Document:

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                                                                   Exhibit 10.2

                           INVESTORS RIGHTS AGREEMENT

         INVESTORS RIGHTS AGREEMENT (this "Agreement") is dated as of May 23,
2000 by and among (i) Beacon Power Corporation, a Delaware corporation (the
"COMPANY"), (ii) the stockholders of the Company who are listed on Schedule A
hereto (each, a "SCHEDULE A STOCKHOLDER" and collectively, the "SCHEDULE A
STOCKHOLDERS"), and (iii) the other stockholders of the Company listed on
Schedule B hereto (each, an "INVESTOR" and collectively, the "INVESTORS"). The
Schedule A Stockholders and the Investors are collectively referred to herein as
the "STOCKHOLDERS" and individually as a "STOCKHOLDER". Certain terms used in
this Agreement are defined in EXHIBIT A hereto.

                                 R E C I T A L S
                                 ---------------

         A. Each of the Investors has made an investment in the Company by
acquiring shares of the Company's capital stock (the "SHARES").

         B. In consideration of the investment made in the Company by each of
the Investors, the Schedule A Stockholders and the Company have agreed to enter
into this Agreement and to grant to the Investors the rights set forth herein.

                                    AGREEMENT
                                    ---------

         NOW, THEREFORE, in consideration of the foregoing and of the mutual
promises and covenants contained herein, the Stockholders and the Company (each
a "PARTY" and collectively, the "PARTIES") agree as follows:

1.       BOARD OF DIRECTORS REPRESENTATION

         1.1. REPRESENTATION. From and after the date hereof, each Stockholder
shall vote all of the voting securities of the Company over which such
Stockholder has voting control so as to effect the following:

              (a) Subject to clause (c) below, the authorized number of
directors of the Company's Board of Directors (the "BOARD") shall be established
at seven members.

              (b) The following Persons shall be elected to the Board at each
election of directors during the term of this Agreement:

                   (i) two Persons designated by Perseus Capital, L.L.C.
("PERSEUS");

                   (ii) one Person designated by DQE Enterprises, Inc.
("DUQUESNE");

                   (iii) subject to Section 1.3 herein, one Person designated by
GE Capital Equity Investments, Inc. ("GE");

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                   (iv) one Person designated by Mechanical Technologies
Incorporated ("MTI");

                   (v) one Person designated by SatCon Technology Corporation
("SATCON"); and

                   (vi) William Stanton for as long as he remains the Chief
Executive Officer of the Company or, if Mr. Stanton ceases to be the Chief
Executive Officer of the Company, one Person jointly chosen by SatCon and
Perseus.

The Persons elected to the Board pursuant to clauses (i) through (iv) are
referred to herein as the "INVESTOR REPRESENTATIVES".

              (c) At any time, any Person designated to serve on the Board
hereunder may be removed from the Board (and thereupon from all committees
thereof) with or without cause, at the written request of the Stockholder (or
Stockholders) that designated such director in accordance herewith.

              (d) In the event that any Person designated to serve on the Board
hereunder for any reason ceases to serve as a director of the Board or any
committee thereof during such director's term of office, the resulting vacancy
on the Board or any Committees shall be filled by a Person designated by the
Stockholder (or Stockholders) that designated the director vacating the office
in accordance herewith.

              (e) In the event (i) the Company breaches in any material respect
any of its covenants or agreements under the Securities Purchase Agreement dated
as of May 23, 2000 by and among the Company, Perseus, Duquesne, Micro-Generation
Technology Fund, L.L.C. ("MICRO"), GE, MTI, Penske Corporation and the Beacon
Group Energy Investment Fund, L.P. ("Beacon Fund") (the "CLASS F AGREEMENT") or
any Related Agreement (as defined in the Class F Agreement) and fails to cure
such breach within 30 days after the delivery of a written notice to the Company
describing such breach in reasonable detail, (ii) it becomes known that any of
the representations and warranties of the Company contained in the Class F
Agreement were not true and correct in all material respects as the date of the
Closing (as defined in the Class F Agreement) and such inaccuracy is not cured
within 30 days after the delivery of a written notice to the Company describing
such inaccuracy in reasonable detail, (iii) the Company fails to redeem any
shares of its Class F Preferred Stock as required by the Company's Certificate
of Incorporation (as then in effect) at the time such redemption is required
(including without limitation any failure to redeem that is based on a lack of
legally available funds or any other legal or contractual prohibition or
restriction upon redemption), or (iv) the Company or any of its subsidiaries
becomes the subject of any proceeding under the Bankruptcy Code or any similar
statute (whether voluntarily or involuntarily), then upon the occurrence of any
such event the Board shall be increased by two additional members who shall be
designated by holders of a majority of the outstanding shares of the Company's
Class F Preferred Stock. To the extent any cure of a breach by the Company
described in clause (i) or (ii) of the immediately preceding sentence would not
cure any adverse effect resulting from such initial breach, no cure

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period shall be deemed to be available to the Company with respect to such
breach. Such increase in the size of the Board shall continue in effect until
the breach or inaccuracy referenced in clause (i) or (ii) has been fully cured,
the redemption referenced in clause (iii) has been fully effected, or the
proceeding referenced in clause (iv) has been dismissed, as the case may be.

         1.2. ANNUAL BUDGET. At least 15 days prior to the beginning of each
fiscal year, the Board shall, with the approval of a majority of the Investor
Representatives, approve and adopt a budget for the Company for such fiscal year
(in each case, an "Annual Budget").

         1.3. OBSERVER RIGHTS. For so long as Micro holds any capital stock of
the Company, the Company shall invite a representative from Micro to attend all
meetings of the Board, at the Company's expense, in a nonvoting observer
capacity. For so long as Beacon Fund holds at least 5% of the capital stock of
the Company, on a fully diluted basis, the Company shall invite a representative
from Beacon Fund to attend all meetings of the Board, at the Company's expense,
in a nonvoting observer capacity. GE may, at its sole discretion, elect to have
a representative attend meetings of the Board as an observer in lieu of
designating a director pursuant to Section 1.1(b)(iii) above. The Company shall
provide all such representatives with the same financial and other information
that is provided to the members of the Board in connection with any meetings of
the Board. As a condition of the observer rights granted in this Section, each
of Micro, Beacon Fund and GE agrees to abide by the Company's insider trading
rules to the extent they are applicable to all members of the Board, and each
such representatives of Micro, Beacon Fund and GE shall agree to abide by the
Company's insider trading rules to the extent they are applicable to all members
of the Board.

         1.4 RESTRICTIONS ON SALES BY MANAGEMENT. Except for transfers to Family
Members, the Company shall prohibit each of its officers and other members of
the Company's management team who hold in excess of 100,000 shares on a fully
diluted basis from transferring any shares of capital stock of the Company
without the Company first obtaining the affirmative vote of at least a
two-thirds majority of the holders of Class F Preferred Stock, provided such
two-thirds majority must consist of at least two holders of Class F Preferred
Stock.

2.       REGISTRATION RIGHTS

         2.1. DEFINITIONS. For purposes of this Section 2:

              "Commencement Date" means the 180th day after the date on which
the first of the following events occurs: (i) the Company consummates its
initial public offering of securities under the Securities Act, (ii) the company
registers a class of securities under Section 12(b) or 12(g) of the Exchange Act
or (iii) the Company becomes required to file periodic reports with the
Commission under Section 15(d) of the Exchange Act.

              "Commission" means the Securities and Exchange Commission or any
successor thereto.

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              "Exchange Act" means the Securities Exchange Act of 1934, as
amended, or any successor statute.

              "Holder" means (i) an Investor, (ii) the partners, members or
stockholders of an Investor collectively provided that such partners, members or
stockholders act through such Investor or its successor and (iii) any person or
entity to whom an Investor or any person or entity identified in clause (ii) of
this definition sells, transfers or assigns Registrable Securities, other than
in a sale pursuant to Rule 144 under the Securities Act or a registration
effected pursuant to this Agreement.

              "Majority-In-Interest" means Holders of a majority of the
Registrable Securities.

              "Register," "registered," and "registration" refer to an
underwritten registration effected by preparing and filing with the Commission a
registration statement or similar document in compliance with the Securities
Act, and the declaration or ordering by the Commission of effectiveness of such
registration statement or document.

              "Registration Expenses" means all expenses in connection with the
Company's performance of or compliance with its obligations under this Section
2, including, without limitation, all (i) registration, qualification and filing
fees; (ii) fees, costs and expenses of compliance with securities or blue sky
laws (including reasonable fees, expenses and disbursements of counsel for the
underwriters in connection with blue sky qualifications of the Registrable
Securities under the laws of such jurisdictions as the managing underwriter or
underwriters in a registration may designate, subject to the limitation as set
forth in subsection (h) of Section 2.5 hereof); (iii) printing expenses; (iv)
messenger, telephone and delivery expenses; (v) fees, expenses and disbursements
of counsel for the Company and of all independent certified public accountants
retained by the Company (including the expenses of any special audit and "cold
comfort" letters required by or incident to such performance); (vi) Securities
Act liability insurance if the Company so desires; (vii) fees, expenses and
disbursements of any other individuals or entities retained by the Company in
connection with the registration of the Registrable Securities; (viii) fees,
costs and expenses incurred in connection with the listing of the Registrable
Securities on each national securities exchange or automated quotation system on
which the Company has made application for the listing of its Common Stock; and
(ix) internal expenses of the Company (including, without limitation, all
salaries and expenses of its officers and employees performing legal or
accounting duties and expenses of any annual audit). Registration Expenses shall
not include selling commissions, discounts or other compensation paid to
underwriters or other agents or brokers to effect the sale of Registrable
Securities, or counsel fees and any other expenses incurred by Holders in
connection with any registration that are not specified in the immediately
preceding sentence.

              "Registrable Securities" means any shares of Common Stock of the
Company owned by any Holder or that may be acquired by any Holder upon the
conversion of any convertible security or the exercise or conversion of any
warrant, option or similar right owned by any Holder, but only to the extent
such shares constitute "restricted securities" under Rule 144 under the
Securities Act. Notwithstanding the

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foregoing, (i) until such time as all Registrable Securities held by Holders
other than SatCon have been sold pursuant to Rule 144 under the Securities Act
or a registration effected pursuant to this Agreement, securities held by SatCon
and its Affiliates shall not exceed, in the aggregate, 20% of the total
Registrable Securities held by all Investors and (ii) no shares of Common Stock
of the Company owned by any Schedule A Stockholder (other than SatCon) shall
constitute Registrable Securities for purposes of Section 2.2 hereof.

              "Requestor" means the Holder or Holders that request the
registration in question.

              "Securities Act" means the Securities Act of 1933, as amended, or
any successor statute.

         2.2. DEMAND REGISTRATIONS.

              (a) REQUEST FOR REGISTRATION. If at any time on or after the
Commencement Date, the Majority-In-Interest with respect to any registration to
be effected on a Form S-1 (or any successor long form) or any Holder with
respect to any registration to be effected on a form other than a Form S-1 (or
any successor long form) submits a written request (a "Demand Notice") to the
Company that the Company register Registrable Securities under and in accordance
with the Securities Act (a "Demand Registration"), then the Company shall:

                   (i) within five days after receipt of such Demand Notice,
give written notice of the proposed registration to all other Holders; and

                   (ii) as soon as practicable, use best efforts to effect such
registration as may be so requested and as would permit or facilitate the sale
and distribution of all or such portion of such Registrable Securities as are
specified in such request, together with all or such portion of the Registrable
Securities of any Holders joining in such request as are specified in written
requests received by the Company within 20 days after the date the Company mails
the written notice referred to in clause (i) above.

         Notwithstanding the foregoing, if the Company shall furnish to the
Holders a certificate signed by the president of the Company stating that in the
good faith judgment of the Board, it would be seriously detrimental to the
Company or its stockholders for a registration statement to be filed on or
before the date filing would be required in connection with any Demand
Registration and it is therefore essential to defer the filing of such
registration statement, the Company shall have the right to defer such filing or
delay its effectiveness for a reasonable period not to exceed 60 days provided
that such right shall not be exercised more than once with respect to a request
for registration hereunder during any period of twelve consecutive months. The
Company will pay all Registration Expenses in connection with such withdrawn
request for registration.

         Notwithstanding the foregoing, the Company shall not be required to
effect (i) more than two registrations on any form other than a Form S-3 (or any
successor short

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form), (ii) any registration where the anticipated aggregate gross proceeds from
the sale of the Registrable Securities to be included in such registration is
less than $500,000, or (iii) any registration requested within less than six
months after the filing of another registration pursuant to this Section 2 in
which all of the Registrable Securities requested to be included in such
registration by participating Holders were so included.

              (b) UNDERWRITING. In connection with any registration under this
Section 2.2, if so requested by the Requestor, the Company shall enter into an
underwriting agreement with one or more underwriters selected by the Requestor
having terms and conditions customary for such agreements.

              (c) SHELF REGISTRATION. If at the time the Company registers
Registrable Securities under the Securities Act pursuant to this Section 2.2,
the sale or other disposition of such Registrable Securities by the Holders may
be made pursuant to a registration statement on Form S-3 (or any successor form
that permits the incorporation by reference of future filings by the Company
under the Exchange Act), such registration statement, unless otherwise directed
by the Requestor, shall be filed as a "shelf" registration statement pursuant to
Rule 415 under the Securities Act (or any successor rule). Any such shelf
registration shall cover the disposition of all Registrable Securities in one or
more underwritten offerings, block transactions, broker transactions, at-market
transactions and in such other manner or manners as may be specified by the
Requestor. The Company shall use its best efforts to keep such "shelf"
registration continuously effective as long as the delivery of a prospectus is
required under the Securities Act in connection with the disposition of the
Registrable Securities registered thereby and in furtherance of such obligation,
shall supplement or amend such registration statement if, as and when required
by the rules, regulations and instructions applicable to the form used by the
Company for such registration or by the Securities Act or by any other rules and
regulations thereunder applicable to shelf registrations. On one occasion during
each twelve consecutive months such shelf registration statement remains
effective, upon their receipt of a certificate signed by the president of the
Company in accordance with the last paragraph of Section 2.2(a) hereof, the
Holders will refrain from making any sales of Registrable Securities under the
shelf registration statement for a period of up to 60 days; provided that this
right to cause the Holders to refrain from making sales shall not be exercised
by the Company during the one year period following any exercise of the
Company's right to defer the filing or delay its effectiveness of a registration
statement under the penultimate paragraph of Section 2.2(a).

         2.3. COMPANY REGISTRATION.

              (a) NOTICE OF REGISTRATION. If at any time or from time to time,
the Company shall determine to register any of its Capital Stock, whether or not
for its own account, other than a registration relating to employee benefit
plans or a registration effected on Form S-4, the Company shall:

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                   (i) provide to each Holder written notice thereof at least
twenty days prior to the filing of the registration statement by the Company in
connection with such registration; and

                   (ii) include in such registration, and in any underwriting
involved therein, all those Registrable Securities specified in a written
request by each Holder received by the Company within fifteen days after the
Company mails the written notice referred to above, subject to the provisions of
Section 2.3(b) below.

              (b) UNDERWRITING. The right of any Holder to registration pursuant
to this Section 2.3 shall be conditioned upon the participation by such Holder
in the underwriting arrangements specified by the Company in connection with
such registration and the inclusion of the Registrable Securities of such Holder
in such underwriting to the extent provided herein. All Holders proposing to
distribute their Registrable Securities through such underwriting shall
(together with the Company) enter into an underwriting agreement in customary
form with the managing underwriter selected for such underwriting by the Company
and take all other actions, and deliver such opinions and certifications, as may
be reasonably requested by such managing underwriter. Notwithstanding any other
provision of this Section 2.3, if the managing underwriter determines that
marketing factors require a limitation of the number of shares to be
underwritten, the managing underwriter may limit the number of Registrable
Securities to be included in such registration. The Company shall so advise all
Holders distributing Registrable Securities through such underwriting, and there
shall be excluded from such registration and underwriting, to the extent
necessary to satisfy such limitation, first shares which the Company wishes to
register for the account of third parties, then shares held by the Holders and,
thereafter, to the extent necessary, shares which the Company wishes to register
for its own account. As among the Holders as a group, the number of Registrable
Securities that may be included in the registration and underwriting shall be
allocated in proportion, as nearly as practicable, to the respective amounts of
Registrable Securities required to be included (determined without regard to any
requirement of a request to be included in such registration) in such
registration held by all Holders at the time of filing the registration
statement. To facilitate the allocation of shares in accordance with the above
provisions, the Company may round the number of shares allocated to any Holder
to the nearest 100 shares.

              (c) RIGHT TO TERMINATE REGISTRATION. The Company shall have the
right to terminate or withdraw any registration initiated by it under this
Section 2.3 prior to the effectiveness of such registration whether or not any
Holder has elected to include Registrable Securities in such registration.

         2.4. EXPENSE OF REGISTRATION. All Registration Expenses incurred in
connection with the registration and other obligations of the Company pursuant
to Sections 2.2, 2.3 and 2.5 shall be borne by Company.

         2.5. REGISTRATION PROCEDURES. If and whenever the Company is required
by the provisions of this Section 2 to effect the registration of Registrable
Securities, the Company shall:

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              (a) promptly prepare and file with the Commission a registration
statement with respect to such Registrable Securities on any form that may be
utilized by the Company and that shall permit the disposition of the Registrable
Securities in accordance with the intended method or methods of disposition
thereof, and use its best efforts to cause such registration statement to become
effective as promptly as practicable and remain effective thereafter as provided
herein, provided that prior to filing a registration statement or prospectus or
any amendments or supplements thereto, including documents incorporated by
reference after the initial filing of any registration statement, the Company
will furnish to each of the Investors whose Registrable Securities are covered
by such registration statement, their counsel and the underwriters copies of all
such documents proposed to be filed sufficiently in advance of filing to provide
them with a reasonable opportunity to review such documents and comment thereon;

              (b) prepare and file with the Commission such amendments
(including post-effective amendments) and supplements to such registration
statement and the prospectus used in connection therewith as may be necessary to
keep such registration statement effective and current and to comply with the
provisions of the Securities Act with respect to the sale or other disposition
of all Registrable Securities covered by such registration statement, including
such amendments (including post-effective amendments) and supplements as may be
necessary to reflect the intended method of disposition by the prospective
seller or sellers of such Registrable Securities, provided that except in the
case of a shelf registration under Section 2.2(c) such registration statement
need not be kept effective and current for longer than 120 days subsequent to
the effective date of such registration statement;

              (c) provide customary indemnity and contribution arrangements to
any qualified independent underwriter or qualified independent pricer as defined
in Schedule E of the Bylaws of the National Association of Securities Dealers,
Inc. (a "Qualified Independent Underwriter/Pricer"), if requested by such
Qualified Independent Underwriter/Pricer, on such reasonable terms as such
Qualified Independent Underwriter/Pricer customarily requires;

              (d) subject to receiving reasonable assurances of confidentiality,
for a reasonable period after the filing of such registration statement, and
throughout each period during which the Company is required to keep a
registration effective, make available for inspection by the selling holders of
Registrable Securities being offered, and any underwriters, and their respective
counsel, such financial and other information and books and records of the
Company, and cause the officers, directors, employees, counsel and independent
certified public accountants of the Company to respond to such inquiries as
shall be reasonably necessary, in the judgment of such counsel, to conduct a
reasonable investigation within the meaning of Section 11 of the Securities Act;

              (e) promptly notify the selling holders of Registrable Securities
and any underwriters and confirm such advice in writing, (i) when such
registration statement or the prospectus included therein or any prospectus
amendment or supplement or post-effective amendment has been filed, and, with
respect to such registration statement

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or any post-effective amendment, when the same has become effective, (ii) of any
comments by the Commission, by the National Association of Securities Dealers
Inc. ("NASD"), and by the blue sky or securities commissioner or regulator of
any state with respect thereto or any request by any such entity for amendments
or supplements to such registration statement or prospectus or for additional
information, (iii) of the issuance by the Commission of any stop order
suspending the effectiveness of such registration statement or the initiation or
threatening of any proceedings for that purpose, (iv) if at any time the
representations and warranties of the Company cease to be true and correct in
all material respects, (v) of the receipt by the Company of any notification
with respect to the suspension of the qualification of the Registrable
Securities for sale in any jurisdiction or the initiation or threatening of any
proceeding for such purpose, or (vi) at any time when a prospectus is required
to be delivered under the Securities Act, that such registration statement,
prospectus, prospectus amendment or supplement or post-effective amendment, or
any document incorporated by reference in any of the foregoing, contains an
untrue statement of a material fact or omits to state any material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they are made, not misleading;

              (f) furnish to each selling holder of Registrable Securities being
offered, and any underwriters, prospectuses or amendments or supplements
thereto, in such quantities as they may reasonably request and as soon as
practicable, that update previous prospectuses or amendments or supplements
thereto;

              (g) permit selling holders of Registrable Securities to rely on
any representations and warranties made to any underwriter of the Company or any
opinion of counsel or "cold comfort" letter delivered to any such underwriter,
and indemnify each such holder to the same extent that it indemnifies any such
underwriter;

              (h) use best efforts to (i) register or qualify the Registrable
Securities to be included in a registration statement hereunder under such other
securities laws or blue sky laws of such jurisdictions within the United States
of America as any selling holder of such Registrable Securities or any
underwriter of the securities being sold shall reasonably request, (ii) keep
such registrations or qualifications in effect for so long as the registration
statement remains in effect and (iii) take any and all such actions as may be
reasonably necessary or advisable to enable such holder or underwriter to
consummate the disposition in such jurisdictions of such Registrable Securities
owned by such holder; PROVIDED, HOWEVER, that the Company shall not be required
for any such purpose to (x) qualify generally to do business as a foreign
corporation in any jurisdiction wherein it would not otherwise be required to
qualify but for the requirements of this Section 2.5(h), (y) subject itself to
taxation in any such jurisdiction or (z) consent to general service of process
in any such jurisdiction;

              (i) cause all such Registrable Securities to be listed or accepted
for quotation on each securities exchange or automated quotation system on which
the Company's Common Stock then trades;

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              (j) otherwise use best efforts to comply with all applicable
provisions of the Securities Act, and rules and regulations of the Commission,
and make available to its security holders, as soon as reasonably practicable,
an earnings statement covering a period of at least twelve months which shall
satisfy the provisions of Section 11(a) of the Securities Act and Rule 158
thereunder; and

              (k) provide a legal opinion of the Company's outside counsel,
dated the effective date of such registration statement (and, if such
registration statement includes an underwritten public offering, dated the date
of the closing under the underwriting agreement), with respect to the
registration statement, each amendment and supplement thereto, the prospectus
included therein (including the preliminary prospectus) and such other documents
relating thereto in customary form and covering such matters of the type
customarily covered by legal opinions of such nature.

         2.6. INDEMNIFICATION. In the event any of the Registrable Securities
are included in a registration statement under this Section 2:

              (a) the Company will indemnify each Holder who participates in
such registration, each of its officers and directors and partners and such
Holder's separate legal counsel and independent accountants, and each person
controlling such Holder within the meaning of Section 15 of the Securities Act,
and each underwriter, if any, and each person who controls any underwriter
within the meaning of Section 15 of the Securities Act, against all expenses,
claims, losses, damages or liabilities (or actions in respect thereof),
including any of the foregoing incurred in settlement of any litigation,
commenced or threatened, arising out of or based on any untrue statement (or
alleged untrue statement) of a material fact contained in any registration
statement, prospectus, offering circular or other document, or any amendment or
supplement thereto, incident to any such registration, qualification or
compliance, or based on any omission (or alleged omission) to state therein a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances in which they were made, not misleading,
or any violation by the Company of any rule or regulation promulgated under the
Securities Act applicable to the Company in connection with any such
registration, qualification or compliance, and the Company will reimburse each
such Holder, each of its officers and directors and partners and such Holder's
separate legal counsel and independent accountants and each person controlling
such Holder, each such underwriter and each person who controls any such
underwriter, for any legal and any other expenses reasonably incurred in
connection with investigating, preparing or defending any such claim, loss,
damage, liability or action, provided that the Company will not be liable in any
such case to the extent that any such claim, loss, damage, liability or expense
arises out of or is based on any untrue statement or omission or alleged untrue
statement or omission, made in reliance upon and in conformity with written
information furnished to the Company by an instrument duly executed by such
Holder or underwriter and stated to be specially for use therein.

              (b) Each Holder, severally and not jointly, will, if Registrable
Securities held by such Holder are included in the securities as to which such
registration, qualification or compliance is being effected, indemnify the
Company, each

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of its directors and officers and its legal counsel and independent accountants,
each underwriter, if any, of the Company's securities covered by such a
registration statement, each person who controls the Company or such underwriter
within the meaning of Section 15 of the Securities Act, and each other such
Holder, each of its officers and directors and each person controlling such
Holder within the meaning of Section 15 of the Securities Act, against all
claims, losses, damages and liabilities (or actions in respect thereof) arising
out of or based on any untrue statement (or alleged untrue statement) of a
material fact contained in any such registration statement, prospectus, offering
circular or other document, or any omission (or alleged omission) to state
therein a material fact required to be stated therein or necessary to make the
statement therein not misleading, and will reimburse the Company, such Holders,
such directors, officers, persons, underwriters or control persons for any legal
or any other expenses reasonably incurred in connection with investigating or
defending any such claim, loss, damage, liability or action, in each case to the
extent, but only to the extent, that such untrue statement (or alleged untrue
statement) or omission (or alleged omission) is made in such registration
statement, prospectus, offering circular or other document in reliance upon and
in conformity with written information furnished to the Company by an instrument
duly executed by such Holder and stated to be specifically for use therein.
Notwithstanding any other provision herein, each Holder's indemnification
obligations under this Section 2.6(b) shall be limited to an amount not to
exceed the net proceeds received by such Holder resulting from sales pursuant to
such registration statement, prospectus, offering circular or other document.

              (c) Each party entitled to indemnification under this Section 6
(the "Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified
Party has actual knowledge of any claim as to which indemnity may be sought
provided that failure to give such prompt notice shall not relieve the
Indemnifying Party of its obligations hereunder unless it is materially
prejudiced thereby, and shall permit the Indemnifying Party to assume the
defense of any such claim or any litigation resulting therefrom, provided
that counsel for the Indemnifying Party, who shall conduct the defense of
such claim or litigation, shall be approved by the Indemnified Party (whose
approval shall not unreasonably be withheld). Such Indemnified Party shall
have the right to employ separate counsel in any such action and to
participate in the defense thereof, but the fees and expenses of such counsel
shall be that of such Indemnified Party unless (i) the Indemnifying Party has
agreed to pay such fees and expenses or (ii) the Indemnifying Party shall
have failed to assume the defense of such action or proceeding and employ
counsel reasonably satisfactory to such Indemnified Party in any such action
or proceeding or (iii) the named parties to any such action or proceeding
(including any impleaded parties) include both such Indemnified Party and the
Indemnifying Party and such Indemnified Party shall have been advised by
counsel that there may be one or more legal defenses available to such
Indemnified Party which are different from or additional to those available
to the Indemnifying Party (in which case, if such Indemnified Party notifies
the Indemnifying Party in writing of an election to employ separate counsel
at the expense of the Indemnifying Party, the Indemnifying Party shall not
have the right to assume the defense of such action or proceeding on behalf
of such Indemnified Party, it being understood, however, that the
Indemnifying Party then shall have the right to employ

                                       11

<PAGE>

separate counsel at its own expense and to participate in the defense
thereof, and shall not, in connection with any one such action or proceeding
or separate but substantially similar or related actions or proceedings in
the same jurisdiction arising out of the same general allegations or
circumstances, be liable for the reasonable fees and expenses of more than
one separate firm of attorneys at any time for all Indemnified Parties, which
firm shall be designated in writing by a majority of the Indemnified Parties
who are eligible to select such counsel). No Indemnifying Party, in the
defense of any such claim or litigation, shall, except with the consent of
each Indemnified Party, consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving
by the claimant or plaintiff to such Indemnified Party of a release from all
liability in respect to such claim or litigation. No Indemnified Party may
consent to entry of any judgment or enter into any settlement without the
prior written consent of the Indemnifying Party.

              (d) If the indemnification provided for in this Section 2.6 is
held by a court of competent jurisdiction to be unavailable to an Indemnified
Party with respect to any loss, liability, claim, damage or expense referred to
herein, then the Indemnifying Party, in lieu of indemnifying the Indemnified
Party, shall contribute to the amount paid or payable by such Indemnified Party
with respect to such loss, liability, claim, damage or expenses in the
proportion that is appropriate to reflect the relative fault of the Indemnifying
Party and the Indemnified Party in connection with the statements or omissions
that resulted in such loss, liability, claim, damage, or expense, as well as any
other relevant equitable considerations. The relative fault of the Indemnifying
Party and the Indemnified Party shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of material fact or the
omission to state a material fact relates to information supplied by the
Indemnifying Party or by the Indemnified Party, and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. Notwithstanding any other provision herein, each
Holder's contribution obligations under this Section 2.6(d) shall be limited to
an amount not to exceed the net proceeds received by such Holder resulting from
sales pursuant to such registration statement, prospectus, offering circular or
other document.

         2.7. RULE 144 REPORTING. With a view to making available the benefits
of certain rules and regulations of the Commission which may at any time permit
the sale of the Registrable Securities to the public without registration, after
such time as a public market exists for the Common Stock, the Company shall use
reasonably diligent efforts to:

              (a) Make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, beginning 90 days
after the Company registers a class of securities under Section 12 of the
Exchange Act or completes a registered offering under the Securities Act; or

              (b) File with the Commission in a timely manner all reports and
other documents required of the Company under the Securities Act and the
Exchange Act (at any time after it has become subject to such reporting
requirements);

                                       12

<PAGE>

              (c) Furnish to any Holder promptly upon request a written
statement as to its compliance with the reporting requirements of Rule 144 (at
any time after 90 days after the Company completes a registered offering under
the Securities Act), and of the Securities Act and the Exchange Act (at any time
after it has become subject to such reporting requirements), a copy of the most
recent annual or quarterly report of the Company, and such other reports and
documents of the Company and other information in the possession of or
reasonably obtainable by the Company as a Holder may reasonably request in
availing itself of any rule or regulation of the Commission allowing a Holder to
sell Registrable Securities without registration.

         2.8. TERMINATION OF REGISTRATION RIGHTS. No Holder shall be entitled to
exercise any right provided for in this Section 2 after the earlier of (a) ten
years following the Commencement Date and (b) the date all Registrable
Securities held by such Holder may be sold in a single three-month period under
Rule 144 under the Securities Act.

         2.9. INFORMATION TO BE PROVIDED BY THE HOLDERS. Each Holder whose
Registrable Securities are included in any registration pursuant to this
Agreement shall furnish the Company such information regarding such Holder and
the distribution proposed by such Holder as may be reasonably requested in
writing by the Company and as shall be required in connection with such
registration or the registration or qualification of such securities under any
applicable state securities law.

         2.10. "STAND-OFF" AGREEMENT. Each Holder, if requested by the managing
underwriter of the initial public offering of securities by the Company, shall
agree not to sell or otherwise transfer or dispose of any Registrable Securities
or other securities of the Company then held by such Holder for a specified
period of time that is customary under the circumstances (not to exceed 180
days) following the effective date of the registration statement for such
offering; provided that (a) no such agreement shall be required unless the
officers, directors and any other stockholders holding at least 1% of the total
Common Share Equivalents enter into a similar agreement covering the same period
of time and (b) such agreement shall contain terms customary for such
agreements; and further provided, that if the managing underwriter agrees to
release any officer, director or stockholder holding at least 1% of the total
Common Share Equivalents (a "Released Holder") from its stand-off obligations
under this Section 2.10, all other Holders shall be released from their
respective stand-off obligations and be allowed to participate, together with
such Released Holder, on a pro rata basis in such offering. The Company may
impose stop transfer instructions to enforce any required agreement of the
Holders under this Section 2.10.

3.       PURCHASE RIGHTS REGARDING FUTURE
         SALES OF CAPITAL SECURITIES BY THE COMPANY

         Subject to the terms and conditions specified in this Section 3, the
Company hereby grants to each Investor a purchase right with respect to future
sales by the Company of its Capital Securities (as hereinafter defined). Each
Investor shall be entitled to apportion the

                                       13

<PAGE>

purchase right hereby granted it among itself and its members, partners and
affiliates in such proportions as it deems appropriate. Each time the Company
proposes to offer any shares of, or any securities convertible into or
exercisable or exchangeable for any shares of, any class of its capital stock
(collectively, "Capital Securities"), the Company shall first make an offering
of such Capital Securities to each Investor in accordance with the following
provisions:

              (a) The Company shall deliver a notice by certified mail (a
"Company Sales Notice") to the Investors stating (i) its bona fide intention to
offer such Capital Securities, (ii) the number of such Capital Securities to be
offered, and (iii) the price and terms, if any, upon which it proposes to offer
such Capital Securities.

              (b) Within 20 Business Days after receipt of a Company Sales
Notice, each Investor that desires to purchase any of the Capital Securities
specified in such Company Sales Notice at the price and on the terms specified
in such Sales Notice shall provide to the Company a written notice (a "Company
Purchase Notice") setting forth the number of such Capital Securities such
Investor is willing to purchase. If the total number of Capital Securities
specified in all of the Company Purchase Notices received by the Company within
such period exceeds the total number of Capital Securities specified in such
Company Sales Notice or such greater number of Capital Securities that the
Company is willing to sell at the price and on the terms specified in such
Company Sales Notice, then the Capital Securities to be sold shall be allocated
among the Investors in the same proportion that each such Investor's Common
Share Equivalents bear to the total Common Share Equivalents owned by all of the
Investors that have delivered Company Purchase Notices; provided that if such
allocation would result in any Investor being allocated Capital Securities under
this subsection (b) in excess of the total number of Capital Securities that it
specified in its Purchase Notice, such excess Capital Securities shall be
allocated among the other Investors that have not been allocated Capital
Securities equal to the number of Capital Securities specified in their Company
Purchase Notices in a manner that results in such other Investors receiving in
the aggregate under this subsection (b) an equal percentage of the total number
of Capital Securities specified in their respective Company Purchase Notices.
All allocations made pursuant to this subsection (b) shall be rounded to the
nearest whole Capital Security. The Capital Securities allocated to each
Investor under this subsection (b) shall be purchased by such Investor at the
price and on the terms specified in the Company Sales Notice at a closing to be
held within 40 Business Days after the delivery of the Company Sales Notice.
Such date shall be specified by the Company in a written notice delivered to
each Investor participating in such sale at least 10 Business Days prior
thereto.

              (c) If all Capital Securities that the Investors are entitled to
purchase pursuant to Section 3(b) are not elected to be purchased as provided in
Section 3(b) hereof, the Company may, during the 120-day period following the
expiration of the period provided in Section 3(b) hereof, offer the remaining
unsubscribed portion of such Capital Securities to any Person or Persons at a
price not less than, and upon terms no more favorable to the offeree than, those
specified in the Company Sales Notice with respect thereto. If the Company does
not enter into an agreement for the sale of such Capital Securities within such
period, or if such agreement is not consummated within 30

                                       14

<PAGE>

days of the execution thereof, the right provided hereunder shall be deemed to
be revived and such Capital Securities shall not be offered unless first
reoffered to the Investors in accordance herewith.

              (d) The purchase right granted in this Section 3 shall not be
applicable (i) to the issuance or sale of Common Stock (or options therefor) to
consultants, officers, directors and employees for the primary purpose of
soliciting or retaining their employment or services in a transaction or
pursuant to a plan approved by the Board, (ii) as part of or after a Qualified
Initial Public Offering, (iii) the issuance of securities pursuant to the
conversion or exercise of outstanding convertible securities or warrants,
options or similar rights, (iv) the issuance of securities in connection with a
bona fide business acquisition by the Company, whether by merger, consolidation,
sale of assets, sale or exchange of stock or otherwise, (v) the issuance of
warrants, options or similar securities to a bank or other institutional lender
as consideration for the extension of credit by such lender to the Company, or
(vi) the issuance of stock, warrants or other securities or rights to persons or
entities with which the Company has business relationships provided such
issuances are for other than primarily equity financing purposes and provided
that at the time of any such issuance, the aggregate of such issuance and
similar issuances in the preceding twelve-month period do not exceed 2% of the
then outstanding Common Stock of the Company (assuming full conversion and
exercise of all convertible and exercisable securities then outstanding) or such
issuance is expressly approved by a majority of the director representatives of
the Investors on the Board.

4.       INFORMATION AND INSPECTION RIGHTS

         4.1 INFORMATION. The Company shall deliver to each Investor for so long
as such Investor (together with and any Persons whose securities are aggregated
with those of such Investor pursuant to Section 8.9 hereof for purposes of the
Agreement) holds 500,000 Common Share Equivalents:

              (a) as soon as practicable, but in any event within 120 days after
the end of each fiscal year of the Company, an income statement of the Company
for such fiscal year, a cash flow statement of the Company for such fiscal year,
and a balance sheet of the Company as of the end of such fiscal year, with each
such financial statement to be in reasonable detail, prepared in accordance
GAAP, and audited and certified by a firm of independent public accountants of
nationally recognized standing selected by the Company;

              (b) as soon as practicable, but in any event within sixty days
after the end of each of the first three quarters of each fiscal year of the
Company, unaudited statements of income and cash flows of the Company for such
fiscal quarter and an unaudited balance sheet of the Company as of the end of
such fiscal quarter;

                                       15

<PAGE>

              (c) within thirty days of the end of each calendar month,
unaudited statements of income and cash flows and balance sheet of the Company
for and as of the end of such month, in reasonable detail;

              (d) as soon as practicable, but in any event at least thirty days
prior to the end of each fiscal year, a budget and business plan of the Company
for the next fiscal year, prepared on a monthly basis, including balance sheets
and statements of cash flows for such months and, as soon as prepared, any other
budgets or revised budgets prepared by the Company;

              (e) with respect to the financial statements called for in
subsections (b) and (c) of this Section 4.1, an instrument executed by the Chief
Financial Officer or President of the Company certifying that such financial
statements were prepared in accordance with GAAP consistently applied with prior
practice for earlier periods (with the exception of footnotes that may be
required by GAAP) and fairly present the financial condition of the Company and
its results of operation, cash flows and changes in shareholders' equity for the
period specified, subject to year-end audit adjustments; and

              (f) such other information relating to the financial condition,
business, prospects or corporate affairs of the Company as such Investor may
from time to time request.

         4.2. INSPECTION. During any period in which a Investor is entitled to
receive the materials specified in Section 4.1 hereof, the Company shall permit
such Investor, at such Investor's expense, to visit and inspect the Company's
properties during normal business hours and upon reasonable prior notice, to
examine its books of account and records and to discuss the Company's affairs,
finances and accounts with its officers and accountants, all at such reasonable
times and upon reasonable notice as may be requested by such Investor.

5.       RIGHT OF FIRST OFFER

         5.1. NOTICE. In the event any Schedule A Stockholder (a "Selling
Stockholder") desires to sell, transfer or otherwise dispose of any or all of
the shares of capital stock of the Company owned of record or beneficially by
such Stockholder or any securities ultimately convertible into or exercisable
for any such shares of capital stock (collectively, the "Target Shares"), such
Selling Stockholder shall promptly deliver to the Company and the Investors, a
written notice of such intended disposition (a "Disposition Notice") setting
forth the proposed terms and conditions thereof, including the number and type
of securities to be disposed of, any conditions to such disposition, the
proposed timing of such disposition, and the minimum consideration such Selling
Stockholder will accept in payment for such securities. Except as otherwise
provided herein, a Schedule A Stockholder may not sell, transfer or otherwise
dispose of any shares of capital stock of the Company or any securities
ultimately convertible into or exercisable for such

                                       16

<PAGE>

shares of capital stock unless it delivers to the Company and the Investors a
Disposition Notice and complies with the provisions of this Section 5.1 or
unless the proposed sale, transfer or disposition is exempt under Section 5.6
hereof from the right of first offer granted herein.

         5.2. THE COMPANY'S RIGHT. The Company shall, for a period of thirty
days following receipt of a Disposition Notice, have the right to purchase the
Target Shares specified therein upon the terms and conditions specified in the
Disposition Notice, subject to the conditions contained in this Section 5.2.
Such right shall be exercisable by written notice (the "Exercise Notice")
delivered to the Selling Stockholder and the Investors prior to the expiration
of such thirty-day exercise period. If such right is exercised with respect to
all of the Target Shares specified in the Disposition Notice, then the Company
shall complete the repurchase of such Target Shares, by no later than twenty
Business Days after the delivery of the Exercise Notice. At such time, the
Selling Stockholder shall deliver to the Company the certificates representing
the Target Shares to be repurchased, each certificate to be properly endorsed
for transfer. Alternatively, if such right is exercised with respect to only a
portion of the Target Shares specified in the Disposition Notice, then such
right to repurchase shall be contingent upon the election of one or more of the
Investors to repurchase the remaining Target Shares. The Company shall notify
the Investors of its intent to repurchase only a portion of the Target Shares
within the thirty-day exercise period above defined. In such event, the
Company's repurchase of such Target Shares shall be consummated, if at all, at
the time of the Investors' exercise of its repurchase rights in accordance with
Section 5.3 hereof. In the event one or more of the Investors do not elect to
repurchase the remaining Target Shares, the Company shall be deemed to have
waived its right under this Section 5.2.

         5.3. THE INVESTORS' RIGHT. Subject to the rights of the Company under
Section 5.2 hereof, for a period of the shorter of (i) thirty days from receipt
of the Disposition Notice and (ii) fifteen days from receipt of written notice
of the Company's election either to waive its purchase right or to repurchase
only a portion of the Target Shares, each of the Investors shall have the right
to purchase all of the Target Shares if the Company has elected to waive its
right, or all or a portion of the remaining balance of the Target Shares after
the Company has elected to repurchase only a portion thereof, upon the terms and
conditions specified in the Disposition Notice. The Investors shall exercise
such right in the same manner and subject to the same rights and conditions as
the Company, as more specifically set forth in paragraph 5.2 above. To the
extent that the Target Shares need to be allocated among the Investors, they
shall be allocated PRO RATA based on the holdings of Common Share Equivalents of
each Investor that desires to exercise its purchase right.

         5.4. NON-EXERCISE OF PURCHASE RIGHT. In the event an Exercise Notice
with respect to any portion of the Target Shares is not given to the Selling
Stockholder by the Company or any of the Investors within the period specified
herein following the date of the Company's and the Investors' receipt of the
Disposition Notice, then subject to compliance with the provisions of Section
5.5 hereof, the Selling Stockholder shall have a period of 120 days thereafter
in which to sell the Target Shares upon terms and conditions (including the
purchase price) no more favorable to the acquirer than those

                                       17

<PAGE>

specified in the Disposition Notice. It shall be a condition to any such
disposition that the acquiror agree to be bound by and comply with all of the
provisions of this Agreement applicable to such Selling Stockholder with respect
to such Target Shares. In the event the Selling Stockholder does not consummate
the sale or disposition of the Target Shares within such 120 day period, the
Company's and the Investors' purchase rights shall continue to be applicable to
any subsequent disposition of the Target Shares by the Selling Stockholder until
such right terminates in accordance with Section 8.1 hereof.

         5.5. EXEMPT TRANSFERS. Notwithstanding the foregoing, the purchase
rights of the Company and the Investors set forth in this Section 5 shall not
apply to any transfer by a Selling Stockholder to (a) the ancestors,
descendants, siblings or spouse of the Selling Stockholder or to trusts for the
benefit of such persons or the Selling Stockholder, (b) to such Selling
Stockholder's Affiliates, or (c) in the case of a Selling Stockholder that is a
private investment company, to the partners, members, stockholders or other
investors of such Selling Stockholders as a distribution or similar transfer
from such Selling Stockholder; provided that in each of the foregoing cases, the
transferee shall furnish the Investors and the Company with a written agreement
to be bound by and comply with all provisions of this Agreement. Such
transferred stock shall remain subject to the provisions of this Agreement, and
such transferee shall be treated as a "Stockholder" (and a transferee of a
Schedule A Stockholder shall be treated as a "Schedule A Stockholder") for the
purposes of this Agreement.

         5.6 ADDITIONAL RESTRICTION ON DISPOSITIONS BY MANAGEMENT. No Schedule A
Stockholder who is an officer or employee of the Company as of the date hereof
or becomes an officer or employee of the Company after the date hereof shall
sell or otherwise dispose of any shares of the capital stock of the Company
without the prior approval of a majority of the Investor Representatives on the
Board.

6.       CO-SALE RIGHTS

         6.1. NOTICE. In the event an Investor that holds at least 2,500,000
Common Share Equivalents or a Schedule A Stockholder (a "Selling Major
Stockholder") desires to accept a bona fide offer from a financially capable
acquiror for the sale, transfer or other disposition of any or all of the shares
of capital stock of the Company owned of record or beneficially by such Selling
Major Stockholder or any securities ultimately convertible into or exercisable
for any such shares of capital stock (collectively, the "Sale Shares"), such
Selling Major Stockholder shall promptly deliver to the Company and the other
Stockholders, a written notice of such intended disposition (a "Sale Notice")
setting forth the terms and conditions thereof, including the number and type of
securities to be disposed of, any conditions to such disposition, the proposed
timing of such disposition, the consideration to be paid for such securities and
the identity of the proposed acquirer. Except as otherwise provided herein, a
Selling Major Stockholder may not sell, transfer or otherwise dispose of any
shares of capital stock of the Company or any securities ultimately convertible
into or exercisable for such shares of capital stock unless it delivers to the
Company and the Stockholders a Sales Notice and complies with the

                                       18

<PAGE>

provisions of this Section 6 or unless the proposed sale, transfer or
disposition is exempt under Section 6.6 hereof from the co-sale rights granted
herein.

         6.2. GRANT OF CO-SALE RIGHTS. Each Stockholder (other than the Selling
Major Stockholder) shall have the right, exercisable upon written notice to the
Selling Major Stockholder within thirty days after receipt of the Selling Major
Stockholder's Sale Notice, to participate in such sale of the Sale Shares on the
same terms and conditions as those set forth in the Sale Notice. To the extent
any other Stockholder exercises such right of participation (a "Participating
Stockholder"), the number of shares of Sale Shares that the Selling Major
Stockholder may sell in the transaction shall be correspondingly reduced. The
right of participation of each Stockholder shall be subject to the terms and
conditions set forth in this Section 6.2.

              (a) Each Participating Stockholder and the Selling Major
Stockholder shall be deemed to own the number of shares of Common Stock that it
actually owns plus the number of shares of Common Stock that are issuable upon
conversion of any convertible securities of the Company or upon the exercise of
any warrants, options or similar rights then owned by it at an exercise price
less than the purchase price specified in the Sale Notice.

              (b) Each Participating Stockholder may sell all or any part of a
number of Sale Shares equal to the product obtained by multiplying (i) the
aggregate number of Sale Shares by (ii) a fraction, the numerator of which is
the number of shares of Common Stock of the Company deemed to be owned by such
Participating Stockholder and the denominator of which is the total number of
outstanding shares of Common Stock of the Company deemed to be owned by the
Selling Major Stockholder and all Participating Stockholders.

              (c) Each Participating Stockholder may effect its participation in
the sale by delivering to the Selling Major Stockholder for transfer to the
acquirer one or more certificates, properly endorsed for transfer, which
represent:

                   (i) the number of shares that it elects to sell pursuant to
this Section 6.2;

                   (ii) that number of shares of convertible securities of the
Company that is at such time convertible into the number of shares of Common
Stock that it has elected to sell pursuant to this Section 6.2; provided,
however, that if the acquirer objects to the delivery of convertible securities
of the Company in lieu of Common Stock, the Participating Stockholder may, to
the extent permitted by the terms of such security, convert and deliver Common
Stock as provided in subparagraph (i) above; or

                   (iii) a combination of the foregoing that in the aggregate
represents the number of shares of Common Stock to be sold by the Participating
Stockholder.

                                       19

<PAGE>

         6.3. PAYMENT OF PROCEEDS. The stock certificates that the Participating
Stockholders deliver to the Selling Major Stockholder pursuant to Section 6.2
shall be transferred by the Selling Major Stockholder to the acquirer in
consummation of the sale of the Sale Shares pursuant to the terms and conditions
specified in the Sale Notice, and the Selling Major Stockholder shall promptly
thereafter remit to the Participating Stockholders that portion of the sale
proceeds to which such Participating Stockholder is entitled by reason of its
participation in such sale.

         6.4. NON-EXERCISE. The exercise or non-exercise of the rights of the
Participating Stockholders hereunder to participate in one or more sales of Sale
Shares made by the Selling Major Stockholder shall not adversely affect its
right to participate in subsequent sales by the Selling Major Stockholder. In
the event none of the Stockholders elect to exercise their co-sale rights
hereunder with respect to a disposition, the Selling Major Stockholder that sent
the Sale Notice regarding such disposition may consummate such disposition in
accordance with the terms specified in the Sale Notice but only within 90 days
after the expiration of the Stockholders' co-sale rights.

         6.5. PROHIBITED TRANSFERS. In the event a Major Stockholder should sell
any Sale Shares of the Company in contravention of the co-sale rights of any
other Stockholder under this Agreement (a "Prohibited Transfer"), such other
Stockholder shall have the option to sell to the Selling Major Stockholder a
number of shares of Common Stock of the Company (either directly or through
delivery of convertible securities) equal to the number of shares that such
other Stockholder would have been entitled to sell had such Prohibited Transfer
been effected in accordance with Section 6.2 hereof, on the following terms and
conditions:

              (a) The price per share at which the shares are to be sold to the
Selling Major Stockholder shall be equal to the price per share paid to the
Selling Major Stockholder by the third-party acquiror or acquirer of the Selling
Major Stockholder's Sale Shares in the disposition referenced in the Sale
Notice.

              (b) The other Stockholder shall deliver to the Selling Major
Stockholder, within 30 days after it has received notice from the Selling Major
Stockholder or otherwise become aware of the Prohibited Transfer, the
certificate or certificates representing shares to be sold, each certificate to
be properly endorsed for transfer.

              (c) The Selling Major Stockholder shall, upon receipt of the
certificates for the repurchased shares, pay the aggregate purchase price
therefor, by certified check or bank draft made payable to the order of such
other Stockholder, and shall reimburse the other Stockholder for any additional
expenses reasonably incurred, including reasonable legal fees and expenses,
incurred in effecting such purchase and resale.

         6.6. EXEMPT TRANSFERS. The provisions of this Section 6 shall not apply
(a) a sale of any stock to the Company including pursuant to the exercise by the
Company of its purchase right under Section 5.1 hereof or (b) any transfer by a
Selling Major

                                       20

<PAGE>

Stockholder to (i) the ancestors, descendants, siblings or spouse of the Selling
Major Stockholder or to trusts for the benefit of such persons or the Selling
Major Stockholder, (ii) to such Selling Major Stockholder's Affiliates, or (iii)
in the case of a Selling Major Stockholder that is a private investment company,
to the partners, members, stockholders or other investors of such Selling Major
Stockholders as a distribution or similar transfer from such Selling Major
Stockholder; provided that in each of the foregoing cases in this clause (b),
the transferee shall furnish the Stockholders and the Company with a written
agreement to be bound by and comply with all provisions of this Agreement. Such
transferred stock shall remain subject to the provisions of this Agreement, and
such transferee shall be treated as a "Stockholder" (and a transferee of a
Schedule A Stockholder shall be treated as a "Schedule A Stockholder") for the
purposes of this Agreement.

7.       LEGEND REQUIREMENTS

         7.1. LEGEND. Each certificate representing the shares of capital stock
(or securities convertible into or exercisable for shares of capital stock) of
the Company owned by the Stockholders shall be endorsed with the following
legend:

         "THE SALE OR TRANSFER, THE VOTING AND CERTAIN OTHER RIGHTS RELATING TO
         THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE TERMS
         AND CONDITIONS OF A CERTAIN INVESTOR RIGHTS AGREEMENT BY AND AMONG THE
         COMPANY AND CERTAIN STOCKHOLDERS OF THE COMPANY. A COPY OF SUCH
         AGREEMENT IS ON FILE AT THE PRINCIPAL OFFICE OF THE COMPANY."

         7.2. REMOVAL. The legend set forth in Section 7.1 hereof shall be
removed upon termination of this Agreement in accordance with the provisions of
Section 8.1.

8.       MISCELLANEOUS PROVISIONS

         8.1. TERMINATION. Except as otherwise provided herein, the rights and
obligations of the Company and the Stockholder under this Agreement (other than
Section 2 hereof) shall terminate as to any specific Stockholder at such time as
such Stockholder shall no longer own shares of Common Stock or securities of the
Company convertible or exercisable for shares of Common Stock that equal or
represent the right to acquire, in the aggregate, at least 500,000 shares of
Common Stock (subject to appropriate adjustment in the case of any stock
dividend, stock split or other recapitalization or similar transaction). Unless
sooner terminated in accordance with the preceding sentence, this Agreement
(other than Section 2 hereof) shall terminate immediately upon the earlier of
(a) the closing of a Qualified Initial Public Offering, (b) the closing of the
Company's sale of all or substantially all of its assets for a purchase price of
at least $200 million or the acquisition of the Company by another entity by
means of a merger or consolidation resulting in the exchange of the outstanding
shares of

                                       21

<PAGE>

the Company's outstanding stock for securities or consideration issued, or
caused to be issued, by the acquiring entity or its subsidiary, or (c) the
execution by the Company of a general assignment for the benefit of creditors or
the appointment of a receiver or trustee to take possession of the property and
assets of the Company.

         8.2. NOTICES. All notices, requests and other communications hereunder
shall be in writing and shall be deemed to have been duly given at the time of
receipt if delivered by hand or by facsimile transmission or three days after
being mailed, registered or certified mail, return receipt requested, with
postage prepaid, to the following address or facsimile number (as the case may
be): for the Company, the address or facsimile number listed below the signature
of the Company on the Company's signature page hereto for each Stockholder, the
address or facsimile number specified for such Stockholder on SCHEDULE A or B
hereto if any Party shall have designated a different address or facsimile
number by notice to the other Parties given as provided above, then to the last
address or facsimile number so designated.

         8.3. SEVERABILITY. In the event one or more of the provisions of this
Agreement should, for any reason, be held to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability
shall not affect any other provisions of this Agreement, and this Agreement
shall be construed and interpreted in such manner as to be effective and valid
under applicable law.

         8.4. WAIVER OR MODIFICATION. Any amendment or modification of this
Agreement shall be effective only if evidenced by a written instrument executed
by the Company and by Investors that hold a two-thirds majority of the total
Common Share Equivalents held by all of the Investors; provided, that to the
extent any such amendment or modification would adversely affect any class of
securities issued by the Company, such amendment or modification shall only be
effective upon the affirmative vote of a majority of such class, voting as a
class.

         8.5. GOVERNING LAW. This Agreement shall be governed by and construed
in accordance with the laws of the State of Delaware without regard to the
principles of conflicts of laws thereof. Each of the parties hereto hereby
waives any right to trial by jury in any action, suit or proceeding that may
arise out of or relate to this Agreement, any Related Agreement or any of the
transactions contemplated by this Agreement or any Related Agreement, whether
the matter asserted in such action, suit or proceeding is grounded in tort,
contract or otherwise.

         8.6. ATTORNEYS' FEES. In the event of any dispute involving the terms
hereof, the prevailing parties shall be entitled to collect legal fees and
expenses from the other party to the dispute.

         8.7. FURTHER ASSURANCES. Each Party agrees to act in accordance
herewith and not to take any action that is designed to avoid the intention
hereof.

         8.8. PERMITTED TRANSFEREES. Nothing in this Agreement shall be deemed
to prohibit an Investor from transferring any of its Registrable Securities to
its affiliates,

                                       22

<PAGE>

partners, members or stockholders provided that such transfers are made in
accordance with the securities registration requirements of the Securities Act
and any applicable state securities laws, or pursuant to an exemption from such
registration requirements.

         8.9. SUCCESSORS AND ASSIGNS. This Agreement and the rights and
obligations of the Parties hereunder shall inure to the benefit of, and be
binding upon, their respective successors, assigns and legal representatives.
Each Stockholder may assign its rights hereunder to (i) any transferee of Shares
held by such Stockholder that holds, in the aggregate, at least 500,000 Common
Share Equivalents after such transfer, (ii) the ancestors, descendants, siblings
or spouse of such Stockholder or to trusts for the benefit of such persons or
such Stockholder, (iii) to such Stockholder's Affiliates, or (iv) in the case of
a Stockholder that is a private investment company, to the partners, members,
stockholders or other investors of such Selling Major Stockholders as a
distribution or similar transfer from such Selling Major Stockholder; provided
that in each of the foregoing cases, the transferee shall furnish the other
Stockholders and the Company with a written agreement to be bound by and comply
with all provisions of this Agreement. Such transferee shall be treated as a
"Stockholder" (and a transferee of a Schedule A Stockholder shall be treated as
a "Schedule A Stockholder") for the purposes of this Agreement.

         8.10. AGGREGATION OF STOCK. For purposes of determining the
availability of any rights under this Agreement, the number of shares of Common
Stock or other securities of the Company deemed to be owned by a Stockholder or
other Person shall include all such shares or other securities owned by such
Stockholder or other Person, such Stockholder's (or other Person's) Affiliates
and their respective partners, members, or shareholders, and any other person or
entity that acquires any such shares or other securities from any of the
foregoing by gift, will or intestate succession.

         8.11. NONSOLICITATION. During the period beginning on the date hereof
and ending on the third anniversary hereof (the "NONSOLICITATION PERIOD") the
Company shall not, nor shall the Company permit any of its officers, directors,
employees, agents or other representatives to, directly or indirectly, without
prior written consent of GE, (i) actively solicit any employee of, or (ii)
actively solicit any employee who, within the six months prior to the date of
such solicitation or hiring, had been an employee of, GE, GE Capital Equity
Capital Group, Inc. or GE Capital Structured Finance Group, Inc. It is
understood that generic advertising shall not constitute "active solicitation"
for purposes of this Section 8.11. GE may seek injunctive relief to prevent any
such violations during the Nonsolicitation Period and also may seek monetary
damages in respect of any violations of this Section 8.11.

         8.12 TERMINATION OF CERTAIN OTHER RIGHTS. Upon the execution and
delivery of this Agreement, the Stockholders and the Company shall waive and
forever release all rights they may have under the following provisions of
certain prior agreements regarding the Company: (a) Sections 7.1, 7.3, 7.4, 7.5
and 7.6 of the Securities Purchase Agreement, dated October 23, 1998, by and
among the Company and certain of the Purchasers (the "CLASS D AGREEMENT"), (b)
all prior registration rights granted by the Company under any previous
agreement with the Company (including without limitation

                                       23

<PAGE>

Exhibit F to the Class D Agreement and the Registration Rights Agreement dated
as of April 7, 2000 by and among the Company, Perseus, Duquesne, Micro and
SatCon), (c) Sections 6.1, 6.2, 6.3 and 6.4 of the Securities Purchase
Agreement, dated April 7, 2000, relating to the Class E Preferred Stock and (d)
Sections 1 through 4, 5.1, 5.2 and 6 the Shareholders Agreement dated as of
October 23, 1998 by and among the Company, Perseus, Duquesne, Micro and SatCon.

                            [Company Signature page]

         IN WITNESS WHEREOF, the undersigned Stockholder has executed this
Agreement as of the day and year first above written.

                                      BEACON POWER CORPORATION

                                      By: /s/ William E. Stanton
                                         --------------------------------------
                                      Name: William E. Stanton
                                           ------------------------------------
                                      Title: President
                                            -----------------------------------

                                      ADDRESS FOR NOTICE:

                                       Beacon Power Corporation
                                      -----------------------------------------
                                       6D Gill Street
                                      -----------------------------------------
                                       Woburn, MA 01801
                                      -----------------------------------------
                                      Facsimile No.: (781) 938-9401
                                                   ----------------------------
                                      Attn: Chief Executive Officer
                                           ------------------------------------

                                      With a copy to:

                                       Edwards & Angell, LLP
                                      -----------------------------------------
                                       101 Federal Street
                                      -----------------------------------------
                                       Boston, MA 02110
                                      -----------------------------------------
                                      Facsimile No.: (617) 439-4170
                                                   ----------------------------
                                      Attn: Albert L. Sokol, Esq.
                                           ------------------------------------

                                       24

<PAGE>

                     [Schedule A Stockholder Signature page]

         IN WITNESS WHEREOF, the undersigned Schedule A Stockholder has executed
this Agreement as of the day and year first above written.

                                  Signature:

                                  /s/ James S. Bezreh
                                  ---------------------------------------------
                                  James S. Bezreh

                                  Signature:

                                  /s/ Russel S. Jackson
                                  ---------------------------------------------
                                  Russel S. Jackson

                                  Signature:

                                  /s/ Russell A. Kelley
                                  ---------------------------------------------
                                  Russell A. Kelley

                                  Signature:

                                  /s/ Stephen J. O'Connor
                                  ---------------------------------------------
                                  Stephen J. O'Connor

                                  Signature

                                  /s/ Jane E. O'Sullivan
                                  ---------------------------------------------
                                  Jane E. O'Sullivan

                                  Signature:

                                  /s/ Robert G. Wilkinson
                                  ---------------------------------------------
                                  Robert G. Wilkinson

                                  SATCON TECHNOLOGY CORP.

                                   By: /s/ Sean F. Moran
                                      -----------------------------------------
                                   Name: Sean F. Moran
                                        ---------------------------------------
                                   Title: Vice President of Finance,
                                          Chief Financial Officer and Treasurer
                                          -------------------------------------

                                       25

<PAGE>

         IN WITNESS WHEREOF, the undersigned Investor has executed this
Agreement as of the date and year first written above.

                                   PERSEUS CAPITAL, L.L.C.

                                   By: /s/ Philip J. Deutch
                                      -----------------------------------------
                                   Name: Philip J. Deutch
                                        ---------------------------------------
                                   Title: Managing Director
                                         --------------------------------------

                                   DQE ENTERPRISES, INC.

                                   By: /s/ Eric R. Stoltz
                                      -----------------------------------------
                                   Name: Eric R. Stoltz
                                        ---------------------------------------
                                   Title: Vice President and Treasurer
                                         --------------------------------------

                                   MICRO-GENERATION
                                   TECHNOLOGY FUND, L.L.C.

                                   BY ARETE CORPORATION,
                                   ITS MANAGER

                                   By: /s/ Robert W. Shaw, Jr.
                                      -----------------------------------------
                                       Robert W. Shaw, Jr.
                                       President

<PAGE>

                                   GE CAPITAL EQUITY INVESTMENTS, INC.

                                   By:     /s/ Hans Kobler
                                      -----------------------------------------
                                   Name:       Hans Kobler
                                        ---------------------------------------
                                   Title:      Vice President
                                         --------------------------------------

                                   MECHANICAL TECHNOLOGY, INC.

                                   By: /s/ Catherine S. Hill
                                      -----------------------------------------
                                   Name: Catherine S. Hill
                                        ---------------------------------------
                                   Title: Vice President
                                         --------------------------------------

                                   PENSKE CORPORATION

                                   By: /s/ Peter E. Mogk
                                      -----------------------------------------
                                   Name: Peter E. Mogk
                                        ---------------------------------------
                                   Title: Vice President and Treasurer
                                         --------------------------------------

                                   THE BEACON GROUP ENERGY
                                   INVESTMENT FUND II, L.P.

                                   By: Beacon Energy Investors II, L.P.,
                                       its general partner,

                                   By: /s/ Richard Aube
                                      -----------------------------------------
                                          Authorized Signatory

                                       2

<PAGE>

                                   SATCON TECHNOLOGY CORP.

                                   By: /s/ Sean F. Moran
                                      -----------------------------------------
                                   Name: Sean F. Moran
                                        ---------------------------------------
                                   Title: Vice President of Finance,
                                          Chief Financial Officer and Treasurer
                                         --------------------------------------

                                       3

<PAGE>

                                    EXHIBIT A

                               CERTAIN DEFINITIONS

         For purposes of the Agreement to which this Exhibit A is attached, the
following terms have the following meanings:

         "Affiliate" of any Person (the "Subject Person") means any Person that
Controls, is Controlled by or is under common Control with the Subject Person.

          "Business Day" means any day other than a Saturday, Sunday or other
day on which the national or state banks located in the District of Columbia,
State of New York or the State of Massachusetts are authorized to be closed.

          "Common Share Equivalents" means all shares of Common Stock that are
issued and outstanding or are issuable upon the exchange, exercise or conversion
of any other security of the Company. The number of Common Share Equivalents
owned by a Person shall equal the sum of the number of shares of Common Stock
owned by such Person plus the number of shares of Common Stock issuable upon the
exchange, exercise or conversion of any other security of the Company owned by
such Person.

         "Common Stock" means the common stock, par value $0.01 per share, of
the Company.

         "Control" and derivatives thereof mean the power to control the
management and policies of the Controlled Person where by ownership of voting
securities, contract or otherwise.

         "Family Members" means, as applied to any individual, such individual's
spouse, children (including stepchildren or adopted children), grandchildren,
parents, siblings, nieces, nephews or any spouse of any of the foregoing, and
any trust created solely for estate planning purposes for the exclusive benefit
of any one or more of them.

         "GAAP" means United States generally accepted accounting principles
consistently applied.

         "Person" means any individual, entity or governmental body.

         "Qualified Initial Public Offering" means a public offering of Common
Stock pursuant to an effective registration statement under the Securities Act
of 1933, as amended, that is underwritten by one or more nationally recognized
investment banking firms or a syndicate managed or co-managed by one or more
nationally recognized investment banking firms that results in the Company
receiving at least $30 million in gross proceeds and the Common Stock being
traded on the New York Stock Exchange or the Nasdaq National Market and that is
made at an initial public offering price that reflects a market capitalization
value of at least $200 million.

<PAGE>

                                   SCHEDULE A

                          SatCon Technology Corporation

                                 James S. Bezreh

                                Russel S. Jackson

                                Russell A. Kelley

                               Stephen J. O'Connor

                               Jane E. O'Sullivan

                               Robert G. Wilkinson

                                       2

<PAGE>

                                   SCHEDULE B

                             Perseus Capital, L.L.C.

                              DQE Enterprises, Inc.

                    Micro-Generation Technology Fund, L.L.C.

                       GE Capital Equity Investments, Inc.

                           Mechanical Technology, Inc.

                               Penske Corporation

                The Beacon Group Energy Investment Fund II, L.P.

                             SatCon Technology Corp.

                                       3<PAGE>

                                                                    Exhibit 10.3

                           FOURTH AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION

                                       OF

                            BEACON POWER CORPORATION

         The name of the Corporation is Beacon Power Corporation. The
Corporation was originally incorporated on May 8, 1997 pursuant to Sections 242
and 245 of the General Corporation Law of the State of Delaware. This Fourth
Amended and Restated Certificate of Incorporation of Beacon Power Corporation
was proposed and declared advisable by the Board of Directors of the Corporation
on May 23, 2000 and was consented to in writing by the Corporation's
stockholders as of May 23, 2000, in accordance with Sections 228, 242 and 245 of
the General Corporation Law of the State of Delaware. The Corporation's
Certificate of Incorporation is hereby amended and restated in its entirety to
read as follows:

         FIRST:  The name of the Corporation is Beacon Power Corporation.

         SECOND: The address of its registered office in the State of Delaware
is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington,
County of New Castle. The name of its registered agent at such address is The
Corporation Trust Company.

         THIRD: The nature of the business or purposes to be conducted or
promoted by the Corporation is as follows:

         To engage in any lawful act or activity for which corporations may be
organized under the General Corporation Law of Delaware.

         FOURTH: The total number of shares of all classes of stock which the
Corporation shall have authority to issue is (i) 30,000,000 shares of common
stock, $0.01 par value per share ("Common Stock") and (ii) 21,500,007 shares of
preferred stock, $0.01 par value per share (the "Preferred Stock"), of which
6,000,000 shares have been designated as Class A Preferred Stock ("Class A
Preferred Stock"), one share has been designated as Class B Preferred Stock
("Class B Preferred Stock"), six shares have been designated as Class C
Preferred Stock ("Class C Preferred Stock"), 6,000,000 shares have been
designated as Class D Preferred Stock ("Class D Preferred Stock"), 2,000,000
shares have been designated as Class E Preferred Stock ("Class E Preferred
Stock") and 7,500,000 shares have been designated as Class F Preferred Stock
("Class F Preferred Stock").

         The following is a statement of the designations and the powers,
privileges and rights, and the qualifications, limitations or restrictions
thereof in respect of each class of capital stock of the Corporation.

<PAGE>

A.       COMMON STOCK.

         1. GENERAL. The voting, dividend and liquidation rights of the holders
of the Common stock are subject to and qualified by the rights of the holders of
the Preferred Stock of any series as may be designated by the Board of Directors
upon any issuance of the Preferred Stock of any series.

         2. VOTING. The holders of the Common Stock are entitled to one vote for
each share held at all meetings of stockholders (and written actions in lieu of
meetings). There shall be no cumulative voting.

         3. DIVIDENDS. Dividends may be declared and paid on the Common Stock
from funds lawfully available therefor as and when determined by the Board of
Directors and subject to any preferential dividend rights of any then
outstanding Preferred Stock.

         4. LIQUIDATION. Upon the dissolution or liquidation of the Corporation,
whether voluntary or involuntary, holders of Common Stock will be entitled to
receive all assets of the Corporation available for distribution to its
stockholders, subject to any preferential rights of any then outstanding
Preferred Stock.

B.       PREFERRED STOCK.

         Preferred Stock may be issued from time to time in one or more classes,
each of such classes to have such terms as stated or expressed herein and in the
resolution or resolutions providing for the issue of such classes adopted by the
Board of Directors of the Corporation as hereinafter provided. Any shares of
Preferred Stock which may be redeemed, purchased or acquired by the Corporation
may be reissued except as otherwise provided by law or this Restated
Certificate. Different classes of Preferred Stock shall not be construed to
constitute different classes of shares for the purposes of voting by classes
unless expressly provided.

         Authority is hereby expressly granted to the Board of Directors from
time to time to issue the Preferred Stock in one or more classes, and in
connection with the creation of any such classes, by resolution or resolutions
providing for the issue of the shares thereof, to determine and fix such voting
powers, full or limited, or no voting powers, and such designations, preferences
and relative participating, optional or other special rights, and
qualifications, limitations or restrictions thereof, including without
limitation thereof, dividend rights, special voting rights, conversion rights,
redemption privileges and liquidation preferences, as shall be stated and
expressed in such resolutions, all to the full extent now or hereafter permitted
by the General Corporation Law of Delaware. Without limiting the generality of
the foregoing, the resolutions providing for issuance of any classes of
Preferred Stock may provide that such classes shall be superior or rank equally
or be junior to the Preferred Stock of any other classes to the extent permitted
by law, subject to the rights of any existing classes to approve any classes of
preferred stock ranking senior or on parity therewith. Except as otherwise
specifically provided in this Restated Certificate of Incorporation, no vote of
the holders of the Preferred Stock or Common Stock shall be a prerequisite to
the issuance of any shares of any classes of the

                                      -2-

<PAGE>

Preferred Stock authorized by and complying with the conditions of this Restated
Certificate of Incorporation, the right to have such vote being expressly waived
by all present and future holders of the capital stock of the Corporation. All
voting by shareholders shall be by majority vote unless otherwise specifically
provided herein.

C.       CLASS A PREFERRED STOCK.

         The Class A Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. DIVIDENDS. The Corporation shall not declare or pay any
distributions (as defined below) on shares of Common Stock unless the
Corporation simultaneously declares or pays to the holders of the Class A
Preferred Stock then outstanding a distribution on each outstanding share of
Class A Preferred Stock in an amount equal to the product of (i) the per share
amount, if any, of the dividends or other distributions to be declared, paid or
set aside for the Common Stock, multiplied by (ii) the number of whole shares of
Common Stock into which such share of Class A Preferred Stock is then
convertible. For purposes of this Section 1, unless the context requires
otherwise, "distribution" shall mean the transfer of cash or property without
consideration, whether by way of dividend or otherwise, payable other than in
Common Stock or other securities of the Corporation, or the purchase or
redemption of shares of the Corporation (other than (i) repurchases of Common
Stock held by employees or directors of, or consultants to, the Corporation upon
termination of their employment or services pursuant to agreements providing for
such repurchase at a price equal to the original issue price of such shares (ii)
repurchases pursuant to the Investors Rights Agreement, dated as of May 23,
2000, by and among the Corporation and holders of its capital stock, and (iii)
redemptions in liquidation or dissolution of the Corporation) for cash or
property, including any such transfer, purchase or redemption by a subsidiary of
this Corporation.

         2. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Corporation, the holders of shares of Class A
Preferred Stock then outstanding shall be entitled to be paid out of the assets
of the Corporation available for distribution to its stockholders, after and
subject to the payment in full of all amounts required to be distributed to the
holders of any other class or series of stock of the Corporation ranking on
liquidation prior and in preference to the Class A Preferred Stock, but before
any payment shall be made to the holders of Common Stock or any other class or
series of stock ranking on liquidation junior to the Class A Preferred Stock by
reason of their ownership thereof, an amount equal to $4.45 per share (subject
to appropriate adjustment in the event of any stock dividend, stock split,
combination or other similar recapitalization affecting such shares), plus any
dividends declared but unpaid thereon. If upon any such liquidation, dissolution
or winding up of the Corporation the remaining assets of the Corporation
available for distribution to its stockholders shall be insufficient to pay the
holders of shares of Class A Preferred Stock the full amount to which they shall
be entitled, the holders of shares of Class A Preferred Stock, Class B Preferred
Stock and any class or series of stock ranking on liquidation on a parity with
the Class A

                                      -3-

<PAGE>

Preferred Stock shall share ratably in any distribution of the remaining assets
and funds of the Corporation in proportion to the respective amounts which would
otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full.

              b. After the payment of all preferential amounts required to be
paid to the holders of Preferred Stock that is senior to Class A Preferred
Stock, the Class A Preferred Stock and Preferred Stock that is on a parity with
Class A Preferred Stock, upon the dissolution, liquidation or winding up of the
Corporation, the holders of shares of Common Stock and any other class of stock
then outstanding that ranks junior to Class A Preferred Stock upon liquidation
shall be entitled to receive the remaining assets and funds of the Corporation
available for distribution to its stockholders.

         3. VOTING. The Class A Preferred Stock shall not be entitled to any
voting rights.

         4. OPTIONAL CONVERSION. The holders of the Class A Preferred Stock
shall have conversion rights as follows (the "Conversion Rights"):

              a. RIGHT TO CONVERT. Each share of Class A Preferred Stock shall
be convertible, at the option of the holder thereof, at any time, and without
the payment of additional consideration by the holder thereof, into such number
of fully paid and nonassessable shares of Common Stock as is determined by
dividing $5.00 by the Conversion Price (as defined below) in effect at the time
of conversion. The "Conversion Price" shall initially be $5.00. Such initial
Conversion Price, and the rate at which shares of Class A Preferred Stock may be
converted into shares of Common Stock, shall be subject to adjustment as
provided below.

         In the event of a liquidation of the Corporation, the Conversion Rights
shall terminate at the close of business on the day immediately preceding the
date fixed for the payment of any amounts distributable on liquidation to the
holders of Class A Preferred Stock.

              b. FRACTIONAL SHARES. No fractional shares of Common Stock shall
be issued upon conversion of the Class A Preferred Stock. In lieu of any
fractional shares to which the holder would otherwise be entitled, the
Corporation shall pay cash equal to such fraction multiplied by the then
effective Conversion Price.

              c. MECHANICS OF CONVERSION.

                   (i) In order for a holder of Class A Preferred Stock to
convert shares of Class A Preferred Stock into shares of Common Stock, such
holder shall surrender the certificate or certificates for such shares of Class
A Preferred Stock, at the office of the transfer agent for the Class A Preferred
Stock (or at the principal office of the Corporation if the Corporation serves
as its own transfer agent), together with written notice that such holder elects
to convert all or any number of the shares of the Class A Preferred Stock
represented by such certificate or certificates. Such notice shall state such
holder's name or the names of the nominees in which such holder wishes the
certificate or certificates for shares of Common Stock to be issued. If required
by the

                                      -4-

<PAGE>

Corporation, certificates surrendered for conversion shall be endorsed or
accompanied by a written instrument or instruments of transfer, in form
satisfactory to the Corporation, duly executed by the registered holder or his
or its attorney duly authorized in writing. The date of receipt of such
certificates and notice by the transfer agent (or by the Corporation if the
Corporation serves as its own transfer agent) shall be the conversion date
("Conversion Date"). The Corporation shall, as soon as practicable after the
Conversion Date, issue and deliver at such office to such holder of Class A
Preferred Stock, or to his or its nominees, a certificate or certificates for
the number of shares of Common Stock to which such holder shall be entitled,
together with cash in lieu of any fraction of a share.

                   (ii) The Corporation shall at all times when the Class A
Preferred Stock shall be outstanding, reserve and keep available out of its
authorized but unissued stock for the purpose of effecting the conversion of the
Class A Preferred Stock, such number of its duly authorized shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding Class A Preferred Stock. Before taking any action which would cause
an adjustment reducing the Conversion Price below the then par value of the
shares of Common Stock issuable upon conversion of the Class A Preferred Stock,
the Corporation will take any corporate action which may, in the opinion of its
counsel, be necessary in order that the Corporation may validly and legally
issue fully paid and nonassessable shares of Common Stock at such adjusted
Conversion Price.

                   (iii) Upon any such conversion, no adjustment to the
Conversion Price shall be made for any declared but unpaid dividends on the
Class A Preferred Stock surrendered for conversion or on the Common Stock
delivered upon conversion.

                   (iv) All shares of Class A Preferred Stock which shall have
been surrendered for conversion as herein provided shall no longer be deemed to
be outstanding and all rights with respect to such shares, including the rights,
if any, to receive notices and to vote, shall immediately cease and terminate on
the Conversion Date, except only the right of the holders thereof to receive
shares of Common Stock in exchange therefor and payment of any dividends
declared but unpaid thereon. Any shares of Class A Preferred Stock so converted
shall be retired and cancelled and shall not be reissued, and the Corporation
(without the need for stockholder action) may from time to time take such
appropriate action as may be necessary to reduce the authorized Class A
Preferred Stock accordingly.

                   (v) The Corporation shall pay any and all issue and other
taxes that may be payable in respect of any issuance or delivery of shares of
Common Stock upon conversion of shares of Class A Preferred Stock pursuant to
this Section C.4. The Corporation shall not, however, be required to pay any tax
which may be payable in respect of any transfer involved in the issuance and
delivery of shares of Common Stock in a name other than that in which the shares
of Class A Preferred Stock so converted were registered, and no such issuance or
delivery shall be made unless and until the person or entity requesting such
issuance has paid to the Corporation the amount of

                                      -5-

<PAGE>

any such tax or has established, to the satisfaction of the Corporation, that
such tax has been paid.

              d. ADJUSTMENT FOR STOCK SPLITS AND COMBINATIONS. If the
Corporation shall at any time after the original date of issuance of the Class A
Preferred Stock effect a subdivision of the outstanding Common Stock, the
Conversion Price then in effect immediately before that subdivision shall be
proportionately decreased. If the Corporation shall at any time after the
original date of issuance of the Class A Preferred Stock combine the outstanding
shares of Common Stock, the Conversion Price then in effect immediately before
the combination shall be proportionately increased. Any adjustment under this
paragraph shall become effective at the close of business on the date the
subdivision or combination becomes effective.

              e. ADJUSTMENT FOR CERTAIN DIVIDENDS AND DISTRIBUTIONS. In the
event the Corporation at any time, after the original date of issuance of the
Class A Preferred Stock, shall make or issue, or fix a record date for the
determination of holders of Common Stock entitled to receive, a dividend or
other distribution payable in additional shares of Common Stock, then and in
each such event the Conversion Price for the Class A Preferred Stock then in
effect shall be decreased as of the time of such issuance or, in the event such
a record date shall have been fixed, as of the close of business on such record
date, by multiplying the Conversion Price for the Class A Preferred Stock then
in effect by a fraction:

                   (i) the numerator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date, and

                   (ii) the denominator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
PROVIDED, HOWEVER, if such record date shall have been fixed and such dividend
is not fully paid or if such distribution is not fully made on the date fixed
therefor, the Conversion Price for the Class A Preferred Stock shall be
recomputed accordingly as of the close of business on such record date and
thereafter the Conversion Price for the Class A Preferred Stock shall be
adjusted pursuant to this paragraph as of the time of actual payment of such
dividends or distributions; and PROVIDED FURTHER, HOWEVER, that no such
adjustment shall be made if the holders of Class A Preferred Stock
simultaneously receive a dividend or other distribution of shares of Common
Stock in a number equal to the number of shares of Common Stock as they would
have received if all outstanding shares of Class A Preferred Stock had been
converted into Common Stock on the date of such event.

              f. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. In the event
the Corporation at any time after the original date of issuance of the Class A
Preferred Stock shall make or issue, or fix a record date for the determination
of holders of Common Stock entitled to receive a dividend or other distribution
payable in securities of the Corporation, other than shares of Common Stock,
then and in each such event provision

                                      -6-

<PAGE>

shall be made so that the holders of the Class A Preferred Stock shall receive
upon conversion thereof in addition to the number of shares of Common Stock
receivable thereupon, the amount of securities of the Corporation that they
would have received had the Class A Preferred Stock been converted into Common
Stock on the date of such event and had they thereafter, during the period from
the date of such event to and including the conversion date, retained such
securities receivable by them as aforesaid during such period, giving
application to all adjustments called for during such period under this
paragraph with respect to the rights of the holders of the Class A Preferred
Stock; PROVIDED, HOWEVER, that no such adjustment shall be made if the holders
of Class A Preferred Stock simultaneously receive a dividend or other
distribution of such securities in an amount equal to the amount of such
securities as they would have received if all outstanding shares of Class A
Preferred Stock had been converted into Common Stock on the date of such event.

              g. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE, OR SUBSTITUTION. If
the Common Stock issuable upon the conversion of the Class A Preferred Stock
shall be changed into the same or a different number of shares of any class or
classes of stock, whether by capital reorganization, reclassification, or
otherwise (other than a subdivision or combination of shares or stock dividend
provided for above, or a reorganization, merger, consolidation, or sale of
assets provided for below), then and in each such event the holder of each such
shares of Class A Preferred Stock shall have the right thereafter to convert
such share into the kind and amount of shares of stock and other securities and
property receivable upon such reorganization, reclassification, or other change,
by holders of the number of shares of Common Stock into which such shares of
Class A Preferred Stock might have been converted immediately prior to such
reorganization, reclassification, or change, all subject to further adjustment
as provided herein.

              h. ADJUSTMENT FOR MERGER OR REORGANIZATION, ETC. In case of any
consolidation or merger of the Corporation with or into another corporation or
the sale of all or substantially all of the assets of the Corporation to another
corporation, each share of Class A Preferred Stock shall thereafter be
convertible (or shall be converted into a security which shall be convertible)
into the kind and amount of shares of stock or other securities or property to
which a holder of the number of shares of Common Stock of the Corporation
deliverable upon conversion of such Class A Preferred Stock would have been
entitled upon such consolidation, merger or sale; and, in such case, appropriate
adjustment (as determined in good faith by the Board of Directors) shall be made
in the application of the provisions in this Section C.4. set forth with respect
to the rights and interest thereafter of the holders of the Class A Preferred
Stock, to the end that the provisions set forth in this Section C.4. (including
provisions with respect to changes in and other adjustments of the Conversion
Price) shall hereafter be applicable, as nearly as reasonably may be, in
relation to any shares of stock or other property thereafter deliverable upon
the conversion of the Class A Preferred Stock.

              i. NO IMPAIRMENT. The Corporation will not, by amendment of its
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be

                                      -7-

<PAGE>

observed or performed hereunder by the Corporation, but will at all times in
good faith assist in the carrying out of all the provisions of this Section C.4.
and in the taking of all such action as may be necessary or appropriate in order
to protect the Conversion Rights of the holders of the Class A Preferred Stock
against impairment.

              j. CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment of the Conversion Price pursuant to this Section
C.4., the Corporation at its expense shall promptly compute such adjustment or
readjustment in accordance with the terms hereof and furnish to each holder of
Class A Preferred Stock a certificate setting forth such adjustment or
readjustment and showing in detail the facts upon which such adjustment or
readjustment is based. The Corporation shall, upon the written request at any
time of any holder of Class A Preferred Stock, furnish or cause to be furnished
to such holder a similar certificate setting forth (i) such adjustments and
readjustments, (ii) the Conversion Price then in effect, and (iii) the number of
shares of Common Stock and the amount, if any, of other property which then
would be received upon the conversion of Class A Preferred Stock.

              k. NOTICE OF RECORD DATE. In the event:

                   (i) that the Corporation declares a dividend (or any other
distribution) on its Common Stock payable in Common Stock or other securities of
the Corporation;

                   (ii) that the Corporation subdivides or combines its
outstanding shares of Common Stock;

                   (iii) of any reclassification of the Common Stock of the
Corporation (other than a subdivision or combination of its outstanding shares
of Common Stock or a stock dividend or stock distribution thereon), or of any
consolidation or merger of the Corporation into or with another corporation, or
of the sale of all or substantially all of the assets of the Corporation; or

                   (iv) of the involuntary or voluntary dissolution, liquidation
or winding up of the Corporation;

then the Corporation shall cause to be filed at its principal office or at the
office of the transfer agent of the Class A Preferred Stock, and shall cause to
be mailed to the holders of the Class A Preferred Stock at their last addresses
as shown on the records of the Corporation or such transfer agent, at least ten
days prior to the date specified in (A) below or twenty days before the date
specified in (B) below, a notice stating:

                        (A) the record date of such dividend, distribution,
subdivision or combination, or, if a record is not to be taken, the date as of
which the holders of Common Stock of record to be entitled to such dividend,
distribution, subdivision or combination are to be determined, or

                        (B) the date on which such reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up is expected
to become effective, and

                                      -8-

<PAGE>

the date as of which it is expected that holders of Common Stock of record shall
be entitled to exchange their shares of Common Stock for securities or other
property deliverable upon such reclassification, consolidation, merger, sale,
dissolution or winding up.

         5. MANDATORY CONVERSION. All shares of Class A Preferred Stock shall
convert into shares of Common Stock in accordance with the provisions of this
Section C.5.:

              a. MANDATORY CONVERSION DATE. The "Class A Mandatory Conversion
Date" shall occur upon the earliest to occur of (i) the closing of the sale of
shares of Common Stock in a public offering pursuant to an effective
registration statement under the Securities Act of 1933, as amended (the
"Securities Act"), (ii) the resolution of a majority of the Board of Directors
of the Corporation to effect a conversion of the Class A Preferred Stock, or
(iii) the automatic conversion of the Class D Preferred Stock, Class E Preferred
Stock and Class F Preferred Stock pursuant to Sections F.5., G.5. and H.5. of
this Article FOURTH.

              b. CONVERSION. Upon the Class A Mandatory Conversion Date, (i) all
outstanding shares of Class A Preferred Stock shall automatically be converted
into shares of Common Stock, at the then effective conversion rate and (ii) the
number of authorized shares of Preferred Stock shall be automatically reduced by
the number of shares of Preferred Stock that had been designated as Class A
Preferred Stock, and all provisions included under this Section C "Class A
Preferred Stock", and all references to the Class A Preferred Stock herein shall
be deemed deleted from this Fourth Amended and Restated Certificate of
Incorporation and shall be of no further force or effect.

              c. NOTICE. All holders of record of shares of Class A Preferred
Stock shall be given prompt written notice of the Mandatory Conversion Date and
the place designated for the surrender of the certificates representing of all
such shares of Class A Preferred Stock pursuant to this Section C.5. Such notice
need not be given in advance of the occurrence of the Mandatory Conversion Date.
Such notice shall be sent by first class or registered mail, postage prepaid, to
each record holder of Class A Preferred Stock at such holder's address last
shown on the records of the transfer agent for the Class A Preferred Stock (or
the records of the Corporation if it serves as its own Transfer agent). Upon
receipt of such notice, each holder of shares of Class A Preferred Stock shall
surrender his or its certificate or certificates for all such shares to the
Corporation at the place designated in such notice, and shall thereafter receive
certificates for the number of shares of Common Stock to which such holder is
entitled pursuant to this Section C.5. On the Class A Mandatory Conversion Date,
all rights with respect to the Class A Preferred Stock so converted, including
the rights, if any, to receive notices and vote (other than as a holder of
Common Stock) will terminate, except for the rights of the holders thereof, upon
surrender of their certificate or certificates therefor, to receive certificates
for the number of shares of Common Stock into which such Class A Preferred Stock
has been converted, and payment of any declared but unpaid dividends thereon,
which rights shall continue. If so required by the Corporation, certificates
surrendered for conversion shall be endorsed or accompanied by written
instrument or instruments of transfer, in form satisfactory to the Corporation,
duly executed by the registered holder or

                                      -9-

<PAGE>

by his or its attorney duly authorized in writing. As soon as practicable after
the Class A Mandatory Conversion Date and the surrender of the certificate or
certificates for Class A Preferred Stock, the Corporation shall cause to be
issued and delivered to such holder, or on his or its written order, a
certificate or certificates for the number of full shares of Common Stock
issuable on such conversion in accordance with the provisions hereof and cash as
provided in Section C.4.(b), below, in respect of any fraction of a share of
Common Stock otherwise issuable upon such conversion.

              d. CERTIFICATES. All certificates evidencing shares of Class A
Preferred Stock which are required to be surrendered for conversion in
accordance with the provisions hereof shall, from and after the Class A
Mandatory Conversion Date, be deemed to have been retired and cancelled and the
shares of Class A Preferred Stock represented thereby converted into Common
Stock for all purposes notwithstanding the failure of the holder or holders
thereof to surrender such certificates on or prior to such date. The Corporation
may thereafter take such appropriate action (without the need for stockholder
action) as may be necessary to reduce the authorized Class A Preferred Stock
accordingly.

         6. STATUS OF REACQUIRED SHARES. Shares of Class A Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable provisions of the laws of the State of Delaware) have the status of
authorized and unissued shares of Class A Preferred Stock issuable in series
undesignated as to class and may be redesignated and reissued.

         7. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class A Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         8. IDENTICAL RIGHTS. Each share of the Class A Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class A Preferred Stock.

         9. CERTIFICATES. So long as any shares of the Class A Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

         10. RANK. The Class A Preferred Stock shall rank senior to the Common
Stock, pari passu with the Class B Preferred Stock and Class C Preferred Stock
and junior to the Class D Preferred Stock, Class E Preferred Stock and Class F
Preferred Stock in right as to dividends and upon liquidation, dissolution or
winding up of the Company.

                                      -10-

<PAGE>

D.       CLASS B PREFERRED STOCK.

         The Class B Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. DIVIDENDS. The Corporation shall not declare or pay any
distributions (as defined below) on shares of Common Stock unless the
Corporation simultaneously declares or pays to the holders of the Class B
Preferred Stock then outstanding a distribution on each outstanding share of
Class B Preferred Stock in an amount equal to the product of (i) the per share
amount, if any, of the dividends or other distributions to be declared, paid or
set aside for the Common Stock, multiplied by (ii) the number of whole shares of
Common Stock into which such share of Class B Preferred Stock is then
convertible. For purposes of this Section D.1., unless the context requires
otherwise, "distribution" shall mean the transfer of cash or property without
consideration, whether by way of dividend or otherwise, payable other than in
Common Stock or other securities of the Corporation, or the purchase or
redemption of shares of the Corporation (other than (i) repurchases of Common
Stock held by employees or directors of, or consultants to, the Corporation upon
termination of their employment or services pursuant to agreements providing for
such repurchase at a price equal to the original issue price of such shares (ii)
repurchases pursuant to the Investors Rights Agreement, dated as of May 23,
2000, by and among the Corporation and holders of its capital stock, and (iii)
redemptions in liquidation or dissolution of the Corporation) for cash or
property, including any such transfer, purchase or redemption by a subsidiary of
this Corporation.

         2. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Corporation, the holders of shares of Class B
Preferred Stock then outstanding shall be entitled to be paid out of the assets
of the Corporation available for distribution to its stockholders, after and
subject to the payment in full of all amounts required to be distributed to any
holders of Preferred Stock ranking on liquidation prior and in preference to the
Class B Preferred Stock, but before any payment shall be made to holders of any
Common Stock and any other class of stock that ranks junior to Class B Preferred
Stock upon liquidation by reason of their ownership thereof, an amount equal to
the liquidation distribution that would be paid to the holder of the Class B
Preferred Stock on the Class B Preferred Stock held by such holder if the Class
A Preferred Stock, Class B Preferred Stock and Class C Preferred Stock had been
converted into Common Stock prior to the liquidation. If upon any such
liquidation, dissolution or winding up of the Corporation the remaining assets
of the Corporation available for distribution to its stockholders shall be
insufficient to pay the holders of shares of Class B Preferred Stock the full
amount to which they shall be entitled, the holders of shares of the Preferred
Stock that is on a parity with Class B Preferred Stock shall share ratably in
any distribution of the remaining assets and funds of the Corporation in
proportion to the respective amounts which would otherwise be payable in respect
of the shares held by them upon such distribution if all amounts payable on or
with respect to such shares were paid in full.

                                      -11-

<PAGE>

              b. After the payment of all preferential amounts required to be
paid to the holders of Preferred Stock ranking on liquidation prior and in
preference to the Class B Preferred Stock, the Class B Preferred Stock and
Preferred Stock that is on a parity with Class B Preferred Stock, upon the
dissolution, liquidation or winding up of the Corporation, the holders of shares
of Common Stock and any other class of stock that ranks junior to Class B
Preferred Stock upon liquidation then outstanding shall be entitled to receive
the remaining assets and funds of the Corporation available for distribution to
its stockholders.

         3. VOTING. Each holder of outstanding shares of Class B Preferred Stock
shall be entitled to the number of votes equal to the number of whole shares of
Common Stock into which the shares of Class B Preferred Stock held by such
holder are then convertible (as adjusted from time to time pursuant to Section
D.4. hereof), at each meeting of stockholders of the Corporation (and written
actions of stockholders in lieu of meetings) with respect to any and all matters
presented to the stockholders of the Corporation for their action or
consideration. Except as provided by law, holders of Class B Preferred Stock
shall vote together with the holders of Common Stock (and with any other class
of the Corporation's preferred stock similarly voting) as a single class.

         4. CONVERSION. All shares of Class B Preferred Stock shall convert into
shares of Common Stock in accordance with the provisions of this Section D.4.:

              a. MANDATORY CONVERSION DATE. The "Class B Mandatory Conversion
Date" shall occur upon the earliest to occur of: (i) the closing of the sale of
shares of Common Stock, in a public offering pursuant to an effective
registration statement under the Securities Act, (ii) the resolution of a
majority of the Board of Directors of the Corporation to effect a conversion of
the Class B Preferred Stock, (iii) the conversion of all of the outstanding
Class A Preferred Stock into Common Stock pursuant to Section C.4, Section C.5
of this Article Fourth, or (iv) the automatic conversion of the Class D
Preferred Stock, Class E Preferred Stock and Class F Preferred Stock pursuant to
Sections F.5., G.5. and H.5. of this Article FOURTH.

              b. CONVERSION. Upon the Class B Mandatory Conversion Date, (i) all
outstanding shares of Class B Preferred Stock shall automatically be converted
into shares of Common Stock, at the then effective conversion rate and (ii) the
number of authorized shares of Preferred Stock shall be automatically reduced by
the number of shares of Preferred Stock that had been designated as Class B
Preferred Stock, and all provisions included under this Section C "Class B
Preferred Stock", and all references to the Class B Preferred Stock herein,
shall be deemed deleted from this Fourth Amended and Restated Certificate of
Incorporation and shall be of no further force or effect.

              c. NOTICE. All holders of record of shares of Class B Preferred
Stock shall be given prompt written notice of the Class B Mandatory Conversion
Date and the place designated for the surrender of the certificates representing
of all such shares of Class B Preferred Stock pursuant to this Section D.4. Such
notice need not be given in advance of the occurrence of the Class B Mandatory
Conversion Date. Such notice shall be sent by first class or registered mail,
postage prepaid, to each record holder of Class B

                                      -12-

<PAGE>

Preferred Stock at such holder's address last shown on the records of the
transfer agent for the Class B Preferred Stock (or the records of the
Corporation, if it serves as its own transfer agent). Upon receipt of such
notice, each holder of shares of Class B Preferred Stock shall surrender his or
its certificate or certificates for all such shares to the Corporation at the
place designated in such notice, and shall thereafter receive certificates for
the number of shares of Common Stock to which such holder is entitled pursuant
to this Section D.4. On the Class B Mandatory Conversion Date, all rights with
respect to the Class B Preferred Stock so converted, including the rights, if
any, to receive notices and vote (other than as a holder of Common Stock) will
terminate, except for the rights of the holders thereof, upon surrender of their
certificate or certificates therefor, to receive certificates for the number of
shares of Common Stock into which such Class B Preferred Stock has been
converted, and payment of any declared but unpaid dividends thereon, which
rights shall continue. If so required by the Corporation, certificates
surrendered for conversion shall be endorsed or accompanied by written
instrument or instruments of transfer, in form satisfactory to the Corporation,
duly executed by the registered holder or by his or its attorney duly authorized
in writing. As soon as practicable after each holder's surrender of the
certificate or certificates for Class B Preferred Stock of such holder, the
Corporation shall cause to be issued and delivered to such holder, or on his or
its written order, a certificate or certificates for the number of full shares
of Common Stock issuable on such conversion in accordance with the provisions
hereof and cash as provided in Subsection D.4.(e), below, in respect of any
fraction of a share of Common Stock otherwise issuable upon such conversion.

              d. CERTIFICATES. All certificates evidencing shares of Class B
Preferred Stock which are required to be surrendered for conversion in
accordance with the provisions hereof shall, from and after the Class B
Mandatory Conversion Date, be deemed to have been retired and canceled and the
shares of Class B Preferred Stock represented thereby converted into Common
Stock for all purposes, notwithstanding the failure of the holder or holders
thereof to surrender such certificates on or prior to such date. The Corporation
may thereafter take such appropriate action (without the need for stockholder
action) as may be necessary to reduce the authorized Class B Preferred Stock
accordingly.

              e. CONVERSION PRICE. On the Mandatory Conversion Date, each share
of Class B Preferred Stock shall automatically be converted into such number of
fully paid and nonassessable shares of Common Stock as is determined by dividing
$5.00 by the Conversion Price (as defined below) in effect at the time of
conversion. The "Conversion Price" shall initially be $5.00. Such initial
Conversion Price, and the rate at which shares of Class B Preferred Stock may be
converted into shares of Common Stock, shall be subject to adjustment as
provided below.

              f. FRACTIONAL SHARES. No fractional shares of Common Stock shall
be issued upon conversion of the Class B Preferred Stock. In lieu of any
fractional shares to which the holder would otherwise be entitled, the
Corporation shall pay cash equal to such fraction multiplied by the then
effective Conversion Price. Upon any such conversion, no adjustment to the
Conversion Price shall be made for any declared but

                                      -13-

<PAGE>

unpaid dividends on the Class B Preferred Stock surrendered for conversion or on
the Common Stock delivered upon conversion.

              g. RESERVATION OF SHARES. The Corporation shall at all times when
the Class B Preferred Stock shall be outstanding, reserve and keep available out
of its authorized but unissued stock, for the purpose of effecting the
conversion of the Class B Preferred Stock, such number of its duly authorized
shares of Common Stock as shall from time to time be sufficient to effect the
conversion of all outstanding Class B Preferred Stock. Before taking any action
which would cause an adjustment reducing the Conversion Price below the then par
value of the shares of Common Stock issuable upon conversion of the Class B
Preferred Stock, the Corporation will take any corporate action which may, in
the opinion of its counsel, be necessary in order that the Corporation may
validly and legally issue fully paid and nonassessable shares of Common Stock at
such adjusted Conversion Price.

              h. ADJUSTMENT FOR STOCK SPLITS AND COMBINATIONS. If the
Corporation shall at any time after the original date of issuance of the Class B
Preferred Stock effect a subdivision of the outstanding Common Stock, the
Conversion Price then in effect immediately before that subdivision shall be
proportionately decreased. If the Corporation shall at any time after the
original date of issuance of the Class B Preferred Stock combine the outstanding
shares of Common Stock, the Conversion Price then in effect immediately before
the combination shall be proportionately increased. Any adjustment under this
paragraph shall become effective at the close of business on the date the
subdivision or combination becomes effective.

              i. ADJUSTMENT FOR CERTAIN DIVIDENDS AND DISTRIBUTIONS. In the
event the Corporation at any time after the original date of issuance of the
Class B Preferred Stock shall make or issue, or fix a record date for the
determination of holders of Common Stock entitled to receive a dividend or other
distribution payable in additional shares of Common Stock, then and in each such
event the Conversion Price for the Class B Preferred Stock then in effect shall
be decreased as of the time of such issuance or, in the event such a record date
shall have been fixed, as of the close of business on such record date, by
multiplying the Conversion Price for the Class B Preferred Stock then in effect
by a fraction:

                   (i) the numerator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date, and

                   (ii) the denominator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
PROVIDED, HOWEVER, if such record date shall have been fixed and such dividend
is not fully paid or if such distribution is not fully made on the date fixed
therefor, the Conversion Price for the Class B Preferred Stock shall be
recomputed accordingly as of the close of business on such record date and
thereafter the Conversion Price for the Class B Preferred Stock shall

                                      -14-

<PAGE>

be adjusted pursuant to this paragraph as of the time of actual payment of such
dividends or distributions; and PROVIDED FURTHER, HOWEVER, that no such
adjustment shall be made if the holders of Class B Preferred Stock
simultaneously receive a dividend or other distribution of shares of Common
Stock in a number equal to the number of shares of Common Stock as they would
have received if all outstanding shares of Class B Preferred Stock had been
converted into Common Stock on the date of such event.

              j. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. In the event
the Corporation at any time after the original date of issuance of the Class B
Preferred Stock shall make or issue, or fix a record date for the determination
of holders of Common Stock entitled to receive, a dividend or other distribution
payable in securities of the Corporation other than shares of Common Stock, then
and in each such event provision shall be made so that the holders of the Class
B Preferred Stock shall receive upon conversion thereof in addition to the
number of shares of Common Stock receivable thereupon, the amount of securities
of the Corporation that they would have received had the Class B Preferred Stock
been converted into Common Stock on the date of such event and had they
thereafter, during the period from the date of such event to and including the
conversion date, retained such securities receivable by them as aforesaid during
such period, giving application to all adjustments called for during such period
under this paragraph with respect to the rights of the holders of the Class B
Preferred Stock; PROVIDED, HOWEVER, that no such adjustment shall be made if the
holders of Class B Preferred Stock simultaneously receive a dividend or other
distribution of such securities in an amount equal to the amount of such
securities as they would have received if all outstanding shares of Class B
Preferred Stock had been converted into Common Stock on the date of such event.

              k. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE, OR SUBSTITUTION. If
the Common Stock issuable upon the conversion of the Class B Preferred Stock
shall be changed into the same or a different number of shares of any class or
classes of Stock whether by capital reorganization, reclassification, or
otherwise (other than a subdivision or combination of shares or stock dividend
provided for above, or a reorganization, merger, consolidation, or sale of
assets provided for below), then and in each such event the holder of each such
share of Class B Preferred Stock shall have the right thereafter to convert such
share into the kind and amount of shares of stock and other securities and
property receivable upon such reorganization, reclassification, or other change,
by holders of the number of shares of Common Stock into which such shares of
Class B Preferred Stock might have been converted immediately prior to such
reorganization, reclassification, or change, all subject to further adjustment
as provided herein.

              l. ADJUSTMENT FOR MERGER OR REORGANIZATION, ETC. In case of any
consolidation or merger of the Corporation with or into another corporation or
the sale of all or substantially all of the assets of the Corporation to another
corporation, each share of Class B Preferred Stock shall thereafter be
convertible (or shall be converted into a security which shall be convertible)
into the kind and amount of shares of stock or other securities or property to
which a holder of the number of shares of Common Stock of the Corporation
deliverable upon conversion of such Class B Preferred Stock would have been
entitled upon such consolidation, merger or sale; and, in such case, appropriate

                                      -15-

<PAGE>

adjustment (as determined in good faith by the Board of Directors) shall be made
in the application of the provisions in this Section D.4. set forth with respect
to the rights and interest thereafter of the holders of the Class B Preferred
Stock, to the end that the provisions set forth in this Section D.4. (including
provisions with respect to changes in and other adjustments of the Conversion
Price) shall thereafter be applicable, as nearly as reasonably may be, in
relation to any shares of stock or other property thereafter deliverable upon
the conversion of the Class B Preferred Stock.

              m. CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment of the Conversion Price pursuant to this Section
D.4., the Corporation at its expense shall promptly compute such adjustment or
readjustment in accordance with the terms hereof and furnish to each holder of
Class B Preferred Stock a certificate setting forth such adjustment or
readjustment and showing in detail the facts upon which such adjustment or
readjustment is based. The Corporation shall, upon the written request at any
time of any holder of Class B Preferred Stock, furnish or cause to be furnished
to such holder a similar certificate setting forth (i) such adjustments and
readjustments, (ii) the Conversion Price then in effect, and (iii) the number of
shares of Common Stock and the amount, if any, of other property which then
would be received upon the conversion of Class B Preferred Stock.

              n. NOTICE OF RECORD DATE. In the event:

                   (i) the Corporation declares a dividend (or any other
distribution) on its Common Stock payable in Common Stock or other securities of
the Corporation;

                   (ii) that the Corporation subdivides or combines its
outstanding shares of Common Stock;

                   (iii) of any reclassification of the Common Stock of the
Corporation (other than a subdivision or combination of its outstanding shares
of Common Stock or a stock dividend or stock distribution thereon), or of any
consolidation or merger of the Corporation into or with another corporation, or
of the sale of all or substantially all of the assets of the Corporation; or

                   (iv) of the involuntary or voluntary dissolution, liquidation
or winding up of the Corporation;

then the Corporation shall cause to be filed at its principal office or at the
office of the transfer agent of the Class B Preferred Stock, and shall cause to
be mailed to the holders of the Class B Preferred Stock at their last addresses
as shown on the records of the Corporation or such transfer agent, at least ten
days prior to the date specified in (A) below or twenty days before the date
specified in (B) below, a notice stating:

                        (A) the record date of such dividend, distribution,
subdivision or combination, or, if a record is not to be taken, the date as of
which the holders of Common Stock of record to be entitled to such dividend,
distribution, subdivision or combination are to be determined, or

                                      -16-

<PAGE>

                        (B) the date on which such reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up is expected
to become effective, and the date as of which it is expected that holders of
Common Stock of record shall be entitled to exchange their shares of Common
Stock for securities or other property deliverable upon such reclassification,
consolidation, merger, sale, dissolution or winding up.

         5. STATUS OF REACQUIRED SHARES. Shares of Class B Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable provisions of the laws of the State of Delaware) have the status of
authorized and unissued shares of Class B Preferred Stock issuable in series
undesignated as to class and may be redesignated and reissued.

         6. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class B Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         7. IDENTICAL RIGHTS. Each share of the Class B Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class B Preferred Stock.

         8. CERTIFICATES. So long as any shares of the Class B Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

         9. RANK. The Class B Preferred Stock shall rank senior to the Common
Stock, pari passu with the Class A Preferred Stock and Class C Preferred Stock
and junior to the Class D Preferred Stock, Class E Preferred Stock and Class F
Preferred Stock in right as to dividends and upon liquidating dissolution or
winding up of the Company.

E.       CLASS C PREFERRED STOCK.

         The Class C Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. DIVIDENDS. The Corporation shall not declare or pay any
distributions (as defined below) on shares of Common Stock unless the
Corporation simultaneously declares or pays to the holders of the Class C
Preferred Stock then outstanding a distribution on each outstanding share of
Class C Preferred Stock in an amount equal to the product of (i) the per share
amount, if any, of the dividends or other distributions to be declared, paid or
set aside for the Common Stock, multiplied by (ii) the number of whole shares of
Common Stock into which such share of Class C Preferred Stock is then
convertible. For purposes of this Section E.1., unless the context requires
otherwise,

                                      -17-

<PAGE>

"distribution" shall mean the transfer of cash or property without
consideration, whether by way of dividend or otherwise, payable other than in
Common Stock or other securities of the Corporation, or the purchase or
redemption of shares of the Corporation (other than (i) repurchases of Common
Stock held by employees or directors of, or consultants to, the Corporation upon
termination of their employment or services pursuant to agreements providing for
such repurchase at a price equal to the original issue price of such shares (ii)
repurchases pursuant to the Investors Rights Agreement, dated as of May 23,
2000, by and among the Corporation and holders of its capital stock, and (iii)
redemptions in liquidation or dissolution of the Corporation) for cash or
property, including any such transfer, purchase or redemption by a subsidiary of
this Corporation.

         2. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up of the Corporation, the holders of shares of Class C
Preferred Stock then outstanding shall be entitled to be paid out of the assets
of the Corporation available for distribution to its stockholders, after and
subject to the payment in full of all amounts required to be distributed to the
holders of any Preferred Stock ranking on liquidation prior and in preference to
the Class C Preferred Stock, but before any payment shall be made to the holders
of any Common Stock and any other class of stock that ranks junior to Class C
Preferred Stock upon liquidation by reason of their ownership thereof, an amount
equal to the liquidation distribution that would be paid to the holder of the
Class C Preferred Stock on the Class C Preferred Stock and any Common Stock held
by such holder if the Class C Preferred Stock had been converted into Common
Stock prior to the liquidation and any Common Stock that was issued or is
issuable by stock grant or upon exercise of stock options granted by the
Corporation to any present or former employee, director or consultant is treated
as not outstanding for purposes of determining the amount of such distribution.
If upon any such liquidation, dissolution or winding up of the Corporation the
remaining assets of the Corporation available for distribution to its
stockholders shall be insufficient to pay the holders of shares of Class C
Preferred Stock the full amount to which they shall be entitled, the holders of
shares of the Preferred Stock that is on parity with Class C Preferred Stock
shall share ratably in any distribution of the remaining assets and funds of the
Corporation in proportion to the respective amounts which would otherwise be
payable in respect of the shares held by them upon such distribution if all
amounts payable on or with respect to such shares were paid in full.

              b. After the payment of all preferential amounts required to be
paid to the holders of Preferred Stock ranking on liquidation prior and in
preference to the Class C Preferred Stock, the Class C Preferred Stock and
Preferred Stock that is on a parity with Class C Preferred Stock, upon the
dissolution, liquidation or winding up of the Corporation, the holders of shares
of Common Stock and any other class of stock that ranks junior to Class C
Preferred Stock upon liquidation then outstanding shall be entitled to receive
the remaining assets and funds of the Corporation available for distribution to
its stockholders.

                                      -18-

<PAGE>

         3. VOTING. Each holder of outstanding shares of Class C Preferred Stock
shall be entitled to the number of votes equal to the number of whole shares of
Common Stock into which the shares of Class C Preferred Stock held by such
holder are then convertible (as adjusted from time to time pursuant to Section
E.4. hereof), at each meeting of stockholders of the Corporation (and written
actions of stockholders in lieu of meetings) with respect to any and all matters
presented to the stockholders of the Corporation for their action or
consideration. Except as provided by law, holders of Class C Preferred Stock
shall vote together with the holders of Common Stock (and with any other class
of the Corporation's preferred stock similarly voting) as a single class.

         4. CONVERSION. All shares of Class C Preferred Stock shall convert into
shares of Common Stock in accordance with the provisions of this Section E.4.:

              a. MANDATORY CONVERSION DATE. The "Class C Mandatory Conversion
Date" shall occur upon the earliest to occur of: (i) the closing of the sale of
shares of Common Stock, in a public offering pursuant to an effective
registration statement under the Securities Act, (ii) the resolution of a
majority of the Board of Directors of the Corporation to effect a conversion of
the Class B Preferred Stock or Class C Preferred Stock, (iii) the conversion of
all of the outstanding Class A Preferred Stock into Common Stock pursuant to
Section C.4 or Section C.5 of this Article Fourth, or (iv) the automatic
conversion of the Class D Preferred Stock, Class E Preferred Stock and Class F
Preferred Stock pursuant to Sections F.5., G.5. and H.5. of this Article FOURTH.

              b. CONVERSION. Upon the Class C Mandatory Conversion Date, (i) all
outstanding shares of Class B Preferred Stock shall automatically be converted
into shares of Common Stock, at the then effective conversion rate and (ii) the
number of authorized shares of Preferred Stock shall be automatically reduced by
the number of shares of Preferred Stock that had been designated as Class C
Preferred Stock, and all provisions included under this Section C "Class C
Preferred Stock", and all references to the Class C Preferred Stock herein,
shall be deemed deleted from this Fourth Amended and Restated Certificate of
Incorporation and shall be of no further force or effect.

              c. NOTICE. All holders of record of shares of Class C Preferred
Stock shall be given prompt written notice of the Class C Mandatory Conversion
Date and the place designated for the surrender of the certificates representing
of all such shares of Class C Preferred Stock pursuant to this Section E.4. Such
notice need not be given in advance of the occurrence of the Class C Mandatory
Conversion Date. Such notice shall be sent by first class or registered mail,
postage prepaid, to each record holder of Class C Preferred Stock at such
holder's address last shown on the records of the transfer agent for the Class C
Preferred Stock (or the records of the Corporation, if it serves as its own
transfer agent). Upon receipt of such notice, each holder of shares of Class C
Preferred Stock shall surrender his or its certificate or certificates for all
such shares to the Corporation at the place designated in such notice, and shall
thereafter receive certificates for the number of shares of Common Stock to
which such holder is entitled pursuant to this Section E.4. On the Class C
Mandatory Conversion Date, all rights with respect to the Class C Preferred
Stock so converted, including the rights, if any, to receive notices and vote
(other than as a holder of Common Stock) will terminate, except for the rights
of

                                      -19-

<PAGE>

the holders thereof, upon surrender of their certificate or certificates
therefor, to receive certificates for the number of shares of Common Stock into
which such Class C Preferred Stock has been converted, and payment of any
declared but unpaid dividends thereon, which rights shall continue. If so
required by the Corporation, certificates surrendered for conversion shall be
endorsed or accompanied by written instrument or instruments of transfer, in
form satisfactory to the Corporation, duly executed by the registered holder or
by his or its attorney duly authorized in writing. As soon as practicable after
each holder's surrender of the certificate or certificates for Class C Preferred
Stock of such holder, the Corporation shall cause to be issued and delivered to
such holder, or on his or its written order, a certificate or certificates for
the number of full shares of Common Stock issuable on such conversion in
accordance with the provisions hereof and cash as provided in Section E.4.(e),
below, in respect of any fraction of a share of Common Stock otherwise issuable
upon such conversion.

              d. CERTIFICATES. All certificates evidencing shares of Class C
Preferred Stock which are required to be surrendered for conversion in
accordance with the provisions hereof shall, from and after the Class C
Mandatory Conversion Date, be deemed to have been retired and canceled and the
shares of Class C Preferred Stock represented thereby converted into Common
Stock for all purposes, notwithstanding the failure of the holder or holders
thereof to surrender such certificates on or prior to such date. The Corporation
may thereafter take such appropriate action (without the need for stockholder
action) as may be necessary to reduce the authorized Class C Preferred Stock
accordingly.

              e. CONVERSION PRICE. On the Class C Mandatory Conversion Date,
each share of Class C Preferred Stock shall be converted into such number of
fully paid and nonassessable shares of Common Stock as is determined by dividing
$5.00 by the Conversion Price (as defined below) in effect at the time of
conversion. The "Conversion Price" shall initially be $5.00. Such initial
Conversion Price, and the rate at which shares of Class C Preferred Stock may be
converted into shares of Common Stock, shall be subject to adjustment as
provided below.

              f. FRACTIONAL Shares. No fractional shares of Common Stock shall
be issued upon conversion of the Class C Preferred Stock. In lieu of any
fractional shares to which the holder would otherwise be entitled, the
Corporation shall pay cash equal to such fraction multiplied by the then
effective Conversion Price. Upon any such conversion, no adjustment to the
Conversion Price shall be made for any declared but unpaid dividends on the
Class C Preferred Stock surrendered for conversion or on the Common Stock
delivered upon conversion.

              g. RESERVATION OF SHARES. The Corporation shall at all times when
the Class C Preferred Stock shall be outstanding, reserve and keep available out
of its authorized but unissued stock, for the purpose of effecting the
conversion of the Class C Preferred Stock, such number of its duly authorized
shares of Common Stock as shall from time to time be sufficient to effect the
conversion of all outstanding Class C Preferred Stock. Before taking any action
which would cause an adjustment reducing the Conversion Price below the then par
value of the shares of Common Stock issuable upon

                                      -20-

<PAGE>

conversion of the Class C Preferred Stock, the Corporation will take any
corporate action which may, in the opinion of its counsel, be necessary in order
that the Corporation may validly and legally issue fully paid and nonassessable
shares of Common Stock at such adjusted Conversion Price.

              h. ADJUSTMENT FOR STOCK SPLITS AND COMBINATIONS. If the
Corporation shall at any time after the original date of issuance of the Class C
Preferred Stock effect a subdivision of the outstanding Common Stock, the
Conversion Price then in effect immediately before that subdivision shall be
proportionately decreased. If the Corporation shall at any time after Class C
Preferred Stock combine the outstanding shares of Common Stock, the Conversion
Price then in effect immediately before the combination shall be proportionately
increased. Any adjustment under this paragraph shall become effective at the
close of business on the date the subdivision or combination becomes effective.

              i. ADJUSTMENT FOR CERTAIN DIVIDENDS AND DISTRIBUTIONS. In the
event the Corporation at any time after the original date of issuance of the
Class C Preferred Stock shall make or issue, or fix a record date for the
determination of holders of Common Stock entitled to receive, a dividend or
other distribution payable in additional shares of Common Stock, then and in
each such event the Conversion Price for the Class C Preferred Stock then in
effect shall be decreased as of the time of such issuance or, in the event such
a record date shall have been fixed, as of the close of business on such record
date, by multiplying the Conversion Price for the Class C Preferred Stock then
in effect by a fraction:

                   (i) the numerator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date, and

                   (ii) the denominator of which shall be the total number of
shares of Common Stock issued and outstanding immediately prior to the time of
such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
PROVIDED, HOWEVER, if such record date shall have been fixed and such dividend
is not fully paid or if such distribution is not fully made on the date fixed
therefor, the Conversion Price for the Class C Preferred Stock shall be
recomputed accordingly as of the close of business on such record date and
thereafter the Conversion Price for the Class C Preferred Stock shall be
adjusted pursuant to this paragraph as of the time of actual payment of such
dividends or distributions; and PROVIDED FURTHER, HOWEVER, that no such
adjustment shall be made if the holders of Class C Preferred Stock
simultaneously receive a dividend or other distribution of shares of Common
Stock in a number equal to the number of shares of Common Stock as they would
have received if all outstanding shares of Class C Preferred Stock had been
converted into Common Stock on the date of such event.

              j. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. In the event
the Corporation at any time after the original date of issuance of the Class C
Preferred Stock shall make or issue, or fix a record date for the determination
of holders of Common

                                      -21-

<PAGE>

Stock entitled to receive a dividend or other distribution payable in securities
of the Corporation other than shares of Common Stock, then and in each such
event provision shall be made so that the holders of the Class C Preferred Stock
shall receive upon conversion thereof in addition to the number of shares of
Common Stock receivable thereupon, the amount of securities of the Corporation
that they would have received had the Class C Preferred Stock been converted
into Common Stock on the date of such event and had they thereafter, during the
period from the date of such event to and including, the conversion date,
retained such securities receivable by them as aforesaid during such period,
giving application to all adjustments called for during such period under this
paragraph with respect to the rights of the holders of the Class C Preferred
Stock; and PROVIDED, HOWEVER, that no such adjustment shall be made if the
holders of Class C Preferred Stock simultaneously receive a dividend or other
distribution of such securities in an amount equal to the amount of such
securities as they would have received if all outstanding shares of Class C
Preferred Stock had been converted into Common Stock on the date of such event.

              k. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE, OR SUBSTITUTION. If
the Common Stock issuable upon the conversion of the Class C Preferred Stock
shall be changed into the same or a different number of shares of any class or
classes of Stock whether by capital reorganization, reclassification, or
otherwise (other than a subdivision or combination of shares or stock dividend
provided for above, or a reorganization, merger, consolidation, or sale of
assets provided for below), then and in each such event the holder of each such
share of Class C Preferred Stock shall have the right thereafter to convert such
share into the kind and amount of shares of stock and other securities and
property receivable upon such reorganization, reclassification, or other change,
by holders of the number of shares of Common Stock into which such shares of
Class C Preferred Stock might have been converted immediately prior to such
reorganization, reclassification, or change, all subject to further adjustment
as provided herein.

              l. ADJUSTMENT FOR MERGER OR REORGANIZATION, ETC. In case of any
consolidation or merger of the Corporation with or into another corporation or
the sale of all or substantially all of the assets of the Corporation to another
corporation, each share of Class C Preferred Stock shall thereafter be
convertible (or shall be converted into a security which shall be convertible)
into the kind and amount of shares of stock or other securities or property to
which a holder of the number of shares of Common Stock of the Corporation
deliverable upon conversion of such Class C Preferred Stock would have been
entitled upon such consolidation, merger or sale; and, in such case, appropriate
adjustment (as determined in good faith by the Board of Directors) shall be made
in the application of the provisions in this Section E.4. set forth with respect
to the rights and interest thereafter of the holders of the Class C Preferred
Stock, to the end that the provisions set forth in this Section E.4. (including
provisions with respect to changes in and other adjustments of the Conversion
Price) shall thereafter be applicable, as nearly as reasonably may be, in
relation to any shares of stock or other property thereafter deliverable upon
the conversion of the Class B Preferred Stock.

              m. CERTIFICATE AS TO ADJUSTMENTS. Upon the occurrence of each
adjustment or readjustment of the Conversion Price pursuant to this
Section E.4., the

                                      -22-

<PAGE>

Corporation at its expense shall promptly compute such adjustment or
readjustment in accordance with the terms hereof and furnish to each holder of
Class C Preferred Stock a certificate setting forth such adjustment or
readjustment and showing in detail the facts upon which such adjustment or
readjustment is based. The Corporation shall, upon the written request at any
time of any holder of Class C Preferred Stock, furnish or cause to be furnished
to such holder a similar certificate setting forth (i) such adjustments and
readjustments, (ii) the Conversion Price then in effect, and (iii) the number of
shares of Common Stock and the amount, if any, of other property which then
would be received upon the conversion of Class C Preferred Stock.

              n. NOTICE OF RECORD DATE. In the event:

                   (i) that the Corporation declares a dividend (or any other
distribution) on its Common Stock payable in Common Stock or other securities of
the Corporation;

                   (ii) that the Corporation subdivides or combines its
outstanding shares of Common Stock;

                   (iii) of any reclassification of the Common Stock of the
Corporation (other than a subdivision or combination of its outstanding shares
of Common Stock or a stock dividend or stock distribution thereon), or of any
consolidation or merger of the Corporation into or with another corporation, or
of the sale of all or substantially all of the assets of the Corporation; or

                   (iv) of the involuntary or voluntary dissolution, liquidation
or winding up of the Corporation;

then the Corporation shall cause to be filed at its principal office or at the
office of the transfer agent of the Class C Preferred Stock, and shall cause to
be mailed to the holders of the Class C Preferred Stock at their last addresses
as shown on the records of the Corporation or such transfer agent, at least ten
days prior to the date specified in (A) below or twenty days before the date
specified in (B) below, a notice stating:

                        (A) record date of such dividend, distribution,
subdivision or combination, or, if a record is not to be taken, the date as of
which the holders of Common Stock of record to be entitled to such dividend,
distribution, subdivision or combination are to be determined, or

                        (B) the date on which such reclassification,
consolidation, merger, sale, dissolution, liquidation or winding up is expected
to become effective, and the date as of which it is expected that holders of
Common Stock of record shall be entitled to exchange their shares of Common
Stock for securities or other property deliverable upon such reclassification,
consolidation, merger, sale, dissolution or winding up.

         5. STATUS OF REACQUIRED SHARES. Shares of Class C Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable

                                      -23-

<PAGE>

provisions of the laws of the State of Delaware) have the status of authorized
and unissued shares of Class C Preferred Stock issuable in series undesignated
as to class and may be redesignated and reissued.

         6. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class C Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         7. IDENTICAL RIGHTS. Each share of the Class C Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class C Preferred Stock.

         8. CERTIFICATES. So long as any shares of the Class C Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

         9. RANK. The Class C Preferred Stock shall rank senior to the Common
Stock, pari passu with the Class A Preferred Stock and Class B Preferred Stock
and junior to the Class D Preferred Stock, Class E Preferred Stock and Class F
Preferred Stock in right as to dividends and upon liquidating dissolution or
winding up of the Company.

F.       CLASS D PREFERRED STOCK.

         The Class D Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. CLASS D STATED VALUE: CLASS D DATE OF ISSUE. The Class D Preferred
Stock shall have a stated value of $2.50 per share (the "Class D Stated Value').
The date a share of Class D Preferred Stock is issued is referred to herein as
its "Class D Date of Issue," and the date the first share of Class D Preferred
Stock is issued is referred to herein as the "Original Class D Date of Issue."

         2. DIVIDENDS.

              a. The holders of shares of Class D Preferred Stock shall be
entitled to receive with respect to each share, when and as declared by the
Board of Directors of the Corporation, out of assets legally available for such
purpose, cumulative dividends at an annual rate, based on a year of 360 days
consisting of 12 thirty-day months, equal to 12.5% prior to May 23, 2000 and 6%
on and after May 23, 2000 applied to the amount of the Class D Stated Value per
share of Class D Preferred Stock. Such dividends shall be payable in respect of
each share of Class D Preferred Stock quarterly, in arrears, on the last day of
March, June, September and December in each year (each a "Class D Dividend
Payment Date"), commencing on the first such date to occur which is at least

                                      -24-

<PAGE>

thirty days after its Class D Date of Issue. The dividend payable on the first
Class D Dividend Payment Date shall be calculated and based on the period from
the Class D Date of Issue through such Class D Dividend Payment Date. Each
period commencing on the later of the Class D Date of Issue of a share of the
Class D Preferred Stock or the first day after the last preceding Class D
Dividend Payment Date and ending on the next Class D Dividend Payment Date or,
in the case of a final dividend, the effective date of a liquidating
distribution, conversion of such shares of Class D Preferred Stock into Common
Stock or redemption of such shares of Class D Preferred Stock is referred to
herein as a "Class D Dividend Period." If the date fixed for payment of a final
liquidating distribution on any shares of Class D Preferred Stock, the date on
which any shares of Class D Preferred Stock are converted into Common Stock or
the date on which any shares of Class D Preferred Stock are redeemed does not
coincide with a Class D Dividend Payment Date, then subject to the provisions
hereof relating to such liquidating distribution, conversion or redemption, the
final Class D Dividend Period applicable to such shares shall be the period from
the last Class D Dividend Payment Date prior to the date such liquidating
distribution, conversion or redemption occurs through the effective date of such
liquidating distribution, conversion or redemption. Notwithstanding any other
provision herein, no dividend shall be payable on the Class D Preferred Stock
after May 23, 2000 without the prior approval of the Board of Directors of the
Corporation. Dividends paid pursuant to this Section F.2 shall be paid on a pari
passu basis with dividends paid pursuant to Section G.2 and H. 2 herein.

              b. Dividends accrued under Section 2.a above on each share of
Class D Preferred Stock after May 23, 2000 may be paid only in cash.

              c. If full dividends on all outstanding shares of Class D
Preferred Stock at the rates per share set out in this Section F.2 have not been
declared and paid or irrevocably set aside in trust for payment for the then
current Class D Dividend Period and all prior Class D Dividend Periods, the
Corporation shall not (i) declare or pay or set aside for payment any dividends
or make any other distribution or payments on the Common Stock, the Class A
Preferred Stock, Class B Preferred Stock, Class C Preferred Stock, or any other
securities of the Corporation ranking junior to shares of Class D Preferred
Stock with respect to the payment of dividends or upon liquidation (the "Class D
Junior Stock") or (ii) make any payment on account of the purchase, redemption
or other retirement of, or pay or make available any money for a sinking fund
for the redemption of, any Class D Junior Stock. No dividends shall be declared
or paid or set aside for payment and no other distribution or payment shall be
made with regard to any Class D Junior Stock, unless full dividends have been
declared and paid or irrevocably set aside for payment with regard to the Class
D Preferred Stock for the then current Class D Dividend Period and at least
three prior consecutive Class D Dividend Periods. For purposes of this Section
F.2.(c), unless the context requires otherwise, "distribution" means the
transfer of cash or property without consideration, whether by way of dividend
or otherwise, payable other than in Common Stock or other securities of the
Corporation or the purchase or redemption of shares of capital stock of the
Corporation (other than (i) repurchases of Common Stock held by employees or
directors of, or consultants to, the Corporation upon termination of their
employment or services pursuant to agreements providing for such repurchase at a
price equal to the original issue

                                      -25-

<PAGE>

price of such shares (ii) repurchases pursuant to the Investors Rights
Agreement, dated as of May 23, 2000, by and among the Corporation and holders of
its capital stock, and (iii) redemptions in liquidation or dissolution of the
Corporation) for cash or property, including any such transfer purchase or
redemption by a subsidiary of this Corporation.

         3. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up (collectively, a "Liquidation") of the Corporation,
holders of shares of Class D Preferred Stock then outstanding shall be entitled
to be paid out of the assets of the Corporation available for distribution to
its stockholders, but after and subject to the payment in full of all amounts
required to be distributed to the holders of Class F Preferred Stock and any
other class or series of stock of the Corporation ranking on liquidation prior
and in preference to the Class D Preferred Stock, including any class of
Preferred Stock subsequently created by the Board of Directors and designated as
ranking in preference to the Class D Preferred Stock (collectively referred to
as "Class D Senior Preferred Stock"), but before any payment shall be made to
the holders of Class D Junior Stock by reason of their ownership thereof, an
amount per share of Class D Preferred Stock equal to the sum of its Class D
Stated Value, plus the amount per share of the cumulative dividends accrued but
unpaid thereon through the date of such Liquidation. If upon any such
Liquidation the remaining assets of the Corporation available for distribution
to its stockholders shall be insufficient to pay the holders of shares of Class
D Preferred Stock the full amount to which they shall be entitled, the holders
of shares of Class D Preferred Stock and any class or series of stock ranking in
liquidation on parity with the Class D Preferred Stock (the "Class D Parity
Preferred Stock") shall share ratably in any distribution of the remaining
assets and funds of the Corporation in proportion to the respective amounts
which would otherwise be payable in respect of the shares held by them upon such
distribution if all amounts payable on or with respect to such shares were paid
in full.

              b. After the payment of all preferential amounts required to be
paid to the holders of Class D Senior Preferred Stock, Class D Preferred Stock
and Class D Parity Preferred Stock, upon dissolution, liquidation or winding up
of the Corporation, the holders of Class D Junior Stock then outstanding shall,
be entitled to receive the remaining assets and funds of the Corporation
available for distribution to its stockholders pursuant to Sections C.2, D.2 and
E.2 of this Article FOURTH.

         4. VOTING RIGHTS. Holders of Class D Preferred Stock shall have the
following voting rights in addition to any voting rights provided by the General
Corporation Law of the State of Delaware:

              a. CERTAIN AMENDMENTS. Holders of Class D Preferred Stock shall
have the right to vote on any amendment to this Restated Certificate of
Incorporation that will affect the rights of the holders of Class D Preferred
Stock in any way, and the affirmative vote of not less than two-thirds of the
votes entitled to be cast by holders of Class D Preferred Stock, voting as a
single class, on any such matter shall be required for approval of such
amendment.

                                      -26-

<PAGE>

              b. GENERAL MATTERS. Except as to the matters specified in Section
F.4.a and any other matters as to which holders of Class D Preferred Stock have
the right to vote separately as a class under the General Corporation Law of the
State of Delaware or otherwise, holders of Class D Preferred Stock shall have
the right to vote on any matter as to which holders of the Common Stock have the
right to vote. With regard to any such matter, holders of Class D Preferred
Stock shall vote together with holders of the Common Stock (and with any other
class of the Corporation's preferred stock similarly voting) as a single class.

              c. NUMBER OF VOTES. With respect to any of the matters specified
in this Section F.4., each holder of Class D Preferred Stock shall be entitled
to cast a number of votes equal to the number of whole shares of Common Stock
into which the shares of Class D Preferred Stock held by such holder could be
converted pursuant to the provisions of Section F.5. hereof as of the record
date for the determination of the stockholders entitled to vote on such matter
or, if no such record date is established, the date such vote is taken or
written consent of stockholders is solicited.

         5. CONVERSION. The outstanding shares of Class D Preferred Stock shall
be convertible into shares of Common Stock as follows:

              a. AUTOMATIC CONVERSION.

                   (i) Each share of Class D Preferred Stock automatically shall
be converted into validly authorized and issued, fully paid and nonassessable
shares of Common Stock, as provided herein, immediately prior to the
consummation of a Change in Control or a Qualified Public Offering (as each term
is defined below). As used in this Section F.5, a "Change in Control" shall mean
the occurrence after the Original Class D Date of Issue of any of the following:
(x) the acquisition of voting securities (other than upon the conversion of any
class of Preferred Stock) of the Corporation in a single transaction or series
of related transactions by any person or group of persons that results in such
person or group, together with its affiliates, becoming, directly or indirectly,
the beneficial owner of in excess of 50% of the outstanding voting securities of
the Corporation; (y) a merger or consolidation of the Corporation with any other
corporation or legal entity regardless of which entity is the survivor, other
than a merger or consolidation which would result in the voting securities (or
Preferred Stock convertible into voting securities) of the Corporation
outstanding immediately prior thereto continuing to represent (either by
remaining outstanding or being converted into voting securities of the surviving
entity) in excess of 50% of the voting securities of the Corporation or such
surviving entity outstanding immediately after such merger or consolidation; or
(z) the sale or disposition of all or substantially all of the Corporation's
assets in a single transaction or series of related transactions other than in a
transaction in which holders of the voting securities of the Corporation
immediately prior to such transaction receive voting securities of the acquiror
of such assets or its affiliate, that represent in excess of 50% of the voting
securities of such entity after consummation of such transaction. As used in
this Restated Certificate, "Qualified Public Offering" shall mean an
underwritten public offering of Common Stock pursuant to an effective
registration statement under the Securities Act of 1933, as amended, that (x)
results in the

                                      -27-

<PAGE>

Corporation receiving at least $30 million in gross proceeds and (y) that is
made at an initial offering price per share that reflects a market
capitalization value prior to such offering of at least $200 million for the
Corporation.

                   (ii) Immediately prior to the consummation of a Change in
Control, the outstanding shares of Class D Preferred Stock shall be converted
into shares of Common Stock automatically without any further action by the
holders of such shares and whether or not the certificates representing such
shares are surrendered to the Corporation or its transfer agent, provided,
however, that the Corporation shall not be obligated to issue certificates
evidencing the shares of Common Stock issuable upon such conversion unless the
certificates evidencing such shares of Class D Preferred Stock are either
delivered to the Corporation or its transfer agent as provided below, or the
holder thereof notifies the Corporation or its transfer agent that such
certificates have been lost, stolen or destroyed and executes an agreement
reasonably satisfactory to the Corporation to indemnify the Corporation from any
loss incurred by it in connection with such certificates. Upon the occurrence of
such automatic conversion of the Class D Preferred Stock, the holders of Class D
Preferred Stock shall surrender the certificates representing such shares at the
office of the Corporation or any transfer agent for Class D Preferred Stock or
Common Stock. Thereupon, there shall be issued and delivered to such holder
promptly at such office and in its name as shown on such surrendered certificate
or certificates, a certificate or certificates for the number of shares of
Common Stock into which the Shares of Class D Preferred Stock surrendered were
convertible on the date on which such automatic conversion occurred, and the
Corporation promptly shall pay all declared but unpaid dividends calculated
through the effective date of conversion on the shares of Class D Preferred
Stock converted.

              b. OPTIONAL CONVERSION. Each share of Class D Preferred Stock
shall be convertible, at any time, at the option of the holder thereof, into
validly authorized and issued, fully paid and nonassessable shares of Common
Stock as provided herein.

              c. CLASS D CONVERSION PRICE. Each share of Class D Preferred Stock
shall be convertible in accordance with Section F.5.(a) or F.5.(b) above into
the number of shares of Common Stock which results from dividing the Class D
Stated Value for such share by the Class D Conversion Price for such share that
is in effect at the time of conversion computed as provided herein (the "Class D
Conversion Price"). The initial Class D Conversion Price for this Class shall be
the Class D Stated Value. The Class D Conversion Price shall be subject to
adjustment from time to time as provided in this Section F.5.

              d. ADJUSTMENT FOR STOCK SPLITS, AND COMBINATIONS. If the
Corporation shall at any time or from time to time after the Original Class D
Date of Issue of the Class D Preferred Stock effect a stock split or subdivision
of the outstanding Common Stock, the Class D Conversion Price for the Class D
Preferred Stock in effect immediately before that subdivision shall be
proportionately decreased, and, conversely, if the Corporation shall at any time
or from time to time after the Original Class D Date of Issue of the Class D
Preferred Stock combine the outstanding shares of Common Stock into a smaller
number of shares, the Class D Conversion Price for the Class D Preferred

                                      -28-

<PAGE>

Stock in effect immediately before the combination shall be proportionately
increased. Any adjustment under this Section F.5.(d) shall become effective at
the close of business on the date the stock split, subdivision or combination
becomes effective.

              e. ADJUSTMENT FOR COMMON STOCK DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Class D Date of Issue of
the Class D Preferred Stock issues, or fixes a record date for the determination
of holders of Common Stock entitled to receive, a dividend or other distribution
payable solely in additional shares of Common Stock, in each such event the
Class D Conversion Price for the Class D Preferred Stock that is then in effect
shall be decreased as of the time of such issuance or, in the event such record
date is fixed, as of the close of business on such record date, by multiplying
the Class D Conversion Price then in effect by a fraction:

                   (i) numerator of which is the total number of shares of
Common Stock issued and outstanding immediately prior to the time of such
issuance or the close of business on such record date, and

                   (ii) the denominator of which is the sum f the total number
of shares of Common Stock issued and outstanding immediately prior to the time
of such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
PROVIDED, HOWEVER, that if such record date is fixed and such dividend is not
fully paid or if such distribution is not fully made on the date fixed therefor,
the Class D Conversion Price shall be recomputed accordingly as of the close of
business on such record date and thereafter the Class D Conversion Price shall
be adjusted pursuant to this Section F.5.(e) to reflect the actual payment of
such dividend or distribution.

              f. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Original Class D Date of
Issue of the Class D Preferred Stock issues, or fixes a record date for the
determination of holders of Common Stock entitled to receive, a dividend or
other distribution payable in securities of the Corporation other than shares of
Common Stock or other property, in each such event provision shall be made so
that the holders of the Class D Preferred Stock shall receive upon conversion
thereof, in addition to the number of shares of Common Stock, receivable
thereupon, the amount of securities of the Corporation or other property which
they would have received had their Class D Preferred Stock been converted into
Common Stock on the date of such event and had they thereafter, during the
period from the date of such event to and including, the conversion date,
retained such securities or other property receivable by them as aforesaid
during such period, subject to all other adjustments called for during such
period under this Section F.5. with respect to the rights of the holders of the
Class D Preferred Stock or with respect to such other securities or other
property by their terms. As used herein, the term "other property" does not
include cash.

              g. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE AND SUBSTITUTION. If
at any time or from time to time after the Original Class D Date of Issue of the
Class D Preferred Stock, the Common Stock issuable upon the conversion of the
Class D

                                      -29-

<PAGE>

Preferred Stock is changed into the same or a different number of shares of any
class or series of stock, whether by recapitalization, reclassification or
otherwise (other than a subdivision or combination of shares or stock dividend
or a reorganization, merger, consolidation or sale of assets provided for
elsewhere in this Section 5), then in any such event each holder of Class D
Preferred Stock shall have the right thereafter to convert such stock into the
kind and amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change by holders of the number of
shares of Common Stock into which such shares of Class D Preferred Stock could
have been converted immediately prior to such recapitalization, reclassification
or change, all subject to further adjustment as provided herein or with respect
to such other securities or property by the terms thereof.

              h. REORGANIZATIONS. If at any time or from time to time after the
Original Class D Date of Issue of the Class D Preferred Stock there is a capital
reorganization of the Common Stock (other than a recapitalization, subdivision,
combination, reclassification, exchange or substitution of shares provided for
elsewhere in this Section 5), as a part of such capital reorganization provision
shall be made so that the holders of Class D Preferred Stock shall thereafter be
entitled to receive upon conversion of the Class D Preferred Stock the number of
shares of stock or other securities or property of the company to which a holder
of the number of shares of Common Stock deliverable upon conversion would have
been entitled on such capital reorganization, subject to adjustment in respect
of such stock or securities by the terms thereof. In any such case, appropriate
adjustment shall be made in the application of the provisions of this Section 5
with respect to the rights of the holders of Class D Preferred Stock after such
capital reorganization to the end that the provisions of this Section 5
(including adjustment of the Class D Conversion Price then in effect and the
number of shares issuable upon conversion of the Class D Preferred Stock) shall
be applicable after that event and be as nearly equivalent as practicable.

              i. SALE OF SHARES BELOW CLASS D CONVERSION PRICE.

                   (i) If at any time or from time to time after the Original
Class D Date of Issue of the Class D Preferred Stock, the Corporation issues
or sells, or is deemed by the provisions of clause (iii) of this Section 5(i)
to have issued or sold, Additional Shares of Common Stock (as hereinafter
defined), other than a subdivision or combination of shares of Common Stock
or as a dividend or other distribution of Common Stock as provided for
elsewhere in this Section 5, for an Effective Price (as hereinafter defined)
less than the then effective Class D Conversion Price for the Class D
Preferred Stock, then and in each such case the then existing Class D
Conversion Price for the Class D Preferred Stock shall be reduced as of the
close of business on the date of such issue or sale to a price equal to a
fraction (A) the numerator of which shall be (1) the number of shares of
Common Stock Equivalents Outstanding (as hereinafter defined) immediately
preceding such issue or sale multiplied by the then existing applicable Class
D Conversion Price, plus (2) the Aggregate Consideration Received (as
hereinafter defined) by the Corporation for the total number of Additional
Shares of Common Stock so issued or sold, and (B) the denominator of which
shall be (1) the number of shares of

                                      -30-

<PAGE>

Common Stock Equivalents Outstanding immediately preceding such issue or sale
plus (2) the number of Additional Shares of Common Stock so issued or sold.

                   (ii) For the purpose of making any adjustment required under
this Section F.5.:

                        (A) "ADDITIONAL SHARES OF COMMON STOCK" means all shares
of Common Stock or Convertible Securities issued by the Corporation, whether or
not subsequently reacquired or retired by the Corporation, other than Management
Common Stock (as defined below) to the extent such Management Common Stock
constitutes no more than 10% of the total outstanding Common Stock or Common
Stock issued upon the exercise or conversion of Convertible Securities or the
issuance of Common Stock or Convertible Securities to persons or entities with
which the Company has business relationships provided such issuances are for
other than primarily equity financing purposes and provided that at the time of
any such issuance, the aggregate of such issuance and similar issuances in the
preceding twelve-month period do not exceed 2% of the then outstanding Common
Stock of the Company (assuming full conversion and exercise of all convertible
and exercisable securities then outstanding) or such issuance is expressly
approved by a majority of the directors who are affiliates of the holders of
Class D Preferred Stock on the Company's Board of Directors. The 10% limitation
on Management Common Stock set forth in the immediately preceding sentence shall
apply only during periods prior to any Qualified Public Offering.

                        (B) "AGGREGATE CONSIDERATION RECEIVED" by the
Corporation for any issue or sale of securities shall (1) to the extent it
consists of cash, be computed at the gross amount of cash received by the
Corporation before deduction of any underwriting or similar commissions,
compensation or concessions paid or allowed by the Corporation in connection
with such issue or sale and without deduction of any expenses payable by the
Corporation, (2) to the extent it consists of property other than cash, be
computed at the fair value of that property as determined in good faith by the
Board of Directors of the Corporation, and (3) if Additional Shares of Common
Stock or Convertible Securities are issued or sold together with other stock or
securities or other assets of the Corporation for a consideration which covers
both, be computed as the portion of the consideration so received that may be
reasonably determined in good faith by the Board of Directors of the Corporation
to be allocable to such Additional Shares of Common Stock or Convertible
Securities.

                        (C) "COMMON STOCK EQUIVALENTS OUTSTANDING" means all
shares of Common Stock that are outstanding plus all shares of Common Stock
issuable upon a conversion of Class D Preferred Stock or other Convertible
Securities.

                        (D) "CONVERTIBLE SECURITIES" means stock or other
securities (including but not limited to options, warrants and other rights) of
the Corporation exchangable for or convertible into shares of Common Stock.

                        (E) "EFFECTIVE PRICE" of Additional Shares of Common
Stock means the quotient determined by dividing the total number of Additional
Shares

                                      -31-

<PAGE>

of Common Stock issued or sold, or deemed to have been issued or sold by the
Corporation under this Section F.5.(ii), into the Aggregate Consideration
Received, or deemed to have been received by the Corporation for such issue
under this Section F.5.(ii), for such Additional Shares of Common Stock.

                        (F) "MANAGEMENT COMMON STOCK" means all shares of Common
Stock issued or sold, or deemed to have been issued or sold by the Corporation
under this Section F.5.(ii), to employees, officers, directors, consultants or
advisers of the Corporation or any of its subsidiaries pursuant to any stock
purchase plan, stock option plan, stock bonus plan or other plan or agreement
approved by the Board of Directors of the Corporation.

                   (iii) For the purpose of making any adjustment to the Class D
Conversion Price of the Class D Preferred Stock required under this Section
F.5., if the Corporation issues or sells any Convertible Securities and if the
Effective Price of the shares of Common Stock issuable upon conversion of the
Convertible Securities is less than the Class D Conversion Price then in effect
for the Class D Preferred Stock, the Corporation shall be deemed to have issued
at the time of the issuance of such Convertible Securities that number of
Additional Shares of Common Stock equal to the maximum number of shares of
Common Stock issuable upon conversion thereof and to have received as
consideration for the issuance of such shares an amount equal to the total
amount of the consideration, if any, received by the Corporation for the
issuance of such Convertible Securities, plus the minimum amounts of
consideration, if any, payable to the Corporation (other than by cancellation of
liabilities or obligations evidenced by such Convertible Securities) upon the
conversion thereof; provided that:

                        (A) if the minimum amounts of such consideration cannot
be ascertained, but are a function of antidilution or similar protective
clauses, the Corporation shall be deemed to have received the minimum amounts of
consideration without reference to such clauses;

                        (B) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is reduced over
time or on the occurrence or non-occurrence of specified events other than by
reason of antidilution adjustments, the Effective Price shall be recalculated
using the figure to which such minimum amount of consideration is reduced;

                        (C) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is subsequently
increased, the Effective Price shall be again recalculated using the increased
minimum amount of consideration payable to the Corporation upon the conversion
of Convertible Securities; and

                        (D) no further adjustment of the Class D Conversion
Price, adjusted or subject to adjustment upon the issuance of such convertible
Securities, shall be made as a result of the actual issuance of shares of Common
Stock on the conversion of any such Convertible Securities. If the conversion
privilege represented by any such

                                      -32-

<PAGE>

Convertible Securities shall expire without having been exercised, the Class D
Conversion Price adjusted upon the issuance of such Convertible Securities shall
be readjusted to the Class D Conversion Price which would have been in effect
had an adjustment been made on the basis that the only shares of Common Stock so
issued were the shares of Common Stock, if any, actually issued or sold on the
exercise of such rights of conversion of such Convertible Securities, and such
shares of Common Stock, if any, were issued or sold for the consideration
received for issuing or selling the Convertible Securities actually convened,
plus the consideration, if any, actually received by the Corporation (other than
by cancellation of liabilities or obligations evidenced by such Convertible
Securities) on the conversion of such Convertible Securities, provided that such
readjustment shall not apply to prior conversions of Class D Preferred Stock.

              j. CERTIFICATE OF ADJUSTMENT. In each case of an adjustment or
readjustment of any Class D Conversion Price for the number of shares of Common
Stock or other securities issuable upon conversion of the Class D Preferred
Stock, the Corporation, at its own expense, shall cause its Chief Financial
Officer to compute such adjustment or readjustment in accordance with the
provisions hereof and prepare a certificate showing such adjustment or
readjustment, and shall mail such certificate, by first class mail, postage
prepaid, to each registered holder of the Class D Preferred Stock at the
holder's address as shown in the Corporation's books. The certificate shall set
forth such adjustment or readjustment, showing in detail the facts upon which
such adjustment or readjustment is based. No adjustment in the Class D
Conversion Price shall be required to be made unless it would result in an
increase or decrease of at least one cent, but any adjustments not made because
of this sentence shall be carried forward and taken into account in any
subsequent adjustment otherwise required hereunder.

              k. NOTICES OF RECORD DATE. Upon (i) the establishment by the
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to receive any
dividend or other distribution, or (ii) any capital reorganization of the
Corporation, any reclassification or recapitalization of the capital stock of
the Corporation, any merger or consolidation of the Corporation with or into any
other corporation, or any transfer of all or substantially all the assets of the
Corporation to any other person or any voluntary or involuntary dissolution,
liquidation or winding up of the Corporation, the Corporation shall mail to each
holder of Class D Preferred Stock at least twenty days prior to the record date
specified therein a notice specifying (x) the date on which any such record is
to be taken for the purpose of such dividend or distribution and a description
of such dividend or distribution, (y) the date on which any such reorganization,
reclassification, transfer, consolidation, merger, dissolution, liquidation or
winding up is expected to become effective, and (z) the date, if any, that is to
be fixed as to when the holders of record of Common Stock (or other securities)
shall be entitled to exchange their shares of Common Stock (or other securities)
for securities or other property deliverable upon such reorganization,
reclassification transfer, consolidation, merger, dissolution, liquidation or
winding up.

              l. MECHANICS OF CONVERSION. Each holder of Class D Preferred Stock
who desires to convert the same into shares of Common Stock pursuant to
Section 5(b)

                                      -33-

<PAGE>

hereof shall surrender the certificate or certificates therefor, duly endorsed,
at the office of the Corporation or any transfer agent for the Class D Preferred
Stock or Common Stock, or notify the Corporation or its transfer agent that such
certificates have been lost, stolen or destroyed and execute an agreement
reasonably satisfactory to the Corporation to indemnify the Corporation from any
loss incurred by it in connection with such certificates, and, in either case,
shall give written notice to the Corporation at such office that such holder
elects to convert the same and shall state therein the number of shares of Class
D Preferred Stock being converted. Thereupon the Corporation shall promptly
issue and deliver at such office to such holder a certificate or certificates
for the number of shares of Common Stock to which such holder is entitled and
shall promptly pay in cash any declared or accrued and unpaid dividends on the
shares of Class D Preferred Stock being converted and any cash payable in lieu
of fractional shares. Such conversion shall be deemed to have been made
immediately prior to the close of business on the date of such surrender of the
certificate representing the shares of Class D Preferred Stock to be converted,
and the person entitled to receive the shares of Common Stock issuable upon such
conversion shall be treated for all purposes as the record holder of such shares
of Common Stock on such date.

              m. FRACTIONAL SHARES. No fractional shares of Common Stock shall
be issued upon conversion of Class D Preferred Stock. In lieu of any fractional
share to which the holder would otherwise be entitled, the Corporation shall pay
cash equal to the product (rounded to the nearest cent) of such fraction
multiplied by the Common Stock's per share fair market value as determined in
good faith by the Board of Directors of the Corporation as of the date of
conversion.

              n. RESERVATION OF STOCK ISSUABLE UPON CONVERSION. The Corporation
shall at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Class D Preferred Stock, such number of its shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Class D Preferred Stock; and if at any time the number
of authorized but unissued shares of Common Stock shall not be sufficient to
effect the conversion of all then outstanding shares of the Class D Preferred
Stock, the Corporation will take such corporate action as may, in the opinion of
its counsel, be necessary to increase its authorized but unissued shares of
Common Stock to such number of shares as shall be sufficient for such purpose.

              o. PAYMENT OF TAXES. The Corporation will pay all transfer taxes
or charges that may be imposed with respect to the issue or delivery of shares
of Common Stock upon conversion of shares of Class D Preferred Stock, except for
any tax or other charge imposed in connection with any transfer involved in the
issue and delivery of shares of Common Stock in a name other than that in which
the shares of Class D Preferred Stock so converted were registered.

              p. NO IMPAIRMENT. The Corporation shall not amend its Certificate
of Incorporation or participate in any reorganization, transfer of assets
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action for the purpose of avoiding or seeking to avoid the observance
or performance of any of the

                                      -34-

<PAGE>

terms to be observed or performed hereunder by the Corporation, but shall at all
times in good faith assist in carrying out all such action as may be reasonably
necessary or appropriate in order to protect the conversion rights of the
holders of the Class D Preferred Stock against dilution or other impairment as
provided herein.

         6. REDEMPTION.

              a. At any time on or after December 31, 2004, with the approval of
the Class F Holders pursuant to Section H.4.a.v, each holder of shares of Class
D Preferred Stock shall have the right, at the option of such holder, to require
the Corporation to redeem all or less than all of the shares of Class D
Preferred Stock owned by such holder at a price per share equal to the
Redemption Price (as defined below). Such holder may exercise its redemption
right under this Section F.6. by delivering to the Corporation at its principal
offices a written notice (a "Redemption Notice") stating that such holder
exercises its redemption rights under this Section F.6. and setting forth the
number of shares of Class D Preferred Stock to be redeemed and an account of
such holder to which the Redemption Price for such shares shall be paid (the
"Class D Holder's Account"). Such Redemption Notice shall be accompanied by
either (i) the certificates representing the shares of Class D Preferred Stock
to be redeemed or (ii) a statement by such holder to the effect that such
certificates have been lost, stolen or destroyed and an agreement of such holder
to indemnify the Corporation from any loss incurred by it in connection with
such certificates. The Corporation shall promptly provide to all Class F Holders
a copy of any Redemption Notice it receives from a Class D Holder pursuant to
this Section F.6.a.

              b. Subject to Section H.6.d herein and G.6.d herein, within five
business days after the delivery of the Redemption Notice and the other
materials required by Section F.6.a hereof to the Corporation, the Corporation
shall pay the Redemption Price for the shares of Class D Preferred Stock so
redeemed by wire transfer of immediately available funds to the Class D Holder's
Account. In the event that the number of shares of Class D Preferred Stock
represented by the certificates delivered to the Corporation under Section
F.6.(a) hereof exceeds the number of shares redeemed, the Corporation shall
promptly deliver to the holder at such holder's last address appearing on the
books and records of the Corporation a certificate representing the number of
such shares of Class D Preferred Stock not redeemed.

              c. Such redemption shall be deemed to have been made as of the
close of business on the date of the receipt of such Redemption Notice by the
Corporation, and the rights of the holder thereof, except for the right to
receive the Redemption Price for such redeemed shares as provided in this
Section F.6., shall cease and terminate as to such redeemed shares on such date.

              d. Notwithstanding any other provision herein, upon receipt of a
copy of any Redemption Notice provided pursuant to Section H.6.a below, any
Class D Holder may elect, at any time within the applicable Redemption
Notification Period (as defined in Section H.6.a below), to redeem all or a
portion of such Class D Holder's shares pursuant to the terms set forth in this
Section F.6; provided, that if the funds of the

                                      -35-

<PAGE>

Corporation legally available for redemption of shares of Class D Preferred
Stock and the Class F Preferred Stock or Class E Preferred Stock are
insufficient to redeem the total number of shares of Class D Preferred Stock and
Class F Preferred Stock or Class E Preferred Stock submitted for redemption
during the Redemption Notification Period, those funds which are legally
available will be used to redeem the maximum possible number of whole shares
ratably among the holders of such shares, on a capital contributed basis.

              e. As used herein, "Redemption Price" means the sum of the Class D
Stated Value multiplied by the number of shares to be redeemed, plus all accrued
but unpaid dividends thereon as of the effective date of such redemption.

              f. If the Corporation for any reason fails to redeem any of the
shares of Class D Preferred Stock in accordance with this Section 6 on or prior
to the redemption date determined in accordance with this Section 6, then,
notwithstanding anything to the contrary contained in this Restated Certificate
of Incorporation, the Corporation may not incur any indebtedness for money
borrowed (unless the proceeds of such incurrence of indebtedness are used to
make all overdue redemptions) or borrow or reborrow any amounts under any lines
of credit which it may then have outstanding without the prior written consent
of the holders of not less than a majority of the then outstanding shares of
Class D Preferred Stock voting as a single class.

              g. If the funds of the Corporation legally available for
redemption of shares of Class D Preferred Stock on a redemption are insufficient
to redeem the total number of shares of Class D Preferred Stock submitted for
redemption, those funds which are legally available will be used to redeem the
maximum possible number of whole shares ratably among the holders of such
shares. The shares of Class D Preferred Stock not redeemed shall remain
outstanding and entitled to all rights and preferences provided herein. At any
time thereafter when additional funds of the Corporation are legally available
for the redemption of such shares of Class D Preferred Stock, such funds will be
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available.

         7. STATUS OF REACQUIRED SHARES. Shares of Class D Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable provisions of the laws of the State of Delaware) have the status of
authorized and unissued shares of Class D Preferred Stock issuable in series
undesignated as to class and may be redesignated and reissued.

         8. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class D Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         9. IDENTICAL RIGHTS. Each share of the Class D Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class D Preferred Stock.

                                      -36-

<PAGE>

         10. CERTIFICATES. So long as any shares of the Class D Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

         11. RANK. Except as otherwise provided herein, the Class D Preferred
Stock shall rank senior to the Common Stock, Class A Preferred Stock, Class B
Preferred Stock and Class C Preferred Stock; pari passu with the Class E
Preferred Stock; and junior to the Class F Preferred Stock in right as to
dividends, and upon liquidating dissolution or winding up of the Company.

G.       CLASS E PREFERRED STOCK.

         The Class E Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. CLASS E STATED VALUE: CLASS E DATE OF ISSUE. The Class E Preferred
Stock shall have a stated value of $3.12 per share (the "Class E Stated Value').
The date a share of Class E Preferred Stock is issued is referred to herein as
its "Class E Date of Issue," and the date the first share of Class E Preferred
Stock is issued is referred to herein as the "Original Class E Date of Issue."

         2. DIVIDENDS.

              a. The holders of shares of Class E Preferred Stock shall be
entitled to receive with respect to each share, when and as declared by the
Board of Directors of the Corporation, out of assets legally available for such
purpose, cumulative dividends at an annual rate, based on a year of 360 days
consisting of 12 thirty-day months, equal to 12.5% prior to May 23, 2000 and 6%
on and after May 23, 2000 applied to the amount of the Class E Stated Value per
share of Class E Preferred Stock. Such dividends shall be payable in respect of
each share of Class E Preferred Stock quarterly, in arrears, on the last day of
March, June, September and December in each year (each a "Class E Dividend
Payment Date"), commencing on the first such date to occur which is at least
thirty days after its Class E Date of Issue. The dividend payable on the first
Class E Dividend Payment Date shall be calculated and based on the period from
the Class E Date of Issue through such Class E Dividend Payment Date. Each
period commencing on the later of the Class E Date of Issue of a share of the
Class E Preferred Stock or the first day after the last preceding Class E
Dividend Payment Date and ending on the next Class E Dividend Payment Date or,
in the case of a final dividend, the effective date of a liquidating
distribution, conversion of such shares of Class E Preferred Stock into Common
Stock or redemption of such shares of Class E Preferred Stock is referred to
herein as a "Class E Dividend Period." If the date fixed for payment of a final
liquidating distribution on any shares of Class E Preferred Stock, the date on
which any shares of Class E Preferred Stock are converted into Common Stock or
the date on which any

                                      -37-

<PAGE>

shares of Class E Preferred Stock are redeemed does not coincide with a Class E
Dividend Payment Date, then subject to the provisions hereof relating to such
liquidating distribution, conversion or redemption, the final Class E Dividend
Period applicable to such shares shall be the period from the last Class E
Dividend Payment Date prior to the date such liquidating distribution,
conversion or redemption occurs through the effective date of such liquidating
distribution, conversion or redemption. Notwithstanding any other provision
herein, no dividend shall be payable on the Class E Preferred Stock after May
23, 2000 without the prior approval of the Board of Directors of the
Corporation. Dividends paid pursuant to this Section G.2 shall be paid on a pari
passu basis with dividends paid pursuant to Section F.2 and H.2 herein.

              b. Dividends accrued under Section 2.a above on each share of
Class E Preferred Stock accrued after May 23, 2000 may be paid only in cash.

              c. If full dividends on all outstanding shares of Class E
Preferred Stock at the rates per share set out in this Section G.2. have not
been declared and paid or irrevocably set aside in trust for payment for the
then current Class E Dividend Period and all prior Class E Dividend Periods, the
Corporation shall not (i) declare or pay or set aside for payment any dividends
or make any other distribution or payments on the Common Stock, the Class A
Preferred Stock, Class B Preferred Stock, Class C Preferred Stock, or any other
securities of the Corporation ranking junior to shares of Class E Preferred
Stock with respect to the payment of dividends or upon liquidation (the "Class E
Junior Stock") or (ii) make any payment on account of the purchase, redemption
or other retirement of, or pay or make available any money for a sinking fund
for the redemption of, any Class E Junior Stock. No dividends shall be declared
or paid or set aside for payment and no other distribution or payment shall be
made with regard to any Class E Junior Stock, unless full dividends have been
declared and paid or irrevocably set aside for payment with regard to the Class
E Preferred Stock for the then current Class E Dividend Period and at least
three prior consecutive Class E Dividend Periods. For purposes of this Section
G.2.(c), unless the context requires otherwise, "distribution" means the
transfer of cash or property without consideration, whether by way of dividend
or otherwise, payable other than in Common Stock or other securities of the
Corporation or the purchase or redemption of shares of capital stock of the
Corporation (other than (i) repurchases of Common Stock held by employees or
directors of, or consultants to, the Corporation upon termination of their
employment or services pursuant to agreements providing for such repurchase at a
price equal to the original issue price of such shares (ii) repurchases pursuant
to the Investors Rights Agreement, dated as of May 23, 2000, by and among the
Corporation and holders of its capital stock, and (iii) redemptions in
liquidation or dissolution of the Corporation) for cash or property, including
any such transfer purchase or redemption by a subsidiary of this Corporation.

         3. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up (collectively, a "Liquidation") of the Corporation,
holders of shares of Class E Preferred Stock then outstanding shall be entitled
to be paid out of the assets of the Corporation available for distribution to
its stockholders, but after and subject to the

                                      -38-

<PAGE>

payment in full of all amounts required to be distributed to the holders of
Class F Preferred Stock and any other class or series of stock of the
Corporation ranking on liquidation prior and in preference to the Class E
Preferred Stock, including any class of Preferred Stock subsequently created by
the Board of Directors and designated as ranking in preference to the Class E
Preferred Stock (collectively referred to as "Class E Senior Preferred Stock"),
but before any payment shall be made to the holders of Class E Junior Stock, by
reason of their ownership thereof, an amount per share of Class E Preferred
Stock equal to the sum of the Class E Stated Value, plus the amount per share of
the cumulative dividends accrued but unpaid thereon through the date of such
Liquidation. If upon any such Liquidation the remaining assets of the
Corporation available for distribution to its stockholders shall be insufficient
to pay the holders of shares of Class E Preferred Stock the full amount to which
they shall be entitled, the holders of shares of Class E Preferred Stock and any
class or series of stock ranking in liquidation on parity with the Class E
Preferred Stock (the "Class E Parity Preferred Stock") shall share ratably in
any distribution of the remaining assets and funds of the Corporation in
proportion to the respective amounts which would otherwise be payable in respect
of the shares held by them upon such distribution if all amounts payable on or
with respect to such shares were paid in full.

              b. After the payment of all preferential amounts required to be
paid to the holders of Class E Senior Preferred Stock, Class E Preferred Stock
and Class E Parity Preferred Stock, upon dissolution, liquidation or winding up
of the Corporation, the holders of Class E Junior Securities then outstanding
shall, be entitled to receive the remaining assets and funds of the Corporation
available for distribution to its stockholders pursuant to Section C.2, D.2, E.2
and F.3 of this Article FOURTH.

         4. VOTING RIGHTS. Holders of Class E Preferred Stock shall have the
following voting rights in addition to any voting rights provided by the General
Corporation Law of the State of Delaware:

              a. CERTAIN AMENDMENTS. Holders of Class E Preferred Stock shall
have the right to vote on any amendment to this Restated Certificate of
Incorporation that will affect the rights of the holders of Class E Preferred
Stock in any way, and the affirmative vote of not less than two-thirds of the
votes entitled to be cast by holders of Class E Preferred Stock, voting as a
single class, on any such matter shall be required for approval of such
amendment.

              b. GENERAL MATTERS. Except as to matters specified in Section
G.4.a and any other matters as to which holders of Class E Preferred Stock have
the right to vote separately as a class under the General Corporation Law of the
State of Delaware or otherwise, holders of Class E Preferred Stock shall have
the right to vote on any matter as to which holders of the Common Stock have the
right to vote. With regard to any such matter, holders of Class E Preferred
Stock shall vote together with holders of the Common Stock (and with any other
class of the Corporation's preferred stock similarly voting) as a single class.

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<PAGE>

              c. NUMBER OF VOTES. With respect to any of the matters specified
in this Section G.4., each holder of Class E Preferred Stock shall be entitled
to cast a number of votes equal to the number of whole shares of Common Stock
into which the shares of Class E Preferred Stock held by such holder could be
converted pursuant to the provisions of Section G.5. hereof as of the record
date for the determination of the stockholders entitled to vote on such matter
or, if no such record date is established, the date such vote is taken or
written consent of stockholders is solicited.

         5. CONVERSION. The outstanding shares of Class E Preferred Stock shall
be convertible into shares of Common Stock as follows:

              a. AUTOMATIC CONVERSION.

                   (i) Each share of Class E Preferred Stock automatically shall
be converted into validly authorized and issued, fully paid and nonassessable
shares of Common Stock, as provided herein, immediately prior to the
consummation of a Change in Control (as defined below) or a Qualified Public
Offering. As used in this Section G.5, a "Change in Control" shall mean the
occurrence after the Original Class E Date of Issue of any of the following: (x)
the acquisition of voting securities (other than upon the conversion of any
class of Preferred Stock) of the Corporation in a single transaction or series
of related transactions by any person or group of persons that results in such
person or group, together with its affiliates, becoming, directly or indirectly,
the beneficial owner of in excess of 50% of the outstanding voting securities of
the Corporation; (y) a merger or consolidation of the Corporation with any other
corporation or legal entity regardless of which entity is the survivor, other
than a merger or consolidation which would result in the voting securities (or
Preferred Stock convertible into voting securities) of the Corporation
outstanding immediately prior thereto continuing to represent (either by
remaining outstanding or being converted into voting securities of the surviving
entity) in excess of 50% of the voting securities of the Corporation or such
surviving entity outstanding immediately after such merger or consolidation; or
(z) the sale or disposition of all or substantially all of the Corporation's
assets in a single transaction or series of related transactions other than in a
transaction in which holders of the voting securities of the Corporation
immediately prior to such transaction receive voting securities of the acquiror
of such assets or its affiliate, that represent in excess of 50% of the voting
securities of such entity after consummation of such transaction.

                   (ii) Immediately prior to the consummation of a Change in
Control, the outstanding shares of Class E Preferred Stock shall be converted
into shares of Common Stock automatically without any further action by the
holders of such shares and whether or not the certificates representing such
shares are surrendered to the Corporation or its transfer agent, provided,
however, that the Corporation shall not be obligated to issue certificates
evidencing the shares of Common Stock issuable upon such conversion unless the
certificates evidencing such shares of Class E Preferred Stock are either
delivered to the Corporation or its transfer agent as provided below, or the
holder thereof notifies the Corporation or its transfer agent that such
certificates have been lost, stolen or destroyed and executes an agreement
reasonably satisfactory to the Corporation to indemnify the Corporation from any
loss incurred by it in connection with such

                                      -40-

<PAGE>

certificates. Upon the occurrence of such automatic conversion of the Class E
Preferred Stock, the holders of Class E Preferred Stock shall surrender the
certificates representing such shares at the office of the Corporation or any
transfer agent for Class E Preferred Stock or Common Stock. Thereupon, there
shall be issued and delivered to such holder promptly at such office and in its
name as shown on such surrendered certificate or certificates, a certificate or
certificates for the number of shares of Common Stock into which the Shares of
Class E Preferred Stock surrendered were convertible on the date on which such
automatic conversion occurred, and the Corporation promptly shall pay all
declared but unpaid dividends calculated through the effective date of
conversion on the shares of Class E Preferred Stock converted.

              b. OPTIONAL CONVERSION. Each share of Class E Preferred Stock
shall be convertible, at any time or from time to time, at the option of the
holder thereof, into validly authorized and issued, fully paid and nonassessable
shares of Common Stock as provided herein.

              c. CLASS E CONVERSION PRICE. Each share of Class E Preferred Stock
shall be convertible in accordance with Section G.5.(a) or G.5.(b) above into
the number of shares of Common Stock which results from dividing the Class E
Stated Value for such share by the Class E Conversion Price for such share that
is in effect at the time of conversion computed as provided herein (the "Class E
Conversion Price"). The initial Class E Conversion Price for this Class shall be
the Class E Stated Value. The Class E Conversion Price shall be subject to
adjustment from time to time as provided in this Section G.5.

              d. ADJUSTMENT FOR STOCK SPLITS, AND COMBINATIONS. If the
Corporation shall at any time or from time to time after the Original Class E
Date of Issue of the Class E Preferred Stock effect a stock split or subdivision
of the outstanding Common Stock, the Class E Conversion Price for the Class E
Preferred Stock in effect immediately before that subdivision shall be
proportionately decreased, and, conversely, if the Corporation shall at any time
or from time to time after the Original Class E Date of Issue of the Class E
Preferred Stock combine the outstanding shares of Common Stock into a smaller
number of shares, the Class E Conversion Price for the Class E Preferred Stock
in effect immediately before the combination shall be proportionately increased.
Any adjustment under this Section G.5.(d) shall become effective at the close of
business on the date the stock split, subdivision or combination becomes
effective.

              e. ADJUSTMENT FOR COMMON STOCK DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Class E Date of Issue of
the Class E Preferred Stock issues, or fixes a record date for the determination
of holders of Common Stock entitled to receive, a dividend or other distribution
payable solely in additional shares of Common Stock, in each such event the
Class E Conversion Price for the Class E Preferred Stock that is then in effect
shall be decreased as of the time of such issuance or, in the event such record
date is fixed, as of the close of business on such record date, by multiplying
the Class E Conversion Price then in effect by a fraction:

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<PAGE>

                   (i) the numerator of which is the total number of shares of
Common Stock issued and outstanding immediately prior to the time of such
issuance or the close of business on such record date, and

                   (ii) the denominator of which is the sum of the total number
of shares of Common Stock issued and outstanding immediately prior to the time
of such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
PROVIDED, HOWEVER, that if such record date is fixed and such dividend is not
fully paid or if such distribution is not fully made on the date fixed therefor,
the Class E Conversion Price shall be recomputed accordingly as of the close of
business on such record date and thereafter the Class E Conversion Price shall
be adjusted pursuant to this Section G.5.(e) to reflect the actual payment of
such dividend or distribution.

              f. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Original Class E Date of
Issue of the Class E Preferred Stock issues, or fixes a record date for the
determination of holders of Common Stock entitled to receive, a dividend or
other distribution payable in securities of the Corporation other than shares of
Common Stock or other property, in each such event provision shall be made so
that the holders of the Class E Preferred Stock shall receive upon conversion
thereof, in addition to the number of shares of Common Stock, receivable
thereupon, the amount of securities of the Corporation or other property which
they would have received had their Class E Preferred Stock been converted into
Common Stock on the date of such event and had they thereafter, during the
period from the date of such event to and including, the conversion date,
retained such securities or other property receivable by them as aforesaid
during such period, subject to all other adjustments called for during such
period under this Section G.5. with respect to the rights of the holders of the
Class E Preferred Stock or with respect to such other securities or other
property by their terms. As used herein, the term "other property" does not
include cash.

              g. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE AND SUBSTITUTION. If
at any time or from time to time after the Original Class E Date of Issue of the
Class E Preferred Stock, the Common Stock issuable upon the conversion of the
Class E Preferred Stock is changed into the same or a different number of shares
of any class or series of stock, whether by recapitalization, reclassification
or otherwise (other than a subdivision or combination of shares or stock
dividend or a reorganization, merger, consolidation or sale of assets provided
for elsewhere in this Section 5), then in any such event each holder of Class E
Preferred Stock shall have the right thereafter to convert such stock into the
kind and amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change by holders of the number of
shares of Common Stock into which such shares of Class E Preferred Stock could
have been converted immediately prior to such recapitalization, reclassification
or change, all subject to further adjustment as provided herein or with respect
to such other securities or property by the terms thereof.

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<PAGE>

              h. REORGANIZATIONS. If at any time or from time to time after the
Original Class E Date of Issue of the Class E Preferred Stock there is a capital
reorganization of the Common Stock (other than a recapitalization, subdivision,
combination, reclassification, exchange or substitution of shares provided for
elsewhere in this Section 5), as a part of such capital reorganization provision
shall be made so that the holders of Class E Preferred Stock shall thereafter be
entitled to receive upon conversion of the Class E Preferred Stock the number of
shares of stock or other securities or property of the company to which a holder
of the number of shares of Common Stock deliverable upon conversion would have
been entitled on such capital reorganization, subject to adjustment in respect
of such stock or securities by the terms thereof. In any such case, appropriate
adjustment shall be made in the application of the provisions of this Section 5
with respect to the rights of the holders of Class E Preferred Stock after such
capital reorganization to the end that the provisions of this Section 5
(including adjustment of the Class E Conversion Price then in effect and the
number of shares issuable upon conversion of the Class E Preferred Stock) shall
be applicable after that event and be as nearly equivalent as practicable.

              i. SALE OF SHARES BELOW CLASS E CONVERSION PRICE.

                   (i) If at any time or from time to time after the Original
Class E Date of Issue of the Class E Preferred Stock, the Corporation issues or
sells, or is deemed by the provisions of clause (iii) of this Section 5(i) to
have issued or sold, Additional Shares of Common Stock (as hereinafter defined),
other than a subdivision or combination of shares of Common Stock or as a
dividend or other distribution of Common Stock as provided for elsewhere in this
Section 5, for an Effective Price (as hereinafter defined) less than the then
effective Class E Conversion Price for the Class E Preferred Stock, then and in
each such case the then existing Class E Conversion Price for the Class E
Preferred Stock shall be reduced as of the close of business on the date of such
issue or sale to a price equal to a fraction (A) the numerator of which shall be
(1) the number of shares of Common Stock Equivalents Outstanding (as hereinafter
defined) immediately preceding such issue or sale multiplied by the then
existing applicable Class E Conversion Price, plus (2) the Aggregate
Consideration Received (as hereinafter defined) by the Corporation for the total
number of Additional Shares of Common Stock so issued or sold, and (B) the
denominator of which shall be (1) the number of shares of Common Stock
Equivalents Outstanding immediately preceding such issue or sale plus (2) the
number of Additional Shares of Common Stock so issued or sold.

                   (ii) For the purpose of making any adjustment required under
this Section G.5.:

                        (A) "ADDITIONAL SHARES OF COMMON STOCK" means all shares
of Common Stock issued by the Corporation, whether or not subsequently
reacquired or retired by the Corporation, other than Management Common Stock (as
defined below) to the extent such Management Common Stock constitutes no more
than 10% of the total outstanding Common Stock or Common Stock issued upon the
exercise or conversion of Convertible Securities outstanding on the Original
Class E Date of Issue or the issuance of Common Stock or Convertible Securities
to persons or entities with which the

                                      -43-

<PAGE>

Company has business relationships provided such issuances are for other than
primarily equity financing purposes and provided that at the time of any such
issuance, the aggregate of such issuance and similar issuances in the preceding
twelve-month period do not exceed 2% of the then outstanding Common Stock of the
Company (assuming full conversion and exercise of all convertible and
exercisable securities then outstanding) or such issuance is expressly approved
by a majority of the directors who are affiliates of the holders of Class E
Preferred Stock on the Company's Board of Directors. The 10% limitation on
Management Common Stock set forth in the immediately preceding sentence shall
apply only during periods prior to any Qualified Public Offering.

                        (B) "AGGREGATE CONSIDERATION RECEIVED" by the
Corporation for any issue or sale of securities shall (1) to the extent it
consists of cash, be computed at the gross amount of cash received by the
Corporation before deduction of any underwriting or similar commissions,
compensation or concessions paid or allowed by the Corporation in connection
with such issue or sale and without deduction of any expenses payable by the
Corporation, (2) to the extent it consists of property other than cash, be
computed at the fair value of that property as determined in good faith by the
Board of Directors of the Corporation, and (3) if Additional Shares of Common
Stock or Convertible Securities are issued or sold together with other stock or
securities or other assets of the Corporation for a consideration which covers
both, be computed as the portion of the consideration so received that may be
reasonably determined in good faith by the Board of Directors of the Corporation
to be allocable to such Additional Shares of Common Stock or Convertible
Securities.

                        (C) "COMMON STOCK EQUIVALENTS OUTSTANDING" means all
shares of Common Stock that are outstanding plus all shares of Common Stock
issuable upon a conversion of Class E Preferred Stock or other Convertible
Securities.

                        (D) "CONVERTIBLE SECURITIES" means stock or other
securities (including but not limited to options, warrants and other rights) of
the Corporation exchangable for or convertible into shares of Common Stock.

                        (E) "EFFECTIVE PRICE" of Additional Shares of Common
Stock means the quotient determined by dividing the total number of Additional
Shares of Common Stock issued or sold, or deemed to have been issued or sold by
the Corporation under this Section G.5.(ii), into the Aggregate Consideration
Received, or deemed to have been received by the Corporation for such issue
under this Section G.5.(ii), for such Additional Shares of Common Stock.

                        (F) "MANAGEMENT COMMON STOCK" means all shares of Common
Stock issued or sold, or deemed to have been issued or sold by the Corporation
under this Section G.5.(ii), to employees, officers, directors, consultants or
advisers of the Corporation or any of its subsidiaries pursuant to any stock
purchase plan, stock option plan, stock bonus plan or other plan or agreement
approved by the Board of Directors of the Corporation.

                                      -44-

<PAGE>

                   (iii) For the purpose of making any adjustment to the Class E
Conversion Price of the Class E Preferred Stock required under this Section G.5,
if the Corporation issues or sells any Convertible Securities and if the
Effective Price of the shares of Common Stock issuable upon conversion of the
Convertible Securities is less than the Class E Conversion Price then in effect
for the Class E Preferred Stock, the Corporation shall be deemed to have issued
at the time of the issuance of such Convertible Securities that number of
Additional Shares of Common Stock equal to the maximum number of shares of
Common Stock issuable upon conversion thereof and to have received as
consideration for the issuance of such shares an amount equal to the total
amount of the consideration, if any, received by the Corporation for the
issuance of such Convertible Securities, plus the minimum amounts of
consideration, if any, payable to the Corporation (other than by cancellation of
liabilities or obligations evidenced by such Convertible Securities) upon the
conversion thereof; provided that:

                        (A) if the minimum amounts of such consideration cannot
be ascertained, but are a function of antidilution or similar protective
clauses, the Corporation shall be deemed to have received the minimum amounts of
consideration without reference to such clauses;

                        (B) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is reduced over
time or on the occurrence or non-occurrence of specified events other than by
reason of antidilution adjustments, the Effective Price shall be recalculated
using the figure to which such minimum amount of consideration is reduced;

                        (C) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is subsequently
increased, the Effective Price shall be again recalculated using the increased
minimum amount of consideration payable to the Corporation upon the conversion
of Convertible Securities; and

                        (D) no further adjustment of the Class E Conversion
Price, adjusted or subject to adjustment upon the issuance of such convertible
Securities, shall be made as a result of the actual issuance of shares of Common
Stock on the conversion of any such Convertible Securities. If the conversion
privilege represented by any such Convertible Securities shall expire without
having been exercised, the Class E Conversion Price adjusted upon the issuance
of such Convertible Securities shall be readjusted to the Class E Conversion
Price which would have been in effect had an adjustment been made on the basis
that the only shares of Common Stock so issued were the shares of Common Stock,
if any, actually issued or sold on the exercise of such rights of conversion of
such Convertible Securities, and such shares of Common Stock, if any, were
issued or sold for the consideration received for issuing or selling the
Convertible Securities actually convened, plus the consideration, if any,
actually received by the Corporation (other than by cancellation of liabilities
or obligations evidenced by such Convertible Securities) on the conversion of
such Convertible Securities, provided that such readjustment shall not apply to
prior conversions of Class E Preferred Stock.

                                      -45-

<PAGE>

              j. CERTIFICATE OF ADJUSTMENT. In each case of an adjustment or
readjustment of any Class E Conversion Price for the number of shares of Common
Stock or other securities issuable upon conversion of the Class E Preferred
Stock, the Corporation, at its own expense, shall cause its Chief Financial
Officer to compute such adjustment or readjustment in accordance with the
provisions hereof and prepare a certificate showing such adjustment or
readjustment, and shall mail such certificate, by first class mail, postage
prepaid, to each registered holder of the Class E Preferred Stock at the
holder's address as shown in the Corporation's books. The certificate shall set
forth such adjustment or readjustment, showing in detail the facts upon which
such adjustment or readjustment is based. No adjustment in the Class E
Conversion Price shall be required to be made unless it would result in an
increase or decrease of at least one cent, but any adjustments not made because
of this sentence shall be carried forward and taken into account in any
subsequent adjustment otherwise required hereunder.

              k. NOTICES OF RECORD DATE. Upon (i) the establishment by the
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to receive any
dividend or other distribution, or (ii) any capital reorganization of the
Corporation, any reclassification or recapitalization of the capital stock of
the Corporation, any merger or consolidation of the Corporation with or into any
other corporation, or any transfer of all or substantially all the assets of the
Corporation to any other person or any voluntary or involuntary dissolution,
liquidation or winding up of the Corporation, the Corporation shall mail to each
holder of Class E Preferred Stock at least twenty days prior to the record date
specified therein a notice specifying (x) the date on which any such record is
to be taken for the purpose of such dividend or distribution and a description
of such dividend or distribution, (y) the date on which any such reorganization,
reclassification, transfer, consolidation, merger, dissolution, liquidation or
winding up is expected to become effective, and (z) the date, if any, that is to
be fixed as to when the holders of record of Common Stock (or other securities)
shall be entitled to exchange their shares of Common Stock (or other securities)
for securities or other property deliverable upon such reorganization,
reclassification transfer, consolidation, merger, dissolution, liquidation or
winding up.

              l. MECHANICS OF CONVERSION. Each holder of Class E Preferred Stock
who desires to convert the same into shares of Common Stock pursuant to Section
5(b) hereof shall surrender the certificate or certificates therefor, duly
endorsed, at the office of the Corporation or any transfer agent for the Class E
Preferred Stock or Common Stock, or notify the Corporation or its transfer agent
that such certificates have been lost, stolen or destroyed and execute an
agreement reasonably satisfactory to the Corporation to indemnify the
Corporation from any loss incurred by it in connection with such certificates,
and, in either case, shall give written notice to the Corporation at such office
that such holder elects to convert the same and shall state therein the number
of shares of Class E Preferred Stock being converted. Thereupon the Corporation
shall promptly issue and deliver at such office to such holder a certificate or
certificates for the number of shares of Common Stock to which such holder is
entitled and shall promptly pay in cash any declared or accrued and unpaid
dividends on the shares of Class E Preferred Stock being converted and any cash
payable in lieu of fractional shares. Such conversion

                                      -46-

<PAGE>

shall be deemed to have been made immediately prior to the close of business on
the date of such surrender of the certificate representing the shares of Class E
Preferred Stock to be converted, and the person entitled to receive the shares
of Common Stock issuable upon such conversion shall be treated for all purposes
as the record holder of such shares of Common Stock on such date.

              m. FRACTIONAL SHARES. No fractional shares of Common Stock shall
be issued upon conversion of Class E Preferred Stock. In lieu of any fractional
share to which the holder would otherwise be entitled, the Corporation shall pay
cash equal to the product (rounded to the nearest cent) of such fraction
multiplied by the Common Stock's per share fair market value as determined in
good faith by the Board of Directors of the Corporation as of the date of
conversion.

              n. RESERVATION OF STOCK ISSUABLE UPON CONVERSION. The Corporation
shall at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Class E Preferred Stock, such number of its shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Class E Preferred Stock; and if at any time the number
of authorized but unissued shares of Common Stock shall not be sufficient to
effect the conversion of all then outstanding shares of the Class E Preferred
Stock, the Corporation will take such corporate action as may, in the opinion of
its counsel, be necessary to increase its authorized but unissued shares of
Common Stock to such number of shares as shall be sufficient for such purpose.

              o. PAYMENT OF TAXES. The Corporation will pay all transfer taxes
or charges that may be imposed with respect to the issue or delivery of shares
of Common Stock upon conversion of shares of Class E Preferred Stock, except for
any tax or other charge imposed in connection with any transfer involved in the
issue and delivery of shares of Common Stock in a name other than that in which
the shares of Class E Preferred Stock so converted were registered.

              p. NO IMPAIRMENT. The Corporation shall not amend its Certificate
of Incorporation or participate in any reorganization, transfer of assets
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action for the purpose of avoiding or seeking to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Corporation, but shall at all times in good faith assist in carrying out all
such action as may be reasonably necessary or appropriate in order to protect
the conversion rights of the holders of the Class E Preferred Stock against
dilution or other impairment as provided herein.

         6. REDEMPTION.

              a. At any time on or after December 31, 2004, with the approval of
the Class F Holders pursuant to Section H.4.a.v, each holder of shares of Class
E Preferred Stock shall have the right, at the option of such holder, to require
the Corporation to redeem all or less than all of the shares of Class E
Preferred Stock owned by such holder at a price per share equal to the
Redemption Price (as defined below). Such holder may

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<PAGE>

exercise its redemption right under this Section G.6. by delivering to the
Corporation at its principal offices a written notice (a "Redemption Notice")
stating that such holder exercises its redemption rights under this Section G.6.
and setting forth the number of shares of Class E Preferred Stock to be redeemed
and an account of such holder to which the Redemption Price for such shares
shall be paid (the "Class E Holder's Account"). Such Redemption Notice shall be
accompanied by either (i) the certificates representing the shares of Class E
Preferred Stock to be redeemed or (ii) a statement by such holder to the effect
that such certificates have been lost, stolen or destroyed and an agreement of
such holder to indemnify the Corporation from any loss incurred by it in
connection with such certificates. The Corporation shall promptly provide to all
Class F Holders a copy of any Redemption Notice it receives from a Class E
Holder pursuant to this Section G.6.a.

              b. Subject to Section H.6.d herein and F.6.d herein, within five
business days after the delivery of the Redemption Notice and the other
materials required by Section G.6.(a) hereof to the Corporation, the Corporation
shall pay the Redemption Price for the shares of Class E Preferred Stock so
redeemed by wire transfer of immediately available funds to the Class E Holder's
Account. In the event that the number of shares of Class E Preferred Stock
represented by the certificates delivered to the Corporation under Section
G.6.(a) hereof exceeds the number of shares redeemed, the Corporation shall
promptly deliver to the holder at such holder's last address appearing on the
books and records of the Corporation a certificate representing the number of
such shares of Class E Preferred Stock not redeemed.

              c. Such redemption shall be deemed to have been made as of the
close of business on the date of the receipt of such Redemption Notice by the
Corporation, and the rights of the holder thereof, except for the right to
receive the Redemption Price for such redeemed shares as provided in this
Section G.6., shall cease and terminate as to such redeemed shares on such date.

              d. Notwithstanding any other provision herein, upon receipt of a
copy of any Redemption Notice provided pursuant to Section H.6.a below, any
Class E Holder may elect, at any time within the applicable Redemption
Notification Period (as defined in Section H.6.a below), to redeem all or a
portion of such Class E Holder's shares pursuant to the terms set forth in this
Section G.6; provided, that if the funds of the Corporation legally available
for redemption of shares of Class E Preferred Stock and the Class F Preferred
Stock or Class D Preferred Stock are insufficient to redeem the total number of
shares of Class E Preferred Stock and Class F Preferred Stock or Class D
Preferred Stock submitted for redemption during the Redemption Notification
Period, those funds which are legally available will be used to redeem the
maximum possible number of whole shares ratably among the holders of such
shares, on a capital contributed basis.

              e. As used herein, "Redemption Price" means the sum of the Class E
Stated Value multiplied by the number of shares to be redeemed, plus all accrued
but unpaid dividends thereon as of the effective date of such redemption.

                                      -48-

<PAGE>

              f. If the Corporation for any reason fails to redeem any of the
shares of Class E Preferred Stock in accordance with this Section 6 on or prior
to the redemption date determined in accordance with this Section 6, then,
notwithstanding anything to the contrary contained in this Restated Certificate
of Incorporation, the Corporation may not incur any indebtedness for money
borrowed (unless the proceeds of such incurrence of indebtedness are used to
make all overdue redemptions) or borrow or reborrow any amounts under any lines
of credit which it may then have outstanding without the prior written consent
of the holders of not less than a majority of the then outstanding shares of
Class E Preferred Stock voting as a single class.

              g. If the funds of the Corporation legally available for
redemption of shares of Class E Preferred Stock on a redemption are insufficient
to redeem the total number of shares of Class E Preferred Stock submitted for
redemption, those funds which are legally available will be used to redeem the
maximum possible number of whole shares ratably among the holders of such
shares. The shares of Class E Preferred Stock not redeemed shall remain
outstanding and entitled to all rights and preferences provided herein. At any
time thereafter when additional funds of the Corporation are legally available
for the redemption of such shares of Class E Preferred Stock, such funds will be
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available.

         7. STATUS OF REACQUIRED SHARES. Shares of Class E Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable provisions of the laws of the State of Delaware) have the status of
authorized and unissued shares of Class E Preferred Stock issuable in series
undesignated as to class and may be redesignated and reissued.

         8. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class E Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         9. IDENTICAL RIGHTS. Each share of the Class E Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class E Preferred Stock.

         10. CERTIFICATES. So long as any shares of the Class E Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

         11. RANK. Except as otherwise provided herein, the Class E Preferred
Stock shall rank senior to the Common Stock, Class A Preferred Stock, Class B
Preferred Stock and Class C Preferred Stock; pari passu with the Class D
Preferred Stock and junior to the

                                      -49-

<PAGE>

Class F Preferred Stock in right as to dividends, and upon liquidating
dissolution or winding up of the Company.

H.       CLASS F PREFERRED STOCK.

         The Class F Preferred Stock shall have the following rights,
preferences, powers, privileges and restrictions, qualifications and
limitations:

         1. CLASS F STATED VALUE; CLASS F DATE OF ISSUE. The Class F Preferred
Stock shall have a stated value of $4.20 per share (the "Class F Stated Value').
The date a share of Class F Preferred Stock is issued is referred to herein as
its "Class F Date of Issue," and the date the first share of Class F Preferred
Stock is issued is referred to herein as the "Original Class F Date of Issue."

         2. DIVIDENDS.

              a. The holders of shares of Class F Preferred Stock shall be
entitled to receive with respect to each share, when and as declared by the
Board of Directors of the Corporation, out of assets legally available for such
purpose, cumulative dividends at an annual rate, based on a year of 360 days
consisting of 12 thirty-day months, equal to 6% applied to the amount of the
Class F Stated Value per share of Class F Preferred Stock. Such dividends shall
be payable in respect of each share of Class F Preferred Stock quarterly, in
arrears, on the last day of March, June, September and December in each year
(each a "Class F Dividend Payment Date"), commencing on the first such date to
occur which is at least thirty days after its Class F Date of Issue. The
dividend payable on the first Class F Dividend Payment Date shall be calculated
and based on the period from the Class F Date of Issue through such Class F
Dividend Payment Date. Each period commencing on the later of the Class F Date
of Issue of a share of the Class F Preferred Stock or the first day after the
last preceding Class F Dividend Payment Date and ending on the next Class F
Dividend Payment Date or, in the case of a final dividend, the effective date of
a liquidating distribution, conversion of such shares of Class F Preferred Stock
into Common Stock or redemption of such shares of Class F Preferred Stock is
referred to herein as a "Class F Dividend Period." If the date fixed for payment
of a final liquidating distribution on any shares of Class F Preferred Stock,
the date on which any shares of Class F Preferred Stock are converted into
Common Stock or the date on which any shares of Class F Preferred Stock are
redeemed does not coincide with a Class F Dividend Payment Date, then subject to
the provisions hereof relating to such liquidating distribution, conversion or
redemption, the final Class F Dividend Period applicable to such shares shall be
the period from the last Class F Dividend Payment Date prior to the date such
liquidating distribution, conversion or redemption occurs through the effective
date of such liquidating distribution, conversion or redemption. Notwithstanding
any other provision herein, no dividend shall be payable on the Class F
Preferred Stock without the prior approval of the Board of Directors of the
Corporation. Dividends paid pursuant to this Section H.2 shall be paid on a pari
passu basis with dividends paid pursuant to Section F.2 and G.2 herein.

                                      -50-

<PAGE>

              b. Dividends accrued under Section 2.a above on each share of
Class F Preferred Stock accrued after May 23, 2000 may be paid only in cash.

              c. If full dividends on all outstanding shares of Class F
Preferred Stock at the rates per share set out in this Section H.2. have not
been declared and paid or irrevocably set aside in trust for payment for the
then current Class F Dividend Period and all prior Class F Dividend Periods, the
Corporation shall not (i) declare or pay or set aside for payment any dividends
or make any other distribution or payments on the Common Stock, the Class A
Preferred Stock, Class B Preferred Stock, Class C Preferred Stock, Class D
Preferred Stock (to the extent in excess of any pari passu payment or set aside
with respect to the Class F Preferred Stock), Class E Preferred Stock (to the
extent in excess of any pari passu payment or set aside with respect to the
Class F Preferred Stock)or any other securities of the Corporation ranking
junior to shares of Class F Preferred Stock with respect to the payment of
dividends or upon liquidation (the "Class F Junior Stock") or (ii) make any
payment on account of the purchase, redemption or other retirement of, or pay or
make available any money for a sinking fund for the redemption of, any Class F
Junior Stock. No dividends shall be declared or paid or set aside for payment
and no other distribution or payment shall be made with regard to any Class F
Junior Stock, unless full dividends have been declared and paid or irrevocably
set aside for payment with regard to the Class F Preferred Stock for the then
current Class F Dividend Period and at least three prior consecutive Class F
Dividend Periods. For purposes of this Section H.2.(c), unless the context
requires otherwise, "distribution" means the transfer of cash or property
without consideration, whether by way of dividend or otherwise, payable other
than in Common Stock or other securities of the Corporation or the purchase or
redemption of shares of capital stock of the Corporation (other than (i)
repurchases of Common Stock held by employees or directors of, or consultants
to, the Corporation upon termination of their employment or services pursuant to
agreements providing for such repurchase at a price equal to the original issue
price of such shares (ii) repurchases pursuant to the Investors Rights
Agreement, dated as of May 23, 2000, by and among the Corporation and holders of
its capital stock, and (iii) redemptions in liquidation or dissolution of the
Corporation) for cash or property, including any such transfer purchase or
redemption by a subsidiary of this Corporation.

         3. LIQUIDATION, DISSOLUTION OR WINDING UP.

              a. In the event of any voluntary or involuntary liquidation,
dissolution or winding up (collectively, a "Liquidation") of the Corporation,
holders of shares of Class F Preferred Stock then outstanding shall be entitled
to be paid out of the assets of the Corporation available for distribution to
its stockholders, but after and subject to the payment in full of all amounts
required to be distributed to the holders of any other class or series of stock
of the Corporation ranking on liquidation prior and in preference to the Class F
Preferred Stock, including any class of Preferred Stock subsequently created by
the Board of Directors and designated as ranking in preference to the Class F
Preferred Stock (collectively referred to as "Class F Senior Preferred Stock"),
but before any payment shall be made to the holders of shares of Common Stock,
the Class A Preferred Stock, the Class B Preferred Stock, the Class C Preferred
Stock, the Class D Preferred Stock, the Class E Preferred Stock, or any other
Class F Junior Stock, by reason of their

                                      -51-

<PAGE>

ownership thereof, an amount per share of Class F Preferred Stock equal to the
sum of the Class F Stated Value, plus the amount per share of any dividends
declared but unpaid thereon through the date of such Liquidation (the "CLASS F
LIQUIDATION PREFERENCE"). If upon any such Liquidation the remaining assets of
the Corporation available for distribution to its stockholders shall be
insufficient to pay the holders of shares of Class F Preferred Stock the full
amount to which they shall be entitled, the holders of shares of Class F
Preferred Stock and any class or series of stock ranking in liquidation on
parity with the Class F Preferred Stock (the "Class F Parity Preferred Stock")
shall share ratably in any distribution of the remaining assets and funds of the
Corporation in proportion to the respective amounts which would otherwise be
payable in respect of the shares held by them upon such distribution if all
amounts payable on or with respect to such shares were paid in full.

              b. After payment of all preferential amounts required to be paid
to the holders of Class F Senior Preferred Stock, Class F Preferred Stock, Class
F Parity Preferred Stock and Class F Junior Stock (other than Common Stock)
pursuant to Sections C.2, D.2, E.2, F.3, G.3 and H.3.a of this Article FOURTH,
the holders of Class F Preferred Stock shall share ratably in any distribution
of the remaining assets and funds of the Corporation with the holders of the
Common Stock, pursuant to the rights of holders of Common Stock set forth in
Section A.4 of this Article FOURTH, the Class F Preferred Stock being treated
for the purpose of this distribution of remaining assets and funds as having
been converted.

              c. Notwithstanding any other provision of this Section 3, if any
holder of Class F Preferred Stock becomes a Nonparticipating Holder (as defined
in Section 12 of this Subpart H), then the shares of Class F Preferred Stock
held by such Nonparticipating Holder shall no longer be entitled to the Class F
Liquidation Preference and the shares of Class F Preferred Stock held by such
Nonparticipating Holder shall, for all purposes of this Section 3, be treated as
Class F Junior Stock on parity upon liquidation with the Class D Preferred Stock
and Class E Preferred Stock, such Nonparticipating Holder shall be deemed to
have waived all such preference rights, and such waiver shall be binding upon
any transferee of the shares of Class F Preferred Stock held by such
Nonparticipating Holder.

         4. VOTING RIGHTS.

              a. PROTECTIVE PROVISIONS. In addition to any voting rights
provided by the General Corporation Law of the State of Delaware, the Company
shall not take any of the following actions without first obtaining the
affirmative vote of at least a two-thirds majority of the holders of Class F
Preferred Stock voting as a single class, provided such two-thirds majority must
consist of at least two holders of Class F Preferred Stock:

                   (i) SENIOR AND PARITY PREFERRED STOCK. Create or redesignate
any class or series of capital stock that ranks senior to or on parity with the
shares of Class F Preferred Stock upon liquidation or as to the payment of
dividends;

                                      -52-

<PAGE>

                   (ii) CERTAIN AMENDMENTS. Amend this Restated Certificate of
Incorporation that will affect the rights of the holders of Class F Preferred
Stock in any way;

                   (iii) ACQUISITIONS. Approve any transaction or series of
related transactions pursuant to which a person or entity (including a group
acting in concert) would acquire (a) in excess of 50% of the outstanding voting
stock of the Corporation (whether by merger, consolidation, recapitalization,
reorganization, purchase of the outstanding Common or Preferred Stock of the
Corporation or otherwise) or (b) all or substantially all the assets of the
Company, including its subsidiaries;

                   (iv) LIQUIDATION, DISSOLUTION, RECAPITALIZATION OR
REORGANIZATION. Approve any liquidation, dissolution, recapitalization or
reorganization of the Corporation;

                   (v) DIVIDENDS. Declare or pay any dividends or make any
distributions with respect to any capital securities or repurchase or redeem any
capital securities other than as required by the Company's Certificate of
Incorporation as then in effect or by any restricted stock agreements between
the Company and its employees relating to repurchase rights (for purposes of
clarification, this clause (v) is in no way intended to restrict payment of
capital securities as consideration for services rendered pursuant to consulting
agreements);

                   (vi) SALES OF STOCK. Offer, issue or sell any shares of
capital stock of the Company or any of its subsidiaries other than (i) the offer
or issuance of options or shares of capital stock to employees, directors or
consultants (as consideration for services rendered pursuant to consulting
agreements) constituting, when aggregated with all other outstanding options or
shares issued to employees, directors or consultants, no more than 10% of the
total outstanding equity of the Company on a fully diluted basis, as approved by
the Board of Directors, or (ii) the offer or issuance of shares upon the
conversion of any outstanding convertible security or the exercise or conversion
of any outstanding warrant, option or similar right;

                   (vii) INCURRENCE OF INDEBTEDNESS. Incur any indebtedness for
borrowed money (or any other obligations that would be classified as an
"indebtedness" of the Company for accounting purposes) or guarantee any such
indebtedness, in any such case with a term in excess of one year or in an amount
in excess of $100,000;

                   (viii) IPO. Authorize an initial public offering of the
Company's capital stock under the Securities Act of 1933, as amended, other than
a Qualified Initial Public Offering;

                   (ix) AGREEMENTS WITH AFFILIATES. Make or engage in any loans,
leases, contracts or other similar transactions that are not on an arms' length
basis (including but not limited to the payment of dividends or the repurchase
of securities) with any Affiliate of the Company, SatCon, or any of SatCon's
Affiliates, or any members of their immediate family or entities controlled by
them, other than contracts

                                      -53-

<PAGE>

with SatCon or any of SatCon's Affiliates for research and development or the
manufacture of motors and the like which are not material and are consistent
with past custom and practice between the Company and SatCon (for purposes of
this clause (ix), "immediate family" shall be deemed to include parents,
children, siblings and spouse; and "Affiliate" shall have the meaning provided
in Rule 144 under the Securities Act of 1933, as amended, or any successor
rule);

                   (x) MATERIAL ASSET ACQUISITION AND DISPOSITION. Acquire any
material assets or equity securities of any other Person, or sell or otherwise
dispose of any material assets of the Corporation, except to a wholly-owned
subsidiary of the Corporation;

                   (xi) NEW LINES OF BUSINESS. Enter into any new line of
business;

                   (xii) EXPENDITURES IN EXCESS OF BUDGET. Make any expenditures
that, in the aggregate, would deviate by more than 10% from those contemplated
by the annual budget approved by the Company's Board of Directors for the then
current fiscal year;

                   (xiii) WAIVER OF COVENANTS. Waive any covenants or
obligations given or made by other parties for the benefit of the Company or
that otherwise would affect the rights of or benefits to the Class F Holders,
pursuant to the Securities Purchase Agreement, dated May 23, 2000, by and among
the Company and certain holders of Class F Preferred Stock and the Related
Agreements (as defined therein); or

                   (xiv) SALES OF STOCK BY MANAGEMENT. In accordance with
Section 1.4 of the Investors Rights Agreement, dated May 23, 2000, permit any
officer or other member of the Company's management team from transferring any
shares of capital stock of the Company.

              b. GENERAL MATTERS. Except as to the matters specified in Section
H.4.a and any other matters as to which holders of Class F Preferred Stock have
the right to vote separately as a class under the General Corporation Law of the
State of Delaware or otherwise, holders of Class F Preferred Stock shall have
the right to vote on any matter as to which holders of the Common Stock have the
right to vote. With regard to any such matter, holders of Class F Preferred
Stock shall vote together with holders of the Common Stock (and with any other
class of the Corporation's preferred stock similarly voting) as a single class.

              c. NUMBER OF VOTES. Each holder of Class F Preferred Stock shall
be entitled to cast a number of votes equal to the number of whole shares of
Common Stock into which the shares of Class F Preferred Stock held by such
holder could be converted pursuant to the provisions of Section H.5 hereof as of
the record date for the determination of the stockholders entitled to vote on
such matter or, if no such record date is established, the date such vote is
taken or written consent of stockholders is solicited.

                                      -54-

<PAGE>

         5. CONVERSION. The outstanding shares of Class F Preferred Stock shall
be convertible into shares of Common Stock as follows:

              a. AUTOMATIC CONVERSION.

                   (i) Each share of Class F Preferred Stock automatically shall
be converted into validly authorized and issued, fully paid and nonassessable
shares of Common Stock, as provided herein, immediately prior to a Conversion
Event (as defined below). As used herein, a "Conversion Event" means the
occurrence after the Original Class F Date of Issue of any of the following: (A)
the consummation of the sale or other disposition of all or substantially all of
the assets of the Corporation in a single transaction or series of related
transactions to another Person on financial terms that reflect a total equity
value of at least $200 million for the Corporation immediately prior to the
consummation of such transaction or the acquisition of at least a majority of
the outstanding voting stock of the Corporation by another Person by means of a
merger, consolidation or otherwise on financial terms that reflect a total
equity value of at least $200 million for the Corporation immediately prior to
the consummation of such transaction or (B) the consummation of a Qualified
Public Offering.

                   (ii) Immediately prior to the consummation of a Conversion
Event, the outstanding shares of Class F Preferred Stock shall be converted into
shares of Common Stock automatically without any further action by the holders
of such shares and whether or not the certificates representing such shares are
surrendered to the Corporation or its transfer agent, provided, however, that
the Corporation shall not be obligated to issue certificates evidencing the
shares of Common Stock issuable upon such conversion unless the certificates
evidencing such shares of Class F Preferred Stock are either delivered to the
Corporation or its transfer agent as provided below, or the holder thereof
notifies the Corporation or its transfer agent that such certificates have been
lost, stolen or destroyed and executes an agreement reasonably satisfactory to
the Corporation to indemnify the Corporation from any loss incurred by it in
connection with such certificates. Upon the occurrence of such automatic
conversion of the Class F Preferred Stock, the holders of Class F Preferred
Stock shall surrender the certificates representing such shares at the office of
the Corporation or any transfer agent for Class F Preferred Stock or Common
Stock. Thereupon, there shall be issued and delivered to such holder promptly at
such office and in its name as shown on such surrendered certificate or
certificates, a certificate or certificates for the number of shares of Common
Stock into which the Shares of Class F Preferred Stock surrendered were
convertible on the date on which such automatic conversion occurred, and the
Corporation promptly shall pay all declared but unpaid dividends calculated
through the effective date of conversion on the shares of Class F Preferred
Stock converted.

              b. OPTIONAL CONVERSION. Each share of Class F Preferred Stock
shall be convertible, at any time or from time to time, at the option of the
holder thereof, into validly authorized and issued, fully paid and nonassessable
shares of Common Stock as provided herein.

                                      -55-

<PAGE>

              c. CLASS F CONVERSION PRICE. Each share of Class F Preferred Stock
shall be convertible in accordance with Section H.5.a. or H.5.b. above into the
number of shares of Common Stock which results from dividing the Class F Stated
Value for such share by the Class F Conversion Price for such share that is in
effect at the time of conversion computed as provided herein (the "Class F
Conversion Price"). The initial Class F Conversion Price for this Class shall be
the Class F Stated Value. The Class F Conversion Price shall be subject to
adjustment from time to time as provided in this Section H.5.

              d. ADJUSTMENT FOR STOCK SPLITS, AND COMBINATIONS. If the
Corporation shall at any time or from time to time after the Original Class F
Date of Issue of the Class F Preferred Stock effect a stock split or subdivision
of the outstanding Common Stock, the Class F Conversion Price for the Class F
Preferred Stock in effect immediately before that subdivision shall be
proportionately decreased, and, conversely, if the Corporation shall at any time
or from time to time after the Original Class F Date of Issue of the Class F
Preferred Stock combine the outstanding shares of Common Stock into a smaller
number of shares, the Class F Conversion Price for the Class F Preferred Stock
in effect immediately before the combination shall be proportionately increased.
Any adjustment under this Section H.5.d. shall become effective at the close of
business on the date the stock split, subdivision or combination becomes
effective.

              e. ADJUSTMENT FOR COMMON STOCK DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Class F Date of Issue of
the Class F Preferred Stock issues, or fixes a record date for the determination
of holders of Common Stock entitled to receive, a dividend or other distribution
payable solely in additional shares of Common Stock, in each such event the
Class F Conversion Price for the Class F Preferred Stock that is then in effect
shall be decreased as of the time of such issuance or, in the event such record
date is fixed, as of the close of business on such record date, by multiplying
the Class F Conversion Price then in effect by a fraction:

                   (i) numerator of which is the total number of shares of
Common Stock issued and outstanding immediately prior to the time of such
issuance or the close of business on such record date, and

                   (ii) the denominator of which is the sum of the total number
of shares of Common Stock issued and outstanding immediately prior to the time
of such issuance or the close of business on such record date plus the number of
shares of Common Stock issuable in payment of such dividend or distribution;
provided, however, that if such record date is fixed and such dividend is not
fully paid or if such distribution is not fully made on the date fixed therefor,
the Class F Conversion Price shall be recomputed accordingly as of the close of
business on such record date and thereafter the Class F Conversion Price shall
be adjusted pursuant to this Section H.5.e. to reflect the actual payment of
such dividend or distribution.

              f. ADJUSTMENTS FOR OTHER DIVIDENDS AND DISTRIBUTIONS. If the
Corporation at any time or from time to time after the Original Class F Date of
Issue of the Class F Preferred Stock issues, or fixes a record date for the
determination of holders of Common

                                      -56-

<PAGE>

Stock entitled to receive, a dividend or other distribution payable in
securities of the Corporation other than shares of Common Stock or other
property, in each such event provision shall be made so that the holders of the
Class F Preferred Stock shall receive upon conversion thereof, in addition to
the number of shares of Common Stock, receivable thereupon, the amount of
securities of the Corporation or other property which they would have received
had their Class F Preferred Stock been converted into Common Stock on the date
of such event and had they thereafter, during the period from the date of such
event to and including, the conversion date, retained such securities or other
property receivable by them as aforesaid during such period, subject to all
other adjustments called for during such period under this Section H.5. with
respect to the rights of the holders of the Class F Preferred Stock or with
respect to such other securities or other property by their terms. As used
herein, the term "other property" does not include cash.

              g. ADJUSTMENT FOR RECLASSIFICATION, EXCHANGE AND SUBSTITUTION. If
at any time or from time to time after the Original Class F Date of Issue of the
Class F Preferred Stock, the Common Stock issuable upon the conversion of the
Class F Preferred Stock is changed into the same or a different number of shares
of any class or series of stock, whether by recapitalization, reclassification
or otherwise (other than a subdivision or combination of shares or stock
dividend or a reorganization, merger, consolidation or sale of assets provided
for elsewhere in this Section 5), then in any such event each holder of Class F
Preferred Stock shall have the right thereafter to convert such stock into the
kind and amount of stock and other securities and property receivable upon such
recapitalization, reclassification or other change by holders of the number of
shares of Common Stock into which such shares of Class F Preferred Stock could
have been converted immediately prior to such recapitalization, reclassification
or change, all subject to further adjustment as provided herein or with respect
to such other securities or property by the terms thereof.

              h. REORGANIZATIONS. If at any time or from time to time after the
Original Class F Date of Issue of the Class F Preferred Stock there is a capital
reorganization of the Common Stock (other than a recapitalization, subdivision,
combination, reclassification, exchange or substitution of shares provided for
elsewhere in this Section 5), as a part of such capital reorganization provision
shall be made so that the holders of Class F Preferred Stock shall thereafter be
entitled to receive upon conversion of the Class F Preferred Stock the number of
shares of stock or other securities or property of the company to which a holder
of the number of shares of Common Stock deliverable upon conversion would have
been entitled on such capital reorganization, subject to adjustment in respect
of such stock or securities by the terms thereof. In any such case, appropriate
adjustment shall be made in the application of the provisions of this Section 5
with respect to the rights of the holders of Class F Preferred Stock after such
capital reorganization to the end that the provisions of this Section 5
(including adjustment of the Class F Conversion Price then in effect and the
number of shares issuable upon conversion of the Class F Preferred Stock) shall
be applicable after that event and be as nearly equivalent as practicable.

                                      -57-

<PAGE>

              i. SALE OF SHARES BELOW CLASS F CONVERSION PRICE.

                   (i) If at any time or from time to time after the Original
Class F Date of Issue of the Class F Preferred Stock, the Corporation issues or
sells, or is deemed by the provisions of clause (iii) of this Section 5(i) to
have issued or sold, Additional Shares of Common Stock (as hereinafter defined),
other than a subdivision or combination of shares of Common Stock or as a
dividend or other distribution of Common Stock as provided for elsewhere in this
Section 5, for an Effective Price (as hereinafter defined) less than the then
effective Class F Conversion Price for the Class F Preferred Stock, then and in
each such case the then existing Class F Conversion Price for the Class F
Preferred Stock shall be reduced as of the close of business on the date of such
issue or sale to a price equal to a fraction (A) the numerator of which shall be
(1) the number of shares of Common Stock Equivalents Outstanding (as hereinafter
defined) immediately preceding such issue or sale multiplied by the then
existing applicable Class F Conversion Price, plus (2) the Aggregate
Consideration Received (as hereinafter defined) by the Corporation for the total
number of Additional Shares of Common Stock so issued or sold, and (B) the
denominator of which shall be (1) the number of shares of Common Stock
Equivalents Outstanding immediately preceding such issue or sale plus (2) the
number of Additional Shares of Common Stock so issued or sold.

                   (ii) For the purpose of making any adjustment required under
this Section H.5.:

                        (A) "Additional Shares of Common Stock" means all shares
of Common Stock issued by the Corporation, whether or not subsequently
reacquired or retired by the Corporation, other than Management Common Stock (as
defined below) to the extent such Management Common Stock constitutes no more
than 10% of the total outstanding Common Stock or Common Stock issued upon the
exercise or conversion of Convertible Securities outstanding on the Original
Class F Date of Issue or the issuance of Common Stock or Convertible Securities
to persons or entities with which the Company has business relationships
provided such issuances are for other than primarily equity financing purposes
and provided that at the time of any such issuance, the aggregate of such
issuance and similar issuances in the preceding twelve-month period do not
exceed 2% of the then outstanding Common Stock of the Company (assuming full
conversion and exercise of all convertible and exercisable securities then
outstanding) or such issuance is expressly approved by a majority of the
director representatives of the holders of Class F Preferred Stock on the
Company's Board of Directors. The 10% limitation on Management Common Stock set
forth in the immediately preceding sentence shall apply only during periods
prior to any Qualified Public Offering.

                        (B) "Aggregate Consideration Received" by the
Corporation for any issue or sale of securities shall (1) to the extent it
consists of cash, be computed at the gross amount of cash received by the
Corporation before deduction of any underwriting or similar commissions,
compensation or concessions paid or allowed by the Corporation in connection
with such issue or sale and without deduction of any expenses payable by the
Corporation, (2) to the extent it consists of property other than cash, be
computed at the fair value of that property as determined in good faith by the

                                      -58-

<PAGE>

Board of Directors of the Corporation, and (3) if Additional Shares of Common
Stock or Convertible Securities are issued or sold together with other stock or
securities or other assets of the Corporation for a consideration which covers
both, be computed as the portion of the consideration so received that may be
reasonably determined in good faith by the Board of Directors of the Corporation
to be allocable to such Additional Shares of Common Stock or Convertible
Securities.

                        (C) "Common Stock Equivalents Outstanding" means all
shares of Common Stock that are outstanding plus all shares of Common Stock
issuable upon a conversion of Class F Preferred Stock or other Convertible
Securities.

                        (D) "Convertible Securities" means stock or other
securities (including but not limited to options, warrants and other rights) of
the Corporation exchangable for or convertible into shares of Common Stock.

                        (E) "Effective Price" of Additional Shares of Common
Stock means the quotient determined by dividing the total number of Additional
Shares of Common Stock issued or sold, or deemed to have been issued or sold by
the Corporation under this Section H.5.(ii), into the Aggregate Consideration
Received, or deemed to have been received by the Corporation for such issue
under this Section H.5.(ii), for such Additional Shares of Common Stock.

                        (F) "Management Common Stock" means all shares of Common
Stock issued or sold, or deemed to have been issued or sold by the Corporation
under this Section H.5.(ii), to employees, officers, directors, consultants or
advisers of the Corporation or any of its subsidiaries pursuant to any stock
purchase plan, stock option plan, stock bonus plan or other plan or agreement
approved by the Board of Directors of the Corporation.

                   (iii) For the purpose of making any adjustment to the Class F
Conversion Price of the Class F Preferred Stock required under this Section
H.5., if the Corporation issues or sells any Convertible Securities and if the
Effective Price of the shares of Common Stock issuable upon conversion of the
Convertible Securities is less than the Class F Conversion Price then in effect
for the Class F Preferred Stock, the Corporation shall be deemed to have issued
at the time of the issuance of such Convertible Securities that number of
Additional Shares of Common Stock equal to the maximum number of shares of
Common Stock issuable upon conversion thereof and to have received as
consideration for the issuance of such shares an amount equal to the total
amount of the consideration, if any, received by the Corporation for the
issuance of such Convertible Securities, plus the minimum amounts of
consideration, if any, payable to the Corporation (other than by cancellation of
liabilities or obligations evidenced by such Convertible Securities) upon the
conversion thereof; provided that:

                        (A) if the minimum amounts of such consideration cannot
be ascertained, but are a function of antidilution or similar protective
clauses, the Corporation shall be deemed to have received the minimum amounts of
consideration without reference to such clauses;

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<PAGE>

                        (B) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is reduced over
time or on the occurrence or non-occurrence of specified events other than by
reason of antidilution adjustments, the Effective Price shall be recalculated
using the figure to which such minimum amount of consideration is reduced;

                        (C) if the minimum amount of consideration payable to
the Corporation upon the conversion of Convertible Securities is subsequently
increased, the Effective Price shall be again recalculated using the increased
minimum amount of consideration payable to the Corporation upon the conversion
of Convertible Securities; and

                        (D) no further adjustment of the Class F Conversion
Price, adjusted or subject to adjustment upon the issuance of such convertible
Securities, shall be made as a result of the actual issuance of shares of Common
Stock on the conversion of any such Convertible Securities. If the conversion
privilege represented by any such Convertible Securities shall expire without
having been exercised, the Class F Conversion Price adjusted upon the issuance
of such Convertible Securities shall be readjusted to the Class F Conversion
Price which would have been in effect had an adjustment been made on the basis
that the only shares of Common Stock so issued were the shares of Common Stock,
if any, actually issued or sold on the exercise of such rights of conversion of
such Convertible Securities, and such shares of Common Stock, if any, were
issued or sold for the consideration received for issuing or selling the
Convertible Securities actually convened, plus the consideration, if any,
actually received by the Corporation (other than by cancellation of liabilities
or obligations evidenced by such Convertible Securities) on the conversion of
such Convertible Securities, provided that such readjustment shall not apply to
prior conversions of Class F Preferred Stock.

              j. CERTIFICATE OF ADJUSTMENT. In each case of an adjustment or
readjustment of any Class F Conversion Price for the number of shares of Common
Stock or other securities issuable upon conversion of the Class F Preferred
Stock, the Corporation, at its own expense, shall cause its Chief Financial
Officer to compute such adjustment or readjustment in accordance with the
provisions hereof and prepare a certificate showing such adjustment or
readjustment, and shall mail such certificate, by first class mail, postage
prepaid, to each registered holder of the Class F Preferred Stock at the
holder's address as shown in the Corporation's books. The certificate shall set
forth such adjustment or readjustment, showing in detail the facts upon which
such adjustment or readjustment is based. No adjustment in the Class F
Conversion Price shall be required to be made unless it would result in an
increase or decrease of at least one cent, but any adjustments not made because
of this sentence shall be carried forward and taken into account in any
subsequent adjustment otherwise required hereunder.

              k. NOTICES OF RECORD DATE. Upon (i) the establishment by the
Corporation of a record of the holders of any class of securities for the
purpose of determining the holders thereof who are entitled to receive any
dividend or other distribution, or (ii) any capital reorganization of the
Corporation, any reclassification or recapitalization of the capital stock of
the Corporation, any merger or consolidation of the

                                      -60-

<PAGE>

Corporation with or into any other corporation, or any transfer of all or
substantially all the assets of the Corporation to any other person or any
voluntary or involuntary dissolution, liquidation or winding up of the
Corporation, the Corporation shall mail to each holder of Class F Preferred
Stock at least twenty days prior to the record date specified therein a notice
specifying (x) the date on which any such record is to be taken for the purpose
of such dividend or distribution and a description of such dividend or
distribution, (y) the date on which any such reorganization, reclassification,
transfer, consolidation, merger, dissolution, liquidation or winding up is
expected to become effective, and (z) the date, if any, that is to be fixed as
to when the holders of record of Common Stock (or other securities) shall be
entitled to exchange their shares of Common Stock (or other securities) for
securities or other property deliverable upon such reorganization,
reclassification transfer, consolidation, merger, dissolution, liquidation or
winding up.

              l. MECHANICS OF CONVERSION. Each holder of Class F Preferred Stock
who desires to convert the same into shares of Common Stock pursuant to Section
5(b) hereof shall surrender the certificate or certificates therefor, duly
endorsed, at the office of the Corporation or any transfer agent for the Class F
Preferred Stock or Common Stock, or notify the Corporation or its transfer agent
that such certificates have been lost, stolen or destroyed and execute an
agreement reasonably satisfactory to the Corporation to indemnify the
Corporation from any loss incurred by it in connection with such certificates,
and, in either case, shall give written notice to the Corporation at such office
that such holder elects to convert the same and shall state therein the number
of shares of Class F Preferred Stock being converted. Thereupon the Corporation
shall promptly issue and deliver at such office to such holder a certificate or
certificates for the number of shares of Common Stock to which such holder is
entitled and shall promptly pay in cash any declared or accrued and unpaid
dividends on the shares of Class F Preferred Stock being converted and any cash
payable in lieu of fractional shares. Such conversion shall be deemed to have
been made immediately prior to the close of business on the date of such
surrender of the certificate representing the shares of Class F Preferred Stock
to be converted, and the person entitled to receive the shares of Common Stock
issuable upon such conversion shall be treated for all purposes as the record
holder of such shares of Common Stock on such date.

              m. FRACTIONAL SHARES. No fractional shares of Common Stock shall
be issued upon conversion of Class F Preferred Stock. In lieu of any fractional
share to which the holder would otherwise be entitled, the Corporation shall pay
cash equal to the product (rounded to the nearest cent) of such fraction
multiplied by the Common Stock's per share fair market value as determined in
good faith by the Board of Directors of the Corporation as of the date of
conversion.

              n. RESERVATION OF STOCK ISSUABLE UPON CONVERSION. The Corporation
shall at all times reserve and keep available out of its authorized but unissued
shares of Common Stock, solely for the purpose of effecting the conversion of
the shares of the Class F Preferred Stock, such number of its shares of Common
Stock as shall from time to time be sufficient to effect the conversion of all
outstanding shares of the Class F Preferred Stock; and if at any time the number
of authorized but unissued shares of

                                      -61-

<PAGE>

Common Stock shall not be sufficient to effect the conversion of all then
outstanding shares of the Class F Preferred Stock, the Corporation will take
such corporate action as may, in the opinion of its counsel, be necessary to
increase its authorized but unissued shares of Common Stock to such number of
shares as shall be sufficient for such purpose.

              o. PAYMENT OF TAXES. The Corporation will pay all transfer taxes
or charges that may be imposed with respect to the issue or delivery of shares
of Common Stock upon conversion of shares of Class F Preferred Stock, except for
any tax or other charge imposed in connection with any transfer involved in the
issue and delivery of shares of Common Stock in a name other than that in which
the shares of Class F Preferred Stock so converted were registered.

              p. NO IMPAIRMENT. The Corporation shall not amend its Certificate
of Incorporation or participate in any reorganization, transfer of assets
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action for the purpose of avoiding or seeking to avoid the observance
or performance of any of the terms to be observed or performed hereunder by the
Corporation, but shall at all times in good faith assist in carrying out all
such action as may be reasonably necessary or appropriate in order to protect
the conversion rights of the holders of the Class F Preferred Stock against
dilution or other impairment as provided herein.

              q. MERGER OR SALE OF ASSETS. In the event of any merger or sale of
all or substantially all of the assets of the Corporation, each holder of shares
of Class F Preferred Stock then outstanding may elect at its option to receive
both (i) a cash payment in the amount of its Class F Liquidation Preference and
(ii) its ratable share of all consideration to which holders of Common Stock are
entitled, the Class F Preferred Stock being treated for the purpose of this
subsection H.5.q(ii) as having been converted.

         6. REDEMPTION.

              a. Subject to the conditions provided in this Section 6, at any
time on or after May 23, 2005, each holder of shares of Class F Preferred Stock
shall have the right, at the sole option of such holder, to require the
Corporation to redeem all or less than all of the shares of Class F Preferred
Stock owned by such holder at a price per share equal to the Redemption Price
(as defined below). Such holder may exercise its redemption right under this
Section H.6. by delivering to the Corporation at its principal offices a written
notice (a "Redemption Notice") stating that such holder exercises its redemption
rights under this Section H.6. and setting forth the number of shares of Class F
Preferred Stock to be redeemed and an account of such holder to which the
Redemption Price for such shares shall be paid (the "Class F Holder's Account").
Such Redemption Notice shall be accompanied by either (i) the certificates
representing the shares of Class F Preferred Stock to be redeemed or (ii) a
statement by such holder to the effect that such certificates have been lost,
stolen or destroyed and an agreement of such holder to indemnify the Corporation
from any loss incurred by it in connection with such certificates. The
Corporation shall promptly provide to all other Class F Holders, Class D Holders
and Class E Holders written notice of such requested redemption and a copy of
any such Redemption Notice (the "Corporation Redemption Notice"), unless such

                                      -62-

<PAGE>

requested Redemption Notice was received by the Corporation in response to a
Corporation Redemption Notice for which the applicable Redemption Notification
Period (described below) has not yet expired.

              b. Subject to Sections F.6.d and G. 6.d above, upon the fifteenth
day following the date that the Corporation sends a Corporation Redemption
Notice to the other Class F Holders (the "Redemption Notification Period"), the
Corporation shall pay each Class F Holder who has submitted a Redemption Notice
during the Redemption Notification Period its respective Redemption Price for
the shares of Class F Preferred Stock to be redeemed pursuant to the such Class
F Holder's Redemption Notice by wire transfer of immediately available funds to
the Class F Holder's Account; provided that if the funds of the Corporation
legally available for redemption of shares of Class F Preferred Stock are
insufficient to redeem the total number of shares of Class F Preferred Stock
submitted for redemption during such Redemption Notification Period, such shares
shall be redeemed in accordance with Section 6.g below. In the event that the
number of shares of Class F Preferred Stock represented by the certificates
delivered to the Corporation under Section H.6.(a) hereof exceeds the number of
shares redeemed, the Corporation shall promptly deliver to the holder at such
holder's last address appearing on the books and records of the Corporation a
certificate representing the number of such shares of Class F Preferred Stock
not redeemed.

              c. Such redemption shall be deemed to have been made as of the
close of business on the date of the receipt of such Redemption Notice by the
Corporation, and the rights of the holder thereof, except for the right to
receive the Redemption Price for such redeemed shares as provided in this
Section H.6, shall cease and terminate as to such redeemed shares on such date.

              d. Notwithstanding any other provision herein, upon receipt of a
copy of any Redemption Notice provided pursuant to Section F.6.a or Section
G.6.a above, any Class F Holder may elect, at any time within the applicable
five business day period set forth in Section F.6.b or G.6.b above, to redeem
all or a portion of such Class F Holder's shares pursuant to the terms set forth
in this Section H.6; provided, that if the funds of the Corporation legally
available for redemption of shares of Class F Preferred Stock and the Class D
Preferred Stock or Class E Preferred Stock are insufficient to redeem the total
number of shares of Class F Preferred Stock and Class D Preferred Stock or Class
E Preferred Stock submitted for redemption during such applicable five business
day period, those funds which are legally available will be used to redeem the
maximum possible number of whole shares ratably among the holders of such
shares, on a capital contributed basis.

              e. As used herein, "Redemption Price" means the sum of the Class F
Stated Value multiplied by the number of shares to be redeemed, plus all accrued
but unpaid dividends thereon as of the effective date of such redemption.

              f. If the Corporation for any reason fails to redeem any of the
shares of Class F Preferred Stock in accordance with this Section 6 on or prior
to the redemption date determined in accordance with this Section 6, then,
notwithstanding anything to the

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<PAGE>

contrary contained in this Restated Certificate of Incorporation, the
Corporation may not incur any indebtedness for money borrowed (unless the
proceeds of such incurrence of indebtedness are used to make all overdue
redemptions) or borrow or reborrow any amounts under any lines of credit which
it may then have outstanding without the prior written consent of the holders of
not less than a majority of the then outstanding shares of Class F Preferred
Stock voting as a single class.

              g. If the funds of the Corporation legally available for
redemption of shares of Class F Preferred Stock on a redemption are insufficient
to redeem the total number of shares of Class F Preferred Stock submitted for
redemption, those funds which are legally available will be used to redeem the
maximum possible number of whole shares ratably among the holders of such
shares. The shares of Class F Preferred Stock not redeemed shall remain
outstanding and entitled to all rights and preferences provided herein. At any
time thereafter when additional funds of the Corporation are legally available
for the redemption of such shares of Class F Preferred Stock, such funds will be
used, at the end of the next succeeding fiscal quarter, to redeem the balance of
such shares, or such portion thereof for which funds are then legally available.

         7. STATUS OF REACQUIRED SHARES. Shares of Class F Preferred Stock that
have been issued and reacquired in any manner shall (upon compliance with any
applicable provisions of the laws of the State of Delaware) have the status of
authorized and unissued shares of Class F Preferred Stock issuable in series
undesignated as to class and may be redesignated and reissued.

         8. EXCLUSION OF OTHER RIGHTS. Except as may otherwise be required by
law or provided by contract, the shares of Class F Preferred Stock shall not
have any preferences or relative, participating, optional or other special
rights, other than those specifically set forth in this Fourth Amended and
Restated Certificate of Incorporation.

         9. IDENTICAL RIGHTS. Each share of the Class F Preferred Stock shall
have the same relative rights and preferences as, and shall be identical in all
respects with, all other shares of the Class F Preferred Stock.

         10. CERTIFICATES. So long as any shares of the Class F Preferred Stock
are outstanding, there shall be set forth on the face or back of each stock
certificate issued by the Corporation a statement that the Corporation shall
furnish without charge to each shareholder who so requests, a full statement of
the designation and relative rights, preferences and limitations of each class
of stock or series thereof that the Corporation is authorized to issue and of
the authority of the Board of Directors to designate and fix the relative
rights, preferences and limitations of each series.

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<PAGE>

         11. RANK. Except as otherwise provided herein, the Class F Preferred
Stock shall rank senior to the Common Stock, Class A Preferred Stock, Class B
Preferred Stock, Class C Preferred Stock, Class D Preferred Stock and Class E
Preferred Stock in right as to dividends, and upon liquidating dissolution or
winding up of the Company.

         12. NONPARTICIPATING HOLDERS. As used herein, "NONPARTICIPATING HOLDER"
means any holder of Class F Preferred Stock that is provided an opportunity to
purchase its Pro Rata Portion (as defined below) of the first offering of Class
F Senior Preferred Stock or Class F Parity Preferred Stock (the principal
purpose of such offering being to raise capital) made subsequent to such
holder's acquisition of Class F Preferred Stock and that fails to purchase its
Pro Rata Portion of such of Class F Senior Preferred Stock or Class F Parity
Preferred Stock. A holder's "PRO RATA PORTION" of such Class F Senior Preferred
Stock or Class F Parity Preferred Stock means the aggregate number of Class F
Senior Preferred Stock or Class F Parity Preferred Stock which the Board of
Directors of the Corporation, subject to satisfaction of applicable preemptive
rights or rights of first refusal, determines to issue in such offering to all
existing holders of Common Stock and Preferred Stock, multiplied by a fraction,
the numerator of which is the sum of the number of shares of Common Stock issued
to such holder (or its predecessor holder) prior to the date such offering
commences plus the number of shares of Common Stock issuable upon conversion of
all shares of Preferred Stock of the Corporation held by such holder at the time
such offering commences, and the denominator of which is the sum of the number
of shares of Common Stock issued and outstanding immediately prior to the date
such offering commences plus the number of shares of Common Stock issuable upon
conversion of all shares of Preferred Stock of the Corporation held by all
holders of Preferred Stock at the time such offering commences and upon exercise
of all outstanding options and warrants issued by the Corporation. For purposes
of this Section 12, a holder of Common Stock and/or Preferred Stock shall be
deemed to have purchased Common Stock and/or Preferred Stock purchased by an
"affiliate" (as defined in Rule 144 under the Securities Act of 1933, as
amended, or any successor rule) of such holder, and a holder shall be deemed to
have had the opportunity to purchase such Class F Parity Preferred Stock or
Class F Senior Preferred Stock if (i) the Corporation provides such holder with
a written notice setting forth the type and number of Class F Parity Preferred
Stock or Class F Senior Preferred Stock being offered, a description of the
principal terms of any Class F Parity Preferred Stock or Class F Senior
Preferred Stock, the proposed purchase price for such Class F Parity Preferred
Stock or Class F Senior Preferred Stock and the proposed closing date for such
offering of such Class F Parity Preferred Stock or Class F Senior Preferred
Stock and (ii) such holder is provided at least 15 days after the delivery of
such notice in which to agree to acquire its Pro Rata Portion of such Class F
Parity Preferred Stock or Class F Senior Preferred Stock.

         FIFTH: In furtherance of and not in limitation of powers conferred by
statute, it is further provided:

              1. Election of directors need not be by written ballot.

              2. The Board of Directors is expressly authorized to adopt, amend
or repeal the By-Laws of the Corporation.

                                      -65-

<PAGE>

         SIXTH: Except to the extent that the General Corporation Law of
Delaware prohibits the elimination or limitation of liability of directors for
breaches of fiduciary duty, no director of the Corporation shall be personally
liable to the Corporation or its stockholders for monetary damages for any
breach of fiduciary duty as a director, notwithstanding any provision of law
imposing such liability. No amendment to or repeal of this provision shall apply
to or have any effect on the liability or alleged liability of any director of
the Corporation for or with respect to any acts or omissions of such director
occurring prior to such amendment.

         SEVENTH: The Corporation shall, to the fullest extent permitted by
Section 145 of the General Corporation Law of Delaware, as amended from time to
time, indemnify each person who was or is a party or is threatened to be made a
party to any threatened, pending or completed action, suit or proceeding,
whether civil, criminal, administrative or investigative, by reason of the fact
that he is or was, or has agreed to become, a director or officer of the
Corporation, or is or was serving, or has agreed to serve, at the request of the
Corporation, as a director, officer or trustee of, or in a similar capacity
with, another corporation, partnership, joint venture, trust or other enterprise
(including any employee benefit plan) (all such persons being referred to
hereafter as an "Indemnitee"), or by reason of any action alleged to have been
taken or omitted in such capacity, against all expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by or on behalf of an Indemnitee in connection with such action, suit
or proceeding and any appeal therefrom.

         As a condition precedent to his right to be indemnified, the Indemnitee
must notify the Corporation in writing as soon as practicable of any action,
suit proceeding or investigation involving him for which indemnity will or could
be sought. With respect to any action, suit, proceeding or investigation of
which the Corporation is so notified, the Corporation will be entitled to
participate therein at its own expense and/or to assume the defense thereof at
its own expense, with legal counsel reasonably acceptable to the Indemnitee.

         In the event that the Corporation does not assume the defense of any
action, suit, proceeding or investigation of which the Corporation receives
notice under this Article, the Corporation shall pay in advance of the final
disposition of such matter any expenses (including attorneys' fees) incurred by
an indemnitee in defending a civil or criminal action, suit, proceeding or
investigation or any appeal therefrom; PROVIDED, however, that the payment of
such expenses incurred by an Indemnitee in advance of the final disposition of
such matter shall be made only upon receipt of an undertaking by or on behalf of
the Indemnitee to repay all amounts so advanced in the event that it shall
ultimately be determined that the Indemnitee is not entitled to be indemnified
by the Corporation as authorized in this Article, which undertaking shall be
accepted without reference to the financial ability of the Indemnitee to make
such repayment; and FURTHER PROVIDED that no such advancement of expenses shall
be made if it is determined that the Indemnitee did not act in good faith and in
a manner he reasonably believed to be in, or not opposed to, the best interests
of the Corporation, and, with respect to any criminal action or proceeding, had
no reasonable cause to believe his conduct was unlawful.

                                      -66-

<PAGE>

         The Corporation shall not indemnify an Indemnitee seeking
indemnification in connection with a proceeding (or part thereof) initiated by
such Indemnitee unless the initiation thereof was approved by the Board of
Directors of the Corporation. In addition, the Corporation shall not indemnify
an Indemnitee to the extent such Indemnitee is reimbursed from the proceeds of
insurance, and in the event the Corporation makes any indemnification payments
to an Indemnitee and such Indemnitee is subsequently reimbursed from the
proceeds of insurance, such Indemnitee shall promptly refund such
indemnification payments to the Corporation to the extent of such insurance
reimbursement.

         All determinations hereunder as to the entitlement of an Indemnitee to
indemnification or advancement of expenses shall be made in each instance by (a)
a majority vote of the directors of the Corporation consisting of persons who
are not at that time parties to the action, suit or proceeding in question
("disinterested directors"), whether or not a quorum, (b) a majority vote of a
quorum of the outstanding shares of stock of all classes entitled to vote for
directors, voting as a single class, which quorum shall consist of stockholders
who are not at that time parties to the action, suit or proceeding in question,
(c) independent legal counsel (who may, to the extent permitted by law, be
regular legal counsel to the Corporation), or (d) a court of competent
jurisdiction.

         The Indemnification rights provided in this Article (i) shall not be
deemed exclusive of any other rights to which an Indemnitee may be entitled
under any law, agreement or vote of stockholders or disinterested directors or
otherwise, and (ii) shall inure to the benefit of the heirs, executors and
administrators of the Indemnitees. The Corporation may, to the extent authorized
from time to time by its Board of Directors, grant indemnification rights to
other employees or agents of the Corporation or other persons serving the
Corporation and such rights may be equivalent to, or greater or less than, those
set forth in this Article.

         EIGHTH: Subject to the approval rights of holders of Common Stock or
Preferred Stock set forth in this Restated Certificate, the Corporation reserves
the right to amend, alter, change or repeal any provision contained in this
Restated Certificate of Incorporation, in the manner now or hereafter prescribed
by statute and this Restated Certificate of Incorporation, and all rights
conferred upon stockholders herein are granted subject to this reservation.

                                      -67

<PAGE>

     EXECUTED at Woburn, Massachusetts, on May 23, 2000.

                                        /s/ Maureen Lister
                                        ---------------------------------------
                                        Maureen Lister, Secretary

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