed by the Holders), and use its best
efforts to cause the Registration Statement to become effective and remain
effective as provided herein; provided, however, that not less than three (3)
                              --------  -------
Business Days prior to the filing of the Registration Statement or any related
Prospectus or any amendment or supplement thereto (including any document that
would be incorporated therein by reference), the Company shall (i) furnish to
the Holders and any Special Counsel, copies of all such documents proposed to be
filed, which documents (other than those incorporated by reference) will be
subject to the review of such Holders and such Special Counsel, and (ii) at the
request of any Holder cause its officers and directors, counsel and independent
certified public accountants to respond to such inquiries as shall be necessary,
in the reasonable opinion of counsel to such Holders, to conduct a reasonable
investigation within the meaning of the Securities Act. The Company shall not
file the Registration Statement or any such Prospectus or any amendments or
supplements thereto containing information about the Holders or the distribution
of securities owned by the Holders ("Holder Information") if the Holders of a
majority of the Registrable Securities or any Special Counsel shall reasonably
object in writing within three (3) Business Days of their receipt thereof to any
of the Holder Information unless the Company has received an opinion of counsel
to the effect that such disclosure is required by applicable law, rules or
regulations (including Nasdaq regulations).

          (b)   (i)  Prepare and file with the Commission such amendments,
including post-effective amendments, to the Registration Statement as may be
necessary to keep the Registration Statement continuously effective as to the
applicable Registrable Securities for the Effectiveness Period and prepare and
file with the Commission such additional Registration Statements in order to
register for resale under the Securities Act all of the Registrable Securities;
(ii) cause the related Prospectus to be amended or supplemented by any required
Prospectus supplement, and as so supplemented or amended to be filed pursuant to
Rule 424 (or any similar provisions then in force) promulgated under the
Securities Act; (iii) respond as promptly as practicable to any comments
received from the Commission with respect to the Registration Statement or any
amendment thereto and as promptly as practicable provide the Holders true and
complete copies of all correspondence from and to the Commission relating to the
Registration Statement; and (iv) comply in all material respects with the
provisions of the Securities Act and the Exchange Act with respect to the
disposition of all Registrable Securities covered by the Registration Statement
during the applicable period in accordance with the intended methods of
disposition by the Holders thereof set forth in the Registration Statement as so
amended or in such Prospectus as so supplemented.

                                      -4-
<PAGE>

          (c)   Notify the Holders of Registrable Securities to be sold and any
Special Counsel as promptly as practicable (and, in the case of (i)(A) below,
not less than three (3) Business Days prior to such filing) and (if requested by
any such Person) confirm such notice in writing no later than one (1) Business
Day following the day (i)(A) when a Prospectus or any Prospectus supplement or
post-effective amendment to the Registration Statement is proposed to be filed;
(B) when the Commission notifies the Company whether there will be a "review" of
such Registration Statement and whenever the Commission comments in writing on
such Registration Statement and (C) with respect to the Registration Statement
or any post-effective amendment, when the same has become effective; (ii) of any
request by the Commission or any other Federal or state governmental authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional information with respect to the Registration Statement or the
Prospectus; (iii) of the issuance by the Commission of any stop order suspending
the effectiveness of the Registration Statement covering any or all of the
Registrable Securities or the initiation of any Proceedings for that purpose;
(iv) of the receipt by the Company of any notification with respect to the
suspension of the qualification or exemption from qualification of any of the
Registrable Securities for sale in any jurisdiction, or the initiation or
threatening of any Proceeding for such purpose; and (v) of the occurrence of any
event that makes any statement made in the Registration Statement or Prospectus
or any document incorporated or deemed to be incorporated therein by reference
untrue in any material respect or that requires any revisions to the
Registration Statement, Prospectus or other documents so that, in the case of
the Registration Statement or the Prospectus, as the case may be, it will not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein,
in the light of the circumstances under which they were made, not misleading.

          The Company shall promptly furnish to Special Counsel, without charge,
(i) any correspondence from the Commission or the Commission's staff to the
Company or its representatives relating to any Registration Statement and (ii)
promptly after the same is prepared and filed with the Commission, a copy of any
written response to the correspondence received from the Commission.

          (d)   Use its best efforts to avoid the issuance of, or, if issued,
obtain the withdrawal of, (i) any order suspending the effectiveness of the
Registration Statement or (ii) any suspension of the qualification (or exemption
from qualification) of any of the Registrable Securities for sale in any
jurisdiction, at the earliest practicable moment.

          (e)   If requested by the Holders of a majority in interest of the
Registrable Securities, (i) promptly incorporate in a Prospectus supplement or
post-effective amendment to the Registration Statement such information as the
Company reasonably agrees should be included therein and (ii) make all required
filings of such Prospectus supplement or such post-effective amendment as soon
as practicable after the Company has received notification of the matters to be
incorporated in such Prospectus supplement or post-effective amendment.

          (f)   Furnish to each Holder and any Special Counsel, without charge,
at least one conformed copy of each Registration Statement and each amendment
thereto, including financial statements and schedules, all documents
incorporated or deemed to be incorporated therein by reference, and all exhibits
to the extent requested by such Person (including those

                                      -5-
<PAGE>

previously furnished or incorporated by reference) as soon as practicable after
the filing of such documents with the Commission.

          (g)   Promptly deliver to each Holder and any Special Counsel, without
charge, as many copies of the Registration Statement, Prospectus or Prospectuses
(including each form of prospectus) and each amendment or supplement thereto as
such Persons may reasonably request; and the Company hereby consents to the
lawful use of such Prospectus and each amendment or supplement thereto by each
of the selling Holders in connection with the offering and sale of the
Registrable Securities covered by such Prospectus and any amendment or
supplement thereto.

          (h)   Prior to any public offering of Registrable Securities, use its
best efforts to register or qualify or cooperate with the selling Holders and
any Special Counsel in connection with the registration or qualification (or
exemption from such registration or qualification) of such Registrable
Securities for offer and sale under the securities or Blue Sky laws of such
jurisdictions within the United States as any Holder requests in writing, to
keep each such registration or qualification (or exemption therefrom) effective
during the Effectiveness Period and use its commercially reasonable best efforts
to do any and all other acts or things reasonably necessary or advisable to
enable the disposition in such jurisdictions of the Registrable Securities
covered by a Registration Statement; provided, however, that the Company shall
                                     --------  -------
not be required to qualify generally to do business in any jurisdiction where it
is not then so qualified or to take any action that would subject it to general
service of process in any such jurisdiction where it is not then so subject or
subject the Company to any tax in any such jurisdiction where it is not then so
subject.

          (i)   Cooperate with the Holders to facilitate the timely preparation
and delivery of certificates representing Registrable Securities to be sold
pursuant to a Registration Statement, which certificates shall be free of all
restrictive legends, and to enable such Registrable Securities to be in such
denominations and registered in such names as any Holder may request at least
two (2) Business Days prior to any sale of Registrable Securities.

          (j)   Upon the occurrence of any event contemplated by Section
3(c)(v), as promptly as practicable, prepare a supplement or amendment,
including a post-effective amendment, to the Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to
be incorporated therein by reference, and file any other required document so
that, as thereafter delivered, neither the Registration Statement nor such
Prospectus will contain an 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 the light of the circumstances under which they were
made, not misleading.

          (k)   Use its best efforts to cause all Registrable Securities
relating to such Registration Statement to be listed on Nasdaq and any other
securities exchange, quotation system, market or over-the-counter bulletin
board, if any, on which the same securities issued by the Company are then
listed as and when required pursuant to the Purchase Agreement, and will comply
in all material respects with the Company's reporting, filing and other
obligations under the bylaws or rules of the National Association of Securities
Dealers, Inc. and the Nasdaq system or any other applicable market or system.

                                      -6-
<PAGE>

          (l)   Comply in all material respects with all applicable rules and
regulations of the Commission and make generally available to its security
holders earning statements satisfying the provisions of Section 11(a) of the
Securities Act and Rule 158 not later than forty-five (45) days after the end of
any twelve (12)-month period (or ninety (90) days after the end of any twelve
(12)-month period if such period is a fiscal year) commencing on the first day
of the first fiscal quarter of the Company after the effective date of the
Registration Statement, which statement shall conform to the requirements of
Rule 158.

          The Purchaser and each selling Holder whose shares are covered by a
Registration Statement shall furnish to the Company information regarding such
Holder and the distribution of such Registrable Securities as is required by law
to be disclosed in the Registration Statement, and the Company may exclude from
such registration the Registrable Securities of any such Holder who fails to
furnish such information within a reasonable time prior to the filing of each
Registration Statement, supplemented Prospectus and/or amended Registration
Statement. If any Registration Statement or Prospectus refers to any Holder by
name or otherwise as the Holder of any securities of the Company, then such
Holder shall promptly notify the Company of any fact of which the Holder becomes
aware and the happening of any event which relates to the Holder or distribution
of such securities owned by such Holder which results in the Registration
Statement or the Prospectus included in such Registration Statement containing
an untrue statement of material fact or omitting to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading and shall provide to the Company such information as shall be
necessary to enable the Company to prepare a supplement or post-effective
Amendment to such Registration Statement or Prospectus or any document
incorporated therein by reference or file any other document required so that
the Registration Statement or Prospectus will not contain an untrue statement of
material fact or omit to state a material fact required to be stated therein.

          If the Registration Statement refers to any Holder by name or
otherwise as the holder of any securities of the Company, then such Holder shall
have the right to require (if such reference to such Holder by name or otherwise
is not required by the Securities Act or any similar federal statute then in
force) the deletion of the reference to such Holder in any amendment or
supplement to the Registration Statement filed or prepared subsequent to the
time that such reference ceases to be required.

          Each Holder covenants and agrees that (i) it will not sell any
Registrable Securities under the Registration Statement until it has received
copies of the Prospectus as then amended or supplemented as contemplated in
Section 3(g) and notice from the Company that such Registration Statement and
any post-effective amendments thereto have become effective as contemplated by
Section 3(c) and (ii) it and its officers, directors or Affiliates, if any, will
comply with the prospectus delivery requirements of the Securities Act as
applicable to them in connection with sales of Registrable Securities pursuant
to the Registration Statement.

          Each Holder agrees by its acquisition of such Registrable Securities
that, upon receipt of a notice from the Company of the occurrence of any event
of the kind described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv) or 3(c)(v), such
Holder will forthwith discontinue disposition of such Registrable Securities
under the Registration Statement until such Holder's receipt of the copies of
the supplemented Prospectus and/or amended Registration Statement contemplated
by

                                      -7-
<PAGE>

Section 3(j), or until it is advised in writing (the "Advice") by the Company
that the use of the applicable Prospectus may be resumed, and, in either case,
has received copies of any additional or supplemental filings that are
incorporated or deemed to be incorporated by reference in such Prospectus or
Registration Statement.

          (m)   If (i) there is material non-public information regarding the
Company which the Company's Board of Directors (the "Board") reasonably
determines not to be in the Company's best interest to disclose and which the
Company is not otherwise required to disclose, or (ii) there is a significant
business opportunity (including, but not limited to, the acquisition or
disposition of assets (other than in the ordinary course of business) or any
merger, consolidation, tender offer or other similar transaction) available to
the Company which the Board reasonably determines not to be in the Company's
best interest to disclose and which the Company would be required to disclose
under the Registration Statement, then the Company may suspend effectiveness of
a registration statement and suspend the sale of Registrable Securities under a
Registration Statement for a period not to exceed thirty (30) consecutive days,
provided that the Company may not suspend its obligation under this Section 3(m)
for more than forty-five (45) days in the aggregate during any twelve (12) month
period (each, a "Blackout Period"); provided, however, that no such suspension
                 ---------------    --------  -------
shall be permitted for consecutive thirty (30) day periods, arising out of the
same set of facts, circumstances or transactions.

          (n)   Within two (2) business days after the Registration Statement
which includes the Registrable Securities is ordered effective by the
Commission, the Company shall deliver, and shall cause legal counsel for the
Company to deliver, to the transfer agent for such Registrable Securities (with
copies to the Holders whose Registrable Securities are included in such
Registration Statement) confirmation that the Registration Statement has been
declared effective by the Commission in the form attached hereto as Exhibit A.

     4.   Registration Expenses.
          ---------------------

          All fees and expenses incident to the performance of or compliance
with this Agreement by the Company shall be borne by the Company whether or not
the Registration Statement is filed or becomes effective and whether or not any
Registrable Securities are sold pursuant to the Registration Statement. The fees
and expenses referred to in the foregoing sentence shall include, without
limitation the following: (i) all registration and filing fees (including,
without limitation, fees and expenses (A) with respect to filings required to be
made with the Nasdaq and each other securities exchange or market on which
Registrable Securities are required hereunder to be listed, (B) with respect to
filings required to be made with the Commission, and (C) in compliance with
state securities or Blue Sky laws (including, without limitation, fees and
disbursements of one counsel for the Holders in connection with Blue Sky
qualifications of the Registrable Securities and determination of the
eligibility of the Registrable Securities for investment under the laws of such
jurisdictions as the Holders of a majority of Registrable Securities may
designate subject to the maximum fee of $2,500), (ii) printing expenses
(including, without limitation, expenses of printing certificates for
Registrable Securities and of printing prospectuses if the printing of
prospectuses is requested by the holders of a majority of the Registrable
Securities included in the Registration Statement), (iii) messenger, telephone
and delivery expenses, (iv) Securities Act liability insurance, if the Company
so desires such insurance, and (v) fees and expenses of all other Persons
retained by

                                      -8-
<PAGE>

the Company in connection with the consummation of the transactions
contemplated by this Agreement, including, without limitation, the Company's
independent public accountants (including the expenses of any comfort letters or
costs associated with the delivery by independent public accountants of a
comfort letter or comfort letters); provided that the Company shall not be
responsible for the fees and expenses of the Special Counsel. In addition, the
Company shall be responsible for all of its internal expenses incurred in
connection with the consummation of the transactions contemplated by this
Agreement (including, without limitation, all salaries and expenses of its
officers and employees performing legal or accounting duties), the expense of
any annual audit, the fees and expenses incurred in connection with the listing
of the Registrable Securities on any securities exchange as required hereunder.

     5.   Indemnification.
          ---------------

          (a)   Indemnification by the Company. The Company shall,
                ------------------------------
notwithstanding any termination of this Agreement, indemnify and hold harmless
each Holder, the officers, directors, agents, brokers (including brokers who
offer and sell Registrable Securities as principal as a result of a pledge or
any failure to perform under a margin call of Common Stock), investment advisors
and employees of each of them, each Person who controls any such Holder (within
the meaning of Section 15 of the Securities Act or Section 20 of the Exchange
Act) and the officers, directors, agents and employees of each such controlling
Person, and the respective successors, assigns, estate and personal
representatives of each of the foregoing, to the fullest extent permitted by
applicable law, from and against any and all claims, losses, damages,
liabilities, penalties, judgments, costs (including, without limitation, costs
of investigation) and expenses (including, without limitation, reasonable
attorneys' fees and expenses) (collectively, "Losses"), as incurred, arising out
of or relating to any untrue or alleged untrue statement of a material fact
contained in the Registration Statement, any Prospectus or any preliminary
prospectus or in any amendment or supplement thereto, or arising out of or
relating to any omission or alleged omission of a material fact required to be
stated therein or necessary to make the statements therein (in the case of any
Prospectus or preliminary prospectus or supplement thereto, in the light of the
circumstances under which they were made) not misleading, except to the extent,
but only to the extent, that such untrue statements or omissions are based
solely upon information regarding such Holder furnished in writing to the
Company by such Holder expressly for use therein, which information was
reasonably relied on by the Company for use therein or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and was reviewed and expressly approved
in writing by such Holder expressly for use in the Registration Statement, such
Prospectus or such form of Prospectus or in any amendment or supplement thereto;
and provided, further, that with respect to any amended or supplemented
Prospectus, the foregoing indemnity agreement shall not apply or inure to the
benefit of any Holder from whom the Person asserting any Loss, purchased shares,
or any Person controlling such Holder, if, copies of an amended or supplemented
Prospectus were timely delivered to the Holder pursuant to this Agreement and a
copy of the Prospectus (as then amended or supplemented if the Company shall
have furnished any amendment or supplements thereto) was not sent or given by or
on behalf of such Holder to such Person, if required by law so to have been
delivered, and if the Prospectus (as so amended or supplemented) would have
cured the defect giving rise to such Loss. Such indemnity shall remain in full
force and effect regardless of any investigation made by or on behalf of an

                                      -9-
<PAGE>

Indemnified Party (as defined in Section 5(c) hereof) and shall survive the
transfer of the Registrable Securities by the Holders.

          (b)   Indemnification by Holders. Each Holder shall, notwithstanding
                --------------------------
any termination of this Agreement, severally and not jointly, indemnify and hold
harmless the Company, and its directors, officers, agents and employees, each
Person who controls the Company (within the meaning of Section 15 of the
Securities Act and Section 20 of the Exchange Act), and the directors, officers,
agents or employees of such controlling Persons, and the respective successors,
assigns, estate and personal representatives of each of the foregoing, to the
fullest extent permitted by applicable law, from and against all Losses, as
incurred, arising out of, relating to, or based upon any untrue or alleged
untrue statement of a material fact contained in the Registration Statement, any
Prospectus, or any preliminary prospectus or in any amendment or supplement
thereto, or arising out of, relating to, or based upon any omission or alleged
omission of a material fact required to be stated therein or necessary to make
the statements therein (in the case of any Prospectus or preliminary prospectus
or supplement thereto, in the light of the circumstances under which they were
made) not misleading, to the extent, but only to the extent, that such untrue
statement or omission is contained in or omitted from any information so
furnished in writing by such Holder to the Company specifically for inclusion in
the Registration Statement or such Prospectus and that such information was
reasonably relied upon by the Company for use in the Registration Statement,
such Prospectus or such preliminary prospectus or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and was reviewed and expressly approved
in writing by such Holder expressly for use in the Registration Statement, such
Prospectus or such preliminary Prospectus Supplement. Notwithstanding anything
to the contrary contained herein, the Holder shall be liable under this Section
5(b) for only that amount as does not exceed the net proceeds to such Holder as
a result of the sale of Registrable Securities pursuant to such Registration
Statement.

          (c)   Conduct of Indemnification Proceedings. If any Proceeding shall
                --------------------------------------
be brought or asserted against any Person entitled to indemnity hereunder (an
"Indemnified Party"), such Indemnified Party promptly shall notify the Person
 -----------------
from whom indemnity is sought (the "Indemnifying Party) in writing, and the
                                    ------------------
Indemnifying Party shall assume the defense thereof, including the employment of
counsel reasonably satisfactory to the Indemnified Party and the payment of all
fees and expenses incurred in connection with defense thereof; provided, that
the failure of any Indemnified Party to give such notice shall not relieve the
Indemnifying Party of its obligations or liabilities pursuant to this Agreement,
except (and only) to the extent that it shall be finally determined by a court
of competent jurisdiction (which determination is not subject to appeal or
further review) that such failure shall have proximately and materially
adversely prejudiced the Indemnifying Party.

          An Indemnified Party shall have the right to employ separate counsel
in any such Proceeding and to participate in the defense thereof, but the fees
and expenses of such counsel shall be at the expense of such Indemnified Party
or Parties unless: (1) the Indemnifying Party has agreed in writing to pay such
fees and expenses; or (2) the Indemnifying Party shall have failed promptly to
assume the defense of such Proceeding and to employ counsel reasonably
satisfactory to such Indemnified Party in any such Proceeding; or (3) the named
parties to any such Proceeding (including any impleaded parties) include both
such Indemnified Party and the

                                      -10-
<PAGE>

Indemnifying Party, and such Indemnified Party shall have been advised by
counsel reasonably acceptable to the Indemnifying Party that a conflict of
interest is likely to exist if the same counsel were to represent such
Indemnified Party and the Indemnifying Party (in which case, if such Indemnified
Party notifies the Indemnifying Party in writing that it elects to employ
separate counsel at the expense of the Indemnifying Party, the Indemnifying
Party shall not have the right to assume the defense thereof on behalf of the
Indemnified Party and such counsel shall be at the expense of the Indemnifying
Party). The Indemnifying Party shall not be liable for any settlement of any
such Proceeding effected without its written consent, which consent shall not be
unreasonably withheld. No Indemnifying Party shall, without the prior written
consent of the Indemnified Party (which consent shall not be unreasonably
withheld), effect any settlement of any pending Proceeding in respect of which
any Indemnified Party is a party, unless such settlement includes an
unconditional release of such Indemnified Party from all liability on claims
that are the subject matter of such Proceeding.

          All fees and expenses of the Indemnified Party (including reasonable
fees and expenses to the extent incurred in connection with investigating or
preparing to defend such Proceeding in a manner not inconsistent with this
Section) shall be paid to the Indemnified Party, as incurred, within ten (10)
Business Days of written notice thereof to the Indemnifying Party (regardless of
whether it is ultimately determined that an Indemnified Party is not entitled to
indemnification hereunder; provided, that the Indemnifying Party may require
                           --------
such Indemnified Party to undertake to reimburse all such fees and expenses to
the extent it is finally judicially determined that such Indemnified Party is
not entitled to indemnification hereunder).

          (d)   Contribution. If a claim for indemnification under Section 5(a)
                ------------
or 5(b) is unavailable to an Indemnified Party because of a failure or refusal
of a governmental authority to enforce such indemnification in accordance with
its terms (by reason of public policy or otherwise), then each Indemnifying
Party, in lieu of indemnifying such Indemnified Party, shall contribute to the
amount paid or payable by such Indemnified Party as a result of such Losses, in
such proportion as is appropriate to reflect the relative fault of the
Indemnifying Party and Indemnified Party in connection with the actions,
statements or omissions that resulted in such Losses as well as any other
relevant equitable considerations. The relative fault of such Indemnifying Party
and Indemnified Party shall be determined by reference to, among other things,
whether any action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged omission of a material fact, has been
taken or made by, or relates to information supplied by, such Indemnifying,
Party or Indemnified Party, and the parties' relative intent, knowledge, access
to information and opportunity to correct or prevent such action, statement or
omission. The amount paid or payable by a party as a result of any Losses shall
be deemed to include, subject to the limitations set forth in Section 5(c), any
reasonable attorneys' or other reasonable fees or expenses incurred by such
party in connection with any Proceeding to the extent such party would have been
indemnified for such fees or expenses if the indemnification provided for in
this Section was available to such party in accordance with its terms.
Notwithstanding anything to the contrary contained herein, the Holder shall be
liable or required to contribute under this Section 5(c) for only that amount as
does not exceed the net proceeds to such Holder as a result of the sale of
Registrable Securities pursuant to such Registration Statement.

                                      -11-
<PAGE>

          The parties hereto agree that it would not be just and equitable if
contribution pursuant to this Section 5(d) were determined by pro rata
allocation or by any other method of allocation that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
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.

          The indemnity and contribution agreements contained in this Section
are in addition to any liability that the Indemnifying Parties may have to the
Indemnified Parties

     6.   Rule 144.
          --------

          As long as any Holder owns Registrable Securities the Company
covenants to timely file (or obtain extensions in respect thereof and file
within the applicable grace period) all reports required to be filed by the
Company after the date hereof pursuant to Section 13(a) or 15(d) of the Exchange
Act and to promptly furnish the Holders with true and complete copies of all
such filings. As long as any Holder owns Registrable Securities, if the Company
is not required to file reports pursuant to Section 13(a) or 15(d) of the
Exchange Act, it will prepare and furnish to the Holders and make publicly
available in accordance with Rule 144(c) promulgated under the Securities Act
annual and quarterly financial statements, together with a discussion and
analysis of such financial statements in form and substance substantially
similar to those that would otherwise be required to be included in reports
required by Section 13(a) or 15(d) of the Exchange Act, as well as any other
information required thereby, in the time period that such filings would have
been required to have been made under the Exchange Act. The Company further
covenants that it will take such further action as any Holder may reasonably
request, all to the extent required from time to time to enable such Person to
sell Common Stock without registration under the Securities Act within the
limitation of the exemptions provided by Rule 144 promulgated under the
Securities Act, including providing any legal opinions of counsel to the Company
referred to in the Purchase Agreement. Upon the request of any Holder, the
Company shall deliver to such Holder a written certification of a duly
authorized officer as to whether it has complied with such requirements.

     7.   Miscellaneous.
          -------------

          (a)   Remedies.  In the event of a breach by the Company or by a
                --------
Holder, of any of their obligations under this Agreement, each Holder or the
Company, as the case may be, in addition to being entitled to exercise all
rights granted by law and under this Agreement, including recovery of damages,
will be entitled to specific performance of its rights under this Agreement. The
Company and each Holder agree that monetary damages would not provide adequate
compensation for any losses incurred by reason of a breach by it of any of the
provisions of this Agreement and hereby further agrees that, in the event of any
action for specific performance in respect of such breach, it shall waive the
defense that a remedy at law would be adequate.

          (b)   No Inconsistent Agreements. Neither the Company nor any of its
                --------------------------
subsidiaries has, as of the date hereof entered into and currently in effect,
nor shall the Company or any of its subsidiaries, on or after the date of this
Agreement, enter into any agreement with

                                      -12-
<PAGE>

respect to its securities that is inconsistent with the rights granted to the
Holders in this Agreement or otherwise conflicts with the provisions hereof.
Except as disclosed in the Commission Documents, neither the Company nor any of
its subsidiaries has previously entered into any agreement currently in effect
granting any registration rights with respect to any of its securities to any
Person. Without the written consent of the Holders of a majority of the then
outstanding Registrable Securities, the Company shall not grant to any Person
the right to request the Company to register any securities of the Company under
the Securities Act unless the rights so granted are subject in all respects to
the prior rights in full of the Holders set forth herein, and are not otherwise
in conflict with the provisions of this Agreement.

          (c)   No Piggyback on Registrations. The Company nor any of its
                -----------------------------
security holders (other than the Holders in such capacity pursuant hereto and
the security holders set forth on Schedule 2 attached hereto) may include
securities of the Company in the Registration Statement.

          (d)   Piggy-Back Registrations. If at any time during the
                ------------------------
Effectiveness Period when there is not an effective Registration Statement
covering Common Shares, the Company shall determine to prepare and file with the
Commission a registration statement relating to an offering for its own account
or the account of others under the Securities Act of any of its equity
securities, other than on Form S-4 or Form S-8 (each as promulgated under the
Securities Act) or its then equivalents relating to equity securities to be
issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee
benefit plans, the Company shall send to each holder of Registrable Securities
written notice of such determination and, if within ten (10) days after receipt
of such notice, any such holder shall so request in writing (which request shall
specify the Registrable Securities intended to be disposed of by the Holders),
the Company will use its best efforts to cause the registration under the
Securities Act of all Registrable Securities which the Company has been so
requested to register by the holder, to the extent requisite to permit the
disposition of the Registrable Securities so to be registered, provided that if
at any time after giving written notice of its intention to register any
securities and prior to the effective date of the registration statement filed
in connection with such registration, the Company shall determine for any reason
not to register or to delay registration of such securities, the Company may, at
its election, give written notice of such determination to such holder and,
thereupon, (i) in the case of a determination not to register, shall be relieved
of its obligation to register any Registrable Securities in connection with such
registration (but not from its obligation to pay expenses in accordance with
Section 4 hereof), and (ii) in the case of a determination to delay registering,
shall be permitted to delay registering any Registrable Securities being
registered pursuant to this Section 7(d) for the same period as the delay in
registering such other securities. The Company shall include in such
registration statement all or any part of such Registrable Securities such
holder requests to be registered; provided, however, that the Company shall not
                                  --------  -------
be required to register any Registrable Securities pursuant to this Section 7(d)
that are eligible for sale pursuant to Rule 144(k) of the Securities Act. In the
case of an underwritten public offering, if the managing underwriter(s) or
underwriter(s) should reasonably object to the inclusion of the Registrable
Securities in such registration statement, then if the Company after
consultation with the managing underwriter should reasonably determine that the
inclusion of such Registrable Securities, would materially adversely affect the
offering contemplated in such registration statement, and based on such
determination recommends inclusion in such registration statement

                                      -13-
<PAGE>

of fewer or none of the Registrable Securities of the Holders, then (x) the
number of Registrable Securities of the Holders included in such registration
statement shall be reduced pro-rata among such Holders (based upon the number of
Registrable Securities requested to be included in the registration), if the
Company after consultation with the underwriter(s) recommends the inclusion of
fewer Registrable Securities, or (y) none of the Registrable Securities of the
Holders shall be included in such registration statement, if the Company after
consultation with the underwriter(s) recommends the inclusion of none of such
Registrable Securities.

          (i)   Failure to File Registration Statement and Other Events. The
                -------------------------------------------------------
Company and the Holders agree that the Holders will suffer damages if the
Registration Statement is not filed or confidentially submitted on or prior to
the Filing Date and not declared effective by the Commission on or prior to the
Effectiveness Date and maintained in the manner contemplated herein during the
Effectiveness Period or if certain other events occur. The Company and the
Holders further agree that it would not be feasible to ascertain the extent of
such damages with precision. Accordingly, if (I) the Registration Statement is
not filed or confidentially submitted on or prior to the Filing Date, or is not
declared effective by the Commission on or prior to the Effectiveness Date (or
in the event an additional Registration Statement is filed or confidentially
submitted because the actual number of Common Shares exceeds the number of
shares of Common Shares initially registered is not filed and declared effective
within the time periods set forth in Section 2), or (II) the Company fails to
file with the Commission a request for acceleration in accordance with Rule
12dl-2 promulgated under the Exchange Act within five (5) days of the date that
the Company is notified (orally or in writing, whichever is earlier) by the
Commission that a Registration Statement will not be "reviewed," or not subject
to further review, or (III) the Registration Statement is filed with and
declared effective by the Commission but thereafter ceases to be effective as to
all Registrable Securities at any time prior to the expiration of the
Effectiveness Period, without being succeeded by a subsequent Registration
Statement filed with and declared effective by the Commission, or (IV) trading
in the Common Stock shall be suspended for any reason for more than three (3)
Business Days in the aggregate, or (V) the Company has breached Section 3(n) of
this Agreement (any such failure or breach being referred to as an "Event"), the
                                                                    -----
Company shall pay in cash as liquidated damages for such failure and not as a
penalty (the "Liquidated Damages") to each Holder an amount equal to 2% of the
              ------------------
aggregate purchase price of all of the Registrable Securities then held by such
Holder for each thirty (30) day period following such Event until the applicable
Event has been cured, which amount shall be pro rated for any periods less than
thirty (30) days (the "Periodic Amount"). Payments to be made pursuant to this
                       ---------------
Section 7(e) shall be due and payable immediately upon demand at the option of
the Holders in cash. The parties agree that the Periodic Amount represents a
reasonable estimate on the part of the parties, as of the date of this
Agreement, of the amount of damages that may be incurred by the Holders if the
Registration Statement is not filed on or prior to the Filing Date or has not
been declared effective by the Commission on or prior to the Effectiveness Date
and maintained in the manner contemplated herein during the Effectiveness Period
or if any other Event as described herein has occurred.

          (e)   Specific Enforcement, Consent to Jurisdiction.
                ---------------------------------------------

                (i)   The Company and the Holders acknowledge and agree that
irreparable damage would occur in the event that any of the provisions of this
Registration

                                      -14-
<PAGE>

Rights Agreement or the Purchase Agreement were not performed in accordance with
their specific terms or were otherwise breached. It is accordingly agreed that
the parties shall be entitled to enforce specifically the terms and provisions
of the Registration Rights Agreement or the Purchase Agreement; provided,
                                                                --------
however, that with respect to any provision with respect to which the Buyer
-------
entitled to receive Liquidated Damages, the sole remedy of the Buyer will be to
enforce specifically its right to receive such Liquidated Damages.

               (ii)   Both the Company and the Purchaser (i) hereby irrevocably
submits to the jurisdiction of the United States District Court for the Southern
District of New York and the courts of the State of New York located in New York
county for the purposes of any suit, action or proceeding arising out of or
relating to this Agreement or the Purchase Agreement and (ii) hereby waives, and
agrees not to assert in any such suit, action or proceeding, any claim that it
is not personally subject to the jurisdiction of such court, that the suit,
action or proceeding is brought in an inconvenient forum or that the venue of
the suit, action or proceeding is improper. Both the Company and the Purchaser
consents to process being served in any such suit, action or proceeding by
mailing a copy thereof to such party at the address in effect for notices to it
under this Agreement and agrees that such service shall constitute good and
sufficient service of process and notice thereof. Nothing in this Section 7(f)
shall affect or limit any right to serve process in any other manner permitted
by law.

          (f)  Amendments and Waivers. The provisions of this Agreement,
               ----------------------
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and each of the Holders. Notwithstanding the foregoing, a waiver or consent to
depart from the provisions hereof with respect to a matter that relates
exclusively to the rights of Holders and that does not directly or indirectly
affect the rights of other Holders may be given by Holders of at least a
majority of the Registrable Securities to which such waiver or consent relates;
provided, however, that the provisions of this sentence may not be amended,
--------  -------
modified, or supplemented except in accordance with the provisions of the
immediately preceding sentence.

          (g)  Notices. Any and all notices or other communications or
               -------
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed to have been duly given: when delivered by hand, if
personally delivered; when receipt is acknowledged, if telecopied; or when
actually received or refused if sent by other means.

               (x)   if to the Company:

                     Myriad Genetics Inc.
                     320 Wakara Way
                     Salt Lake City, Utah 84108
                     Tel. No.: (801) 584-3600
                     Fax No.: (801) 584-3640
                     Attn: President

                     with a copy to:

                                      -15-
<PAGE>

                     Lewis J. Geffen, Esq.
                     Mintz Levin Cohn Ferris Glovsky and Popeo PC
                     One Financial Center
                     Boston, Massachusetts 02111
                     Tel. No.: (617) 542-6000
                     Fax No.:  (617) 542-2241

               (y)   if to the Purchaser:

                     Acqua Wellington North American Equities Fund, Ltd.
                     c/o Fortis Fund Services (Bahamas) Ltd.
                     Montague Sterling Centre
                     East Bay Street, P. O. Box SS-6238
                     Nassau, Bahamas
                     Tel. No.: (242) 394-2700
                     Fax No.: (242) 394-9667
                     Attention:  Anthony L.M. Inder Rieden

or to such other address or addresses or facsimile number or numbers as any such
party may most recently have designated in writing to the other parties hereto
by such notice.

          (h)  Successors and Assigns. This Agreement shall be binding upon and
               ----------------------
inure to the benefit of the parties and their successors and permitted assigns
and shall inure to the benefit of each Holder and its successors and assigns.
The Company may not assign this Agreement or any of its rights or obligations
hereunder without the prior written consent of each Holder which consent will
not be unreasonably withheld. Each Purchaser may assign its rights hereunder in
the manner and to the Persons as permitted under the Purchase Agreement.

          (i)  Assignment of Registration Rights. The rights of each Holder
               ---------------------------------
hereunder, including the right to have the Company register for resale
Registrable Securities in accordance with the terms of this Agreement, shall be
automatically assignable by each Holder to any transferee of such Holder of all
or at least 50,000 shares of Registrable Securities if: (i) the Holder agrees in
writing with the transferee or assignee to assign such rights, and a copy of
such agreement is furnished to the Company within a reasonable time after such
assignment, (ii) the Company is, within a reasonable time after such transfer or
assignment, furnished with written notice of (a) the name and address of such
transferee or assignee, and (b) the securities with respect to which such
registration rights are being transferred or assigned, (iii) following such
transfer or assignment the further disposition of such securities by the
transferee or assignees is restricted under the Securities Act and applicable
state securities laws, (iv) at or before the time the Company receives the
written notice contemplated by clause (ii) of this Section, the transferee or
assignee agrees in writing (in form and substance reasonably satisfactory to the
Company) with the Company to be bound by all of the provisions of this
Agreement, and (v) such transfer shall have been made in accordance with the
applicable requirements of the Purchase Agreement. In addition, each Holder
shall have the right to assign its rights hereunder to any other Person with the
prior written consent of the Company, which consent shall not be

                                      -16-
<PAGE>

unreasonably withheld. The rights to assignment shall apply to the Holders (and
to subsequent) successors and assigns.

          (j)  Counterparts. This Agreement may be executed in any number of
               ------------
counterparts, each of which when so executed shall be deemed to be an original
and, all of which taken together shall constitute one and the same Agreement. In
the event that any signature is delivered by facsimile transmission, such
signature shall create a valid binding obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

          (k)  Governing Law. This Agreement shall be governed by and construed
               -------------
in accordance with the laws of the State of New York, without regard to
principles of conflicts of law thereof. This Agreement shall not be interpreted
or construed with any presumption against the party causing this Agreement to be
drafted.

          (l)  Severability. If any term, provision, covenant or restriction of
               ------------
this Agreement is held to be invalid, illegal, void or unenforceable in any
respect, the remainder of the terms, provisions, covenants and restrictions set
forth herein shall remain in full force and effect and shall in no way be
affected, impaired or invalidated, and the parties hereto shall use their
reasonable efforts to find and employ an alternative means to achieve the same
or substantially the same result as that contemplated by such term, provision,
covenant or restriction. It is hereby stipulated and declared to be the
intention of the parties that they would have executed the remaining terms,
provisions, covenants and restrictions without including any of such that may be
hereafter declared invalid, illegal, void or unenforceable.

          (m)  Headings.  The headings herein are for convenience only, do not
               --------
not shall not be deemed to limit or affect any of the provisions hereof.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                      -17-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Registration
Rights Agreement to be duly executed by their respective authorized persons as
of the date first indicated above.

                            MYRIAD GENETICS INC.

                            By: /s/ Jay M. Moyes
                                ------------------------------------------------
                                Name: Jay M. Moyes
                                Title: Chief Financial Officer, V.P. Finance

                            ACQUA WELLINGTON NORTH AMERICAN EQUITIES FUND, LTD.

                            By: /s/ Anthony L.M. Inder Rieden
                                ------------------------------------------------
                                Name: Anthony L.M. Inder Rieden
                                Title:  Director

                                      -18-
<PAGE>

                                                                   EXHIBIT 10.66

                                                                       EXHIBIT A

                        FORM OF NOTICE OF EFFECTIVENESS
                           OF REGISTRATION STATEMENT

[TRANSFER AGENT]
[ADDRESS]
Attn:  _________

               Re:      Myriad Genetics Inc.
                        --------------------

Ladies and Gentlemen:

     We are counsel to Myriad Genetics Inc., a Delaware corporation (the
"Company"), and have represented the Company in connection with that certain
Common Stock Purchase Agreement (the "Purchase Agreement"), dated as of August
28, 2000, by and between the Company and the Purchaser named therein pursuant to
which the Company issued to the Purchaser shares (the "Common Stock") of its
Common Stock, no par value (the "Common Stock"). Pursuant to the Purchase
Agreement, the Company has also entered into a Registration Rights Agreement
with the Purchaser (the "Registration Rights Agreement"), dated as of August 28,
2000, pursuant to which the Company agreed, among other things, to register the
Registrable Securities (as defined in the Registration Rights Agreement),
including the Common Stock, under the Securities Act of 1933, as amended (the
"1933 Act"). In connection with the Company's obligations under the Registration
Rights Agreement, on ________________, 2000, the Company filed a Registration
Statement on Form ___ (File No. 333-________) (the "Registration Statement")
with the Securities and Exchange Commission (the "SEC") relating to the resale
of the Registrable Securities which names each of the present Holders as a
selling stockholder thereunder.

     In connection with the foregoing, we advise you that a member of the SEC's
staff has advised us by telephone that the SEC has entered an order declaring
the Registration Statement effective under the 1933 Act at [ENTER TIME OF
EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge that
any stop order suspending its effectiveness has been issued or that any
proceedings for that purpose are pending before, or threatened by, the SEC and,
accordingly, the Registrable Securities are available for resale under the 1933
Act in the manner specified in, and pursuant to the terms of the Registration
Statement for so long as such Registration Statement remains effective and
current.

                                              Very truly yours,

                                              By:

cc:      Acqua Wellington North American Equities, Ltd.

                                      -19-

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