EXHIBIT 4.7
                                                                    -----------


                          REGISTRATION RIGHTS AGREEMENT

                  THIS REGISTRATION RIGHTS AGREEMENT, dated as of November 29,
2000 (this "Agreement"), is made by and between DYNAGEN, INC. a Delaware
corporation, with headquarters located at Suite 2700, 1000 Winter Street,
Waltham, MA 02451 (the "Company"), and the entity named on a signature page
hereto ( "Initial Investor").

                              W I T N E S S E T H:

                  WHEREAS, upon the terms and subject to the conditions of the
Securities Purchase Agreement, dated as of November 29, 2000, between the
Initial Investor and the Company (the "Securities Purchase Agreement;" terms not
otherwise defined herein shall have the meanings ascribed to them in the
Securities Purchase Agreement), the Company has agreed to issue and sell to the
Initial Investor shares of Series N Preferred Stock of the Company having the
aggregate stated value set forth on the signature page of the Securities
Purchase Agreement (the "Preferred Stock"); and

                  WHEREAS, the Preferred Stock (which term, for purposes of this
Agreement, shall include Periodic Amount Shares, as defined below) is
convertible into shares of Common Stock (the "Conversion Shares"); upon the
terms and subject to the conditions contained in the Certificate of
Designations; and

                  WHEREAS, to induce the Initial Investor to execute and deliver
the Securities Purchase Agreement, the Company has agreed to provide certain
registration rights under the Securities Act of 1933, as amended, and the rules
and regulations thereunder, or any similar successor statute (collectively, the
"Securities Act"), with respect to the Conversion Shares.

                  NOW, THEREFORE, in consideration of the premises and the
mutual covenants contained herein and other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the Company and the
Initial Investor hereby agree as follows:

                  1. DEFINITIONS. As used in this Agreement, the following terms
shall have the following meanings:

                  (a) "Investor" means the Initial Investor and any permitted
transferee or assignee who agrees to become bound by the provisions of this
Agreement in accordance with Section 9 hereof and who holds Preferred Stock, or
Registrable Securities.


                                        1

<PAGE>


                  (b) "Potential Material Event" means any of the following: (i)
the possession by the Company of material information not ripe for disclosure in
a registration statement, which shall be evidenced by determinations in good
faith by the Board of Directors of the Company that disclosure of such
information in the registration statement would be detrimental to the business
and affairs of the Company; or (ii) any material engagement or activity by the
Company which would, in the good faith determination of the Board of Directors
of the Company, be adversely affected by disclosure in a registration statement
at such time, which determination shall be accompanied by a good faith
determination by the Board of Directors of the Company that the registration
statement would be materially misleading absent the inclusion of such
information.

                  (c) "Register," "Registered," and "Registration" refer to a
registration effected by preparing and filing a Registration Statement or
Statements in compliance with the Securities Act and pursuant to Rule 415 under
the Securities Act or any successor rule providing for offering securities on a
continuous basis ("Rule 415"), and the declaration or ordering of effectiveness
of such Registration Statement by the United States Securities and Exchange
Commission (the "SEC").

                  (d) "Registrable Securities" means the Conversion Shares.

                  (e) "Registration Statement" means a registration statement of
the Company under the Securities Act covering Registrable Securities on Form
S-3, if the Company is then eligible to file using such form, and if not
eligible, on Form SB-2 or other appropriate form.

                  (f) "Required Effective Date" means the relevant Initial
Required Effective Date or Increased Required Effective Date (as those terms are
defined below).

                  2. REGISTRATION.

                  (A) MANDATORY REGISTRATION.

                  (i) The Company shall prepare and file with the SEC, as soon
as possible after the Closing Date but no later than sixty (60) days after the
Closing Date (the "Required Filing Date"), either a Registration Statement or an
amendment to an existing Registration Statement, in either event registering for
resale by the Investor (i) a sufficient number of shares of Common Stock for the
Initial Investors to sell the Registrable Securities, but in no event less than
the number of shares equal to the sum of one hundred and fifty percent (150%) of
the number of shares into which the Preferred Stock, through the third
anniversary of their issuance, would be convertible at the time of filing of
such Registration Statement (assuming for such purposes that all shares of
Preferred Stock had been eligible to be converted, and had been converted, into
Conversion Shares in accordance with their terms, whether or not such issuance,
eligibility or conversion had in fact occurred as of such date) and (ii) a
sufficient number of shares of Common Stock for the Initial Investors to sell
Registrable Securities issuable upon the occurrence of reasonably expected
penalties. The Registration Statement (W) shall include only the Registrable
Securities, unless the

                                        2

<PAGE>

Investor consents to the inclusion of other shares of the Company's capital
stock, and (X) shall also state that, in accordance with Rule 416 and 457 under
the Securities Act, it also covers such indeterminate number of additional
shares of Common Stock as may become issuable upon conversion of the Preferred
Stock to prevent dilution resulting from stock splits, or stock dividends. The
Company will use its reasonable best efforts to cause such Registration
Statement to be declared effective on a date (the "Initial Required Effective
Date") which is no later than the earlier of (Y) five (5) days after oral or
written notice by the SEC that it may be declared effective or (Z) one hundred
and twenty (120) days after the Closing Date.

                  (ii) If at any time (an "Increased Registered Shares Date"),
the number of shares of Common Stock represented by the Registrable Shares,
issued or to be issued as contemplated by the Transaction Agreements, exceeds
eighty percent (80%) of the aggregate number of shares of Common Stock then
registered, whether or not such Registration Statement is effective, then within
ten (10) days after the Increased Registered Shares Date, the Company shall
either (X) amend the relevant Registration Statement ("Increased Shares
Amendment") filed by the Company pursuant to the preceding provisions of this
Section 2, if such Registration Statement has not been declared effective by the
SEC at that time, (the "Required Increased Shares Amendment Filing Date") to
register, in the aggregate, at least the number of shares (the "Increased Shares
Amount") equal to (I) the number of shares theretofore issued on conversion of
the Preferred Stock plus (II) one hundred and fifty percent (150%) of the number
of shares into which the unconverted Preferred Stock, through the thirty-six
(36) month anniversary of the Closing Date, would be convertible at the date of
such filing (assuming for such purposes that all such shares of Preferred Stock
had been issued, had been eligible to be converted, and had been converted into
Conversion Shares in accordance with their terms, whether or not such issuance,
accrual of dividends, eligibility or conversion had in fact occurred as of such
date), or (Y) if such Registration Statement has been declared effective by the
SEC at that time, file with the SEC an additional Registration Statement (an
"Additional Registration Statement"), (the "Required Additional Registration
Filing Date") to register the number of shares equal to the excess of the
Increased Shares Amount over the aggregate number of shares of Common Stock
already registered. The Company will use its reasonable best efforts to cause
such Increased Shares Amendment or the Additional Registration Statement to be
declared effective on a date (each, an "Increased Required Effective Date")
which is no later than (Q) with respect to a Registration Statement under clause
(X) of this subparagraph (ii), the Initial Required Effective Date and (R) with
respect to an Additional Registration Statement, the earlier of (I) five (5)
days after notice by the SEC that it may be declared effective or (II) thirty
(30) days after the Required Additional Registration Filing Date.

                  (B) PAYMENTS BY THE COMPANY.

                  (i) If (a) the Registration Statement covering the Registrable
Securities is not filed by the Required Filing Date, (b) the Increased Shares
Amendment is not filed by the Required Increased Shares Amendment Filing Date,
(c) the Additional Registration Statement is not filed by the Required
Additional Registration Filing Date, (d) the Registration Statement is not
declared

                                        3

<PAGE>


effective by sixty (60) days after the Initial Required Effective Date, (e) the
Increased Shares Amendment and/or the Additional Registration Statement are not
declared effective by the Increased Required Effective Date, or (f) the Investor
is restricted from making sales of Registrable Securities covered by any
previously effective Registration Statement at any time (the date such
restriction commences, a "Restricted Sale Date") after the relevant Effective
Date other than during a Permitted Suspension Period (as defined below), or if
the Company's Common Stock is delisted (each a "Periodic Amount Default Date")
then the Company will make payments to the Initial Investor in such amounts and
at such times as shall be determined pursuant to this Section 2(b).

                  (ii) The amount (the "Periodic Amount") to be paid by the
Company to the Initial Investor shall be determined as of each Computation Date
(as defined below) and such amount shall be equal to the Periodic Amount
Percentage (as defined below) of the Purchase Price for all Preferred Stock, for
the period from any Periodic Amount Default Date each as set out in Section
2(b)(i) above as the case may be, to the first relevant Computation Date, and
thereafter to each subsequent Computation Date. The Periodic Amount shall be pro
rated for periods between Computation Dates of less than thirty (30) days. The
"Periodic Amount Percentage" means (A) two percent (2%) of the Purchase Price of
all Preferred Stock for each thirty (30) day period beginning on the date which
is 180 days after the Closing Date during which the Effective Statement is not
effective; and (B) two percent (2%) of the Purchase Price of all Preferred Stock
for each thirty (30) day period commencing on any of the Periodic Amount Default
Dates as the case may be, during which the relevant Registration Statement is
either not filed or not effective. Notwithstanding the provisions of the
previous sentence, the Periodic Amount Percentage for the first two Computation
Dates as regards the Initial Required Effective Date shall be 1.5%, and
thereafter 2%. Anything in the preceding provisions of this paragraph (ii) to
the contrary notwithstanding, after the Effective Date the Purchase Price for
such Preferred Stock shall be deemed to refer to the sum of (X) the principal
amount of all Preferred Stock not yet converted and (Y) the Held Shares Value
(as defined below). The "Held Shares Value" means, for shares acquired by the
Investor upon a conversion within the thirty (30) days preceding the Restricted
Sale Date, but not yet sold by the Investor, the principal amount of the
Preferred Stock converted into such Conversion Shares; provided, however, that
if the Investor effected more than one conversion during such thirty (30) day
period and sold less than all of such shares, the sold shares shall be deemed to
be derived first from the conversions in the sequence of such conversions (that
is, for example, until the number of shares from the first of such conversions
have been sold, all shares shall be deemed to be from the first conversion;
thereafter, from the second conversion until all such shares are sold).

                  (iii) Each Periodic Amount will be payable by the Company,
except as provided in the other provisions of this subparagraph (iii), in
additional shares of Series N Preferred Stock of the Company (which shares shall
have the rights of the Series N Preferred Stock contained in the Certificate of
Designations) having an aggregate stated value equal to 88% of the Periodic
Amount payable to the Investor ( the "Periodic Amount Shares") (1) within five
(5) business days after (a) the Required Filing Date, (b) the Required Increased
Shares Amendment Filing Date, (c) the Required Additional Registration Filing
Date, (d) the Initial Required Effective Date (e) the

                                        4

<PAGE>

Increased Required Effective Date, as the case may be, and (2) on the earlier of
(A) each thirtieth day thereafter, (B) the third business day after the date the
Registration Statement and/or the Required Increased Shares Amendment and/or the
Additional Registration Statement is filed, or is declared effective, or (C) the
third business day after the Registration Statement and/or the Required
Increased Shares Amendment and/or the Additional Registration Statement has its
restrictions removed after the Initial Required Effective Date and/or the
Increased Required Effective Date, as the case may be, in each case without
requiring demand therefor by the Investor.

                  (iv) The parties acknowledge that the damages which may be
incurred by the Investor if (a) the Registration Statement, the Required
Increased Shares Amendment, or the Additional Registration Statement is not
filed by the Required Filing Date, or (b) the Registration Statement has not
been declared effective by the Initial Required Effective Date or the Increased
Required Effective Date, including if the right to sell Registrable Securities
under a previously effective Registration Statement is suspended, may be
difficult to ascertain. The parties agree that the Periodic Amounts represent a
reasonable estimate on the part of the parties, as of the date of this
Agreement, of the amount of such damages.

                  (v) Notwithstanding the foregoing, the amounts payable by the
Company pursuant to this provision shall not be payable (a) to the extent any
delay in the effectiveness of the Registration Statement occurs because of an
act of, or a failure to act or to act timely by the Initial Investor or its
counsel, (b) in the event all of the Registrable Securities may be sold pursuant
to Rule 144 or another available exemption under the Act without volume or other
restrictions or limits or (c) with respect to a Permitted Suspension Period.

                  (vi) "Computation Date" means (A) the date which is the
earlier of (1) thirty (30) days after, (a) the Required Filing Date, (b) the
Required Increased Shares Amendment Filing Date , (c) the Required Additional
Registration Filing Date, (d) the Initial Required Effective Date, (e) the
Increased Required Effective Date and (f) a Restricted Sale Date, as the case
may be, or (2) the date after, (a) the Required Filing Date, (b) the Required
Increased Shares Amendment Filing Date, (c) the Required Additional Registration
Filing Date (d) the Initial Required Effective Date, (e) the Increased Required
Effective Date and (f) a Restricted Sale Date, on which the Registration
Statement, the Required Increased Shares Amendment, or the Additional
Registration Statement is filed (with respect to payments due as contemplated by
Section 2(b)(i) hereof) or is declared effective or has its restrictions removed
(with respect to payments due as contemplated by Section 2(b)(ii) hereof), as
the case may be, and (B) each date which is the earlier of (1) thirty (30) days
after the previous Computation Date or (2) the date after the previous
Computation Date on which, (a) the Registration Statement (b) the Required
Increased Shares Amendment or (c) the Additional Registration Statement is filed
(with respect to payments due as contemplated by Section 2(b)(i) hereof) or is
declared effective or has its restrictions removed (with respect to payments due
as contemplated by Section 2(b)(ii) hereof), as the case may be.

                                        5

<PAGE>

                  3. OBLIGATIONS OF THE COMPANY. In connection with the
registration of the Registrable Securities, the Company shall do each of the
following:

                  (a) Prepare and file with the SEC by the Required Filing Date
a Registration Statement with respect to not less than the number of Registrable
Securities provided in Section 2(a) above, and thereafter use commercially
reasonable efforts to cause such Registration Statement relating to Registrable
Securities to become effective by the Required Effective Date and keep the
Registration Statement effective at all times during the period (the
"Registration Period") continuing until the earliest of (i) the date that is
three (3) years after the last day of the calendar month following the month in
which the relevant Effective Date occurs, (ii) the date when the Investors may
sell all Registrable Securities under Rule 144(k), without volume or other
restrictions or limits, or (iii) the date the Investors no longer own any of the
Registrable Securities, which Registration Statement (including any amendments
or supplements thereto and prospectuses contained therein) shall not contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary to make the statements therein, in light of the
circumstances in which they were made, not misleading;

                  (b) Prepare and file with the SEC such amendments (including
post-effective amendments) and supplements to the Registration Statement and the
prospectus used in connection with the Registration Statement as may be
necessary to keep the Registration Statement effective at all times during the
Registration Period, and, during the Registration Period, comply with the
provisions of the Securities Act with respect to the disposition of all
Registrable Securities of the Company covered by the Registration Statement
until such time as all of such Registrable Securities have been disposed of in
accordance with the intended methods of disposition by the seller or sellers
thereof as set forth in the Registration Statement;

                  (c) Permit a single firm of counsel designated by the Initial
Investors to review the Registration Statement and all amendments and
supplements thereto a reasonable period of time (but not less than three (3)
business days) prior to their filing with the SEC, and not file the Registration
Statement or any amendment or supplement thereto in a form to which such counsel
reasonably objects;

                  (d) Notify each Investor and such Investor's legal counsel
identified to the Company and which has requested by written notice to the
Company that it receive such notification (which, until further notice, shall be
deemed to be Krieger & Prager LLP, Attn: Samuel Krieger, Esq., which firm has
requested to receive such notification; each, an "Investor's Counsel"), and any
managing underwriters immediately (and, in the case of (i)(A) below, not less
than three (3) business days prior to such filing) and (if requested by any such
person) confirm such notice in writing no later than one (1) business day
following the day (i)(A) when a prospectus or any prospectus supplement or post-
effective amendment to the Registration Statement is proposed to be filed; (B)
whenever the SEC notifies the Company whether there will be a "review" of such
Registration Statement; (C) whenever the Company receives (or a representative
of the Company receives on its behalf) any oral or written

                                        6

<PAGE>

comments from the SEC in respect of a Registration Statement (copies or, in the
case of oral comments, summaries of such comments shall be promptly furnished by
the Company to the Investors); and (D) with respect to the Registration
Statement or any post-effective amendment, when the same has become effective;
(ii) of any request by the SEC 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 SEC of
any stop order suspending the effectiveness of the Registration Statement
covering any or all of the Registrable Securities or the initiation of any
proceedings for that purpose; (iv) if at any time any of the representations or
warranties of the Company contained in any agreement (including any underwriting
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 that to the best knowledge of the Company makes any statement made in
the Registration Statement or prospectus or any document incorporated or deemed
to be incorporated therein by reference untrue in any material respect or that
requires any revisions to the Registration Statement, prospectus or other
documents so that, in the case of the Registration Statement or the prospectus,
as the case may be, it will not contain any untrue statement of a material fact
or omit to state any material fact required to be stated therein or necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading. In addition, the Company shall furnish the Investor's
Counsel with copies of all intended written responses to the comments
contemplated in clause (C) of this Section 3(d) not later than one (1) business
day in advance of the filing of such responses with the SEC so that the
Investors shall have the opportunity to comment thereon;

                  (e) Furnish to each Investor and such Investor's Counsel (i)
promptly after the same is prepared and publicly distributed, filed with the
SEC, or received by the Company, one (1) copy of the Registration Statement,
each preliminary prospectus and prospectus, and each amendment or supplement
thereto, and (ii) such number of copies of a prospectus, and all amendments and
supplements thereto and such other documents, as such Investor may reasonably
request in order to facilitate the disposition of the Registrable Securities
owned by such Investor;

                  (f) As promptly as practicable after becoming aware thereof,
notify each Investor of the happening of any event of which the Company has
knowledge, as a result of which the prospectus included in the Registration
Statement, as then in effect, includes an untrue statement of a material fact or
omits 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, and use its best efforts promptly to prepare a supplement
or amendment to the Registration Statement or other appropriate filing with the
SEC to correct such untrue statement or omission, and deliver a number of copies
of such supplement or amendment to each Investor as such Investor may reasonably
request;

                                        7

<PAGE>

                  (g) As promptly as practicable after becoming aware thereof,
notify each Investor who holds Registrable Securities being sold (or, in the
event of an underwritten offering, the managing underwriters) of the issuance by
the SEC of a Notice of Effectiveness or any notice of effectiveness or any stop
order or other suspension of the effectiveness of the Registration Statement at
the earliest possible time;

                  (h) Notwithstanding the foregoing, if at any time or from time
to time after the date of effectiveness of the Registration Statement, the
Company notifies the Investors in writing of the existence of a Potential
Material Event, the Investors shall not offer or sell any Registrable
Securities, or engage in any other transaction involving or relating to the
Registrable Securities, from the time of the giving of notice with respect to a
Potential Material Event until such Investor receives written notice from the
Company that such Potential Material Event either has been disclosed to the
public or no longer constitutes a Potential Material Event; provided, however,
that the Company may not so suspend the right to such holders of Registrable
Securities during the periods the Registration Statement is required to be in
effect other than during a Permitted Suspension Period (and the applicable
provisions of Section 2(b) shall apply with respect to any such suspension other
than during a Permitted Suspension Period) . The term "Permitted Suspension
Period" means up to two such suspension periods during any consecutive 12-month
period, each of which suspension period shall not either (i) be for more than
ten (10) days or (ii) begin less than ten (10) business days after the last day
of the preceding suspension (whether or not such last day was during or after a
Permitted Suspension Period); provided further that the Company shall, if lawful
to do so, provide the Investor with at least two (2) business days' notice of
the existence (but not the substance of) a Potential Material Event;

                  (i) Use its reasonable efforts to secure and maintain the
designation of all the Registrable Securities covered by the Registration
Statement on the "Nasdaq/Bulletin Board Market" of the National Association of
Securities Dealers Automated Quotations System ("NASDAQ") within the meaning of
Rule 11Aa2-1 of the SEC under the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and the quotation of the Registrable Securities on The
Nasdaq/Bulletin Board Market; and, without limiting the generality of the
foregoing, to use commercially reasonable efforts to arrange for at least two
market makers to register with the National Association of Securities Dealers,
Inc. as such with respect to such Registrable Securities;

                  (j) Provide a transfer agent and registrar, which may be a
single entity, for the Registrable Securities not later than the effective date
of the Registration Statement;

                  (k) Cooperate with the Investors who hold Registrable
Securities being offered to facilitate the timely preparation and delivery of
certificates for the Registrable Securities to be offered pursuant to the
Registration Statement and enable such certificates for the Registrable
Securities to be in such denominations or amounts as the case may be, as the
Investors may reasonably request, and, within five (5) business days after a
Registration Statement which includes Registrable Securities is ordered
effective by the SEC, the Company shall deliver, and shall cause

                                        8

<PAGE>

legal counsel selected by the Company to deliver, to the transfer agent for the
Registrable Securities (with copies to the Investors whose Registrable
Securities are included in such Registration Statement) an appropriate
instruction and opinion of such counsel; and

                  (l) Take all other reasonable actions necessary to expedite
and facilitate disposition by the Investor of the Registrable Securities
pursuant to the Registration Statement.

                  4. OBLIGATIONS OF THE INVESTORS. In connection with the
registration of the Registrable Securities, the Investors shall have the
following obligations:

                  (a) It shall be a condition precedent to the obligations of
the Company to complete the registration pursuant to this Agreement with respect
to the Registrable Securities of a particular Investor that such Investor shall
furnish to the Company such information regarding itself, the Registrable
Securities held by it, and the intended method of disposition of the Registrable
Securities held by it, as shall be reasonably required to effect the
registration of such Registrable Securities and shall execute such documents in
connection with such registration as the Company may reasonably request. At
least ten (10) days prior to the first anticipated filing date of the
Registration Statement, the Company shall notify each Investor of the
information the Company requires from each such Investor (the "Requested
Information") if such Investor has any Registrable Securities included in the
Registration Statement. If at least two (2) business days prior to the filing
date the Company has not received the Requested Information from an Investor (a
"Non-Responsive Investor"), then the Company may file the Registration Statement
without including Registrable Securities of such Non-Responsive Investor;

                  (b) Each Investor, by such Investor's acceptance of the
Registrable Securities, agrees to cooperate with the Company as reasonably
requested by the Company in connection with the preparation and filing of the
Registration Statement hereunder, unless such Investor has notified the Company
in writing of such Investor's election to exclude all of such Investor's
Registrable Securities from the Registration Statement; and

                  (c) Each Investor agrees that, upon receipt of any notice from
the Company of the happening of any event of the kind described in Section 3(f)
or 3(g), above, such Investor will immediately discontinue disposition of
Registrable Securities pursuant to the Registration Statement covering such
Registrable Securities until such Investor's receipt of the copies of the
supplemented or amended prospectus contemplated by Section 3(f) or 3(g) and, if
so directed by the Company, such Investor shall deliver to the Company (at the
expense of the Company) or destroy (and deliver to the Company a certificate of
destruction) all copies in such Investor's possession, of the prospectus
covering such Registrable Securities current at the time of receipt of such
notice.

                  5. EXPENSES OF REGISTRATION. All reasonable expenses (other
than underwriting discounts and commissions of the Investor) incurred in
connection with registrations, filings or qualifications pursuant to Section 3,
but including, without limitation, all registration, listing, and

                                        9

<PAGE>

qualifications fees, printers and accounting fees, the fees and disbursements of
counsel for the Company shall be borne by the Company. In addition, a fee for a
single counsel for the Investors (as a group and not individually) equal to
$2,000 for the review of each Registration Statement shall be borne by the
Company.

                  6. INDEMNIFICATION. In the event any Registrable Securities
are included in a Registration Statement under this Agreement:

                  (a) To the extent permitted by law, the Company will indemnify
and hold harmless each Investor who holds such Registrable Securities, the
directors, if any, of such Investor, the officers, if any, of such Investor,
each person, if any, who controls any Investor within the meaning of the
Securities Act or the Exchange Act (each, an "Indemnified Person" or
"Indemnified Party"), against any losses, claims, damages, liabilities or
expenses (joint or several) incurred (collectively, "Claims") to which any of
them may become subject under the Securities Act, the Exchange Act or otherwise,
insofar as such Claims (or actions or proceedings, whether commenced or
threatened, in respect thereof) arise out of or are based upon any of the
following statements, omissions or violations in the Registration Statement, or
any post-effective amendment thereof, or any prospectus included therein: (i)
any untrue statement or alleged untrue statement of a material fact contained in
the Registration Statement or any post-effective amendment thereof or the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, (ii)
any untrue statement or alleged untrue statement of a material fact contained in
the final prospectus (as amended or supplemented, if the Company files any
amendment thereof or supplement thereto with the SEC) or the omission or alleged
omission to state therein any material fact necessary to make the statements
made therein, in light of the circumstances under which the statements therein
were made, not misleading or (iii) any violation or alleged violation by the
Company of the Securities Act, the Exchange Act, any state securities law or any
rule or regulation under the Securities Act, the Exchange Act or any state
securities law (the matters in the foregoing clauses (i) through (iii) being,
collectively, "Violations"). Subject to clause (b) of this Section 6, the
Company shall reimburse the Investors, promptly as such expenses are incurred
and are due and payable, for any legal fees or other reasonable expenses
incurred by them in connection with investigating or defending any such Claim.
Notwithstanding anything to the contrary contained herein, the indemnification
agreement contained in this Section 6(a) shall not (I) apply to a Claim arising
out of or based upon a Violation which occurs in reliance upon and in conformity
with information furnished in writing to the Company by or on behalf of any
Indemnified Person expressly for use in connection with the preparation of the
Registration Statement or any such amendment thereof or supplement thereto; (II)
be available to the extent such Claim is based on a failure of the Investor to
deliver or cause to be delivered the prospectus made available by the Company or
the amendment or supplement thereto made available by the Company; (III) be
available to the extent such Claim is based on the delivery of a prospectus by
the Investor after receiving notice from the Company under Section 3(f), (g) or
(h) hereof (other than a notice regarding the effectiveness of the Registration
Statement or any amendment or supplement thereto), or (IV) apply to amounts paid
in settlement of any Claim if such settlement is effected without the prior
written

                                       10

<PAGE>

consent of the Company, which consent shall not be unreasonably withheld or
delayed. Each Investor will indemnify and hold harmless the Company and its
officers, directors and agents (each, an "Indemnified Person" or "Indemnified
Party") against any Claims arising out of or based upon any Violation which
occurs in reliance upon and in conformity with information furnished to the
Company, by or on behalf of such Investor, expressly for use in connection with
the preparation of the Registration Statement or the amendment or supplement
thereto, subject to such limitations and conditions as are applicable to the
Indemnification provided by the Company to this Section 6. Such indemnity shall
remain in full force and effect regardless of any investigation made by or on
behalf of the Indemnified Person and shall survive the transfer of the
Registrable Securities by the Investors pursuant to Section 9.

                  (b) Promptly after receipt by an Indemnified Person or
Indemnified Party under this Section 6 of notice of the commencement of any
action (including any governmental action), such Indemnified Person or
Indemnified Party shall, if a Claim in respect thereof is to be made against any
indemnifying party under this Section 6, deliver to the indemnifying party a
written notice of the commencement thereof and the indemnifying party shall have
the right to participate in, and, to the extent the indemnifying party so
desires, jointly with any other indemnifying party similarly noticed, to assume
control of the defense thereof with counsel mutually satisfactory to the
indemnifying party and the Indemnified Person or the Indemnified Party, as the
case may be. In case any such action is brought against any Indemnified Person
or Indemnified Party, and it notifies the indemnifying party of the commencement
thereof, the indemnifying party will be entitled to participate in, and, to the
extent that it may wish, jointly with any other indemnifying party similarly
notified, assume the defense thereof, subject to the provisions herein stated
and after notice from the indemnifying party to such Indemnified Person or
Indemnified Party of its election so to assume the defense thereof, the
indemnifying party will not be liable to such Indemnified Person or Indemnified
Party under this Section 6 for any legal or other reasonable out-of-pocket
expenses subsequently incurred by such Indemnified Person or Indemnified Party
in connection with the defense thereof other than reasonable costs of
investigation, unless the indemnifying party shall not pursue the action to its
final conclusion. The Indemnified Person or 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 reasonable out-of-pocket expenses of such
counsel shall not be at the expense of the indemnifying party if the
indemnifying party has assumed the defense of the action with counsel reasonably
satisfactory to the Indemnified Person or Indemnified Party provided such
counsel is of the opinion that all defenses available to the Indemnified Party
can be maintained without prejudicing the rights of the indemnifying party. The
failure to deliver written notice to the indemnifying party within a reasonable
time of the commencement of any such action shall not relieve such indemnifying
party of any liability to the Indemnified Person or Indemnified Party under this
Section 6, except to the extent that the indemnifying party is prejudiced in its
ability to defend such action. The indemnification required by this Section 6
shall be made by periodic payments of the amount thereof during the course of
the investigation or defense, as such expense, loss, damage or liability is
incurred and is due and payable.

                                       11

<PAGE>

                  7. CONTRIBUTION. To the extent any indemnification by an
indemnifying party is prohibited or limited by law, the indemnifying party
agrees to make the maximum contribution with respect to any amounts for which it
would otherwise be liable under Section 6 to the fullest extent permitted by
law; provided, however, that (a) no contribution shall be made under
circumstances where the maker would not have been liable for indemnification
under the fault standards set forth in Section 6; (b) no seller of Registrable
Securities guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Securities Act) shall be entitled to contribution from any seller
of Registrable Securities who was not guilty of such fraudulent
misrepresentation; and (c) except where the seller has committed fraud (other
than a fraud by reason of the information included or omitted from the
Registration Statement as to which the Company has not given notice as
contemplated under Section 3 hereof) or intentional misconduct, contribution by
any seller of Registrable Securities shall be limited in amount to the net
amount of proceeds received by such seller from the sale of such Registrable
Securities.

                  8. REPORTS UNDER SECURITIES ACT AND EXCHANGE ACT. With a view
to making available to Investor the benefits of Rule 144 promulgated under the
Securities Act or any other similar rule or regulation of the SEC that may at
any time permit Investor to sell securities of the Company to the public without
Registration ("Rule 144"), the Company agrees to:

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

                  (b) file with the SEC in a timely manner all reports and other
documents required of the Company under the Securities Act and the Exchange Act;
and

                  (c) furnish to Investor so long as Investor owns Registrable
Securities, promptly upon request, (i) a written statement by the Company that
it has complied with the reporting requirements of the Securities Act and the
Exchange Act, (ii) a copy of the most recent annual or quarterly report of the
Company and such other reports and documents so filed by the Company and (iii)
such other information as may be reasonably requested to permit Investor to sell
such securities pursuant to Rule 144 without Registration.

                  (d) The Company will, at the request of any Holder of
Registrable Securities, upon receipt from such Holder of a certificate
certifying (i) that such Holder has held such Registrable Securities for a
period of not less than one (1) year, (ii) that such Holder has not been an
affiliate (as defined in Rule 144) of the company for more than the ninety (90)
preceding days, and (iii) as to such other matters as may be appropriate in
accordance with such Rule, remove from the stock certificate representing such
Registrable Securities that portion of any restrictive legend which relates to
the registration provisions of the Securities Act, provided, however, counsel to
Investor is hereby authorized to provide such instructions and opinion to the
transfer agent regarding the removal of the restrictive legend.

                                       12

<PAGE>

                  9. ASSIGNMENT OF THE REGISTRATION RIGHTS. The rights to have
the Company register Registrable Securities pursuant to this Agreement shall be
automatically assigned by the Investors to any transferee of Registrable
Securities (or all or any portion of any unconverted Preferred Stock) only if:
(a) the Investor agrees in writing with the transferee or assignee to assign
such rights, and a copy of such agreement is furnished to the Company within a
reasonable time after such assignment, (b) the Company is, within a reasonable
time after such transfer or assignment, furnished with written notice of (i) the
name and address of such transferee or assignee and (ii) the securities with
respect to which such registration rights are being transferred or assigned, (c)
immediately following such transfer or assignment the further disposition of
such securities by the transferee or assignee is restricted under the Securities
Act and applicable state securities laws, and (d) at or before the time the
Company received the written notice contemplated by clause (b) of this sentence
the transferee or assignee agrees in writing with the Company to be bound by all
of the provisions contained herein.

                  10. AMENDMENT OF REGISTRATION RIGHTS. Any provision of this
Agreement may be amended and the observance thereof may be waived (either
generally or in a particular instance and either retroactively or
prospectively), only with the written consent of the Company and Investors who
hold a eighty (80%) percent interest of the Registrable Securities. Any
amendment or waiver effected in accordance with this Section 10 shall be binding
upon each Investor and the Company.

                  11.      MISCELLANEOUS.

                                    (a) A person or entity is deemed to be a
holder of Registrable Securities whenever such person or entity owns of record
such Registrable Securities. The Company shall act upon the basis of
instructions, notice or election received from the registered owner of such
Registrable Securities.

                                    (b) Notices required or permitted to be
given hereunder shall be given in the manner contemplated by the Securities
Purchase Agreement, (i) if to the Company or to the Initial Investor, to their
respective address contemplated by the Securities Purchase Agreement, and (ii)
if to any other Investor, at such address as such Investor shall have provided
in writing to the Company, or at such other address as each such party furnishes
by notice given in accordance with this Section 11(b).

                                    (c) Failure of any party to exercise any
right or remedy under this Agreement or otherwise, or delay by a party in
exercising such right or remedy, shall not operate as a waiver thereof.

                                    (d) This Agreement shall be governed by and
interpreted in accordance with the laws of the State of New York for contracts
to be wholly performed in such state and without giving effect to the principles
thereof regarding the conflict of laws. Each of the parties

                                       13

<PAGE>

consents to the jurisdiction of the federal courts whose districts encompass any
part of the City of New York or the state courts of the State of New York
sitting in the City of New York in connection with any dispute arising under
this Agreement and hereby waives, to the maximum extent permitted by law, any
objection, including any objection based on FORUM NON COVENIENS, to the bringing
of any such proceeding in such jurisdictions. To the extent determined by such
court, either party hereto shall reimburse the other party for any reasonable
legal fees and disbursements incurred by such party in enforcement of or
protection of any of its rights under this Agreement.

                                    (e) If any provision of this Agreement shall
be invalid or unenforceable in any jurisdiction, such invalidity or
unenforceability shall not affect the validity or enforceability of the
remainder of this Agreement or the validity or enforceability of this Agreement
in any other jurisdiction.

                                    (f) Subject to the requirements of Section 9
hereof, this Agreement shall inure to the benefit of and be binding upon the
successors and assigns of each of the parties hereto.

                                    (g) All pronouns and any variations thereof
refer to the masculine, feminine or neuter, singular or plural, as the context
may require.

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

                                    (i) This Agreement may be executed in one or
more counterparts, each of which shall be deemed an original but all of which
shall constitute one and the same agreement. This Agreement, once executed by a
party, may be delivered to the other party hereto by telephone line facsimile
transmission of a copy of this Agreement bearing the signature of the party so
delivering this Agreement.

                                    (j) This Agreement constitutes the entire
agreement among the parties hereto with respect to the subject matter hereof.
There are no restrictions, promises, warranties or undertakings, other than
those set forth or referred to herein. This Agreement supersedes all prior
agreements and understandings among the parties hereto with respect to the
subject matter hereof. This Agreement may be amended only by an instrument in
writing signed by the party to be charged with enforcement thereof.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



                                       14

<PAGE>


                        IN WITNESS WHEREOF, the parties have caused this
Agreement to be duly executed by their respective officers thereunto duly
authorized as of the day and year first above written.

                                  DYNAGEN, INC.

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


                                  THE ENDEAVOUR CAPITAL INVESTMENT FUND, S.A.

                                  By: Endeavour Management, Inc.

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



                                       15