Document:

EXHIBIT 4.7
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                          REGISTRATION RIGHTS AGREEMENT
                          -----------------------------

                  This Registration Rights Agreement (this "Agreement") is made
and entered into as of July 17, 2000, among Dynagen, Inc., a Delaware
corporation (the "Company"), and the investors signatory hereto (each such
investor is a "Purchaser" and all such investors are, collectively, the
"Purchasers").

                  This Agreement is made pursuant to the Convertible Preferred
Stock Purchase Agreement, dated as of the date hereof among the Company and the
Purchasers (the "Purchase Agreement").

                  The Company and the Purchasers hereby agree as follows:

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

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

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

                  "Certificate of Designation" shall have the meaning set forth
in the Purchase Agreement.

                  "Closing Date" shall have the meaning set forth in the
Purchase Agreement.

                  "Commission" means the Securities and Exchange Commission.

                  "Common Stock" means the Company's common stock, $.01 par
value per share, or such securities that such stock shall hereafter be
reclassified into.

                  "Effectiveness Date" means the 120th day following the Closing
Date.

                  "Effectiveness Period" shall have the meaning set forth in
Section 2(a).
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                  "Exchange Act" means the Securities Exchange Act of 1934, as
amended.

                  "Filing Date" means the 60th day following the Closing Date.

                  "Holder" or "Holders" means the holder or holders, as the case
may be, from time to time of Registrable Securities.

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

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

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

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

                  "Preferred Stock" means the Company's 4% Series M Convertible
Preferred Stock issued to the Purchasers in accordance with the Purchase
Agreement.

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

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

                  "Registrable Securities" means the shares of Common Stock
issuable upon conversion in full of the Preferred Stock.

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

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

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

                  "Rule 424" means Rule 424 promulgated by the Commission
pursuant to the Securities Act, as such Rule may be amended from time to time,
or any similar rule or regulation hereafter adopted by the Commission having
substantially the same effect as such Rule.

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

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

          2.      Shelf Registration
                  ------------------

                  (a) On or prior to the Filing Date, the Company shall prepare
and file with the Commission a "Shelf" Registration Statement covering the
resale of all Registrable Securities for an offering to be made on a continuous
basis pursuant to Rule 415. The Registration Statement shall be on Form S-3
(except if the Company is not then eligible to register for resale the
Registrable Securities on Form S-3, in which case such registration shall be on
another appropriate form in accordance herewith as the Holders may consent) and
shall contain (except if otherwise directed by the Holders) the "Plan of
Distribution" attached hereto as Annex A, and cause the Registration Statement
to become effective and remain effective as provided herein. The Company shall
use its best efforts to cause the Registration Statement to be declared
effective under the Securities Act as promptly as possible after the filing
thereof, but in any event prior to the Effectiveness Date, and shall use its
best efforts to keep such Registration Statement continuously effective under
the Securities Act until the date which is two years after the date that such
Registration Statement is declared effective by the Commission or such earlier
date when all Registrable Securities covered by such Registration Statement have
been sold or may be sold without volume restrictions pursuant to Rule 144(k) as
determined by the counsel to the Company pursuant to a written opinion letter to
such effect, addressed and acceptable to the Company's transfer agent and the
affected Holders (the "Effectiveness Period"), provided, that the Company shall
not be deemed to have used its best efforts to keep the Registration Statement
effective during the Effectiveness Period if it voluntarily takes any action
that would result in the Holders not being able to sell the Registrable
Securities covered by such Registration Statement during the Effectiveness
Period, unless such action is required under applicable law or the Company has
filed a post-effective amendment to the Registration Statement and the
Commission has not declared it effective.

                  (b) The initial Registration Statement required to be filed
hereunder shall include (but not be limited to) a number of shares of Common
Stock equal to no less than 200% of the number of shares of Common Stock
issuable upon conversion in full of the outstanding Preferred Stock, assuming
for such purposes that such shares of Preferred Stock are outstanding for five
years, that all accrued dividends are added to the Stated Value (as defined in
the Certificate of Designation) and that such conversion occurred on the Closing
Date, the Filing Date or the Trading Day preceding the date the Company files an
acceleration request with the Commission relating to the Registration

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<PAGE>

Statement, whichever yields the lowest Conversion Price (as defined in the
Certificate of Designation).

                  (c) If (a) the initial Registration Statement is not filed on
or prior to the Filing Date (if the Company files such Registration Statement
without affording the Holder the opportunity to review and comment on the same
as required by Section 3(a) hereof, the Company shall not be deemed to have
satisfied this clause (a)), or (b) the Company fails to file with the Commission
a request for acceleration in accordance with Rule 461 promulgated under the
Securities Act, within five days of the date that the Company is notified
(orally or in writing, whichever is earlier) by the Commission that a
Registration Statement will not be "reviewed," or not subject to further review,
or (c) the initial Registration Statement filed hereunder is not declared
effective by the Commission on or prior to the Effectiveness Date, or (d) after
a Registration Statement is filed with and declared effective by the Commission,
such Registration Statement ceases to be effective as to all Registrable
Securities at any time prior to the expiration of the Effectiveness Period
without being succeeded within ten Business Days by an amendment to such
Registration Statement or by a subsequent Registration Statement filed with and
declared effective by the Commission, or (e) the Common Stock shall not be
quoted on the OTC Bulletin Board ("OTC") or shall be suspended or delisted from
trading on either the American Stock Exchange, the New York Stock Exchange,
Nasdaq National Market or Nasdaq Smallcap Market (each, a "Subsequent Market")
for more than three days (which need not be consecutive days), or (f) the
conversion rights of the Holders pursuant to the Certificate of Designation are
suspended for any reason, or (g) an amendment to a Registration Statement is not
filed by the Company with the Commission within ten Business Days of the
Commission's notifying the Company that such amendment is required in order for
such Registration Statement to be declared effective (any such failure or breach
being referred to as an "Event," and for purposes of clauses (a), (c), (f) the
date on which such Event occurs, or for purposes of clause (b) the date on which
such five day period is exceeded, or for purposes of clauses (d) and (g) the
date which such ten Business Day-period is exceeded, or for purposes of clause
(e) the date on which such three day-period is exceeded, being referred to as
"Event Date"), then, on each such Event Date and every monthly anniversary
thereof until the applicable Event is cured,, the Company shall pay to each
Holder an amount in cash or kind, as liquidated damages and not as penalty,
equal to 1.5% of the purchase price paid by such Holder pursuant to the Purchase
Agreement. If the Company fails to pay any liquidated damages pursuant to this
Section in full within seven days after the date payable, the Company will pay
interest thereon at a rate of 18% per annum (or such lesser maximum amount that
is permitted to be paid by applicable law) to the Holder, accruing daily from
the date such liquidated damages are due until such amounts, plus all such
interest thereon, are paid in full. The liquidated damages pursuant to the terms
hereof shall apply on a pro-rata basis for any portion of a month prior to the
cure of an Event.

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

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

                  (a) Not less than five Business Days prior to the filing of
the Registration Statement or any related Prospectus or any amendment or
supplement thereto (including any document that would be incorporated or deemed
to be incorporated therein by reference), the

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Company shall, (i) furnish to the Holders and their Special Counsel copies of
all such documents proposed to be filed, which documents (other than those
incorporated or deemed to be incorporated by reference) will be subject to the
review of such Holders and their Special Counsel which will provide the Company
with any comments thereto in a reasonably prompt manner, and (ii) cause its
officers and directors, counsel and independent certified public accountants to
respond to such inquiries as shall be necessary, in the reasonable opinion of
respective counsel to conduct a reasonable investigation within the meaning of
the Securities Act. The Company shall not file the Registration Statement or any
such Prospectus or any amendments or supplements thereto to which the Holders of
a majority of the Registrable Securities and their Special Counsel shall
reasonably object.

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

                  (c) File additional Registration Statements if the number of
Registrable Securities at any time exceeds 85% of the number of shares of Common
Stock then registered in a Registration Statement. The Company shall have twenty
days to file such additional Registration Statements after notice of such
requirement is given by the Holders.

                  (d) Notify the Holders of Registrable Securities to be sold
and their Special Counsel as promptly as reasonably possible (and, in the case
of (i)(A) below, not less than five Business Days prior to such filing) and (if
requested by any such Person) confirm such notice in writing no later than one
Business Day following the day (i)(A) when a Prospectus or any Prospectus
supplement or post-effective amendment to the Registration Statement is proposed
to be filed; (B) when the Commission notifies the Company whether there will be
a "review" of such Registration Statement and whenever the Commission comments
in writing on such Registration Statement (the Company shall provide true and
complete copies thereof and all written responses thereto to each of the
Holders); and (C) with respect to the Registration Statement or any
post-effective amendment, when the same has become effective; (ii) of any
request by the Commission or any other Federal or state governmental authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional information; (iii) of the issuance by the Commission of any stop
order suspending the effectiveness of the Registration Statement covering any or
all of the Registrable

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Securities or the initiation of any Proceedings for that purpose; (iv) if at any
time any of the representations and warranties of the Company contained in any
agreement contemplated hereby ceases 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 or exemption from qualification of any of
the Registrable Securities for sale in any jurisdiction, or the initiation or
threatening of any Proceeding for such purpose; and (vi) of the occurrence of
any event or passage of time that makes the financial statements included in the
Registration Statement ineligible for inclusion therein or any statement made in
the Registration Statement or Prospectus or any document incorporated or deemed
to be incorporated therein by reference untrue in any material respect or that
requires any revisions to the Registration Statement, Prospectus or other
documents so that, in the case of the Registration Statement or the Prospectus,
as the case may be, it will not contain any untrue statement of a material fact
or omit to state any material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading.

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

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

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

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

                  (i) Cooperate with the Holders to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to
be delivered to a transferee pursuant to a

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Registration Statement, which certificates shall be free, to the extent
permitted by the Purchase Agreement, of all restrictive legends, and to enable
such Registrable Securities to be in such denominations and registered in such
names as any such Holders may request.

                  (j) Upon the occurrence of any event contemplated by Section
3(d)(vi), as promptly as reasonably possible, prepare a supplement or amendment,
including a post-effective amendment, to the Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to
be incorporated therein by reference, and file any other required document so
that, as thereafter delivered, neither the Registration Statement nor such
Prospectus will contain an untrue statement of a material fact or omit to state
a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.

                  (k) Comply with all applicable rules and regulations of the
Commission.

                  (l) The Company may require each selling Holder to furnish to
the Company a certified statement as to the number of shares of Common Stock
beneficially owned by such Holder and, if requested by the Commission, the
controlling person thereof.

          4.      Registration Expenses. All fees and expenses incident to the
performance of or compliance with this Agreement by the Company shall be borne
by the Company whether or not any Registrable Securities are sold pursuant to
the Registration Statement. The fees and expenses referred to in the foregoing
sentence shall include, without limitation, (i) all registration and filing fees
(including, without limitation, fees and expenses (A) with respect to filings
required to be made with any Subsequent Market on which the Common Stock is then
listed for trading, and (B) in compliance with applicable state securities or
Blue Sky laws (including, without limitation, fees and disbursements of counsel
for the Holders in connection with Blue Sky qualifications or exemptions of the
Registrable Securities and determination of the eligibility of the Registrable
Securities for investment under the laws of such jurisdictions as the Holders of
a majority of Registrable Securities may designate)), (ii) printing expenses
(including, without limitation, expenses of printing certificates for
Registrable Securities and of printing prospectuses if the printing of
prospectuses is requested by the holders of a majority of the Registrable
Securities included in the Registration Statement), (iii) messenger, telephone
and delivery expenses, (iv) fees and disbursements of counsel for the Company
and Special Counsel for the Holders, (v) Securities Act liability insurance, if
the Company so desires such insurance, and (vi) fees and expenses of all other
Persons retained by the Company in connection with the consummation of the
transactions contemplated by this Agreement. In addition, the Company shall be
responsible for all of its internal expenses incurred in connection with the
consummation of the transactions contemplated by this Agreement (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), the expense of any annual audit and the
fees and expenses incurred in connection with the listing of the Registrable
Securities on any securities exchange as required hereunder.

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

                  (a) Indemnification by the Company. The Company shall,
notwithstanding any termination of this Agreement, indemnify and hold harmless
each Holder, the officers, directors, agents, brokers (including brokers who
offer and sell Registrable Securities as principal as a result of a pledge or
any failure to perform under a margin call of Common Stock), investment advisors
and employees of each of them, each Person who controls any such Holder (within
the meaning of Section 15 of the Securities Act or Section 20 of the Exchange
Act) and the officers, directors, agents and employees of each such controlling
Person, to the fullest extent permitted by applicable law, from and against any
and all losses, claims, damages, liabilities, costs (including, without
limitation, costs of preparation and attorneys' fees) and expenses
(collectively, "Losses"), as incurred, arising out of or relating to any untrue
or alleged untrue statement of a material fact contained in the Registration
Statement, any Prospectus or any form of prospectus or in any amendment or
supplement thereto or in any preliminary prospectus, or arising out of or
relating to any omission or alleged omission of a material fact required to be
stated therein or necessary to make the statements therein (in the case of any
Prospectus or form of prospectus or supplement thereto, in light of the
circumstances under which they were made) not misleading, except to the extent,
but only to the extent, that (1) such untrue statements or omissions are based
solely upon information regarding such Holder furnished in writing to the
Company by such Holder expressly for use therein, or to the extent that such
information relates to such Holder or such Holder's proposed method of
distribution of Registrable Securities and was reviewed and expressly approved
in writing by such Holder expressly for use in the Registration Statement, such
Prospectus or such form of Prospectus or in any amendment or supplement thereto
or (2) in the case of an occurrence of an event of the type specified in Section
3(d)(ii)-(vi), the use by such Holder of an outdated or defective Prospectus
after the Company has notified such Holder in writing that the Prospectus is
outdated or defective and prior to the receipt by such Holder of the Advice
contemplated in Section 6(e). The Company shall notify the Holders promptly of
the institution, threat or assertion of any Proceeding of which the Company is
aware in connection with the transactions contemplated by this Agreement.

                  (b) Indemnification by Holders. Each Holder shall, severally
and not jointly, indemnify and hold harmless the Company, its directors,
officers, agents and employees, each Person who controls the Company (within the
meaning of Section 15 of the Securities Act and Section 20 of the Exchange Act),
and the directors, officers, agents or employees of such controlling Persons, to
the fullest extent permitted by applicable law, from and against all Losses (as
determined by a court of competent jurisdiction in a final judgment not subject
to appeal or review) arising solely out of or based solely upon any untrue
statement of a material fact contained in any Registration Statement, any
Prospectus, or any form of prospectus, or in any amendment or supplement
thereto, or arising solely out of or based solely upon any omission of a
material fact required to be stated therein or necessary to make the statements
therein not misleading to the extent, but only to the extent, that such untrue
statement or omission is contained in any information so furnished in writing by
such Holder to the Company specifically for inclusion in such Registration
Statement or such Prospectus or to the extent that (1) such untrue statements or
omissions are based solely upon information regarding such Holder furnished in
writing to the Company by such Holder expressly for use therein, or to the
extent that such information relates to such Holder or such Holder's proposed
method of distribution of Registrable Securities and was reviewed and expressly
approved in writing by such Holder expressly for use in the Registration
Statement, such Prospectus or such form

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<PAGE>

of Prospectus or in any amendment or supplement thereto or (2) in the case of an
occurrence of an event of the type specified in Section 3(d)(ii)-(vi), the use
by such Holder of an outdated or defective Prospectus after the Company has
notified such Holder in writing that the Prospectus is outdated or defective and
prior to the receipt by such Holder of the Advice contemplated in Section 6(e).
In no event shall the liability of any selling Holder hereunder be greater in
amount than the dollar amount of the net proceeds received by such Holder upon
the sale of the Registrable Securities giving rise to such indemnification
obligation.

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

                  An Indemnified Party shall have the right to employ separate
counsel in any such Proceeding and to participate in the defense thereof, but
the fees and expenses of such counsel shall be at the expense of such
Indemnified Party or Parties unless: (1) the Indemnifying Party has agreed in
writing to pay such fees and expenses; or (2) the Indemnifying Party shall have
failed promptly to assume the defense of such Proceeding and to employ counsel
reasonably satisfactory to such Indemnified Party in any such Proceeding; or (3)
the named parties to any such Proceeding (including any impleaded parties)
include both such Indemnified Party and the Indemnifying Party, and such
Indemnified Party shall have been advised by counsel that a conflict of interest
is likely to exist if the same counsel were to represent such Indemnified Party
and the Indemnifying Party (in which case, if such Indemnified Party notifies
the Indemnifying Party in writing that it elects to employ separate counsel at
the expense of the Indemnifying Party, the Indemnifying Party shall not have the
right to assume the defense thereof and such counsel shall be at the expense of
the Indemnifying Party). The Indemnifying Party shall not be liable for any
settlement of any such Proceeding effected without its written consent, which
consent shall not be unreasonably withheld. No Indemnifying Party shall, without
the prior written consent of the Indemnified Party, effect any settlement of any
pending Proceeding in respect of which any Indemnified Party is a party, unless
such settlement includes an unconditional release of such Indemnified Party from
all liability on claims that are the subject matter of such Proceeding.

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

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<PAGE>

to reimburse all such fees and expenses to the extent it is finally judicially
determined that such Indemnified Party is not entitled to indemnification
hereunder).

                  (d) Contribution. If a claim for indemnification under Section
5(a) or 5(b) is unavailable to an Indemnified Party (by reason of public policy
or otherwise), then each Indemnifying Party, in lieu of indemnifying such
Indemnified Party, shall contribute to the amount paid or payable by such
Indemnified Party as a result of such Losses, in such proportion as is
appropriate to reflect the relative fault of the Indemnifying Party and
Indemnified Party in connection with the actions, statements or omissions that
resulted in such Losses as well as any other relevant equitable considerations.
The relative fault of such Indemnifying Party and Indemnified Party shall be
determined by reference to, among other things, whether any action in question,
including any untrue or alleged untrue statement of a material fact or omission
or alleged omission of a material fact, has been taken or made by, or relates to
information supplied by, such Indemnifying Party or Indemnified Party, and the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent such action, statement or omission. The amount paid or
payable by a party as a result of any Losses shall be deemed to include, subject
to the limitations set forth in Section 5(c), any reasonable attorneys' or other
reasonable fees or expenses incurred by such party in connection with any
Proceeding to the extent such party would have been indemnified for such fees or
expenses if the indemnification provided for in this Section was available to
such party in accordance with its terms.

                  The parties hereto agree that it would not be just and
equitable if contribution pursuant to this Section 5(d) were determined by pro
rata allocation or by any other method of allocation that does not take into
account the equitable considerations referred to in the immediately preceding
paragraph. Notwithstanding the provisions of this Section 5(d), no Holder shall
be required to contribute, in the aggregate, any amount in excess of the amount
by which the proceeds actually received by such Holder from the sale of the
Registrable Securities subject to the Proceeding exceeds the amount of any
damages that such Holder has otherwise been required to pay by reason of such
untrue or alleged untrue statement or omission or alleged omission.

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

          6.      Miscellaneous

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

                  (b) No Inconsistent Agreements. Neither the Company nor any of
its subsidiaries has entered, as of the date hereof, nor shall the Company or
any of its subsidiaries, on or after the

                                      -10-
<PAGE>

date of this Agreement, enter into any agreement with respect to its securities
that is inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof. Except as and to the extent
specified in Schedule 6(b) hereto, neither the Company nor any of its
subsidiaries has previously entered into any agreement granting any registration
rights with respect to any of its securities to any Person.

                  (c) No Piggyback on Registrations. Except as and to the extent
specified in Schedule 6(b) hereto, neither the Company nor any of its security
holders (other than the Holders in such capacity pursuant hereto) may include
securities of the Company in the Registration Statement other than the
Registrable Securities, and the Company shall not after the date hereof enter
into any agreement providing any such right to any of its security holders.

                  (d) Compliance. Each Holder covenants and agrees that it will
comply with the prospectus delivery requirements of the Securities Act as
applicable to it in connection with sales of Registrable Securities pursuant to
the Registration Statement.

                  (e) Discontinued Disposition. Each Holder agrees by its
acquisition of such Registrable Securities that, upon receipt of a notice from
the Company of the occurrence of any event of the kind described in Sections
3(d)(ii), 3(d)(iii), 3(d)(iv), 3(d)(v) or 3(d)(vi), such Holder will forthwith
discontinue disposition of such Registrable Securities under the Registration
Statement until such Holder's receipt of the copies of the supplemented
Prospectus and/or amended Registration Statement contemplated by Section 3(j),
or until it is advised in writing (the "Advice") by the Company that the use of
the applicable Prospectus may be resumed, and, in either case, has received
copies of any additional or supplemental filings that are incorporated or deemed
to be incorporated by reference in such Prospectus or Registration Statement.
The Company may provide appropriate stop orders to enforce the provisions of
this paragraph.

                  (f) Piggy-Back Registrations. If at any time during the
Effectiveness Period there is not an effective Registration Statement covering
all of the Registrable Securities and the Company shall determine to prepare and
file with the Commission a registration statement relating to an offering for
its own account or the account of others under the Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents relating to equity securities to
be issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee
benefit plans, then the Company shall send to each Holder written notice of such
determination and, if within fifteen days after receipt of such notice, any such
Holder shall so request in writing, the Company shall include in such
registration statement all or any part of such Registrable Securities such
holder requests to be registered.

                  (g) Amendments and Waivers. The provisions of this Agreement,
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and the Holders of at least two-thirds of the then outstanding Registrable
Securities. Notwithstanding the foregoing, a waiver or consent to depart from
the provisions hereof with respect to a matter that relates exclusively to the
rights of Holders and that does not directly or indirectly affect the rights of
other Holders may be given by Holders of at least a majority of the

                                      -11-
<PAGE>

Registrable Securities to which such waiver or consent relates; provided,
however, that the provisions of this sentence may not be amended, modified, or
supplemented except in accordance with the provisions of the immediately
preceding sentence.

                  (h) Notices. Any and all notices or other communications or
deliveries required or permitted to be provided hereunder shall be in writing
and shall be deemed given and effective on the earliest of (i) the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in this Section prior to 6:30 p.m. (New
York City time) on a Business Day, (ii) the Business Day after the date of
transmission, if such notice or communication is delivered via facsimile at the
facsimile telephone number specified in the Purchase Agreement later than 6:30
p.m. (New York City time) on any date and earlier than 11:59 p.m. (New York City
time) on such date, (iii) the Business Day following the date of mailing, if
sent by nationally recognized overnight courier service, or (iv) upon actual
receipt by the party to whom such notice is required to be given. The address
for such notices and communications shall be as follows:

          If to the Company:        DynaGen, Inc.
                                    1000 Winter Street, Suite 2700
                                    Waltham, MA 02451
                                    Facsimile No.: (781) 890-0118
                                    Attn: Chief Financial Officer

          With copies to:           Foley, Hoag & Eliot LLP
                                    One Post Office Square
                                    Boston, Massachusetts
                                    Facsimile No.: (617) 832-7000
                                    Attn: David Broadwin

          If to a Purchaser:        To the address set forth under such
                                    Purchaser's name on the signature
                                    pages hereto.

          If to any other Person who is then the registered Holder:

                                    To the address of such Holder as it appears
                                    in the stock transfer books of the Company

or such other address as may be designated in writing hereafter, in the same
manner, by such Person.

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

                  (j) Counterparts. This Agreement may be executed in any number
of counterparts, each of which when so executed shall be deemed to be an
original and, all of which

                                      -12-
<PAGE>

taken together shall constitute one and the same Agreement. In the event that
any signature is delivered by facsimile transmission, such signature shall
create a valid binding obligation of the party executing (or on whose behalf
such signature is executed) the same with the same force and effect as if such
facsimile signature were the original thereof.

                  (k) Governing Law. All questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed and enforced in accordance with the internal laws of the State of
New York, without regard to the principles of conflicts of law thereof. Each
party hereby irrevocably submits to the exclusive jurisdiction of the state and
federal courts sitting in the City of New York, borough of Manhattan, for the
adjudication of any dispute hereunder or in connection herewith or with any
transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim
that it is not personally subject to the jurisdiction of any such court, that
such suit, action or proceeding is improper. Each party hereby irrevocably
waives personal service of process and consents to process being served in any
such suit, action or proceeding by mailing a copy thereof to such party at the
address in effect for notices to it under this Agreement and agrees that such
service shall constitute good and sufficient service of process and notice
thereof. Nothing contained herein shall be deemed to limit in any way any right
to serve process in any manner permitted by law.

                  (l) Cumulative Remedies. The remedies provided herein are
cumulative and not exclusive of any remedies provided by law.

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

                  (n) Headings. The headings in this Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof.

                  (o) Shares Held by the Company and its Affiliates. Whenever
the consent or approval of Holders of a specified percentage of Registrable
Securities is required hereunder, Registrable Securities held by the Company or
its Affiliates (other than any Holder or transferees or successors or assigns
thereof if such Holder is deemed to be an Affiliate solely by reason of its
holdings of such Registrable Securities) shall not be counted in determining
whether such consent or approval was given by the Holders of such required
percentage.

                  (p) Independent Nature of Purchasers' Obligations and Rights.
The obligations of each Purchaser hereunder is several and not joint with the
obligations of any other Purchaser

                                      -13-
<PAGE>

hereunder, and no Purchaser shall be responsible in any way for the performance
of the obligations of any other Purchaser hereunder. Nothing contained herein or
in any other agreement or document delivered at any closing, and no action taken
by any Purchaser pursuant hereto or thereto, shall be deemed to constitute the
Purchasers as a partnership, an association, a joint venture or any other kind
of entity, or create a presumption that the Purchasers are in any way acting in
concert with respect to such obligations or the transactions contemplated by
this Agreement. Each Purchaser shall be entitled to protect and enforce its
rights, including without limitation the rights arising out of this Agreement,
and it shall not be necessary for any other Purchaser to be joined as an
additional party in any proceeding for such purpose.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                           SIGNATURE PAGES TO FOLLOW]

                                      -14-
<PAGE>

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

                                    DYNAGEN, INC.

                                    By: ___________________________
                                        Name:
                                        Title:

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                     SIGNATURE PAGES OF PURCHASER TO FOLLOW]

                                      -15-
<PAGE>

                               KENILWORTH LLC

                               By:  ______________________________
                                    Name:
                                    Title:

                               Address for Notice:

                               Kenilworth LLC
                               c/o Citco Trustees (Cayman) Limited
                               Commercial Centre
                               P.O. Box 31106 SMB
                               Grand Cayman
                               Cayman Islands
                               British West Indies
                               Facsimile No.: (345) 945-7566

                               With copies to:

                               Robinson Silverman Pearce Aronsohn & Berman LLP
                               1290 Avenue of the Americas
                               New York, NY  10104
                               Facsimile No.:  (212) 541-4630 and (212) 541-1432
                               Attn:  Eric L. Cohen, Esq.

                   [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
                      SIGNATURE PAGE FOR PURCHASER FOLLOWS]

                                      -16-
<PAGE>

                                                                         Annex A
                              PLAN OF DISTRIBUTION
                              --------------------

         The Selling Stockholders and any of their pledgees, assignees and
successors-in-interest may, from time to time, sell any or all of their shares
of Common Stock on any stock exchange, market or trading facility on which the
shares are traded or in private transactions. These sales may be at fixed or
negotiated prices. The Selling Stockholders may use any one or more of the
following methods when selling shares:

o        ordinary brokerage transactions and transactions in which the
         broker-dealer solicits purchasers;

o        block trades in which the broker-dealer will attempt to sell the shares
         as agent but may position and resell a portion of the block as
         principal to facilitate the transaction;

o        purchases by a broker-dealer as principal and resale by the
         broker-dealer for its account;

o        an exchange distribution in accordance with the rules of the applicable
         exchange;

o        privately negotiated transactions;

o        short sales;

o        broker-dealers may agree with the Selling Stockholders to sell a
         specified number of such shares at a stipulated price per share;

o        a combination of any such methods of sale; and

o        any other method permitted pursuant to applicable law.

         The Selling Stockholders may also sell shares under Rule 144 under the
Securities Act, if available, rather than under this prospectus.

         The Selling Stockholders may also engage in short sales against the
box, puts and calls and other transactions in securities of the Company or
derivatives of Company securities and may sell or deliver shares in connection
with these trades. The Selling Stockholders may pledge their shares to their
brokers under the margin provisions of customer agreements. If a Selling
Stockholder defaults on a margin loan, the broker may, from time to time, offer
and sell the pledged shares.

         Broker-dealers engaged by the Selling Stockholders may arrange for
other brokers-dealers to participate in sales. Broker-dealers may receive
commissions or discounts from the Selling Stockholders (or, if any broker-dealer
acts as agent for the purchaser of shares, from the purchaser) in amounts to be
negotiated. The Selling Stockholders do not expect these commissions and
discounts to exceed what is customary in the types of transactions involved.

                                      -17-
<PAGE>

         The Selling Stockholders and any broker-dealers or agents that are
involved in selling the shares may be deemed to be "underwriters" within the
meaning of the Securities Act in connection with such sales. In such event, any
commissions received by such broker-dealers or agents and any profit on the
resale of the shares purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act.

         The Company is required to pay all fees and expenses incident to the
registration of the shares, including fees and disbursements of counsel to the
Selling Stockholders. The Company has agreed to indemnify the Selling
Stockholders against certain losses, claims, damages and liabilities, including
liabilities under the Securities Act.

                                      -18-EXHIBIT 4.8
                                                                     -----------

NEITHER THIS WARRANT NOR THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE OF
THIS WARRANT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AND NEITHER
THIS WARRANT NOR SUCH SHARES MAY BE SOLD, ENCUMBERED OR OTHERWISE TRANSFERRED
EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR AN
EXEMPTION FROM SUCH REGISTRATION REQUIREMENT, AND, IF AN EXEMPTION SHALL BE
APPLICABLE, THE HOLDER SHALL HAVE DELIVERED AN OPINION OF COUNSEL ACCEPTABLE TO
THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

VOID UNLESS EXERCISED BEFORE 5:00 P.M., EASTERN STANDARD TIME ON DECEMBER 29,
2003.

                                  DYNAGEN, INC.

                          COMMON STOCK PURCHASE WARRANT

         DYNAGEN, INC., a Delaware corporation (the "COMPANY"), hereby certifies
that, is entitled, subject to the terms set forthbelow, to purchase from the
Company, at any time or from time to time before 5:00 p.m., Eastern Standard
Time, on or before December 29, 2003, fully paid and non-assessable shares of
Common Stock, $.01 par value, of the Company, at an exercise price per share
equal to $0.375. Such exercise price per share as adjusted from time to time as
herein provided is referred to herein as the "EXERCISE PRICE". The number and
character of such shares of Common Stock and the Exercise Price are subject to
adjustment as provided herein. THIS WARRANT IS EXERCISABLE IN INSTALLMENTS,
SUBJECT TO THE SATISFACTION OF CERTAIN CONDITIONS AS SET FORTH IN SECTION 1.3
BELOW. NO PORTION OF THIS WARRANT MAY BE EXERCISED UNLESS SUCH CONDITIONS HAVE
BEEN SATISFIED WITH RESPECT TO THE CONDITIONS REGARDING EXERCISABILITY.

         As used herein the following terms, unless the context otherwise
requires, have the following respective meanings:

         (a)   The term "COMPANY" shall include DynaGen, Inc., a Delaware
corporation, and any corporation which shall succeed or assume the obligations
of the Company hereunder.

         (b)   The term "COMMON STOCK" includes (a) the Company's Common Stock,
$.01 par value per share, as authorized, (b) any other capital stock of any
class or classes (however designated) of the Company, authorized on or after
such date, the holders of which shall have the right, without limitation as to
amount, either to all or to a share of the balance of current dividends and
liquidating dividends after the payment of dividends and distributions on any
shares entitled to preference, and the holders of which shall ordinarily, in the
absence of contingencies, be entitled to vote for the election of a majority of
directors of the Company (even though the right so to vote has been suspended by
the happening of such a contingency), (c) any other securities into which or for
which any of the securities described in (a) or (b) may be converted or
exchanged pursuant to a plan of recapitalization, reorganization, merger, sale
of assets or otherwise, or the conversion of promissory notes or other
obligations of the Company.

<PAGE>

         (c)   The term "OTHER SECURITIES" refers to any stock (other than
Common Stock) and other securities of the Company or any other person (corporate
or otherwise) which the holder of this Warrant at any time shall be entitled to
receive, or shall have received, on the exercise of the Warrant, in lieu of or
in addition to Common Stock, or which at any time shall be issuable or shall
have been issued in exchange for or in replacement of Common Stock or Other
Securities pursuant to Sections 3 or 4 or otherwise.

         1.    EXERCISE OF WARRANT

               1.1. FULL EXERCISE. This Warrant may be exercised in full by the
holder hereof by surrender of this Warrant, with the form of subscription at the
end hereof duly executed by such holder, to the Company at its principal office,
accompanied by payment, in cash or by certified or official bank check payable
to the order of the Company, in the amount obtained by multiplying the number of
shares of Common Stock for which this Warrant is then exercisable by the
Exercise Price then in effect.

               1.2. PARTIAL EXERCISE. This Warrant may be exercised in part by
surrender of this Warrant in the manner and at the place provided in Section 1.1
except that the amount payable by the holder on such partial exercise shall be
the amount obtained by multiplying (a) the number of shares of Common Stock
designated by the holder in the subscription at the end hereof by (b) the
Exercise Price then in effect. On any such partial exercise the Company at its
expense will forthwith issue and deliver to or upon the order of the holder
hereof a new Warrant or Warrants of like tenor, in the name of the holder hereof
or as such holder (upon payment by such holder of any applicable transfer taxes)
may request, calling in the aggregate on the face or faces thereof for the
number of shares of Common Stock for which such Warrant or Warrants may still be
exercised.

               1.3. CONDITIONS REGARDING EXERCISABILITY. Portions of this
Warrant are exercisable only upon the satisfaction of certain conditions, and
unless such conditions are satisfied, only that portion of this Warrant for
which the conditions have been previously satisfied may be exercised at any
time. THE EXACT NUMBER OF SHARES OF COMMON STOCK FOR WHICH THIS WARRANT MAY BE
EXERCISED AT ANY TIME SHALL BE DETERMINED BY THE BOARD OF DIRECTORS OF THE
COMPANY AND SET FORTH IN A NOTICE FROM THE COMPANY TO SCHNEIDER SECURITIES, INC.
THE NUMBER OF SHARES FOR WHICH THIS WARRANT EXERCISABLE AT ANY TIME IS SUBJECT
TO THE SATISFACTORY PERFORMANCE OF SERVICES PURSUANT TO A CERTAIN INVESTMENT
BANKING AGREEMENT BETWEEN THE COMPANY AND SCHNEIDER SECURITIES, INC., NO PORTION
OF THIS WARRANT MAY BE EXERCISED ABSENT THE AFORESAID NOTICE FROM THE COMPANY,
SIGNED BY AN AUTHORIZED OFFICER OF THE COMPANY.

               1.4. NET ISSUANCE. Notwithstanding anything to the contrary
contained in Section 1(a) hereof, in the case of any exercise on or prior to
December , 2000 the Holder may elect to exercise this Warrant in whole or in
part by receiving shares of Common Stock equal to the net issuance value (as
determined below) of this Warrant, or any part hereof as may then be exercised
pursuant to the terms hereof, upon surrender of this Warrant at the principal
office of the Company together with notice of such election (with the form at
the end hereof duly

                                       -2-
<PAGE>

executed), in which event the Company shall issue to the Holder a number of
shares of Common Stock computed using the following formula:

               X = Y (A-B)
                 -------
                    A

         Where:
                  X = the number of shares of Common Stock to be issued
                      to the Holder

                  Y = the number of shares of Common Stock as to which
                      this Warrant is to be exercised

                  A = the daily mean average of the closing price of a share
                      of Common Stock on the ten consecutive trading days before
                      the conversion date

                  B = the Exercise Price

         2.   DELIVERY OF STOCK CERTIFICATES ON EXERCISE. As soon as practicable
after the exercise of this Warrant in full or in part, and in any event within
thirty (30) days thereafter, the Company at its expense (including the payment
by it of any applicable issue taxes) will cause to be issued in the name of and
delivered to the holder hereof, or as such holder (upon payment by such holder
of any applicable transfer taxes) may direct, a certificate or certificates for
the number of fully paid and non-assessable shares of Common Stock (or Other
Securities) to which such holder shall be entitled on such exercise, plus, in
lieu of any fractional share to which such holder would otherwise be entitled,
cash equal to such fraction multiplied by the then current market value of one
full share.

         3.   ADJUSTMENT FOR REORGANIZATION, CONSOLIDATION OR MERGER

              3.1. REORGANIZATION, CONSOLIDATION OR MERGER. In case at any time
or from time to time, the Company shall (a) effect a reorganization, (b)
consolidate with or merge into any other person or entity, or (c) transfer all
or substantially all of its capital stock, properties or assets to any other
person under any plan or arrangement contemplating the dissolution of the
Company, then, in each such case, the holder of this Warrant, on the exercise
hereof as provided in Section 1 at any time after the consummation of such
reorganization, consolidation or merger or the effective date of such
dissolution, as the case may be, shall receive, upon the proper and rightful
exercise of this Warrant, in lieu of the Common Stock (or Other Securities)
issuable on such exercise prior to such consummation or such effective date, the
stock and other securities and property (including cash) to which such holder
would have been entitled upon such consummation or in connection with such
dissolution, as the case may be, if such holder had so exercised this Warrant,
immediately prior thereto, all subject to further adjustment thereafter as
provided in Sections 4 and 5. The holder of this Warrant must exercise this
Warrant prior to the consummation of any of the foregoing events in order to
obtain the benefits of this Section.

                                       -3-
<PAGE>

               3.2. CONTINUATION OF TERMS. Upon any corporate event referred to
in this Section 3, this Warrant shall continue in full force and effect and the
terms hereof shall be applicable to the shares of stock and Other Securities and
property receivable on the exercise of this Warrant after the consummation of
such reorganization, consolidation or merger, as the case may be, and shall be
binding upon the issuer of any such stock or other securities.

         4.    ADJUSTMENTS FOR STOCK DIVIDENDS AND STOCK SPLITS. In the event
that the Company shall (i) issue additional shares of the Common Stock as a
dividend or other distribution on outstanding Common Stock, (ii) subdivide its
outstanding shares of Common Stock, or (iii) combine its outstanding shares of
the Common Stock into a smaller number of shares of the Common Stock, then, in
each such event, the Exercise Price shall, simultaneously with the happening of
such event, be adjusted by multiplying the then prevailing Exercise Price by a
fraction, the numerator of which shall be the number of shares of Common Stock
outstanding immediately prior to such event (calculated assuming the conversion
or exchange of all outstanding shares of convertible or exchangeable securities
of the Company which are convertible or exchangeable into, or exercisable for,
shares of Common Stock) and the denominator of which shall be the number of
shares of Common Stock outstanding immediately after such event (calculated
assuming the conversion or exchange of all outstanding shares of convertible or
exchangeable securities of the Company which are convertible or exchangeable
into, or exercisable for, shares of Common Stock), and the product so obtained
shall thereafter be the Exercise Price then in effect. The Exercise Price, as so
adjusted, shall be readjusted in the same manner upon the happening of any
successive event or events described herein in this Section 4. The holder of
this Warrant shall thereafter, on the exercise hereof as provided in Section 1,
be entitled to receive that number of shares of Common Stock determined by
multiplying the number of shares of Common Stock which would otherwise (but for
the provisions of this Section 4) be issuable on such exercise, by a fraction of
which (i) the numerator is the Exercise Price which would otherwise (but for the
provisions of this Section 4) be in effect, and (ii) the denominator is the
Exercise Price in effect on the date of such exercise.

         5.    ADJUSTMENT FOR DIVIDENDS IN OTHER STOCK, PROPERTY AND
RECLASSIFICATIONS. In case at any time or from time to time, the holders of
Common Stock (or Other Securities) shall have received, or (on or after the
record date fixed for the determination of stockholders eligible to receive)
shall have become entitled to receive, without payment therefor,

               (a) other or additional stock or other securities or property
(other than cash) by way of dividend, or

               (b) other or additional stock or other securities or property
(including cash) by way of spin-off, split-up, reclassification,
recapitalization, combination of shares or similar corporate rearrangement,
other than additional shares of Common Stock (or Other Securities) issued as a
stock dividend or in a stock-split (adjustments in respect of which, in the case
of Common Stock, are provided for in Section 4), then and in each such case the
holder of this Warrant, on the exercise hereof as provided in Section 1, shall
be entitled to receive the amount of other or additional stock and other
securities and property (including cash in the cases referred to in subdivision
(b) of this Section 5) which such holder would hold on the date of such exercise
if on the date of distribution of such other or additional stock or other
securities and property, or on the record date fixed for determining the
shareholders entitled to receive such other or

                                       -4-
<PAGE>

additional stock or other securities and property, such holder had been the
holder of record of the number of shares of Common Stock called for on the face
of this Warrant and had thereafter, during the period from the date thereof to
and including the date of such exercise, retained such shares and all such other
or additional stock and other securities and property (including cash in the
cases referred to in subdivision (b) of this Section 5) receivable by such
holder as aforesaid during such period, giving effect to all adjustments called
for during such period by Sections 3 and 4.

         6.    RESERVATION OF STOCK ISSUABLE ON EXERCISE OF WARRANT. The Company
will at all times reserve and keep available, solely for issuance and delivery
on the exercise of the Warrant, all shares of Common Stock from time to time
issuable on the exercise of the Warrant; the shares of Common Stock which the
holder of this Warrant shall receive upon exercise of the Warrant will be duly
authorized, validly issued, fully paid and non-assessable.

         7.    EXCHANGE OF WARRANT. On surrender for exchange of this Warrant,
properly endorsed, to the Company, the Company at its expense will issue and
deliver to or on the order of the holder thereof a new Warrant or Warrants of
like tenor, in the name of such holder or as such holder (on payment by such
holder of any applicable transfer taxes) may direct, calling in the aggregate on
the face or faces thereof for the number of shares of Common Stock called for on
the face or faces of the Warrant or Warrants so surrendered.

         8.    REPLACEMENT OF WARRANT. On receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and, in the case of any such loss, theft or destruction of this
Warrant, on delivery of an indemnity agreement or security reasonably
satisfactory in form and amount to the Company or, in the case of any such
mutilation, on surrender and cancellation of such Warrant, the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

         9.    WARRANTHOLDER NOT DEEMED STOCKHOLDER; RESTRICTIONS ON TRANSFER.
This Warrant is issued upon the following terms, to all of which each holder or
owner hereof by the taking hereof consents and agrees:

               (a) No holder of this Warrant shall, as such, be deemed the
holder of Common Stock that may at any time be issuable upon exercise of this
Warrant for any purpose whatsoever, nor shall anything contained herein be
construed to confer upon such holder, as such, any of the rights of a
stockholder of the Company until such holder shall have delivered formal notice
to the Company of an intention to exercise this Warrant, tendered promptly the
consideration required for exercise (whether cash or securities), exercised the
Warrant, and been issued shares of Common Stock in accordance with the
provisions hereof.

               (b) Neither this Warrant nor any shares of Common Stock purchased
pursuant to this Warrant shall be registered under the Securities Act of 1933
(the "SECURITIES ACT") and applicable state securities laws. Therefore, the
Company may require, as a condition of allowing the transfer or exchange of this
Warrant or such shares, that the holder or transferee of this Warrant or such
shares, as the case may be, furnish to the Company an opinion of counsel
acceptable to the Company to the effect that such transfer or exchange may be
made without registration under the Securities Act and applicable state
securities laws. The certificates

                                       -5-
<PAGE>

evidencing the shares of Common Stock issued on the exercise of the Warrant
shall bear a legend to the effect that the shares evidenced by such certificates
have not been registered under the Securities Act and applicable state
securities laws.

               (c) This Warrant is not transferable or assignable to any party
without the prior written consent of the Company, and accompanied by an opinion
of counsel satisfactory to the Company that such transfer is permissible under
applicable law.

         10.   NOTICES. All notices and other communications from the Company to
the holder of this Warrant shall be mailed by (i) first class mail, postage
prepaid, (ii) electronic facsimile transmission, or (iii) express overnight
courier service, at such address as may have been furnished to the Company in
writing by such holder or, until any such holder furnishes to the Company an
address, then to, and at the address of, the last holder of this Warrant who has
so furnished an address to the Company.

         11.   MISCELLANEOUS. This Warrant and any term hereof may be changed,
waived, discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought. This Warrant and the shares of Common Stock underlying this Warrant
shall be construed and enforced in accordance with and governed by the laws of
the State of Delaware. The invalidity or unenforceability of any provision
hereof shall in no way affect the validity or enforceability of any other
provision.

         12.   EXPIRATION. The right to exercise this Warrant shall expire at
5:00 p.m., Eastern Standard Time, on December 29, 2000.

         IN WITNESS WHEREOF, DYNAGEN, INC. has caused this Warrant to be signed
by its Executive Vice President and its corporate seal to be hereunto affixed
and attested by its Secretary this ____ day of _________, 1998.

ATTEST                                      DYNAGEN, INC.

---------------------
                                            By:
                                               --------------------------
                                               Dhananjay Wadekar
                                               Executive Vice President

                                       -6-
<PAGE>

                                  SUBSCRIPTION

         The undersigned, _______________________________________, pursuant to
the provisions of the foregoing Warrant, hereby agrees to subscribe for the
purchase of ________ shares of the Common Stock of DYNAGEN, INC. covered by said
Warrant, and makes payment therefor in full at the price per share provided by
said Warrant.

Dated:___________________________    Signature:______________________________

Address:_________________________

                                       -7-
<PAGE>
                                   ASSIGNMENT

         FOR VALUE RECEIVED ___________________________ hereby sells, assigns
and transfers unto ______________________________ the foregoing Warrant and all
rights evidenced thereby, and does irrevocably constitute and appoint
_____________________, attorney, to transfer said Warrant on the books of
DYNAGEN, INC..

Dated:__________________________        Signature:__________________________

Address:________________________

                                       -8-
<PAGE>

                               PARTIAL ASSIGNMENT

FOR VALUE RECEIVED _________________________ hereby sells, assigns and transfers
unto ___________________________ the right to purchase _________ shares of the
Common Stock of DYNAGEN, INC. by the foregoing Warrant, and a proportionate part
of said Warrant and the rights evidenced hereby, and does irrevocably constitute
and appoint _________________________, attorney, to transfer that part of said
Warrant on the books of DYNAGEN, INC.

Dated:___________________________    Signature:______________________________

Address:_________________________

        _________________________

                                       -9-
<PAGE>

                              NET ISSUANCE ELECTION

         The undersigned, _______________________________, pursuant to the
provisions of the foregoing Warrant, hereby tenders the right to purchase _____
shares of the Common Stock of DYNAGEN, INC., and a proportionate part of said
Warrant and the rights evidenced thereby, in exchange for a number of shares of
said Common Stock to be computed in accordance with the provisions of Section
1.4 of said Warrant.

Dated:__________________________      Signature:___________________________

Address:________________________

        ________________________

                                      -10-

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