THERMOGENESIS CORP
8-K, 2000-01-05
LABORATORY APPARATUS & FURNITURE
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    Form 8-K

                Current Report Pursuant to Section 13 or 15(d) of
                       The Securities Exchange Act of 1934

       Date of Report (Date of earliest event reported) December 23, 1999

                               THERMOGENESIS CORP.
             (Exact name of registrant as specified in its charter)

            Delaware                     0-16375                   94-3018487
- -------------------------------   ---------------------     --------------------
(State or other jurisdiction of   (Commission File No.)       (I.R.S. Employer
incorporation or organization)                               Identification No.)


                              3146 Gold Camp Drive
                        Rancho Cordova, California 95670
                                 (916) 858-5100
           ------------------------------------------------------------
          (Address and telephone number of principal executive offices)

Item 5.  Other Events

On January 4, 2000, THERMOGENESIS CORP. completed an offering of 4,040 shares of
Series B Convertible  Preferred Stock and warrants to purchase 444,562 shares of
THERMOGENESIS  CORP.  common stock.  The initial  placement was made to the lead
investors, Advantage Fund II Ltd. and Koch Investment Group Limited, on December
22, 1999, and the final closing was held on January 4, 2000 with Clarion Capital
Corporation.  The placement resulted in gross proceeds to THERMOGENESIS CORP. of
$4,040,000,  before  commissions  and expenses  payable in  connection  with the
placement.

Unless  stockholder  approval is obtained,  the Series B  Convertible  Preferred
Stock is convertible into a maximum of 4,236,000  shares of THERMOGENESIS  CORP.
common stock, in the aggregate. For the first six months from December 22, 1999,
the Series B Convertible  Preferred  Stock is convertible at a fixed  conversion
price of $2.2719 per common share, which represents the average bid price of the
common  stock for the ten days  prior to  December  22,  1999.  Thereafter,  the
conversion  price is  adjusted  every six months to be the lesser of (a) 130% of
the fixed  conversion  price or (b) 90% of the average  market price for the ten
days prior to such adjustment date. The Series B Convertible  Preferred Stock is
entitled to dividends at the rate of 6% per annum which amount, at the option of
THERMOGENESIS  CORP.,  may be added to the $1,000 per share  conversion value of
the Series B Convertible Preferred Stock.

The   conversion   price  is  subject  to  further   adjustment   under  certain
circumstances, provided such circumstances are outside of the Company's control,
as set  forth  in the  Certificate  of  Designations  of  Series  B  Convertible
Preferred Stock attached to this current report, including the following events:
(i) no closing bid price for the common stock for five consecutive trading days;
(ii) delisting of the common stock from the Nasdaq  SmallCap Market or any other
market or exchange;  (iii)  inability of the  investors to sell shares of common
stock  pursuant to an effective  registration  statement for 30 days or more, in
the aggregate; (iv)


<PAGE>2



certain business  combination events where THERMOGENESIS  CORP.  stockholders do
not  control  51%  of  the  combined  company,  unless  certain  conditions  are
satisfied; and (v) certain defaults by THERMOGENESIS CORP. in the performance of
its obligations to the  institutions;  and (iv) the adoption of any amendment to
THERMOGENESIS  CORP.'s  Certificate of Incorporation  materially  adverse to the
holders of the Series B Convertible  Preferred  Stock without the consent of the
majority of the shares of Series B Convertible Preferred Stock. If THERMOGENESIS
CORP. takes action to affect any of the foregoing,  and such action is deemed to
be within its control, the Series B holders can require that THERMOGENESIS CORP.
redeem the shares at a premium.

THERMOGENESIS  CORP. has the right to redeem the Series B Convertible  Preferred
Stock at a premium  and under  some  circumstances  at the  market  price of its
common stock that the Series B Convertible  Preferred  Stock would  otherwise be
convertible into.

The net proceeds from the offering will be used for general  corporate  purposes
and working capital.

The terms of the  private  placement  are set forth in the form of  Subscription
Agreement  attached as Exhibit 10 to this current  report.  The  Certificate  of
Designations of Series B Convertible Preferred Stock is also attached as Exhibit
4.1 to this current report, and contains the rights, preferences, privileges and
restrictions of the Series B Convertible Preferred Stock. The Warrants issued in
connection  with the placement are subject to the terms contained in the Form of
Warrant  attached as Exhibit 4.2 to this current report.  Under the Registration
Rights  Agreement,  entered  into with each  Series B investor  and  attached as
Exhibit  4.3,  THERMOGENESIS  CORP.  has  agreed  to  prepare  and file with the
Securities and Exchange Commission a registration  statement covering the resale
of the shares of common  stock  underlying  the Series B  Convertible  Preferred
Stock and warrants.

In connection with the placement of  THERMOGENESIS  CORP.'s Series B Convertible
Preferred Stock,  THERMOGENESIS  CORP. paid a 6% commission and issued a warrant
to purchase  40,000  shares of common  stock to  Reedland  Capital  Partners,  a
Division of Financial West Group. The warrants issued to Advantage Fund II Ltd.,
Koch Investment  Group Limited,  Clarion Capital  Corporation,  and Reedland are
exercisable for a period of five years at an exercise price of $2.72628.

Item 7. Financial Statements, Pro Forma Financial Information, and Exhibits

        (c)     EXHIBITS

Exhibit
Number                 Description
- -------                ------------
 4.1                   Certificate of Designations of Series B Convertible
                       Preferred Stock, dated December 22, 1999
 4.2                   Warrant [Form]
 4.3                   Registration Rights Agreement, dated December 22, 1999
                       [Form]
 10.                   Subscription Agreement, dated December 22, 1999 [Form]


<PAGE>3


                                           SIGNATURE


     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


Dated: January 4, 2000                       THERMOGENESIS CORP.
                                             a Delaware Corporation


                                       /s/   PHILIP H. COELHO
                                             --------------------------------
                                             Philip H. Coelho, Chairman & CEO



                               THERMOGENESIS CORP.

                         CERTIFICATE OF DESIGNATIONS OF
                      SERIES B CONVERTIBLE PREFERRED STOCK

               (Pursuant to Section 151 of the General Corporation
                          Law of the State of Delaware)

     ThermoGenesis  Corp.,  a  Delaware  corporation  (the  "Corporation"),   in
accordance with the provisions of Section 103 of the General  Corporation Law of
the State of Delaware, DOES HEREBY CERTIFY:

     That  pursuant  to  authority  vested  in the  Board  of  Directors  of the
Corporation  by the Amended and Restated  Certificate  of  Incorporation  of the
Corporation, the Board of Directors of the Corporation, at a meeting duly called
and held on December 10, 1999,  adopted a resolution  providing for the creation
of a series of the Corporation's  Preferred Stock, $.001 par value, which series
is designated as "Series B Convertible  Preferred Stock," which resolution is as
follows:

     RESOLVED,  that  pursuant to authority  vested in the Board of Directors by
the Amended and Restated  Certificate of Incorporation  of the Corporation,  the
Board of  Directors  does  hereby  provide  for the  creation of a series of the
Preferred Stock, $.001 par value (hereinafter  called the "Preferred Stock"), of
the Corporation,  and to the extent that the voting powers and the designations,
preferences  and  relative,  participating,  optional  or other  special  rights
thereof and the qualifications,  limitations or restrictions of such rights have
not been set forth in the Amended and Restated  Certificate of  Incorporation of
the Corporation, does hereby fix the same as follows:

                      SERIES B CONVERTIBLE PREFERRED STOCK

     Section 1. Definitions.  As used herein, the following terms shall have the
following meanings:

     "Accrual  Amount"  means with respect to any share of Series B  Convertible
Preferred  Stock on any date the amount of all  accrued  but  unpaid  dividends,
including  the amount of dividends  not required to be paid in cash  pursuant to
Section 5(b), on such share from the Issuance Date to the date of determination.

     "Affiliate"  means,  with  respect to any  person,  any other  person  that
directly,  or  indirectly  through  one or  more  intermediaries,  controls,  is
controlled by or is under common control with the subject  person;  for purposes
of this definition,  "control" (including,  with correlative meanings, the terms
"controlled  by" and "under common control  with"),  as used with respect to any
person,  shall mean the  possession,  directly  or  indirectly,  of the power to
direct or cause the  direction  of the  management  and policies of such person,
whether through the ownership of voting securities or by contract or otherwise.

<PAGE>

     "Aggregated  Person"  means,  with respect to any person,  any person whose
beneficial  ownership  of shares of Common  Stock would be  aggregated  with the
beneficial  ownership  of shares of Common  Stock by such person for purposes of
Section 13(d) of the Exchange Act, and Regulation 13D-G thereunder.

     "AMEX" means the American Stock Exchange, Inc.

     "Average  Market  Price" for any date means the  arithmetic  average of the
Market  Price for each of the  Trading  Days during the  applicable  Measurement
Period.

     "Biannual  Reset Date" means the date occurring  every six months after the
Initial Reset Date on the same day of each sixth month as the Initial Reset Date
through the third anniversary of the Issuance Date (for example,  if the Initial
Reset Date is June 9, 2000,  Biannual Reset Dates shall occur on each December 9
and June 9 thereafter through December 9, 2002).

     "Board  of  Directors"  or  "Board"  means the  Board of  Directors  of the
Corporation.

     "Business Day" means any day other than a Saturday,  Sunday or other day on
which commercial banks in The City of New York are authorized or required by law
to remain closed.

     "Common Stock" means the Common Stock, $.001 par value, of the Corporation.

     "Control  Notice" means a notice given by the Corporation to the holders of
shares of the Series B Convertible  Preferred  Stock, in accordance with Section
7(a)(5) or Section  11(b)(4),  (i) stating  that an  Inconvertibility  Day or an
Optional  Redemption Event, as the case may be, has occurred by reason of events
which are not solely within the control of the Corporation and (ii) enclosing an
executed Control Opinion.

     "Control  Opinion" means a legal opinion of Bartel Eng Linn & Schroder,  or
such other  independent  legal  counsel  selected by the Company and  reasonably
acceptable to the Majority  Holders (notice of which acceptance or nonacceptance
is given by the  Majority  Holders to the Company  within two  Business  Days of
being  advised of the name of such other  counsel),  addressed to the holders of
Series B Convertible  Preferred Stock stating that an Inconvertibility Day or an
Optional Redemption Event, as the case may be, which is the subject of a Control
Notice has occurred by reason of events which are not solely  within the control
of the Corporation.

     "Conversion Agent" means American Securities Transfer & Trust, Inc., or its
duly  appointed  successor,  as  conversion  agent for the Series B  Convertible
Preferred Stock pursuant to the Transfer Agent Agreement.

     "Conversion  Amount"  initially  shall be equal to  $1,000.00,  subject  to
adjustment as herein provided.

     "Conversion  Date"  means,  with  respect to each  conversion  of shares of
Series B Convertible  Preferred  Stock pursuant to Section 10, the date on which
the Conversion  Notice relating to such  conversion is actually  received by the
Conversion Agent,  whether by mail,  courier,  personal service,  telephone line
facsimile transmission or other means.

<PAGE>


     "Conversion  Notice" means a written notice, duly signed by or on behalf of
a holder of shares of Series B Convertible  Preferred Stock,  stating the number
of shares of Series B  Convertible  Preferred  Stock to be converted in the form
specified in the Subscription Agreements.

     "Conversion Price" means:

     (1) for any  Conversion  Date  during the  period  from the  Issuance  Date
through  the  day  immediately  prior  to the  Initial  Reset  Date,  the  Fixed
Conversion Price;

     (2) for any  Conversion  Date  during the Reset  Period  commencing  on the
Initial Reset Date, the lesser of:

          (a)  130% of the Fixed Conversion Price; and

          (b)  90% of the Average Market Price during the Measurement Period for
               the Initial Reset Date; and

     (3) for any  Conversion  Date during each Reset Period  commencing  on each
successive Biannual Reset Date, the lesser of:

          (a)  130% of the Fixed Conversion Price; and

          (b)  90% of the Average Market Price during the Measurement Period for
               such Biannual Reset Date;

provided,  however,  that  the  Conversion  Price  applicable  to  a  particular
conversion shall be subject to reduction as provided in Section 10(b)(6).

     "Conversion Rate" shall have the meaning provided in Section 10(a).

     "Converted  Market  Price"  means,  for any share of  Series B  Convertible
Preferred Stock as of any date of determination,  an amount equal to the product
obtained by multiplying (x) the number of shares of Common Stock which would, at
the time of such  determination,  be issuable on conversion  in accordance  with
Section  10(a)  of one  share  of  Series  B  Convertible  Preferred  Stock if a
Conversion Notice were given by the holder of such share of Series B Convertible
Preferred Stock on the date of such determination  (determined without regard to
any limitation on conversion based on beneficial  ownership contained in Section
10(a))  times (y) the  Average  Market  Price of the  Common  Stock  during  the
Measurement Period for the date of such determination.

     "Corporation  Optional  Redemption  Notice"  means a  notice  given  by the
Corporation  to the holders of shares of Series B  Convertible  Preferred  Stock
pursuant to Section 9(a) which notice  shall state (1) that the  Corporation  is
exercising  its right to redeem  all or a portion of the  outstanding  shares of
Series B Convertible Preferred Stock pursuant to Section 9(a), (2) the number of
shares of Series B Convertible  Preferred Stock held by such holder which are to
be  redeemed,  (3) the  Redemption  Price  per  share of  Series  B  Convertible
Preferred  Stock  to be  redeemed  or the  formula  for  determining  the  same,
determined in accordance herewith, and (4) the applicable Redemption Date.

<PAGE>


     "Current  Price" means with respect to any date the  arithmetic  average of
the  Market  Price  of the  Common  Stock  on the 30  consecutive  Trading  Days
commencing 45 Trading Days before such date.

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

     "Final  Redemption Date" means the date of redemption of shares of Series B
Convertible  Preferred Stock pursuant to Section 9(b),  determined in accordance
therewith.

     "Final  Redemption  Notice" means a notice given by the Corporation to each
holder of Series B Convertible  Preferred Stock pursuant to Section 9(b),  which
notice shall state (1) that the  Corporation  is exercising  its right to redeem
all  outstanding  shares of Series B  Convertible  Preferred  Stock  pursuant to
Section 9(b), (2) the number of shares of Series B Convertible  Preferred  Stock
held by such holder which are to be redeemed, (3) the Final Redemption Price per
share of Series B Convertible  Preferred  Stock held by such holder which are to
be redeemed,  determined in accordance  herewith,  and (4) the Final  Redemption
Date.

     "Final  Redemption  Price"  means,  for any share of  Series B  Convertible
Preferred  Stock on any date, an amount equal to the sum of (i) $1,000 plus (ii)
an amount  equal to the  Accrual  Amount  on the  share of Series B  Convertible
Preferred  Stock to be  redeemed  to the Final  Redemption  Date,  plus (iii) an
amount equal to the accrued and unpaid  interest on cash dividends in arrears on
such share of Series B Convertible  Preferred Stock to the Final Redemption Date
(determined as provided in Section 5).

     "Fixed  Conversion  Price" means $2.2719 (subject to equitable  adjustments
from time to time on terms  reasonably  acceptable  to the Majority  Holders for
stock    splits,    stock    dividends,     combinations,     recapitalizations,
reclassifications  and similar  events  occurring or with respect to which "ex-"
trading  commences  on or  after  the  date of  filing  of this  Certificate  of
Designations with the Secretary of State of the State of Delaware).

     "Generally  Accepted  Accounting  Principles"  for  any  person  means  the
generally  accepted  accounting  principles and practices applied by such person
from time to time in the preparation of its audited financial statements.

     "Inconvertibility Day" means any Trading Day on which the Corporation would
not have been required to convert in accordance with Section 10(a) any shares of
Series B Convertible  Preferred  Stock as a consequence of the  limitations  set
forth in Section  7(a)(1)  had all  outstanding  shares of Series B  Convertible
Preferred  Stock held by such  holder on such  Trading Day been  converted  into
Common Stock on such Trading Day (without regard to the  limitation,  if any, on
beneficial ownership by such holder contained in Section 10(a)).

     "Inconvertibility  Notice"  shall  have the  meaning  provided  in  Section
7(a)(2).

     "Initial Reset Date" means June 22, 2000.

     "Issuance Date" means the first date of original  issuance of any shares of
Series B Convertible Preferred Stock.

<PAGE>

     "Junior Dividend Stock" means, collectively, the Common Stock and any other
class or  series  of  capital  stock of the  Corporation  ranking  junior  as to
dividends to the Series B Convertible Preferred Stock.

     "Junior  Liquidation  Stock"  means the Common  Stock or any other class or
series of the  Corporation's  capital  stock  ranking  junior as to  liquidation
rights to the Series B Convertible Preferred Stock.

     "Junior Stock" shall have the meaning provided in Section 10(b)(8).

     "Liquidation  Preference"  means,  for each  share of Series B  Convertible
Preferred Stock, the sum of (i) an amount equal to the Accrual Amount thereon to
the date of final  distribution to the holders of shares of Series B Convertible
Preferred Stock in connection with the liquidation, dissolution or winding up of
the  Corporation  plus (ii)  accrued and unpaid  interest on cash  dividends  in
arrears  (computed  in  accordance  with  Section  5(a))  to the  date  of  such
distribution plus (iii) $1,000.00.

     "Majority  Holders"  means at any time the  holders  of  shares of Series B
Convertible   Preferred  Stock  which  shares   constitute  a  majority  of  the
outstanding shares of Series B Convertible Preferred Stock.

     "Market  Price" of the Common Stock on any date means the closing bid price
for one share of Common  Stock on such  date on the first  applicable  among the
following:  (a) the national  securities  exchange on which the shares of Common
Stock are listed  which  constitutes  the  principal  securities  market for the
Common Stock, (b) the Nasdaq, if the Nasdaq constitutes the principal market for
the  Common  Stock on such  date,  or (c) the  Nasdaq  SmallCap,  if the  Nasdaq
SmallCap  constitutes  the principal  securities  market for the Common Stock on
such date, in any such case as reported by Bloomberg,  L.P.; provided,  however,
that if during any  Measurement  Period or other period  during which the Market
Price is being determined:

          (i)  The  Corporation  shall  declare  or  pay a  dividend  or  make a
     distribution  to all holders of the  outstanding  Common Stock in shares of
     Common  Stock or fix any record date for any such  action,  then the Market
     Price for each day in such  Measurement  Period or such other  period which
     day is prior to the earlier of (1) the date fixed for the  determination of
     stockholders  entitled to receive such dividend or other  distribution  and
     (2) the date on which ex-dividend  trading in the Common Stock with respect
     to such dividend or distribution begins shall be reduced by multiplying the
     Market Price (determined  without regard to this proviso) for each such day
     in such  Measurement  Period  or  such  other  period  by a  fraction,  the
     numerator  of  which  shall  be  the  number  of  shares  of  Common  Stock
     outstanding  at the close of business on the earlier of (1) the record date
     fixed for such determination and (2) the date on which ex-dividend  trading
     in the Common Stock with respect to such  dividend or  distribution  begins
     and the  denominator of which shall be the sum of such number of shares and
     the  total   number  of  shares   constituting   such   dividend  or  other
     distribution;

          (ii) The Corporation  shall issue rights or warrants to all holders of
     its  outstanding  shares of  Common  Stock,  or fix a record  date for such
     issuance,  which  rights or warrants  entitle  such  holders  (for a period
     expiring  within  forty-five  (45)  days  after  the  date  fixed  for  the
     determination of stockholders  entitled to receive such rights or warrants)
     to  subscribe  for or purchase  shares of Common Stock at a price per share
     less than the Market Price (determined  without regard to this proviso) for

<PAGE>

     any day in such Measurement  Period or such other period which day is prior
     to the end of such 45-day  period,  then the Market Price for each such day
     shall be  reduced  so that the same  shall  equal the price  determined  by
     multiplying the Market Price (determined without regard to this proviso) by
     a fraction,  the numerator of which shall be the number of shares of Common
     Stock outstanding at the close of business on the record date fixed for the
     determination  of stockholders  entitled to receive such rights or warrants
     plus the number of shares which the aggregate  offering  price of the total
     number of shares so offered would  purchase at such Market  Price,  and the
     denominator  of  which  shall be the  number  of  shares  of  Common  Stock
     outstanding  on the close of  business  on such  record date plus the total
     number of additional  shares of Common Stock so offered for subscription or
     purchase. In determining whether any rights or warrants entitle the holders
     to subscribe for or purchase shares of Common Stock at less than the Market
     Price (determined  without regard to this proviso),  and in determining the
     aggregate  offering  price of such shares of Common  Stock,  there shall be
     taken into account any consideration  received for such rights or warrants,
     the value of such  consideration,  if other than cash,  to be determined in
     good faith by a resolution of the Board of Directors of the Corporation;

          (iii) The outstanding  shares of Common Stock shall be subdivided into
     a greater  number of shares of Common  Stock or a record  date for any such
     subdivision  shall be fixed,  then the Market Price of the Common Stock for
     each day in such Measurement Period or such other period which day is prior
     to the earlier of (1) the day upon which such subdivision becomes effective
     and (2) the date on which  ex-dividend  trading  in the  Common  Stock with
     respect to such subdivision  begins shall be proportionately  reduced,  and
     conversely,  in case  the  outstanding  shares  of  Common  Stock  shall be
     combined into a smaller number of shares of Common Stock,  the Market Price
     for each day in such  Measurement  Period or such other period which day is
     prior to the  earlier  of (1) the date on which  such  combination  becomes
     effective  and (2) the date on which trading in the Common Stock on a basis
     which gives effect to such  combination  begins,  shall be  proportionately
     increased;

          (iv) The Corporation  shall,  by dividend or otherwise,  distribute to
     all holders of its Common Stock shares of any class of capital stock of the
     Corporation  (other than any dividends or distributions to which clause (i)
     of this proviso  applies) or evidences of its  indebtedness,  cash or other
     assets (including securities, but excluding any rights or warrants referred
     to in  clause  (ii) of  this  proviso,  dividends  and  distributions  paid
     exclusively in cash, and any capital stock, evidences of indebtedness, cash
     or  assets  distributed  upon a merger  or  consolidation)  (the  foregoing
     hereinafter in this clause (iv) of this proviso  called the  "Securities"),
     or fix a record date for any such  distribution,  then,  in each such case,
     the  Market  Price for each day in such  Measurement  Period or such  other
     period  which day is prior to the  earlier of (1) the record  date for such
     distribution  and (2) the date on which  ex-dividend  trading in the Common
     Stock with respect to such distribution begins shall be reduced so that the
     same shall be equal to the price determined by multiplying the Market Price
     (determined without regard to this proviso) by a fraction, the numerator of
     which shall be the Market Price (determined without regard to this proviso)

<PAGE>

     for such date less the fair market  value (as  determined  in good faith by
     resolution  of the Board of Directors of the  Corporation)  on such date of
     the  portion  of  the  Securities  so  distributed  or  to  be  distributed
     applicable to one share of Common Stock and the  denominator of which shall
     be the Market Price  (determined  without  regard to this proviso) for such
     date; provided,  however,  that in the event the then fair market value (as
     so determined)  of the portion of the Securities so distributed  applicable
     to one share of Common  Stock is equal to or greater  than the Market Price
     (determined  without  regard to this clause (iv) of this  proviso)  for any
     such Trading Day, in lieu of the foregoing  adjustment,  adequate provision
     shall  be made so that the  holders  of  shares  of  Series  B  Convertible
     Preferred  Stock  shall have the right to receive  upon  conversion  of the
     shares of Series B Convertible Preferred Stock the amount of Securities the
     holders  of shares of  Series B  Convertible  Preferred  Stock  would  have
     received  had the number of shares of Common  Stock to be issued in payment
     of such  dividends on the shares of Series B  Convertible  Preferred  Stock
     been issued, or had the holders of shares of Series B Convertible Preferred
     Stock  converted the shares of Series B  Convertible  Preferred  Stock,  in
     either   such  case   immediately   prior  to  the  record  date  for  such
     distribution.  If the Board of Directors of the Corporation  determines the
     fair market value of any  distribution  for purposes of this clause (iv) by
     reference to the actual or when issued  trading  market for any  securities
     comprising all or part of such  distribution,  it must in doing so consider
     the prices in such  market on the same day for which an  adjustment  in the
     Market Price is being determined.

          For  purposes  of this  clause  (iv) and  clauses (i) and (ii) of this
     proviso,  any  dividend  or  distribution  to  which  this  clause  (iv) is
     applicable that also includes shares of Common Stock, or rights or warrants
     to subscribe for or purchase  shares of Common Stock to which clause (i) or
     (ii) of this proviso applies (or both), shall be deemed instead to be (1) a
     dividend or distribution of the evidences of indebtedness,  assets,  shares
     of capital stock, rights or warrants other than such shares of Common Stock
     or rights or warrants to which clause (i) or (ii) of this  proviso  applies
     (and any Market Price  reduction  required by this clause (iv) with respect
     to such dividend or distribution  shall then be made) immediately  followed
     by (2) a dividend or  distribution  of such shares of Common  Stock or such
     rights or warrants  (and any further  Market  Price  reduction  required by
     clauses  (i) and (ii) of this  proviso  with  respect to such  dividend  or
     distribution  shall then be made),  except that any shares of Common  Stock
     included in such dividend or distribution shall not be deemed  "outstanding
     at the close of business on the date fixed for such  determination"  within
     the meaning of clause (i) of this proviso;

          (v) The Corporation or any subsidiary of the Corporation  shall (x) by
     dividend or  otherwise,  distribute to all holders of its Common Stock cash
     in (or fix any record date for any such distribution), or (y) repurchase or
     reacquire shares of its Common Stock (other than an Option Share Surrender)
     for, in either  case,  an  aggregate  amount  that,  combined  with (1) the
     aggregate  amount of any other  such  distributions  to all  holders of its
     Common Stock made  exclusively  in cash after the Issuance  Date and within
     the 12 months  preceding the date of payment of such  distribution,  and in
     respect of which no  adjustment  pursuant to this clause (v) has been made,
     (2) the  aggregate  amount  of any  cash  plus the fair  market  value  (as
     determined  in good faith by a resolution  of the Board of Directors of the
     Corporation)  of  consideration  paid in respect of any repurchase or other
     reacquisition  by the  Corporation or any subsidiary of the  Corporation of
     any shares of Common  Stock  (other than an Option  Share  Surrender)  made
     after the  Issuance  Date and  within the 12 months  preceding  the date of
     payment of such distribution or making of such repurchase or reacquisition,
     as the case may be, and in respect of which no adjustment  pursuant to this
     clause (v) has been made,  and (3) the  aggregate of any cash plus the fair
     market value (as  determined  in good faith by a resolution of the Board of
     Directors of the  Corporation) of  consideration  payable in respect of any
     Tender Offer by the Corporation or any of its  subsidiaries  for all or any

<PAGE>

     portion of the Common Stock  concluded  within the 12 months  preceding the
     date of payment of such  distribution  or completion of such  repurchase or
     reacquisition,  as the case may be, and in  respect of which no  adjustment
     pursuant  to clause  (vi) of this  proviso  has been made  (such  aggregate
     amount  combined  with the amounts in clauses  (1), (2) and (3) above being
     the  "Combined  Amount"),  exceeds 10% of the  product of the Market  Price
     (determined without regard to this proviso) for any day in such Measurement
     Period or such other  period  which day is prior to the  earlier of (A) the
     record  date with  respect to such  distribution  and (B) the date on which
     ex-dividend  trading in the Common Stock with respect to such  distribution
     begins or the date of such repurchase or reacquisition, as the case may be,
     times the number of shares of Common Stock  outstanding on such date, then,
     and in each such case,  the Market Price for each such day shall be reduced
     so that the same shall equal the price determined by multiplying the Market
     Price  (determined  without  regard  to this  proviso)  for  such  day by a
     fraction  (i) the  numerator  of which  shall be equal to the Market  Price
     (determined  without  regard to this  proviso)  for such day less an amount
     equal to the quotient of (x) the excess of such  Combined  Amount over such
     10% and (y) the number of shares of Common  Stock  outstanding  on such day
     and  (ii) the  denominator  of which  shall  be equal to the  Market  Price
     (determined  without  regard  to this  proviso)  for  such  day;  provided,
     however,  that in the event the portion of the cash so  distributed or paid
     for the repurchase or reacquisition  of shares  (determined per share based
     on the  number of shares of Common  Stock  outstanding)  applicable  to one
     share  of  Common  Stock  is equal to or  greater  than  the  Market  Price
     (determined  without  regard to this  clause  (v) of this  proviso)  of the
     Common  Stock for any such day,  then in lieu of the  foregoing  adjustment
     with  respect  to such day,  adequate  provision  shall be made so that the
     holders of shares of Series B  Convertible  Preferred  Stock shall have the
     right to  receive  upon  conversion  of  shares  of  Series  B  Convertible
     Preferred  Stock  the  amount  of cash the  holders  of  shares of Series B
     Convertible  Preferred  Stock would have received had the holders of shares
     of  Series B  Convertible  Preferred  Stock  converted  shares  of Series B
     Convertible  Preferred Stock  immediately prior to the record date for such
     distribution or the payment date of such repurchase, as applicable; or

          (vi) A Tender Offer made by the Corporation or any of its subsidiaries
     for all or any  portion of the Common  Stock  shall  expire and such Tender
     Offer (as amended upon the expiration thereof) shall require the payment to
     stockholders  (based on the acceptance (up to any maximum  specified in the
     terms of the Tender  Offer) of Purchased  Shares (as defined  below)) of an
     aggregate  consideration  having a fair market value (as determined in good
     faith by  resolution  of the Board of  Directors of the  Corporation)  that
     combined  together  with (1) the aggregate of the cash plus the fair market
     value  (as  determined  in good  faith  by a  resolution  of the  Board  of
     Directors of the  Corporation),  as of the expiration of such Tender Offer,
     of  consideration  payable  in respect  of any other  Tender  Offers by the
     Corporation or any of its subsidiaries for all or any portion of the Common
     Stock expiring within the 12 months preceding the expiration of such Tender
     Offer and in respect of which no  adjustment  pursuant  to this clause (vi)
     has been made,  (2) the  aggregate  amount of any cash plus the fair market
     value  (as  determined  in good  faith  by a  resolution  of the  Board  of
     Directors  of the  Corporation)  of  consideration  paid in  respect of any
     repurchase or other  reacquisition  by the Corporation or any subsidiary of
     the  Corporation  of any shares of Common Stock (other than an Option Share
     Surrender) made after the Issuance Date and within the 12 months  preceding
     the  expiration  of such Tender Offer and in respect of which no adjustment
     pursuant to clause (v) of this proviso has been made, and (3) the aggregate
     amount of any distributions to all holders of Common Stock made exclusively
     in cash within 12 months  preceding the expiration of such Tender Offer and
     in respect of which no  adjustment  pursuant to clause (v) of this  proviso

<PAGE>

     has been made,  exceeds 10% of the product of the Market Price  (determined
     without regard to this proviso) for any day in such period times the number
     of shares of Common Stock  outstanding  on such day, then, and in each such
     case, the Market Price for such day shall be reduced so that the same shall
     equal the price  determined  by  multiplying  the Market Price  (determined
     without  regard to this proviso) for such day by a fraction,  the numerator
     of which shall be the number of shares of Common Stock  outstanding on such
     day  multiplied  by the Market  Price  (determined  without  regard to this
     proviso) for such day and the  denominator of which shall be the sum of (x)
     the  fair  market  value   (determined   as  aforesaid)  of  the  aggregate
     consideration  payable to  stockholders  based on the acceptance (up to any
     maximum  specified in the terms of the Tender Offer) of all shares  validly
     tendered and not withdrawn as of the last time tenders could have been made
     pursuant to such Tender Offer (the "Expiration Time") (the shares deemed so
     accepted,  up to any such  maximum,  being  referred  to as the  "Purchased
     Shares")  and (y) the  product  of the  number of  shares  of Common  Stock
     outstanding  (less any Purchased Shares) on such day times the Market Price
     (determined  without  regard to this  proviso)  of the Common  Stock on the
     Trading Day next succeeding the Expiration Time. If the application of this
     clause (vi) to any Tender  Offer would  result in an increase in the Market
     Price  (determined  without  regard  to  this  proviso)  for  any  day,  no
     adjustment  shall be made for such Tender  Offer under this clause (vi) for
     such day.

     "Maximum  Share Amount"  means  4,236,000  shares of Common Stock,  or such
greater  number of shares as  permitted  by the rules of the Nasdaq  SmallCap or
such  other  securities  market on which the  Common  Stock is then  listed  for
trading (such amount to be subject to equitable  adjustment from time to time on
terms  reasonably  acceptable to the Majority  Holders for stock  splits,  stock
dividends,  combinations, capital reorganizations and similar events relating to
the Common  Stock  occurring or with  respect to which "ex-"  trading  commences
after the date of filing this Certificate of Designations  with the Secretary of
State of the State of Delaware).

     "Measurement  Period"  means,  with respect to any date,  the period of ten
consecutive Trading Days ending on the Trading Day prior to such date.

     "Nasdaq" means the Nasdaq National Market.

     "Nasdaq SmallCap" means the Nasdaq SmallCap Market.

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

     "NYSE" means the New York Stock Exchange, Inc.

     "Option Share  Surrender"  means the surrender of shares of Common Stock to
the Corporation in payment of the exercise price or tax obligations  incurred in
connection with the exercise of a stock option granted by the Corporation to any
of its employees, directors or consultants.

          "Optional Redemption Event" means any one of the following events:

<PAGE>


     (1) For any  period of five  consecutive  Trading  Days  there  shall be no
closing bid price of the Common Stock on the Nasdaq,  the Nasdaq  SmallCap,  the
NYSE or the AMEX;

     (2) The Common  Stock ceases to be listed for trading on any of the Nasdaq,
the Nasdaq SmallCap, the NYSE or the AMEX;

     (3) The inability for 30 or more days (whether or not  consecutive)  of any
holder of shares of Series B Convertible  Preferred Stock to sell such shares of
Common Stock issued or issuable on  conversion of shares of Series B Convertible
Preferred Stock pursuant to the Registration Statement for any reason on each of
such 30 days;

     (4) The  Corporation  shall (A)  default in the timely  performance  of the
obligation to issue shares of Common Stock upon conversion of shares of Series B
Convertible  Preferred  Stock as and when  required by Section 10 or (B) fail or
default in the timely  performance  of any  material  obligation  (other than as
specifically  set forth  elsewhere in this  definition) to a holder of shares of
Series B  Convertible  Preferred  Stock under the terms of this  Certificate  of
Designations  or under the  Subscription  Agreements,  the  Registration  Rights
Agreements,  the  Warrants or any other  agreement  or document  entered into in
connection with the issuance of shares of Series B Convertible  Preferred Stock,
as such instruments may be amended from time to time;

     (5) (A) Any consolidation or merger of the Corporation with or into another
entity (other than a merger or  consolidation of a subsidiary of the Corporation
into the Corporation or a wholly-owned  subsidiary of the Corporation) where (i)
the surviving  corporation of such  consolidation  or merger is not a Qualifying
Corporation and the  shareholders of the Corporation  immediately  prior to such
transaction  do not  collectively  own at least  51% of the  outstanding  voting
securities of such surviving corporation  immediately following such transaction
or (ii) the common stock of such surviving corporation is not listed for trading
on the NYSE,  the AMEX,  the Nasdaq or the Nasdaq  SmallCap;  or (B) any sale or
other transfer of all or substantially all of the assets of the Corporation; or

     (6) The taking of any action,  including any amendment to the Corporation's
Certificate of Incorporation,  without the consent of the Majority Holders which
materially and adversely  affects the rights of any holder of shares of Series B
Convertible Preferred Stock.

     "Optional  Redemption  Notice"  means a notice  from a holder  of shares of
Series B Convertible  Preferred Stock to the  Corporation  which states (1) that
the holder delivering such notice is thereby requiring the Corporation to redeem
shares of Series B Convertible  Preferred  Stock  pursuant to Section 11, (2) in
general terms the Optional Redemption Event giving rise to such redemption,  and
(3) the number of shares of Series B  Convertible  Preferred  Stock held by such
holder which are to be redeemed.

     "Optional  Redemption  Price" means the greater of (i) the Premium Price on
the  applicable  redemption  date  and (ii) the  Converted  Market  Price on the
applicable redemption date.

<PAGE>

     "Parity  Dividend  Stock"  means any  class or series of the  Corporation's
capital  stock  ranking,  as  to  dividends,  on a  parity  with  the  Series  B
Convertible  Preferred  Stock,  including,  without  limitation,  the  Series  A
Convertible Preferred Stock.

     "Parity  Liquidation  Stock" means any class or series of the Corporation's
capital  stock  having  parity  as to  liquidation  rights  with  the  Series  B
Convertible  Preferred  Stock,  including,  without  limitation,  the  Series  A
Convertible Preferred Stock.

     "Premium Percentage" means 120%.

     "Premium  Price"  means,  for any share of Series B  Convertible  Preferred
Stock as of any date of  determination,  the product obtained by multiplying (a)
the sum of (1) the  Conversion  Amount  plus (2) an amount  equal to the Accrual
Amount on such  share of  Series B  Convertible  Preferred  Stock to the date of
determination,  plus (3) an amount  equal to the accrued and unpaid  interest on
cash   dividends  in  arrears  (as  provided  in  Section  5)  to  the  date  of
determination times (b) the Premium Percentage.

     "Qualifying  Corporation"  means a corporation which (1) has total revenues
of at least $100,000,000 for its most recently completed fiscal year as reported
in its Annual Report on Form 10-K for such year as filed with the SEC or (2) has
a market  capitalization of at least $500,000,000  determined on the date of the
first  public  announcement  of any  consolidation,  merger  or  other  business
combination  transaction with the Corporation based on the arithmetic average of
the  closing  bid  price of such  corporation's  common  stock on the  principal
securities  market for such common  stock for the five Trading Days prior to the
date of such announcement, as reported by Bloomberg, L.P.

     "Redemption  Date"  means  the date of a  redemption  of shares of Series B
Convertible  Preferred Stock pursuant to Section 9(a),  determined in accordance
therewith.

     "Redemption  Price" means the Premium  Price on the  applicable  Redemption
Date.

     "Registration  Rights  Agreements"  means the several  Registration  Rights
Agreements  entered into between the Corporation and the original holders of the
shares of Series B Convertible Preferred Stock, as amended or modified from time
to time in accordance with their respective terms.

     "Registration  Statement" means the Registration  Statement  required to be
filed  by  the  Corporation  with  the  SEC  pursuant  to  Section  2(a)  of the
Registration Rights Agreements.

     "Reset  Period"  means the  applicable  six month period  commencing on the
Initial Reset Date and on each Biannual Reset Date  thereafter and ending on the
day immediately prior to the next Biannual Reset Date.

     "SEC" means the United States Securities and Exchange Commission.

     "SEC  Effective  Date" means the date the  Registration  Statement is first
declared effective by the SEC.

<PAGE>

     "Senior  Dividend  Stock" means any class or series of capital stock of the
Corporation ranking senior as to dividends to the Series B Convertible Preferred
Stock.

     "Senior  Liquidation  Stock" means any class or series of capital  stock of
the  Corporation  ranking  senior  as to  liquidation  rights  to the  Series  B
Convertible Preferred Stock.

     "Series A  Convertible  Preferred  Stock"  means the  Series A  Convertible
Preferred Stock, $.001 par value, of the Corporation.

     "Series B  Convertible  Preferred  Stock"  means the  Series B  Convertible
Preferred Stock, $.001 par value, of the Corporation.

     "Share Limitation Redemption Date" means each date on which the Corporation
is required to redeem shares of Series B Convertible Preferred Stock as provided
in Section 7(a).

     "Share  Limitation  Redemption  Price"  means  (a) the  greater  of (i) the
Premium Price on the applicable  Share  Limitation  Redemption Date and (ii) the
Converted Market Price on the applicable Share Limitation Redemption Date or (b)
if the Corporation shall have ever sought and failed to obtain, or abandoned its
efforts to obtain,  the Stockholder  Approval,  thereafter the Share  Limitation
Redemption Price shall be 105% of the price determined in accordance with clause
(a) of this definition on the applicable Share Limitation Redemption Date.

     "Stockholder  Approval"  shall mean the approval by a majority of the votes
cast by the  holders  of  shares of  Common  Stock (in  person or by proxy) at a
meeting of the stockholders of the Corporation  (duly convened at which a quorum
was present), or a written consent of holders of shares of Common Stock entitled
to such  number  of votes  given  without  a  meeting,  of the  issuance  by the
Corporation of 20% or more of the Common Stock of the Corporation outstanding on
the Issuance  Date for less than the greater of the book or market value of such
Common Stock on conversion of the Series B Convertible  Preferred  Stock, as and
to the extent  required under Rule  4310(c)(25)(H)  of the Nasdaq SmallCap as in
effect  from time to time or any  successor,  replacement  or similar  provision
thereof or of any other market on which the Common Stock is listed for trading.

     "Subscription  Agreements" means the several Subscription Agreements by and
between  the  Corporation  and the  original  holders  of  shares  of  Series  B
Convertible Preferred Stock pursuant to which the shares of Series B Convertible
Preferred Stock were issued.

     "Tender Offer" means a tender offer or exchange offer.

     "Trading  Day"  means a day on  whichever  of (x) the  national  securities
exchange,  (y)  the  Nasdaq  or (z)  the  Nasdaq  SmallCap  which  at  the  time
constitutes  the  principal  securities  market for the Common Stock is open for
general trading.

     "Transfer Agent Agreement" means the Transfer Agent Agreement,  dated as of
December 22, 1999, by and among the  Corporation,  the Conversion  Agent and the
original holders of the Series B Convertible  Preferred Stock for the benefit of
the holders from time to time of shares of Series B Convertible Preferred Stock.

<PAGE>

     "Warrants"  means  the  Common  Stock  Purchase   Warrants  issued  by  the
Corporation  in  connection  with  the  issuance  of  the  shares  of  Series  B
Convertible Preferred Stock.

     Section 2.  Designation  and  Amount.  The shares of such  series  shall be
designated as "Series B Convertible  Preferred Stock",  and the number of shares
constituting the Series B Convertible  Preferred Stock shall be 4,080, and shall
not be subject to increase. The Corporation shall not issue any shares of Series
B  Convertible   Preferred  Stock  other  than  pursuant  to  the   Subscription
Agreements,  unless  such  issuance  shall have been  approved  by the  Majority
Holders.  Any shares of Series B Convertible  Preferred Stock which are redeemed
by the Corporation and retired and any shares of Series B Convertible  Preferred
Stock which are converted in accordance with Section 10 shall be restored to the
status of  authorized,  unissued and  undesignated  shares of the  Corporation's
class of  Preferred  Stock and shall not be  subject  to  issuance,  and may not
thereafter be outstanding, as shares of Series B Convertible Preferred Stock.

     Section 3. Series B Convertible Preferred Stock Capital. In accordance with
Section 154 of the General Corporation Law of the State of Delaware,  the amount
to be  represented  in the Series B Convertible  Preferred  Stock capital of the
Corporation  at all times  for each  outstanding  share of Series B  Convertible
Preferred  Stock  shall be the  greater  of (i) the  Premium  Price and (ii) the
Converted Market Price. The Corporation  shall take such action by resolution of
the Board of Directors  and  otherwise as may be required to maintain the amount
required by this Section 3 to be represented in capital of the  Corporation  for
the Series B  Convertible  Preferred  Stock  capital  not less  frequently  than
quarterly.

     Section 4. Rank.  All Series B Convertible  Preferred  Stock shall rank (i)
senior to the Common Stock, now or hereafter  issued, as to payment of dividends
and distribution of assets upon liquidation,  dissolution,  or winding up of the
Corporation,  whether voluntary or involuntary, (ii) on a parity with the Series
A  Convertible  Preferred  Stock  both  as to  payment  of  dividends  and as to
distribution  of assets  upon  liquidation,  dissolution  or  winding  up of the
Corporation,  whether  voluntary or involuntary,  (iii) senior to any additional
series of the class of Preferred  Stock which series the Board of Directors  may
from  time  to  time  authorize,  both  as to  payment  of  dividends  and as to
distributions  of assets  upon  liquidation,  dissolution,  or winding up of the
Corporation, whether voluntary or involuntary, and (iv) senior to any additional
class of preferred  stock (or series of preferred stock of such class) which the
Board of  Directors  or the  stockholders  may from  time to time  authorize  in
accordance herewith.

     Section 5. Dividends and Distributions. (a) The holders of shares of Series
B Convertible  Preferred  Stock shall be entitled to receive,  when,  as, and if
declared  by the Board of  Directors  out of funds  legally  available  for such
purpose, dividends at the rate of $60.00 per annum per share, and no more, which
shall be fully  cumulative,  shall accrue without  interest (except as otherwise
provided  herein as to dividends in arrears) from the date of original  issuance
of each  share of Series B  Convertible  Preferred  Stock  and shall be  payable
quarterly on February 1, May 1, August 1 and November 1 of each year  commencing
February 1, 2000 (except that if any such date is a Saturday,  Sunday,  or legal
holiday,  then such dividend shall be payable on the next succeeding day that is
not a Saturday, Sunday, or legal holiday) to holders of record as they appear on
the stock books of the  Corporation  on such record dates,  not more than 20 nor
less than 10 days  preceding the payment dates for such  dividends,  as shall be
fixed by the Board.  Dividends on the Series B Convertible Preferred Stock shall
be  paid in cash  or,  in lieu of  paying  such  dividends  and  subject  to the
limitations  in  Section  5(b)  hereof,  the amount of such  dividends  shall be

<PAGE>

included in the Accrual Amount for each share,  at the option of the Corporation
as hereinafter provided. The amount of the dividends payable per share of Series
B  Convertible  Preferred  Stock for each  quarterly  dividend  period  shall be
computed by dividing the annual dividend amount by four. The amount of dividends
payable  for the  initial  dividend  period and any period  shorter  than a full
quarterly  dividend  period  shall be computed on the basis of a 360-day year of
twelve 30-day months.  Dividends required to be paid in cash pursuant to Section
5(b) which are not paid on a payment date,  whether or not such  dividends  have
been  declared,  will bear  interest at the rate of 14% per annum until paid (or
such lesser rate as shall be the maximum rate  allowable by applicable  law). No
dividends or other  distributions,  other than the dividends  payable  solely in
shares of any Junior Dividend  Stock,  shall be paid or set apart for payment on
any shares of Junior  Dividend  Stock,  and no  purchase,  redemption,  or other
acquisition  shall be made by the  Corporation of any shares of Junior  Dividend
Stock  (except for Option  Share  Surrenders),  unless and until all accrued and
unpaid cash dividends on the Series B Convertible  Preferred  Stock and interest
on  dividends  in arrears at the rate  specified  herein shall have been paid or
declared and set apart for payment.

     If at any  time any  dividend  on any  Senior  Dividend  Stock  shall be in
arrears,  in whole or in part,  no dividend  shall be paid or  declared  and set
apart for payment on the Series B Convertible  Preferred  Stock unless and until
all accrued and unpaid  dividends  with  respect to the Senior  Dividend  Stock,
including the full dividends for the then current  dividend  period,  shall have
been paid or  declared  and set apart for  payment,  without  interest.  No full
dividends  shall be paid or  declared  and set apart for  payment  on any Parity
Dividend  Stock for any period  unless all  accrued  but unpaid  dividends  (and
interest on dividends  in arrears at the rate  specified  herein) have been,  or
contemporaneously  are,  paid or declared  and set apart for such payment on the
Series  B  Convertible  Preferred  Stock.  No full  dividends  shall  be paid or
declared and set apart for payment on the Series B Convertible  Preferred  Stock
for  any  period  unless  all  accrued  but  unpaid   dividends  have  been,  or
contemporaneously  are, paid or declared and set apart for payment on the Parity
Dividend Stock for all dividend  periods  terminating on or prior to the date of
payment of such full  dividends.  When  dividends  are not paid in full upon the
Series  B  Convertible  Preferred  Stock  and the  Parity  Dividend  Stock,  all
dividends  paid or declared  and set apart for  payment  upon shares of Series B
Convertible  Preferred  Stock (and  interest on dividends in arrears at the rate
specified  herein) and the Parity  Dividend  Stock shall be paid or declared and
set apart for payment pro rata, so that the amount of dividends paid or declared
and set apart for payment per share on the Series B Convertible  Preferred Stock
and the  Parity  Dividend  Stock  shall in all cases bear to each other the same
ratio  that  accrued  and unpaid  dividends  per share on the shares of Series B
Convertible Preferred Stock and the Parity Dividend Stock bear to each other.

     Any references to  "distribution"  contained in this Section 5 shall not be
deemed to include any stock dividend or  distributions  made in connection  with
any  liquidation,  dissolution,  or  winding  up  of  the  Corporation,  whether
voluntary or involuntary.

     (b) If (x) prior to any dividend payment date the Corporation  notifies the
holders of Series B Convertible  Preferred Stock that the dividends with respect
to such  date  will be paid in  cash or (y) on any  dividend  payment  date  the
Corporation is not in compliance in all material  respects with its  obligations
to the holders of the Series B Convertible  Preferred Stock (including,  without
limitation,  its obligations under the Subscription Agreements, the Registration
Rights  Agreements,  the Warrants and this  Certificate of  Designations),  such
dividends  must be timely paid in cash.  If clauses (x) or (y) of the  foregoing
sentence do not apply on any dividend  payment date,  the  Corporation  may, but
shall not be required to, pay the  applicable  dividends in cash.  The amount of

<PAGE>

any dividends not paid in cash shall be included in the Accrual  Amount for each
share of Series B Convertible Preferred Stock.

     (c) Neither the  Corporation  nor any subsidiary of the  Corporation  shall
redeem,  repurchase  or otherwise  acquire in any one  transaction  or series of
related  transactions any shares of Common Stock,  Parity Dividend Stock, Parity
Liquidation  Stock,  Junior  Dividend Stock or Junior  Liquidation  Stock if the
number  of  shares  so  repurchased,  redeemed  or  otherwise  acquired  in such
transaction  or series of  related  transactions  (excluding  any  Option  Share
Surrender)  is more than either (x) 5% of the number of shares of Common  Stock,
Parity Dividend Stock, Parity Liquidation Stock, Junior Dividend Stock or Junior
Liquidation  Stock, as the case may be,  outstanding  immediately  prior to such
transaction or series of related  transactions or (y) 1% of the number of shares
of Common  Stock,  Parity  Dividend  Stock,  Parity  Liquidation  Stock,  Junior
Dividend  Stock or Junior  Liquidation  Stock,  as the case may be,  outstanding
immediately prior to such transaction or series of related  transactions if such
transaction or series of related transactions is with any one person or group of
affiliated persons, unless the Corporation or such subsidiary offers to purchase
for cash from each holder of shares of Series B Convertible  Preferred  Stock at
the time of such  redemption,  repurchase or acquisition  the same percentage of
such holder's  shares of Series B Convertible  Preferred Stock as the percentage
of the number of  outstanding  shares of Common Stock,  Parity  Dividend  Stock,
Parity Liquidation Stock,  Junior Dividend Stock or Junior Liquidation Stock, as
the case may be, to be so redeemed,  repurchased or acquired at a purchase price
per share of Series B  Convertible  Preferred  Stock equal to the greater of (i)
the  Premium  Price in effect on the date of purchase  pursuant to this  Section
5(c) and (ii) the  Converted  Market  Price on the date of purchase  pursuant to
this Section 5(c).

     (d) Neither the Corporation nor any subsidiary of the Corporation shall (1)
make any  Tender  Offer  for  outstanding  shares of Common  Stock,  unless  the
Corporation  contemporaneously  therewith  makes an offer,  or (2) enter into an
agreement regarding a Tender Offer for outstanding shares of Common Stock by any
person other than the Corporation or any subsidiary of the  Corporation,  unless
such person agrees with the Corporation to make an offer, in either such case to
each holder of  outstanding  shares of Series B Convertible  Preferred  Stock to
purchase  for  cash at the  time of  purchase  in such  Tender  Offer  the  same
percentage of shares of Series B Convertible Preferred Stock held by such holder
as the percentage of outstanding  shares of Common Stock offered to be purchased
in such  Tender  Offer at a price per share of  Series B  Convertible  Preferred
Stock  equal to the  greater of (i) the  Premium  Price in effect on the date of
purchase  pursuant to this Section 5(d) and (ii) the  Converted  Market Price on
the date of purchase pursuant to this Section 5(d).

     Section  6.  Liquidation  Preference.   In  the  event  of  a  liquidation,
dissolution, or winding up of the Corporation, whether voluntary or involuntary,
the holders of Series B Convertible Preferred Stock shall be entitled to receive
out of the assets of the  Corporation,  whether  such assets  constitute  stated
capital or surplus of any  nature,  an amount per share of Series B  Convertible
Preferred Stock equal to the  Liquidation  Preference,  and no more,  before any
payment  shall  be made or any  assets  distributed  to the  holders  of  Junior
Liquidation  Stock;  provided,  however,  that such rights  shall  accrue to the
holders  of Series B  Convertible  Preferred  Stock  only in the event  that the
Corporation's payments with respect to the liquidation preference of the holders
of Senior Liquidation Stock are fully met. After the liquidation  preferences of
the Senior Liquidation Stock are fully met, the entire assets of the Corporation
available for distribution shall be distributed ratably among the holders of the
Series  B  Convertible  Preferred  Stock  and any  Parity  Liquidation  Stock in
proportion to the respective preferential amounts to which each is entitled (but

<PAGE>

only to the extent of such preferential  amounts).  After payment in full of the
liquidation price of the shares of the Series B Convertible  Preferred Stock and
the Parity  Liquidation  Stock, the holders of such shares shall not be entitled
to any further  participation  in any distribution of assets by the Corporation.
Neither a consolidation  or merger of the Corporation  with another  corporation
nor a sale or  transfer  of all or part of the  Corporation's  assets  for cash,
securities, or other property in and of itself will be considered a liquidation,
dissolution or winding up of the Corporation.

     Section 7. Certain Redemption Rights.

     (a) Redemption Based on Maximum Share Amount. (1) Notwithstanding any other
provision herein,  unless the Stockholder Approval shall have been obtained from
the stockholders of the Corporation or waived by the Nasdaq, the Nasdaq SmallCap
or other securities  market on which the Common Stock is then listed, so long as
the Common Stock is listed on the Nasdaq,  the Nasdaq SmallCap,  the NYSE or the
AMEX the Corporation shall not be required to issue upon conversion of shares of
Series B  Convertible  Preferred  Stock  pursuant  to  Section  10 more than the
Maximum  Share  Amount.  The Maximum  Share Amount shall be allocated  among the
shares of Series B Convertible  Preferred Stock at the time of initial  issuance
thereof  pro rata  based on the  initial  issuance  of 4,000  shares of Series B
Convertible Preferred Stock. Each certificate for shares of Series B Convertible
Preferred  Stock  initially  issued  shall bear a  notation  as to the number of
shares  constituting  the portion of the Maximum  Share Amount  allocated to the
shares of Series B Convertible  Preferred Stock  represented by such certificate
for purposes of conversion thereof. Upon surrender of any certificate for shares
of Series B Convertible Preferred Stock for transfer or re-registration  thereof
(or, at the option of the holder,  for  conversion  pursuant to Section 10(a) of
less than all of the shares of Series B Convertible  Preferred Stock represented
thereby),  the Corporation  shall make a notation on the new certificate  issued
upon such transfer or re-registration or evidencing such unconverted  shares, as
the case may be, as to the  remaining  number of shares of Common Stock from the
Maximum Share Amount remaining  available for conversion of the shares of Series
B  Convertible  Preferred  Stock  evidenced  by  such  new  certificate.  If any
certificate  for shares of Series B Convertible  Preferred  Stock is surrendered
for split-up into two or more  certificates  representing an aggregate number of
shares of Series B Convertible  Preferred Stock equal to the number of shares of
Series  B  Convertible   Preferred  Stock  represented  by  the  certificate  so
surrendered (as reduced by any contemporaneous  conversion of shares of Series B
Convertible Preferred Stock represented by the certificate so surrendered), each
certificate  issued on such split-up shall bear a notation of the portion of the
Maximum Share Amount  allocated  thereto  determined by pro rata allocation from
among the  remaining  portion  of the  Maximum  Share  Amount  allocated  to the
certificate  so  surrendered.  If any shares of Series B  Convertible  Preferred
Stock  represented  by a single  certificate  are  converted in full pursuant to
Section 10, all of the portion of the Maximum  Share  Amount  allocated  to such
shares of Series B Convertible Preferred Stock which remains unissued after such
conversion shall be re-allocated pro rata to the outstanding  shares of Series B
Convertible  Preferred Stock held of record by the holder of record at the close
of business on the date of such conversion of the shares of Series B Convertible
Preferred Stock so converted,  and if there shall be no other shares of Series B
Convertible  Preferred  Stock  held of  record  by such  holder  at the close of
business on such date,  then such  portion of the Maximum  Share Amount shall be
allocated  pro rata among the  shares of Series B  Convertible  Preferred  Stock
outstanding on such date.

     (2) The  Corporation  shall  promptly,  but in no  event  later  than  five
Business  Days after the  occurrence,  give  notice to each  holder of shares of
Series B Convertible  Preferred Stock (by telephone line facsimile  transmission

<PAGE>

at such number as such holder has  specified in writing to the  Corporation  for
such purposes or, if such holder shall not have  specified  any such number,  by
overnight courier or first class mail, postage prepaid, at such holder's address
as the same  appears on the stock  books of the  Corporation)  and any holder of
shares  of  Series B  Convertible  Preferred  Stock  may at any time  after  the
occurrence give notice to the Corporation, in either case, if on any ten Trading
Days within any period of 20 consecutive  Trading Days the Corporation would not
have been required to convert shares of Series B Convertible  Preferred Stock of
such holder in accordance with Section 10(a) as a consequence of the limitations
set forth in Section  7(a)(1) had the shares of Series B  Convertible  Preferred
Stock held by such holder been  converted in full into Common Stock on each such
day,  determined  without  regard  to the  limitation,  if any,  on such  holder
contained  in the  proviso to the  second  sentence  of Section  10(a) (any such
notice,  whether  given by the  Corporation  or a holder,  an  "Inconvertibility
Notice").  If the  Corporation  shall  have given or been  required  to give any
Inconvertibility  Notice,  or if a holder shall have given any  Inconvertibility
Notice, then within ten Trading Days after such Inconvertibility Notice is given
or was required to be given, the holder receiving or giving, as the case may be,
such  Inconvertibility  Notice  shall  have the right by  written  notice to the
Corporation  (which  written  notice may be  contained  in the  Inconvertibility
Notice given by such holder) to direct the  Corporation to redeem the portion of
such holder's outstanding shares of Series B Convertible Preferred Stock (which,
if  applicable,  shall be all of such  holder's  outstanding  shares of Series B
Convertible Preferred Stock) as shall not, on the Business Day prior to the date
of such redemption,  be convertible into shares of Common Stock by reason of the
limitations  set forth in  Section  7(a)(1)  (determined  without  regard to the
limitation,  if any,  on  beneficial  ownership  of Common  Stock by such holder
contained in the proviso to the second sentence of Section  10(a)),  within five
Business Days after such holder so directs the Corporation, at a price per share
equal to the Share Limitation  Redemption Price. If a holder of shares of Series
B Convertible  Preferred  Stock directs the  Corporation  to redeem  outstanding
shares  of  Series B  Convertible  Preferred  Stock  and,  prior to the date the
Corporation is required to redeem such shares of Series B Convertible  Preferred
Stock, the Corporation would have been able, within the limitations set forth in
Section 7(a)(1),  to convert all of such holder's shares of Series B Convertible
Preferred  Stock  (determined  without  regard  to the  limitation,  if any,  on
beneficial  ownership of shares of Common Stock by such holder  contained in the
proviso to the second  sentence of Section 10(a)) on any ten Trading Days within
any period of 15  consecutive  Trading  Days  commencing  after the period of 20
consecutive  Trading  Days  which gave rise to the  applicable  Inconvertibility
Notice from the  Corporation  or such  holder of shares of Series B  Convertible
Preferred Stock, as the case may be, had all of such holder's shares of Series B
Convertible Preferred Stock been surrendered for conversion into Common Stock on
each of such ten  Trading  Days  within  such 15 Trading  Day  period,  then the
Corporation  shall not be required to redeem any shares of Series B  Convertible
Preferred Stock by reason of such Inconvertibility Notice.

     (3)  Notwithstanding  the  giving  of any  Inconvertibility  Notice  by the
Corporation to the holders of Series B Convertible  Preferred  Stock pursuant to
Section 7(a)(2) or the giving or the absence of any notice by the holders of the
Series B Convertible  Preferred  Stock in response  thereto or any redemption of
shares of Series B  Convertible  Preferred  Stock  pursuant to Section  7(a)(2),
thereafter the provisions of Section  7(a)(2) shall continue to be applicable on
any occasion unless the  Stockholder  Approval shall have been obtained from the
stockholders of the Corporation or waived by the Nasdaq, the Nasdaq SmallCap, or
other securities market on which the Common Stock is listed for trading.

<PAGE>

     (4) On each  Share  Limitation  Redemption  Date (or such  later  date as a
holder of shares of Series B Convertible  Preferred Stock shall surrender to the
Corporation the certificate(s) for the shares of Series B Convertible  Preferred
Stock being redeemed  pursuant to this Section 7(a)), the Corporation shall make
payment  in  immediately  available  funds of the  applicable  Share  Limitation
Redemption  Price to such  holder of shares  of Series B  Convertible  Preferred
Stock to be redeemed to or upon the order of such  holder as  specified  by such
holder in writing to the  Corporation  at least one  Business  Day prior to such
Share Limitation Redemption Date. Upon redemption of less than all of the shares
of Series B Convertible  Preferred Stock evidenced by a particular  certificate,
promptly, but in no event later than three Business Days after surrender of such
certificate  to the  Corporation,  the  Corporation  shall  issue a  replacement
certificate for the shares of Series B Convertible  Preferred Stock evidenced by
such  certificate  which have not been  redeemed.  Only whole shares of Series B
Convertible Preferred Stock may be redeemed.

     (5)  (A)  Notwithstanding  any  other  provision  of  this  Certificate  of
Designations,  if an  Inconvertibility  Day occurs by reason of events which are
not solely within the control of the Corporation, the Corporation shall have the
right to give a Control Notice to the holders of Series B Convertible  Preferred
Stock at any time  after  such  Inconvertibility  Day  occurs  and  prior to the
earlier of (1) the date on which all  holders of shares of Series B  Convertible
Preferred  Stock  who had the  right  (other  than as  limited  by this  Section
7(a)(5)) to require  redemption of any shares of Series B Convertible  Preferred
Stock by reason of the  occurrence of such  Inconvertibility  Day no longer have
such right and (2) the applicable Share Limitation  Redemption Date by reason of
the  earliest  notice  given by any  holder of  shares  of Series B  Convertible
Preferred  Stock  directing the  Corporation to redeem such shares in accordance
with Section 7(a)(2) by reason of such Inconvertibility Day. For purposes of the
Control Notice given pursuant to this Section 7(a)(5), an  Inconvertibility  Day
shall be deemed to have occurred by reason of events which are not solely within
the control of the Corporation if a requirement of the Corporation to redeem, or
a right of any  holder  of shares of  Series B  Convertible  Preferred  Stock to
require redemption of, shares of Series B Convertible  Preferred Stock by reason
thereof would result in the Corporation  being required to classify the Series B
Convertible  Preferred Stock as redeemable preferred stock on a balance sheet of
the  Corporation  prepared in  accordance  with  Generally  Accepted  Accounting
Principles  and  Regulation  S-X of the SEC. If the  Corporation  timely gives a
Control Notice to the holders of shares of Series B Convertible Preferred Stock,
then in lieu of payment of the Share  Limitation  Redemption Price pursuant to a
redemption  notice  given by any  holder  of  shares  of  Series  B  Convertible
Preferred   Stock  in  accordance   with  Section  7(a)(2)  by  reason  of  such
Inconvertibility Day and commencing on such  Inconvertibility Day the Conversion
Price for all outstanding shares of Series B Convertible Preferred Stock will be
80% of the amount the Conversion  Price would  otherwise be. Such  adjustment of
the Conversion Price shall continue in effect until the earliest of (x) the date
which is 90 days after the  Stockholder  Approval  shall have been obtained from
the  stockholders  of the  Corporation or waived by the Nasdaq SmallCap or other
securities  market on which the Common  Stock is then  listed,  (y) the date any
further  adjustments  are made  following  a failure to obtain  the  Stockholder
Approval as provided below, and (z) the date when shares of Series B Convertible
Preferred Stock are no longer outstanding.  On or after the date the Corporation
gives  such  Control  Notice,  upon  notice  from  the  Majority  Holders,   the
Corporation  promptly shall call a special  meeting of its  stockholders,  to be
held not later than 60 days after such notice is given,  to seek the Stockholder
Approval for the issuance of all shares of Common Stock issuable upon conversion
of the Series B Convertible  Preferred  Stock in accordance  with Section 10 and
shall use its best efforts to obtain the Stockholder  Approval.  The Corporation
shall  prepare  and file with the SEC within 20 days after such  notice is given

<PAGE>

preliminary  proxy materials which set forth a proposal to seek such Stockholder
Approval.  The Corporation  shall provide the Majority Holders an opportunity to
consult  with the  Corporation  regarding  the  content of such proxy  materials
insofar as it relates to the  Stockholder  Approval by providing  copies of such
preliminary  proxy materials and any revised  preliminary proxy materials to the
Majority Holders a reasonable period of time prior to their filing with the SEC.
The  Corporation  shall furnish to each holder of shares of Series B Convertible
Preferred  Stock a copy of its  definitive  proxy  materials  for  such  special
meeting and any  amendments or supplements  thereto  promptly after the same are
mailed  to  stockholders  or filed  with the SEC.  Upon the  earlier  of (i) the
failure to obtain the  Stockholder  Approval at the special  meeting or (ii) the
failure to hold the special  meeting within such 60-day period,  the Corporation
shall so notify the holders of shares of Series B  Convertible  Preferred  Stock
and,  if  requested  by notice to the  Corporation  from the  Majority  Holders,
commencing  on the  Business Day  following  the  Corporation's  receipt of such
notice,  the Conversion Price of the outstanding  shares of Series B Convertible
Preferred  Stock will be 60% of the amount the Conversion  Price would otherwise
be without  regard to other  adjustments  pursuant  to this  Section  7(a)(5) or
Section 11(b)(4).

     (B) If and  for so  long  as an  adjustment  of  the  Conversion  Price  is
simultaneously  required by this Section  7(a)(5) and by Section  11(b)(4),  the
applicable  Conversion  Price shall be the lower of the two amounts  required by
each such section.

     (C) The rights of holders of shares of Series B Convertible Preferred Stock
to require  redemption  of their  shares and exercise  other rights  pursuant to
Sections  7(a)(1)  through  7(a)(4) by reason of an  Inconvertibility  Day as to
which the Corporation  does not have a right to give a Control Notice,  or fails
to exercise such right on a timely basis,  shall not be limited by the operation
of this Section 7(a)(5).

     (b) No Other  Redemption  at  Option  of  Holders.  The  shares of Series B
Convertible   Preferred  Stock  shall  not  be  subject  to  redemption  by  the
Corporation  at the option of the Holders except as provided in Section 7(a) and
Section 11.

     Section 8. No Sinking Fund.  The shares of Series B  Convertible  Preferred
Stock shall not be subject to the operation of a purchase, retirement or sinking
fund.

     Section 9. Optional Redemption.

     (a) Corporation  Optional  Redemption.  If (1) the Corporation  shall be in
compliance  in all  material  respects  with its  obligations  to the holders of
shares of Series B Convertible  Preferred Stock (including,  without limitation,
its obligations  under the  Subscription  Agreements,  the  Registration  Rights
Agreements,   the  Warrants  and  the   provisions   of  this   Certificate   of
Designations),  (2) on the date the Corporation  Optional  Redemption  Notice is
given and at all times until the Redemption Date, the Registration  Statement is
effective and available for use by each holder of shares of Series B Convertible
Preferred Stock for the resale of shares of Common Stock acquired by such holder
upon  conversion of all shares of Series B Convertible  Preferred  Stock held by
such  holder and (3) no  Optional  Redemption  Event  shall have  occurred  with
respect to which, on the date a Corporation  Optional Redemption Notice is to be
given or on the  Redemption  Date,  any holder of shares of Series B Convertible
Preferred  Stock (A) shall be entitled to exercise  optional  redemption  rights
under Section 11 by reason of such Optional  Redemption  Event or (B) shall have
exercised optional redemption rights under Section 11 by reason of such Optional
Redemption Event and the Corporation shall not have paid the Optional Redemption
Price to such holder, then the Corporation shall have the right,  exercisable by

<PAGE>

giving a Corporation  Optional  Redemption  Notice not less than 30 days or more
than 50 days prior to the Redemption Date to all holders of record of the shares
of Series B Convertible  Preferred Stock, at any time to redeem all or from time
to time to redeem  any part of the  outstanding  shares of Series B  Convertible
Preferred Stock in accordance  with this Section 9(a). If the Corporation  shall
redeem less than all outstanding shares of Series B Convertible Preferred Stock,
such  redemption  shall be made as nearly as practical pro rata from all holders
of shares of Series B Convertible  Preferred  Stock.  Any  Corporation  Optional
Redemption  Notice  under this  Section  9(a)  shall be given to the  holders of
record of the shares of Series B Convertible  Preferred Stock at their addresses
appearing on the records of the Corporation; provided, however, that any failure
or defect in the giving of such notice to any such  holder  shall not affect the
validity  of notice  to or the  redemption  of  shares  of Series B  Convertible
Preferred Stock of any other holder.  On the Redemption Date (or such later date
as a holder of shares of Series B Convertible  Preferred Stock surrenders to the
Corporation  the  certificate(s)  for shares of Series B  Convertible  Preferred
Stock to be redeemed  pursuant to this Section 9(a)), the Corporation shall make
payment of the applicable  Redemption Price to each holder of shares of Series B
Convertible  Preferred  Stock to be redeemed in immediately  available  funds to
such account as specified by such holder in writing to the  Corporation at least
one  Business Day prior to the  Redemption  Date. A holder of shares of Series B
Convertible  Preferred Stock to be redeemed  pursuant to this Section 9(a) shall
be entitled to convert such shares of Series B  Convertible  Preferred  Stock in
accordance  with Section 10 (x) through the day prior to the Redemption Date and
(y) if the  Corporation  shall fail to pay the Redemption  Price of any share of
Series B  Convertible  Preferred  Stock when due, at any time after the due date
thereof until such date as the  Corporation  pays the  Redemption  Price of such
share of Series B Convertible  Preferred Stock. No share of Series B Convertible
Preferred  Stock  as to which  the  holder  exercises  the  right of  conversion
pursuant to Section 10 or the optional  redemption  right pursuant to Section 11
may be redeemed by the Corporation pursuant to this Section 9(a) on or after the
date of exercise of such conversion right or optional  redemption  right, as the
case may be,  regardless of whether the Corporation  Optional  Redemption Notice
shall have been given  prior to, or on or after,  the date of  exercise  of such
conversion right or optional redemption right, as the case may be.

     (b) Final  Redemption.  The Corporation shall have the right to redeem all,
but not less than all,  outstanding  shares  of Series B  Convertible  Preferred
Stock at any time on or after the date which is 1,096  days  after the  Issuance
Date so long as (1) the  Corporation  shall  be in  compliance  in all  material
respects  with its  obligations  to the  holders  of the  Series  B  Convertible
Preferred  Stock  (including,  without  limitation,  its  obligations  under the
Subscription  Agreements,  the Registration Rights Agreements,  the Warrants and
this  Certificate of  Designations)  and (2) no Optional  Redemption Event shall
have occurred with respect to which on the date a Final Redemption  Notice is to
be given or on the  Final  Redemption  Date,  any  holder  of shares of Series B
Convertible   Preferred  Stock  (a)  shall  be  entitled  to  exercise  optional
redemption  rights under Section 11 by reason of such Optional  Redemption Event
or (b) shall have  exercised  optional  redemption  rights  under  Section 11 by
reason of such Optional Redemption Event and the Corporation shall not have paid
the Optional  Redemption  Price to such holder.  In order to exercise its rights
under this Section 9(b), the Corporation  shall give a Final  Redemption  Notice
not less than 30 Trading  Days or more than 50  Trading  Days prior to the Final
Redemption  Date to all holders of record of the shares of Series B  Convertible
Preferred Stock.  Any Final  Redemption  Notice shall be given to the holders of
record of the shares of Series B Convertible  Preferred  Stock by telephone line
facsimile transmission to such number as shown on the records of the Corporation
for such purpose; provided, however, that any failure or defect in the giving of
such notice to any such holder shall not affect the validity of notice to or the

<PAGE>

redemption  of  shares  of  Series B  Convertible  Preferred  Stock of any other
holder.  On the Final  Redemption Date (or such later date as a holder of shares
of Series B  Convertible  Preferred  Stock  surrenders  to the  Corporation  the
certificate(s) for shares of Series B Convertible Preferred Stock to be redeemed
pursuant  to this  Section  9(b)),  the  Corporation  shall make  payment of the
applicable  Final  Redemption  Price  to each  holder  of  shares  of  Series  B
Convertible  Preferred  Stock to be redeemed in immediately  available  funds to
such account as specified by such holder in writing to the  Corporation at least
one  Business  Day prior to the  Final  Redemption  Date.  A holder of shares of
Series B  Convertible  Preferred  Stock to be redeemed  pursuant to this Section
9(b) shall be entitled to convert such shares of Series B Convertible  Preferred
Stock in  accordance  with  Section  10 (x)  through  the day prior to the Final
Redemption  Date  and  (y) if the  Corporation  shall  fail  to  pay  the  Final
Redemption Price of any share of Series B Convertible  Preferred Stock when due,
at any time after the due date thereof until such date as the  Corporation  pays
the Final Redemption Price of such share of Series B Convertible Preferred Stock
to such holder.  No share of Series B Convertible  Preferred Stock as to which a
holder exercises the right of conversion  pursuant to Section 10 or the optional
redemption  right  pursuant  to Section 11 may be  redeemed  by the  Corporation
pursuant  to this  Section  9(b)  on or  after  the  date  of  exercise  of such
conversion right or optional redemption right, as the case may be, regardless of
whether  the Final  Redemption  Notice  shall have been given prior to, or on or
after,  the date of exercise  of such  conversion  right or optional  redemption
right, as the case may be.

     (c) No Other  Optional  Redemption.  The  shares  of  Series B  Convertible
Preferred  Stock  shall  not be  subject  to  redemption  at the  option  of the
Corporation except as provided in Sections 9(a) and 9(b).

     Section 10. Conversion.

     (a) Conversion at Option of Holder. The holders of the Series B Convertible
Preferred  Stock may at any time on or after the  Issuance  Date  convert at any
time all or from time to time any part of their  shares of Series B  Convertible
Preferred  Stock into fully paid and  nonassessable  shares of Common  Stock and
such other  securities and property as herein  provided.  Each share of Series B
Convertible  Preferred  Stock may be converted  at the office of the  Conversion
Agent or at such other  additional  office or  offices,  if any, as the Board of
Directors may designate, into such number of fully paid and nonassessable shares
of Common Stock  (calculated as to each  conversion to the nearest  1/100th of a
share) determined by dividing (x) the sum of (i) the Conversion Amount,  (ii) an
amount  equal  to the  Accrual  Amount  on the  share of  Series  B  Convertible
Preferred  Stock being  converted to the applicable  Conversion  Date, and (iii)
accrued but unpaid interest on the dividends  required to be paid in cash on the
share of Series B Convertible  Preferred Stock being converted in arrears to the
applicable  Conversion  Date  at the  rate  provided  in  Section  5 by (y)  the
Conversion  Price for such Conversion Date (the  "Conversion  Rate");  provided,
however,  that in no event  shall any  holder of shares of Series B  Convertible
Preferred  Stock be  entitled  to  convert  any  shares of Series B  Convertible
Preferred  Stock in  excess of that  number  of  shares of Series B  Convertible
Preferred  Stock upon conversion of which the sum of (1) the number of shares of
Common Stock  beneficially  owned by such holder and all  Aggregated  Persons of
such holder (other than shares of Common Stock deemed beneficially owned through
the ownership of (x) unconverted shares of Series B Convertible  Preferred Stock
and (y) the  unconverted or  unexercised  portion of any  instrument,  including
without limitation the Warrants, which contains limitations similar to those set
forth in this  sentence)  and (2) the number of shares of Common Stock  issuable
upon the  conversion of the number of shares of Series B  Convertible  Preferred
Stock with respect to which the  determination  in this  proviso is being made,

<PAGE>

would result in beneficial  ownership by such holder and all Aggregated  Persons
of such holder of more than 4.9% of the outstanding  shares of Common Stock. For
purposes  of the  proviso  to the  immediately  preceding  sentence,  beneficial
ownership  shall be determined in accordance  with Section 13(d) of the Exchange
Act and Regulation 13D-G thereunder,  except as otherwise provided in clause (1)
of the proviso to the immediately preceding sentence.

     (b) Other Provisions. (1) Notwithstanding anything in this Section 10(b) to
the contrary,  no change in the Conversion Amount pursuant to this Section 10(b)
shall actually be made until the cumulative effect of the adjustments called for
by this Section 10(b) since the date of the last change in the Conversion Amount
would change the Conversion Amount by more than 1%. However, once the cumulative
effect would result in such a change,  then the Conversion Amount shall actually
be changed to reflect all  adjustments  called for by this Section 10(b) and not
previously  made.  Notwithstanding  anything in this Section 10(b), no change in
the  Conversion  Amount  shall be made that would result in the price at which a
share of Series B Convertible  Preferred  Stock is converted being less than the
par  value of the  Common  Stock  into  which  shares  of  Series B  Convertible
Preferred Stock are at the time convertible.

     (2) The holders of shares of Series B  Convertible  Preferred  Stock at the
close of  business  on the record  date for any  dividend  payment to holders of
Series B Convertible  Preferred  Stock shall be entitled to receive the dividend
payable   on  such   shares  on  the   corresponding   dividend   payment   date
notwithstanding  the conversion  thereof after such dividend payment record date
or the  Corporation's  default in payment of the dividend  due on such  dividend
payment  date;  provided,  however,  that  the  holder  of  shares  of  Series B
Convertible Preferred Stock surrendered for conversion during the period between
the close of business on any record date for a dividend  payment and the opening
of  business  on  the  corresponding  dividend  payment  date  must  pay  to the
Corporation,  within five days after receipt by such holder,  an amount equal to
the  dividend  payable  on such  shares on such  dividend  payment  date if such
dividend is paid by the Corporation to such holder. A holder of shares of Series
B Convertible  Preferred  Stock on a record date for a dividend  payment who (or
whose  transferee)  tenders  any of such  shares for  conversion  into shares of
Common  Stock on or after such  dividend  payment date will receive the dividend
payable by the  Corporation  on such  shares of Series B  Convertible  Preferred
Stock on such date, and the  converting  holder need not make any payment of the
amount of such dividend in connection with such conversion of shares of Series B
Convertible  Preferred  Stock.  Except as provided above, no adjustment shall be
made in  respect  of cash  dividends  on Common  Stock or  Series B  Convertible
Preferred  Stock that may be  accrued  and  unpaid at the date of  surrender  of
shares of Series B Convertible Preferred Stock.

     (3) (A) The right of the holders of Series B Convertible Preferred Stock to
convert  their  shares  shall  be  exercised  by  giving  (which  may be done by
telephone line  facsimile  transmission)  a Conversion  Notice to the Conversion
Agent,  with a copy to the  Corporation.  If a holder  of  Series B  Convertible
Preferred  Stock elects to convert any shares of Series B Convertible  Preferred
Stock in  accordance  with Section  10(a),  such holder shall not be required to
surrender the  certificate(s)  representing  such shares of Series B Convertible
Preferred  Stock  to the  Corporation  unless  all of the  shares  of  Series  B
Convertible Preferred Stock represented thereby are so converted. Each holder of
shares  of  Series B  Convertible  Preferred  Stock  and the  Corporation  shall
maintain records showing the number of shares so converted and the dates of such
conversions or shall use such other method,  satisfactory to such holder and the
Corporation,  so as to not require physical  surrender of such certificates upon
each such conversion.  In the event of any dispute or discrepancy,  such records

<PAGE>

of the  Corporation  shall be controlling  and  determinative  in the absence of
manifest  error.  Notwithstanding  the  foregoing,  if any  shares  of  Series B
Convertible  Preferred Stock evidenced by a particular  certificate therefor are
converted as aforesaid,  the holder of Series B Convertible  Preferred Stock may
not transfer the certificate(s) representing such shares of Series B Convertible
Preferred   Stock  unless  such  holder   first   physically   surrenders   such
certificate(s)  to the  Corporation,  whereupon the  Corporation  will forthwith
issue  and  deliver  upon  the  order  of such  holder  of  shares  of  Series B
Convertible Preferred Stock new certificate(s) of like tenor, registered as such
holder of shares of Series B Convertible  Preferred  Stock (upon payment by such
holder  of  shares of Series B  Convertible  Preferred  Stock of any  applicable
transfer taxes) may request,  representing in the aggregate the remaining number
of  shares  of  Series  B  Convertible   Preferred  Stock  represented  by  such
certificate(s).  Each holder of shares of Series B Convertible  Preferred Stock,
by acceptance of a certificate for such shares, acknowledges and agrees that (1)
by reason of the  provisions  of this  paragraph,  following  conversion  of any
shares of Series B Convertible  Preferred Stock represented by such certificate,
the number of shares of Series B Convertible Preferred Stock represented by such
certificate  may be less than the number of shares  stated on such  certificate,
and (2) the  Corporation  may place a legend on the  certificates  for shares of
Series B Convertible Preferred Stock which refers to or describes the provisions
of this paragraph.

     (B) The  Corporation  shall pay any transfer tax arising in connection with
any conversion of shares of Series B Convertible Preferred Stock except that the
Corporation shall not, however,  be required to pay any tax which may be payable
in respect of any transfer involved in the issue and delivery upon conversion of
shares of Common Stock or other securities or property in a name other than that
of the holder of the shares of the Series B  Convertible  Preferred  Stock being
converted,  and the  Corporation  shall not be  required to issue or deliver any
such  shares or other  securities  or  property  unless  and until the person or
persons  requesting the issuance  thereof shall have paid to the Corporation the
amount of any such tax or shall  have  established  to the  satisfaction  of the
Corporation that such tax has been paid. The number of shares of Common Stock to
be issued upon each conversion of shares of Series B Convertible Preferred Stock
shall be the number set forth in the applicable  Conversion  Notice which number
shall be conclusive absent manifest error. The Corporation shall notify a holder
who has given a  Conversion  Notice of any claim of  manifest  error  within one
Trading Day after such holder gives such Conversion  Notice and no such claim of
error shall limit or delay performance of the Corporation's  obligation to issue
upon such  conversion  the  number of  shares of Common  Stock  which are not in
dispute.  A  Conversion  Notice shall be deemed for all purposes to be in proper
form unless the Corporation  notifies a holder of shares of Series B Convertible
Preferred Stock being converted within one Trading Day after a Conversion Notice
has been given (which notice shall specify all defects in the Conversion Notice)
and any  Conversion  Notice  containing  any such defect  shall  nonetheless  be
effective on the date given if the converting  holder promptly corrects all such
defects.

     (4) The Corporation (and any successor  corporation)  shall take all action
necessary so that a number of shares of the authorized but unissued Common Stock
(or common stock in the case of any successor corporation) sufficient to provide
for the conversion of the Series B Convertible  Preferred Stock outstanding upon
the basis hereinbefore provided are at all times reserved by the Corporation (or
any successor  corporation),  free from preemptive  rights, for such conversion,
subject to the provisions of the next succeeding  paragraph.  If the Corporation
shall issue any  securities  or make any change in its capital  structure  which
would  change the number of shares of Common  Stock into which each share of the

<PAGE>

Series B Convertible  Preferred  Stock shall be convertible as herein  provided,
the  Corporation  shall at the same  time  also make  proper  provision  so that
thereafter  there  shall be a  sufficient  number  of  shares  of  Common  Stock
authorized  and reserved,  free from  preemptive  rights,  for conversion of the
outstanding  Series B Convertible  Preferred  Stock on the new basis.  If at any
time the number of authorized  but unissued  shares of Common Stock shall not be
sufficient to effect the conversion of all of the outstanding shares of Series B
Convertible  Preferred Stock,  the Corporation  promptly shall seek, and use its
best  efforts to obtain  and  complete,  such  corporate  action as may,  in the
opinion of its counsel,  be necessary  to increase its  authorized  but unissued
shares of Common Stock to such number of shares as shall be sufficient  for such
purpose.

     (5) In case of any  consolidation  or  merger of the  Corporation  with any
other corporation  (other than a wholly-owned  subsidiary of the Corporation) in
which the Corporation is not the surviving  corporation,  or in case of any sale
or transfer of all or substantially all of the assets of the Corporation,  or in
the case of any share exchange  pursuant to which all of the outstanding  shares
of Common Stock are converted into other securities or property, the Corporation
shall make appropriate  provision or cause  appropriate  provision to be made so
that  each  holder  of  shares of  Series B  Convertible  Preferred  Stock  then
outstanding  shall have the right  thereafter to convert such shares of Series B
Convertible  Preferred  Stock  into  the  kind of  shares  of  stock  and  other
securities  and  property  receivable  upon such  consolidation,  merger,  sale,
transfer,  or share  exchange  by a holder of shares of Common  Stock into which
such shares of Series B Convertible  Preferred  Stock could have been  converted
immediately  prior to the effective date of such  consolidation,  merger,  sale,
transfer, or share exchange and on a basis which preserves the economic benefits
of the  conversion  rights of the  holders  of  shares  of Series B  Convertible
Preferred Stock on a basis as nearly as practical as such rights exist hereunder
prior thereto.  If, in connection  with any such  consolidation,  merger,  sale,
transfer,  or share exchange,  each holder of shares of Common Stock is entitled
to elect to receive  securities,  cash, or other assets upon  completion of such
transaction,  the  Corporation  shall  provide or cause to be  provided  to each
holder  of  Series  B  Convertible  Preferred  Stock  the  right  to  elect  the
securities,  cash, or other assets into which the Series B Convertible Preferred
Stock held by such holder  shall be  convertible  after  completion  of any such
transaction on the same terms and subject to the same  conditions  applicable to
holders of the Common Stock (including,  without limitation, notice of the right
to elect,  limitations  on the period in which such election  shall be made, and
the effect of failing to  exercise  the  election).  The  Corporation  shall not
effect any such  transaction  unless the  provisions of this paragraph have been
complied  with.  The  above  provisions  shall  similarly  apply  to  successive
consolidations, mergers, sales, transfers, or share exchanges.

     (6) If a holder shall have given a Conversion Notice for shares of Series B
Convertible  Preferred  Stock,  the Corporation  shall issue and deliver to such
person  certificates  for the Common Stock issuable upon such conversion  within
three  Trading  Days  after  such  Conversion  Notice  is given  and the  person
converting  shall be deemed to be the  holder  of  record  of the  Common  Stock
issuable  upon such  conversion,  and all  rights  with  respect  to the  shares
surrendered  shall  forthwith  terminate  except the right to receive the Common
Stock or other securities, cash, or other assets as herein provided. If a holder
shall have given a  Conversion  Notice as  provided  herein,  the  Corporation's
obligation  to issue and  deliver  the  certificates  for Common  Stock shall be
absolute  and  unconditional,  irrespective  of any  action or  inaction  by the
converting holder to enforce the same, any waiver or consent with respect to any
provision thereof, the recovery of any judgment against any person or any action
to  enforce  the same,  any  failure  or delay in the  enforcement  of any other
obligation  of the  Corporation  to such  holder,  or any setoff,  counterclaim,

<PAGE>

recoupment,  limitation or termination,  or any breach or alleged breach by such
holder or any other person of any obligation to the Corporation or any violation
or alleged violation of law by such holder or any other person, and irrespective
of any other  circumstance  which might  otherwise  limit such obligation of the
Corporation to the holder in connection with such conversion. If the Corporation
fails to issue and deliver the  certificates  for the Common Stock to the holder
converting shares of Series B Convertible  Preferred Stock pursuant to the first
sentence of this  paragraph  within  three  Trading  Days after such  Conversion
Notice is given,  in addition to any other  liabilities the Corporation may have
hereunder and under  applicable law (1) the  Corporation  shall pay or reimburse
such  holder  on  demand  for  all  out-of-pocket  expenses  including,  without
limitation,  reasonable  fees and  expenses  of legal  counsel  incurred by such
holder as a result of such failure, (2) for each Trading Day thereafter on which
the  Corporation so fails to deliver such  certificates,  the  Conversion  Price
applicable to such conversion shall be reduced by an amount equal to one percent
of the amount that the Conversion  Price would otherwise be, and (3) such holder
may by written notice (which may be given by mail, courier,  personal service or
telephone line facsimile  transmission)  or oral notice  (promptly  confirmed in
writing) given at any time prior to delivery to such holder of the  certificates
for the shares of Common Stock issuable upon such conversion of shares of Series
B Convertible  Preferred Stock,  rescind such conversion,  whereupon such holder
shall have the right to convert  such shares of Series B  Convertible  Preferred
Stock thereafter in accordance herewith.

     (7) No fractional shares of Common Stock shall be issued upon conversion of
Series B Convertible  Preferred Stock but, in lieu of any fraction of a share of
Common Stock to purchase fractional shares of Common Stock which would otherwise
be issuable in respect of the aggregate  number of such shares  surrendered  for
conversion at one time by the same holder,  the Corporation shall pay in cash an
amount equal to the product of (i) the arithmetic average of the Market Price of
one share of Common  Stock on the three  consecutive  Trading Days ending on the
Trading Day  immediately  preceding the Conversion Date times (ii) such fraction
of a share.

     (8) The Conversion Amount shall be adjusted from time to time under certain
circumstances, subject to the provisions of Section 10(b)(1), as follows:

     (i) In case the  Corporation  shall issue  rights or warrants on a pro rata
basis to all holders of the Common Stock entitling such holders to subscribe for
or purchase  Common  Stock on the record  date  referred to below at a price per
share less than the Current  Price for such record date,  then in each such case
the  Conversion  Amount in effect  on such  record  date  shall be  adjusted  in
accordance with the following formula:

         C1 = C x  O + N
                   ------
                   O + N x P
                       -----
                         M

where

          C1   = the adjusted Conversion Amount

          C    = the current Conversion Amount

          O    = the number of shares of Common Stock  outstanding on the record
               date.
<PAGE>


          N    = the  number  of  additional  shares of  Common  Stock  issuable
               pursuant to the exercise of such rights or warrants.

          P    = the offering  price per share of the  additional  shares (which
               amount  shall  include  amounts  received by the  Corporation  in
               respect  of the  issuance  and the  exercise  of such  rights  or
               warrants).

          M    = the Current Price per share of Common Stock on the record date.

Such adjustment shall become effective immediately after the record date for the
determination  of stockholders  entitled to receive such rights or warrants.  If
any or all such  rights or  warrants  are not so  issued or expire or  terminate
before being exercised, the Conversion Amount then in effect shall be readjusted
appropriately.

     (ii) In case the Corporation shall, by dividend or otherwise, distribute to
all  holders of its  Junior  Stock (as  hereinafter  defined)  evidences  of its
indebtedness  or assets  (including  securities,  but  excluding any warrants or
subscription  rights referred to in  subparagraph  (i) above and any dividend or
distribution paid in cash out of the retained earnings of the Corporation), then
in each such case the  Conversion  Amount  then in effect  shall be  adjusted in
accordance with the formula

         C1 = C x   M
                  -----
                  M - F

where

          C1   = the adjusted Conversion Amount

          C    = the current Conversion Amount

          M    = the Current  Price per share of Common Stock on the record date
               mentioned below.

          F    = the  aggregate  amount of such cash  dividend  and/or  the fair
               market value on the record date of the assets or securities to be
               distributed  divided  by the  number of  shares  of Common  Stock
               outstanding  on the record  date.  The Board of  Directors  shall
               determine such fair market value,  which  determination  shall be
               conclusive.

Such adjustment shall become effective immediately after the record date for the
determination of stockholders entitled to receive such dividend or distribution.
For purposes of this subparagraph  (ii),  "Junior Stock" shall include any class
of capital  stock  ranking  junior as to  dividends or upon  liquidation  to the
Series B Convertible Preferred Stock.

     (iii) All  calculations  hereunder  shall be made to the nearest cent or to
the nearest 1/100 of a share, as the case may be.

     (iv) If at any time as a result of an  adjustment  made pursuant to Section
10(b)(5),  the holder of any Series B  Convertible  Preferred  Stock  thereafter
surrendered for conversion shall become entitled to receive securities, cash, or

<PAGE>

assets  other than  Common  Stock,  the number or amount of such  securities  or
property so receivable upon conversion  shall be subject to adjustment from time
to time in a  manner  and on  terms  nearly  equivalent  as  practicable  to the
provisions  with respect to the Common Stock contained in  subparagraphs  (i) to
(iii) above.

     (9) Except as otherwise provided above in this Section 10, no adjustment in
the  Conversion  Amount  shall be made in  respect of any  conversion  for share
distributions  or  dividends  theretofore  declared  and paid or  payable on the
Common Stock.

     (10) Whenever the  Conversion  Amount is adjusted as herein  provided,  the
Corporation  shall send to each holder and each transfer  agent, if any, for the
Series B  Convertible  Preferred  Stock and the  transfer  agent for the  Common
Stock, a statement  signed by the Chairman of the Board,  the President,  or any
Vice  President of the  Corporation  and by its Treasurer or its Secretary or an
Assistant  Secretary  stating  the  adjusted  Conversion  Amount  determined  as
provided in this  Section 10, and any  adjustment  so  evidenced,  given in good
faith, shall be binding upon all stockholders and upon the Corporation. Whenever
the Conversion  Amount is adjusted,  the Corporation will give notice by mail to
the holders of record of Series B  Convertible  Preferred  Stock,  which  notice
shall be made within 15 days after the  effective  date of such  adjustment  and
shall  state the  adjustment  and the  Conversion  Amount.  Notwithstanding  the
foregoing notice provisions, failure by the Corporation to give such notice or a
defect in such  notice  shall not affect the  binding  nature of such  corporate
action of the Corporation.

     (11)  Whenever  the  Corporation  shall  propose to take any of the actions
specified  in  Section  10(b)(5)  or in  subparagraphs  (i) or (ii)  of  Section
10(b)(8)  which would result in any  adjustment in the  Conversion  Amount under
this Section 10(b),  the Corporation  shall cause a notice to be mailed at least
20 days prior to the date on which the books of the Corporation will close or on
which a record  will be taken for such  action,  to the holders of record of the
outstanding  Series B  Convertible  Preferred  Stock on the date of such notice.
Such notice shall specify the action proposed to be taken by the Corporation and
the date as of which holders of record of the Common Stock shall  participate in
any such actions or be entitled to exchange their Common Stock for securities or
other  property,  as the case may be.  Failure  by the  Corporation  to mail the
notice or any  defect  in such  notice  shall not  affect  the  validity  of the
transaction.

     (c)  Notice to Holder  Prior to  Certain  Actions.  In case on or after the
Issuance Date:

          (i)  the   Corporation   shall   declare  a  dividend  (or  any  other
     distribution)  on its  Common  Stock  (other  than in cash out of  retained
     earnings); or

          (ii) the  Corporation  shall  authorize the granting to the holders of
     its Common  Stock of rights or warrants to  subscribe  for or purchase  any
     share of any class or any other rights or warrants; or

          (iii) the Board of Directors shall authorize any  reclassification  of
     the  Common  Stock  (other  than  a  subdivision   or  combination  of  its
     outstanding Common Stock, or a change in par value, or from par value to no
     par value,  or from no par value to par  value),  or any  consolidation  or
     merger or other business  combination  transaction to which the Corporation

<PAGE>

     is a party and for which approval of any stockholders of the Corporation is
     required, or the sale or transfer of all or substantially all of the assets
     of the Corporation; or

          (iv) there shall be pending the voluntary or involuntary  dissolution,
     liquidation or winding-up of the Corporation;

the Corporation  shall give the Holders as promptly as possible but in any event
at least ten Trading Days prior to the applicable date hereinafter  specified, a
notice  stating (x) the date on which a record is to be taken for the purpose of
such dividend,  distribution or rights or warrants, or, if a record is not to be
taken, the date as of which the holders of Common Stock of record to be entitled
to such dividend,  distribution or rights are to be determined,  or (y) the date
on  which  such   reclassification,   consolidation,   merger,   other  business
combination transaction, sale, transfer, dissolution,  liquidation or winding-up
is  expected  to  become  effective  or  occur,  and the  date as of which it is
expected  that  holders  of Common  Stock of record  who  shall be  entitled  to
exchange their Common Stock for securities or other  property  deliverable  upon
such  reclassification,   consolidation,   merger,  other  business  combination
transaction,  sale,  transfer,  dissolution,  liquidation or winding-up shall be
determined.  Such  notice  shall not  include  any  information  which  would be
material  non-public  information for purposes of the 1934 Act.  Failure to give
such notice, or any defect therein, shall not affect the legality or validity of
such dividend,  distribution,  reclassification,  consolidation,  merger,  sale,
transfer, dissolution, liquidation or winding-up. In the case of any such action
of which the Corporation gives such notice to the Holders or is required to give
such notice to the Holders,  the Holders  shall be entitled to give a Conversion
Notice which is contingent on the completion of such action.

     Section 11. Redemption at Option of Holders.

     (a) Redemption  Right.  If an Optional  Redemption  Event occurs,  then, in
addition  to any  other  right or  remedy  of any  holder  of shares of Series B
Convertible  Preferred  Stock,  each  holder of  shares of Series B  Convertible
Preferred  Stock shall have the right, at such holder's  option,  to require the
Corporation  to redeem  all of such  holder's  shares  of  Series B  Convertible
Preferred Stock, or any portion thereof, on the date which is five Business Days
after the date such holder gives the Corporation an Optional  Redemption  Notice
with  respect to such  Optional  Redemption  Event at any time while any of such
holder's shares of Series B Convertible  Preferred Stock are  outstanding,  at a
price equal to the Optional Redemption Price.

     (b) Notices;  Method of Exercising  Optional Redemption Rights, Etc. (1) On
or before the fifth Business Day after the occurrence of an Optional  Redemption
Event, the Corporation shall give to each holder of outstanding shares of Series
B  Convertible  Preferred  Stock a notice  of the  occurrence  of such  Optional
Redemption  Event and of the  redemption  right set forth  herein  arising  as a
result thereof. Such notice from the Corporation shall set forth:

     (i) the date by which the optional redemption right must be exercised, and

     (ii) a  description  of the  procedure  (set forth  below)  which each such
holder must follow to exercise such holder's optional redemption right.

No failure of the  Corporation to give such notice or defect therein shall limit
the right of any  holder of shares of Series B  Convertible  Preferred  Stock to
exercise the optional redemption right or affect the validity of the proceedings

<PAGE>

for the  redemption  of such holder's  shares of Series B Convertible  Preferred
Stock.

     (2) To exercise its optional  redemption  right, each holder of outstanding
shares of Series B Convertible  Preferred Stock shall deliver to the Corporation
on or before the 30th day after the notice required by Section 11(b)(1) is given
to such holder (or if no such notice has been given by the  Corporation  to such
holder,  within  40 days  after  such  holder  first  learns  of  such  Optional
Redemption Event) an Optional Redemption Notice to the Corporation.  An Optional
Redemption Notice may be revoked by such holder giving such Optional  Redemption
Notice by giving notice of such  revocation to the Corporation at any time prior
to the time the Corporation pays the Optional Redemption Price to such holder.

     (3) If a holder of shares of Series B  Convertible  Preferred  Stock  shall
have given an Optional  Redemption  Notice,  on the date which is five  Business
Days after the date such Optional Redemption Notice is given (or such later date
as such holder surrenders such holder's  certificates for the shares of Series B
Convertible  Preferred Stock to be redeemed) the Corporation  shall make payment
in immediately  available funds of the applicable  Optional  Redemption Price to
such account as specified by such holder in writing to the  Corporation at least
one Business Day prior to the applicable redemption date.

     (4)   Notwithstanding   any  other   provision  of  this   Certificate   of
Designations,  if an Optional  Redemption Event occurs by reason of events which
are not solely within the control of the Corporation, the Corporation shall have
the  right to give a  Control  Notice  to the  holders  of  shares  of  Series B
Convertible  Preferred  Stock at any time after such Optional  Redemption  Event
occurs and prior to the  earlier of (1) the date on which all  holders of shares
of Series B Convertible Preferred Stock who had the right (other than as limited
by this  Section  11(b)(4))  to  require  redemption  of any  shares of Series B
Convertible  Preferred  Stock  by  reason  of the  occurrence  of such  Optional
Redemption  Event no longer  have such right and (2) the  applicable  redemption
date by reason of the earliest Optional Redemption Notice given by any holder of
shares  of Series B  Convertible  Preferred  Stock by  reason  of such  Optional
Redemption  Event.  If the  Corporation  timely gives such Control Notice to the
holders  of shares  of Series B  Convertible  Preferred  Stock,  then in lieu of
payment  of the  Optional  Redemption  Price  by  reason  of any  such  Optional
Redemption  Event  and  commencing  on the  first  date on which  such  Optional
Redemption Event occurs the following  adjustments shall take effect (subject to
the provisions of Section 7(a)(5)(B)):

          (A) In the case of an Optional  Redemption  Event described in clauses
     (1), (2), (3), (4) or (6) of the definition of the term Optional Redemption
     Event,  for so long as such Optional  Redemption  Event continues and for a
     period of 60 days thereafter the Conversion Price will be 70% of the amount
     which the Conversion Price would otherwise be.

          (B) In the case of an Optional  Redemption  Event  described in clause
     (5) of the definition of the term Optional Redemption Event, for so long as
     any shares of Preferred Stock are outstanding the Conversion  Price will be
     70% of the amount which the Conversion Price would otherwise be.

For purposes of the Control Notice given pursuant to this Section  11(b)(4),  an
Optional  Redemption  Event shall be deemed to have occurred by reason of events
which are not solely within the control of the  Corporation  if a requirement of
the  Corporation  to  redeem,  or a right of any  holder  of  shares of Series B

<PAGE>

Convertible  Preferred  Stock to  require  redemption  of,  shares  of  Series B
Convertible  Preferred  Stock by reason thereof would result in the  Corporation
being  required  to  classify  the  Series  B  Convertible  Preferred  Stock  as
redeemable  preferred  stock on a balance sheet of the  Corporation  prepared in
accordance with Generally Accepted  Accounting  Principles and Regulation S-X of
the SEC, and, in the case of an Optional  Redemption  Event  described in clause
(5) of the definition of the term Optional  Redemption  Event,  the Board or the
stockholders  of the  Corporation do not have the right to approve or disapprove
the transactions resulting in such event.

     (c) Other. (1) In connection with a redemption  pursuant to this Section 11
of less than all of the shares of Series B Convertible Preferred Stock evidenced
by a particular certificate, promptly, but in no event later than three Business
Days after  surrender of such  certificate to the  Corporation,  the Corporation
shall issue and deliver to such holder a replacement  certificate for the shares
of Series B Convertible Preferred Stock evidenced by such certificate which have
not been redeemed.

     (2) An Optional  Redemption  Notice given by a holder of shares of Series B
Convertible  Preferred  Stock  shall be deemed for all  purposes to be in proper
form  unless  the  Corporation  notifies  such  holder in writing  within  three
Business Days after such Optional Redemption Notice has been given (which notice
shall specify all defects in such Optional Redemption Notice),  and any Optional
Redemption  Notice  containing any such defect shall nonetheless be effective on
the date given if such holder  promptly  undertakes to correct all such defects.
No such claim of error shall  limit or delay  performance  of the  Corporation's
obligation to redeem all shares of Series B Convertible  Preferred  Stock not in
dispute whether or not such holder makes such undertaking.

     Section 12. Voting Rights; Certain Restrictions.

     (a)  Voting  Rights.  Except  as  otherwise  required  by law or  expressly
provided  herein,  shares of Series B Convertible  Preferred  Stock shall not be
entitled to vote on any matter.

     (b) Certificate of  Incorporation;  Certain Stock.  The affirmative vote or
consent of the Majority Holders,  voting separately as a class, will be required
for (1) any amendment, alteration, or repeal, whether by merger or consolidation
or  otherwise,  of  the  Corporation's   Certificate  of  Incorporation  if  the
amendment,  alteration,  or repeal  materially and adversely affects the powers,
preferences,  or special rights of the Series B Convertible  Preferred Stock, or
(2) the creation and issuance of any Senior Dividend Stock or Senior Liquidation
Stock; provided, however, that any increase in the authorized Preferred Stock of
the  Corporation  or the creation and issuance of any stock which is both Junior
Dividend  Stock  and  Junior  Liquidation  Stock  shall  not be deemed to affect
materially  and adversely  such powers,  preferences,  or special rights and any
such  increase or creation and issuance may be made without any such vote by the
holders of Series B Convertible  Preferred Stock except as otherwise required by
law.

     (c) Repurchases of Series B Convertible  Preferred  Stock.  The Corporation
shall not  repurchase  or otherwise  acquire any shares of Series B  Convertible
Preferred Stock (other than pursuant to Sections 7(a),  9(a), 9(b) or 11) unless
the Corporation  offers to repurchase or otherwise acquire  simultaneously a pro
rata portion of each holder's shares of Series B Convertible Preferred Stock for
cash at the same price per share.

<PAGE>

     (d) Other.  So long as any shares of Series B Convertible  Preferred  Stock
are outstanding:

     (1) Payment of  Obligations.  The Corporation  will pay and discharge,  and
will cause each subsidiary of the Corporation to pay and discharge, when due all
their  respective   obligations  and  liabilities  which  are  material  to  the
Corporation  and  its  subsidiaries  taken  as  a  whole,   including,   without
limitation,  tax  liabilities,  except  where the same may be  contested in good
faith by appropriate proceedings.

     (2) Maintenance of Property;  Insurance. (A) The Corporation will keep, and
will cause each  subsidiary of the  Corporation to keep,  all material  property
useful and  necessary  in its  business  in good  working  order and  condition,
ordinary wear and tear excepted.

     (B) The  Corporation  will maintain,  and will cause each subsidiary of the
Corporation  to  maintain,  with  financially  sound and  responsible  insurance
companies,  insurance  against loss or damage by fire or other casualty and such
other insurance,  including but not limited to, product liability insurance,  in
such amounts and covering such risks as is  reasonably  adequate for the conduct
of their businesses and the value of their properties.

     (3) Conduct of Business and Maintenance of Existence.  The Corporation will
continue,  and will cause each  subsidiary of the  Corporation  to continue,  to
engage in business of the same general type as conducted by the  Corporation and
its operating subsidiaries at the time this Certificate of Designations is filed
with the Secretary of State of the State of Delaware,  and will preserve,  renew
and keep in full  force  and  effect,  and will  cause  each  subsidiary  of the
Corporation  to  preserve,  renew  and  keep in full  force  and  effect,  their
respective corporate existence and their respective material rights,  privileges
and franchises necessary or desirable in the normal conduct of business.

     (4) Compliance with Laws. The Corporation will comply,  and will cause each
subsidiary  of the  Corporation  to comply,  in all material  respects  with all
applicable  laws,  ordinances,   rules,  regulations,   decisions,   orders  and
requirements  of  governmental   authorities  and  courts  (including,   without
limitation,  environmental  laws)  except  (i)  where  compliance  therewith  is
contested in good faith by appropriate  proceedings or (ii) where non-compliance
therewith could not reasonably be expected to have a material  adverse effect on
the business,  condition  (financial  or  otherwise),  operations,  performance,
properties  or  prospects of the  Corporation  and its  subsidiaries  taken as a
whole.

     (5)  Investment  Company  Act.  The  Corporation  will not be or  become an
open-end  investment  trust,  unit investment  trust or face-amount  certificate
company  that  is or is  required  to  be  registered  under  Section  8 of  the
Investment Company Act of 1940, as amended, or any successor provision.

     (6) Transactions  with  Affiliates.  The Corporation will not, and will not
permit any subsidiary of the  Corporation,  directly or  indirectly,  to pay any
funds to or for the account of, make any  investment  (whether by acquisition of
stock or  indebtedness,  by loan,  advance,  transfer of property,  guarantee or
other  agreement  to pay,  purchase or  service,  directly  or  indirectly,  any
indebtedness,  or otherwise) in, lease,  sell,  transfer or otherwise dispose of
any  assets,  tangible  or  intangible,  to, or  participate  in, or effect  any
transaction in connection with, any joint enterprise or other joint  arrangement
with, any Affiliate of the Corporation,  except,  on terms to the Corporation or

<PAGE>

such  subsidiary  no less  favorable  than terms that could be  obtained  by the
Corporation  or such  subsidiary  from a person that is not an  Affiliate of the
Corporation, as determined in good faith by the Board of Directors.

     Section  13.  Outstanding  Shares.  For  purposes  of this  Certificate  of
Designations, all authorized and issued shares of Series B Convertible Preferred
Stock  shall be deemed  outstanding  except (i) from the  applicable  Conversion
Date,  each share of Series B Convertible  Preferred Stock converted into Common
Stock,  unless the  Corporation  shall  default in its  obligation  to issue and
deliver  shares of Common  Stock upon such  conversion  as and when  required by
Section 10; (ii) from the date of registration of transfer, all shares of Series
B  Convertible  Preferred  Stock  held  of  record  by  the  Corporation  or any
subsidiary or Affiliate of the  Corporation  (other than any original  holder of
shares of Series B Convertible  Preferred  Stock) and (iii) from the  applicable
Redemption Date, Share Limitation Redemption Date, Final Redemption Date or date
of  redemption  pursuant  to  Section  11,  all  shares of Series B  Convertible
Preferred Stock which are redeemed or  repurchased,  so long as in each case the
Redemption  Price, the Share Limitation  Redemption  Price, the Final Redemption
Price, the Optional  Redemption Price or other repurchase price, as the case may
be, of such shares of Series B Convertible  Preferred Stock shall have been paid
by the Corporation as and when due hereunder.

     Section 14. Miscellaneous.

     (a) Notices.  Any notices required or permitted to be given under the terms
of this  Certificate of Designations  shall be in writing and shall be delivered
personally  (which shall include  telephone line facsimile  transmission)  or by
courier and shall be deemed given upon  receipt,  if delivered  personally or by
courier (a) in the case of the Corporation, addressed to the Corporation at 3146
Gold Camp Drive, Rancho Cordova,  California 95670,  Attention:  Chief Executive
Officer (telephone line facsimile transmission number (916) 858-8728), or (b) in
the case of any holder of shares of Series B  Convertible  Preferred  Stock,  at
such holder's address or telephone line facsimile  transmission  number shown on
the stock  books  maintained  by the  Corporation  with  respect to the Series B
Convertible  Preferred Stock or such other address as the Corporation shall have
provided  by notice to the holders of shares of Series B  Convertible  Preferred
Stock in  accordance  with  this  Section  or any  holder  of shares of Series B
Convertible Preferred Stock shall have provided to the Corporation in accordance
with this Section.

     (b)  Replacement  of  Certificates.  Upon  receipt  by the  Corporation  of
evidence reasonably  satisfactory to the Corporation of the ownership of and the
loss, theft, destruction or mutilation of any certificate for shares of Series B
Convertible  Preferred Stock and (1) in the case of loss,  theft or destruction,
of indemnity from the record holder of the certificate for such shares of Series
B Convertible Preferred Stock reasonably satisfactory in form to the Corporation
(and without the  requirement to post any bond or other  security) or (2) in the
case of mutilation,  upon surrender and cancellation of the certificate for such
shares of Series B Convertible Preferred Stock, the Corporation will execute and
deliver to such holder a new certificate for such shares of Series B Convertible
Preferred Stock without charge to such holder.

     (c) Overdue Amounts. Except as otherwise specifically provided in Section 5
with  respect to  dividends  in arrears  on the Series B  Convertible  Preferred
Stock,  whenever  any  amount  which is due to any  holder of shares of Series B
Convertible  Preferred  Stock is not paid to such holder  when due,  such amount
shall bear interest at the rate of 14% per annum (or such other rate as shall be
the maximum rate allowable by applicable law) until paid in full.


<PAGE>


                  IN  WITNESS  WHEREOF,  ThermoGenesis  Corp.  has  caused  this
Certificate  of  Designations  to be  signed  by , its , as of the  ____  day of
December, 1999.

                                                          THERMOGENESIS CORP.



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







THE SECURITIES  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN REGISTERED UNDER
THE  SECURITIES ACT OF 1933, AS AMENDED.  THE SECURITIES  HAVE BEEN ACQUIRED FOR
INVESTMENT  AND MAY NOT BE RESOLD,  TRANSFERRED OR ASSIGNED IN THE ABSENCE OF AN
EFFECTIVE  REGISTRATION STATEMENT FOR THE SECURITIES UNDER THE SECURITIES ACT OF
1933,  AS AMENDED,  OR AN OPINION OF COUNSEL THAT  REGISTRATION  IS NOT REQUIRED
UNDER SAID ACT.

                                        Right to  Purchase          Shares  of
                                        Common Stock of ThermoGenesis Corp.


                               THERMOGENESIS CORP.

                          Common Stock Purchase Warrant
No. W-

                  THERMOGENESIS  CORP., a Delaware  corporation (the "Company"),
hereby  certifies  that,  for value  received,  [NAME OF HOLDER]  or  registered
assigns (the  "Holder"),  is entitled,  subject to the terms set forth below, to
purchase  from the  Company  at any  time or from  time to time  after  the date
hereof,  and before 5:00 p.m., New York City time, on the Expiration  Date (such
capitalized term and all other capitalized terms used herein having the meanings
provided  herein),  fully  paid and  nonassessable  shares of Common  Stock at a
purchase price per share equal to the Purchase Price.  The number of such shares
of Common Stock and the Purchase  Price are subject to adjustment as provided in
this Warrant.

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

                  "Common Stock" includes the Company's Common Stock,  $.001 par
         value  per  share,  as  authorized  on the date  hereof,  and any other
         securities into which or for which the Common Stock may be converted or
         exchanged  pursuant  to a  plan  of  recapitalization,  reorganization,
         merger, sale of assets or otherwise.

                  "Company"  shall  include   ThermoGenesis  Corp.,  a  Delaware
         corporation,  and any  corporation  that shall succeed to or assume the
         obligations of  ThermoGenesis  Corp.  hereunder in accordance  with the
         terms hereof.

                  "Expiration Date" means December 22, 2004.

                  "Issuance Date" means the first date of original issuance of
          this Warrant.

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

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

                  "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 at any time shall be entitled
         to receive, or shall have received, on the exercise of this 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

<PAGE>

         Common Stock or Other Securities pursuant to Section 4.

                  "Purchase  Price" shall mean  $2.72628  per share,  subject to
         adjustment as provided in this Warrant.

                  "Registration  Rights Agreement" means the Registration Rights
         Agreement, dated as of December 22, 1999 by and between the Company and
         the original  Holder of this  Warrant,  as amended from time to time in
         accordance with its terms.

                  "Subscription  Agreement"  means the  Subscription  Agreement,
         dated as of  December  22,  1999,  by and  between  the Company and the
         original  Holder  of this  Warrant,  as  amended  from  time to time in
         accordance with its terms.

                  "Trading  Day" means a day on which the  principal  securities
         market for the Common Stock is open for general trading of securities.

                  1.       Exercise of Warrant.

                  1.1  Exercise.  (a) Subject to the  limitation  on exercise in
Section 1.1(b), this Warrant may be exercised by the Holder hereof in full or in
part at any time or from time to time during the  exercise  period  specified in
the first  paragraph  hereof  until the  Expiration  Date by  surrender  of this
Warrant and the subscription  form annexed hereto (duly executed by the Holder),
to the Company's  transfer agent and registrar for the Common Stock, with a copy
to the Company,  and by making payment, in cash or by certified or official bank
check payable to the order of the Company, in the amount obtained by multiplying
(a) the  number  of  shares  of Common  Stock  designated  by the  Holder in the
subscription  form by (b) the  Purchase  Price  then in effect.  On any  partial
exercise  the Company 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 the Holder  (upon  payment by the Holder of any  applicable
transfer  taxes) may request,  providing  in the  aggregate on the face or faces
thereof for the  purchase of the number of shares of Common Stock for which such
Warrant or Warrants may still be exercised.

                  (b) Notwithstanding any other provision of this Warrant, in no
event shall the Holder be entitled at any time to purchase a number of shares of
Common Stock on exercise of this Warrant in excess of that number of shares upon
purchase  of  which  the  sum of (1)  the  number  of  shares  of  Common  Stock
beneficially  owned by the Holder and all persons whose beneficial  ownership of
shares  of  Common  Stock  would  be  aggregated  with the  Holder's  beneficial
ownership of shares of Common  Stock for  purposes of Section  13(d) of the 1934
Act and Regulation 13D-G thereunder,  (each such person other than the Holder an
"Aggregated  Person" and all such persons  other than the Holder,  collectively,
the "Aggregated Persons") (other than shares of Common Stock deemed beneficially
owned  through the  ownership  by the Holder and all  Aggregated  Persons of the
Holder  of the  unexercised  portion  of this  Warrant  and the  unexercised  or
unconverted  portion of any other security of the Company which contains similar
provisions)  and (2) the number of shares of Common Stock issuable upon exercise
of the portion of this Warrant with respect to which the  determination  in this
sentence is being made,  would result in beneficial  ownership by the Holder and
all Aggregated Persons of the Holder of more than 4.9% of the outstanding shares
of Common Stock. For purposes of the immediately preceding sentence,  beneficial
ownership  shall be determined in accordance  with Section 13(d) of the 1934 Act

<PAGE>

and Regulation 13D-G thereunder,  except as otherwise  provided in clause (1) of
the immediately preceding sentence.

                  1.2 Net  Issuance.  Notwithstanding  anything to the  contrary
contained in Section 1.1, 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,  upon surrender of
this Warrant to the Company's  transfer agent and registrar for the Common Stock
together  with the  subscription  form  annexed  hereto  (duly  executed  by the
Holder), 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  current  fair  market  value of one share of Common  Stock
               calculated as of the last Trading Day  immediately  preceding the
               exercise of this Warrant

          B    = the Purchase Price

                  As used  herein,  current fair market value of Common Stock as
of a specified  date shall mean with  respect to each share of Common  Stock the
closing sale price of the Common  Stock on the  principal  securities  market on
which the Common Stock may at the time be listed or, if there have been no sales
on any such  exchange  on such day,  the  average of the  highest bid and lowest
asked prices on the principal  securities  market at the end of such day, or, if
on such day the Common Stock is not so listed, the average of the representative
bid and asked prices quoted in the Nasdaq System as of 4:00 p.m.,  New York City
time,  or, if on such day the Common  Stock is not quoted in the Nasdaq  System,
the  average  of the  highest  bid and  lowest  asked  price  on such day in the
domestic  over-the-counter  market as reported by the National Quotation Bureau,
Incorporated,  or any similar successor organization, in each such case averaged
over a period of five consecutive Trading Days consisting of the day as of which
the current fair market value of a share of Common Stock is being determined (or
if such day is not a Trading Day, the Trading Day next  preceding  such day) and
the four  consecutive  Trading  Days prior to such day. If on the date for which
current fair market value is to be determined  the Common Stock is not listed on
any securities  exchange or quoted in the Nasdaq System or the  over-the-counter
market, the current fair market value of Common Stock shall be the highest price
per share  which the  Company  could  then  obtain  from a willing  buyer (not a
current  employee or  director)  for shares of Common Stock sold by the Company,
from authorized but unissued shares, as determined in good faith by the Board of
Directors  of the  Company,  unless  prior to such date the  Company  has become
subject to a merger,  acquisition or other  consolidation  pursuant to which the
Company is not the surviving  party, in which case the current fair market value
of the Common  Stock shall be deemed to be the value  received by the holders of
the  Company's  Common Stock for each share  thereof  pursuant to the  Company's
acquisition.


<PAGE>

                  2. Delivery of Stock Certificates,  etc., on Exercise. As soon
as practicable after the exercise of this Warrant, and in any event within three
Trading Days thereafter, the Company at its expense (including the payment by it
of any  applicable  issue or stamp taxes) will cause to be issued in the name of
and delivered to the Holder hereof, or as the Holder (upon payment by the Holder
of any applicable  transfer taxes) may direct, a certificate or certificates for
the  number of fully  paid and  nonassessable  shares of Common  Stock (or Other
Securities)  to which the Holder  shall be  entitled on such  exercise,  in such
denominations as may be requested by the Holder, plus, in lieu of any fractional
share to which the  Holder  would  otherwise  be  entitled,  cash  equal to such
fraction  multiplied  by the then current fair market  value (as  determined  in
accordance with subsection 1.2) of one full share, together with any other stock
or other securities and property (including cash, where applicable) to which the
Holder is entitled upon such exercise  pursuant to Section 1 or otherwise.  Upon
exercise of this Warrant as provided herein,  the Company's  obligation to issue
and  deliver  the   certificates   for  Common   Stock  shall  be  absolute  and
unconditional,  irrespective  of the  absence  of any  action  by the  Holder to
enforce the same,  any waiver or consent with respect to any provision  thereof,
the  recovery  of any  judgment  against any person or any action to enforce the
same,  any failure or delay in the  enforcement  of any other  obligation of the
Company to the Holder, or any setoff,  counterclaim,  recoupment,  limitation or
termination,  or any breach or alleged  breach by the Holder or any other person
of any obligation to the Company,  and  irrespective  of any other  circumstance
which  might  otherwise  limit such  obligation  of the Company to the Holder in
connection  with such  exercise.  If the Company  fails to issue and deliver the
certificates  for the Common Stock to the Holder  pursuant to the first sentence
of this  paragraph  as and when  required  to do so,  in  addition  to any other
liabilities the Company may have hereunder and under applicable law, the Company
shall pay or  reimburse  the  Holder on demand  for all  out-of-pocket  expenses
including,  without  limitation,  reasonable  fees and expenses of legal counsel
incurred by the Holder as a result of such failure.

                  3.  Adjustment for Dividends in Other Stock,  Property,  etc.;
Reclassification,  etc.  In case at any  time or  from  time to time  after  the
Issuance Date, all 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) any cash (excluding  cash dividends  payable solely out of
         earnings or earned surplus of the Company), or

                  (c) 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 are provided
for in Section 5), then and in each such case the Holder, on the exercise hereof
as  provided  in Section 1, shall be entitled to receive the amount of stock and
other  securities  and  property  (including  cash in the cases  referred  to in
subdivisions  (b) and (c) of this  Section 3) which the Holder would hold on the
date of such  exercise if on the date  thereof the Holder had been the holder of


<PAGE>

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  hereof 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 case
referred to in  subdivisions  (b) and (c) of this Section 3)  receivable  by the
Holder as aforesaid during such period,  giving effect to all adjustments called
for during such period by Section 4. Notwithstanding  anything in this Section 3
to the contrary,  no  adjustments  pursuant to this Section 3 shall  actually be
made until the cumulative effect of the adjustments called for by this Section 3
since the date of the last  adjustment  actually made would change the amount of
stock or other  securities and property which the Holder would hold by more than
1%.

                  4. Exercise upon Reorganization,  Consolidation,  Merger, etc.
In case at any time or from time to time after the  Issuance  Date,  the Company
shall (a) effect a reorganization,  (b) consolidate with or merge into any other
person,  (c)  effect  an  exchange  of  outstanding  shares of the  Company  for
securities of any other person or (d) transfer all or  substantially  all of its
properties  or  assets  to any  other  person  under  any  plan  or  arrangement
contemplating  the  dissolution  of the Company,  then,  in each such case, as a
condition of such reorganization, consolidation, merger, share exchange, sale or
conveyance,  (i) the Company shall give at least 30 days notice to the Holder of
such  pending  transaction  whereby the Holder  shall have the right to exercise
this Warrant  prior to any such  reorganization,  consolidation,  merger,  share
exchange,  sale or  conveyance  and (ii) if the Holder does not so exercise this
Warrant in full, the Company shall cause effective provisions to be made so that
the Holder shall have the right thereafter,  by exercising this Warrant (in lieu
of the shares of Common Stock of the Company  purchasable  and  receivable  upon
exercise of the rights represented hereby immediately prior to such transaction)
to  purchase  the kind and  amount of shares of stock and other  securities  and
property  (including cash) receivable upon such  reorganization,  consolidation,
merger,  share exchange,  sale or conveyance by a holder of the number of shares
of Common  Stock that might have been  received  upon  exercise of this  Warrant
immediately prior to such reorganization, consolidation, merger, share exchange,
sale or conveyance.  Any exercise of this Warrant  pursuant to notice under this
Section  shall  be  conditioned   upon  the  closing  of  such   reorganization,
consolidation, merger, sale or conveyance which is the subject of the notice and
the  exercise  of this  Warrant  shall  not be  deemed  to have  occurred  until
immediately prior to the closing of such transaction.

                  5.  Adjustment  for  Extraordinary  Events.  In the event that
after the Issuance Date the Company shall (i) issue additional  shares of Common
Stock as a dividend or other  distribution  on  outstanding  Common Stock,  (ii)
subdivide or reclassify its outstanding shares of Common Stock, or (iii) combine
its outstanding shares of Common Stock into a smaller number of shares of Common
Stock, then, in each such event, the Purchase Price shall,  simultaneously  with
the happening of such event,  be adjusted by  multiplying  the Purchase Price in
effect  immediately  prior to such event by a fraction,  the  numerator of which
shall be the number of shares of Common Stock  outstanding  immediately prior to
such event and the  denominator of which shall be the number of shares of Common
Stock  outstanding  immediately  after such  event,  and the product so obtained
shall thereafter be the Purchase Price then in effect. The Purchase 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 5. The Holder 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 be  issuable  on such  exercise
immediately  prior to such  issuance by a fraction of which (i) the numerator is
the Purchase  Price in effect  immediately  prior to such  issuance and (ii) the
denominator is the Purchase Price in effect on the date of such exercise.

<PAGE>

                  6. Further  Assurances.  The Company will take all action that
may be  necessary  or  appropriate  in order that the  Company  may  validly and
legally issue fully paid and nonassessable shares of stock, free from all taxes,
liens and charges with respect to the issue  thereof,  on the exercise of all or
any portion of this Warrant from time to time outstanding.

                  7.       Notices of Record Date, etc.  In the event of

                  (a) any taking by the  Company  of a record of the  holders of
         any class of  securities  for the  purpose of  determining  the holders
         thereof who are  entitled to receive any  dividend  on, or any right to
         subscribe for, purchase or otherwise acquire any shares of stock of any
         class or any other  securities  or  property,  or to receive  any other
         right, or

                  (b)  any   capital   reorganization   of  the   Company,   any
         reclassification  or  recapitalization  of  the  capital  stock  of the
         Company or any  transfer of all or  substantially  all of the assets of
         the Company to or  consolidation  or merger of the Company with or into
         any other person (other than a wholly-owned subsidiary of the Company),
         or

                  (c)    any voluntary or involuntary dissolution, liquidation
          or winding-up of the Company,

then and in each such event the  Company  will mail or cause to be mailed to the
Holder, at least ten days prior to such record date, a notice specifying (i) the
date on which any such record is to be taken for the  purpose of such  dividend,
distribution  or right,  and stating the amount and character of such  dividend,
distribution  or  right,  (ii)  the  date  on  which  any  such  reorganization,
reclassification,    recapitalization,    transfer,    consolidation,    merger,
dissolution, liquidation or winding-up is to take place, and the time, if any is
to be fixed,  as of which  the  holders  of  record  of  Common  Stock (or Other
Securities) shall be entitled to exchange their shares of Common Stock (or Other
Securities) for securities or other property deliverable on such reorganization,
reclassification,    recapitalization,    transfer,    consolidation,    merger,
dissolution,  liquidation or  winding-up,  and (iii) the amount and character of
any stock or other  securities,  or  rights or  options  with  respect  thereto,
proposed to be issued or granted,  the date of such proposed  issue or grant and
the  persons or class of persons to whom such  proposed  issue or grant is to be
offered or made. Such notice shall also state that the action in question or the
record date is subject to the  effectiveness  of a registration  statement under
the 1933 Act, or a favorable vote of  stockholders  if either is required.  Such
notice  shall be mailed at least ten days  prior to the date  specified  in such
notice on which any such action is to be taken or the record date,  whichever is
earlier.

                  8.  Reservation  of  Stock,  etc.,  Issuable  on  Exercise  of
Warrants.  The Company will at all times  reserve and keep  available out of its
authorized  but  unissued  shares of  capital  stock,  solely for  issuance  and
delivery  on the  exercise of this  Warrant,  a  sufficient  number of shares of
Common Stock (or Other  Securities)  to effect the full exercise of this Warrant
and the exercise, conversion or exchange of any other warrant or security of the
Company  exercisable  for,  convertible  into,  exchangeable  for  or  otherwise
entitling  the holder to acquire  shares of Common Stock (or Other  Securities),
and if at any time the number of authorized but unissued  shares of Common Stock
(or  Other  Securities)  shall  not  be  sufficient  to  effect  such  exercise,
conversion  or exchange,  the Company shall take such action as may be necessary
to  increase  its  authorized  but  unissued  shares of  Common  Stock (or Other
Securities) to such number as shall be sufficient for such purposes.

<PAGE>

                  9.  Transfer  of  Warrant.  This  Warrant  shall  inure to the
benefit of the  successors  to and assigns of the Holder.  This  Warrant and all
rights  hereunder,  in whole or in part, are registrable at the office or agency
of the Company  referred to below by the Holder  hereof in person or by his duly
authorized attorney, upon surrender of this Warrant properly endorsed.

                  10. Register of Warrants.  The Company shall maintain,  at the
principal  office of the Company (or such other  office as it may  designate  by
notice to the Holder  hereof),  a register in which the Company shall record the
name and address of the person in whose name this  Warrant has been  issued,  as
well as the name and address of each  successor and prior owner of such Warrant.
The Company  shall be entitled to treat the person in whose name this Warrant is
so registered as the sole and absolute owner of this Warrant for all purposes.

                  11. Exchange of Warrant.  This Warrant is  exchangeable,  upon
the surrender hereof by the Holder hereof at the office or agency of the Company
referred  to in  Section  10,  for  one or  more  new  Warrants  of  like  tenor
representing in the aggregate the right to subscribe for and purchase the number
of shares of Common Stock which may be subscribed  for and purchased  hereunder,
each of such new Warrants to represent  the right to subscribe  for and purchase
such number of shares as shall be  designated  by said Holder hereof at the time
of such surrender.

                  12. 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 this Warrant,  the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

                  13.  Warrant  Agent.  In  accordance  with the Transfer  Agent
Agreement,  dated as of December  22, 1999,  by and among the Company,  American
Securities  Transfer  & Trust,  Inc.,  as  Transfer  Agent  and  Registrar  (the
"Transfer Agent"),  and the original Holder of this Warrant and the other common
stock purchase  warrants of like tenor issued by the Company in connection  with
the issuance of this Warrant,  the Company has  appointed the Transfer  Agent as
the  exercise  agent for  purposes of issuing  shares of Common  Stock (or Other
Securities)  on the exercise of this Warrant  pursuant to Section 1. The Company
may,  by notice to the Holder,  appoint an agent  having an office in the United
States of America for the purpose of exchanging this Warrant pursuant to Section
11 and  replacing  this  Warrant  pursuant  to  Section  12,  or  either  of the
foregoing, and thereafter any such exchange or replacement,  as the case may be,
shall be made at such office by such agent.

                  14. Remedies.  The Company stipulates that the remedies at law
of the Holder in the event of any default or  threatened  default by the Company
in the  performance  of or compliance  with any of the terms of this Warrant are
not and will not be adequate,  and that such terms may be specifically  enforced
by a decree for the specific performance of any agreement contained herein or by
an injunction against a violation of any of the terms hereof or otherwise.

                  15. No Rights or Liabilities  as a  Stockholder.  This Warrant
shall not entitle the Holder  hereof to any voting  rights or other  rights as a
stockholder  of the Company.  No provision  of this  Warrant,  in the absence of

<PAGE>

affirmative  action by the Holder hereof to purchase  Common Stock,  and no mere
enumeration herein of the rights or privileges of the Holder hereof,  shall give
rise to any  liability of the Holder for the Purchase  Price or as a stockholder
of the  Company,  whether  such  liability  is  asserted  by the  Company  or by
creditors of the Company.

                  16. Notices,  etc. All notices and other  communications  from
the  Company  to the  registered  Holder  or from the  registered  Holder to the
Company  shall be delivered  personally  (which  shall  include  telephone  line
facsimile transmission with answer back confirmation) or by courier and shall be
effective upon receipt, addressed to each party at the address or telephone line
facsimile  transmission  number  for each  party set  forth in the  Subscription
Agreement or at such other  address or  telephone  line  facsimile  transmission
number as a party shall have provided to the other party in accordance with this
provision.

                  17. Transfer Restrictions.  By acceptance of this Warrant, the
Holder  represents  to the Company that this  Warrant is being  acquired for the
Holder's own account and for the purpose of  investment  and not with a view to,
or for sale in connection with, the distribution  thereof,  nor with any present
intention of  distributing  or selling this Warrant or the Common Stock issuable
upon  exercise of this  Warrant.  The Holder  acknowledges  and agrees that this
Warrant and, except as otherwise provided in the Registration  Rights Agreement,
the shares of Common Stock  issuable upon exercise of this Warrant (if any) have
not been (and at the time of  acquisition  by the Holder,  will not have been or
will not be),  registered under the 1933 Act or under the securities laws of any
state,  in reliance  upon certain  exemptive  provisions of such  statutes.  The
Holder further recognizes and acknowledges that because this Warrant and, except
as provided in the Registration Rights Agreement, the Common Stock issuable upon
exercise of this Warrant (if any) are unregistered, they may not be eligible for
resale,  and  may  only  be  resold  in  the  future  pursuant  to an  effective
registration  statement under the 1933 Act and any applicable  state  securities
laws,  or pursuant to a valid  exemption  from such  registration  requirements.
Unless the shares of Common Stock  issuable  upon  exercise of this Warrant have
theretofore  been  registered  for resale  under the 1933 Act,  the  Company may
require,  as a condition  to the  issuance of Common  Stock upon the exercise of
this  Warrant  (i) in the case of an  exercise in  accordance  with  Section 1.1
hereof,   a   confirmation   as  of  the  date  of  exercise  of  the   Holder's
representations  pursuant to this Section 17, or (ii) in the case of an exercise
in  accordance  with  Section  1.2  hereof,  an opinion  of  counsel  reasonably
satisfactory  to the Company  that the shares of Common  Stock to be issued upon
such exercise may be issued without registration under the 1933 Act.

                  18. Legend. Unless theretofore registered for resale under the
1933 Act, each certificate for shares issued upon exercise of this Warrant shall
bear the following legend:

         The securities represented by this certificate have not been registered
         under the Securities Act of 1933, as amended.  The securities have been
         acquired for investment and may not be resold,  transferred or assigned
         in  the  absence  of  an  effective   registration  statement  for  the
         securities under the Securities Act of 1933, as amended,  or an opinion
         of counsel that registration is not required under said Act.

                  19. Amendment;  Waiver.  This Warrant and any terms 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. Notwithstanding any other provision of this Warrant or
the Subscription  Agreement,  in addition to the requirements of the immediately
preceding  sentence,  any amendment of (x) Section 1.1(b), (y) the definition of

<PAGE>

the term  Aggregated  Person or (z) this sentence shall require  approval by the
affirmative  vote of the  holders of a  majority  of the  outstanding  shares of
Common  Stock,  present  in person or  represented  by proxy at a duly  convened
meeting of  stockholders  of the Company,  and entitled to vote,  or the consent
thereto in writing by holders of a majority of the outstanding  shares of Common
Stock, and the stockholders of the Company are hereby expressly made third party
beneficiaries of this sentence.

                  20.  Miscellaneous.   This  Warrant  shall  be  construed  and
enforced in  accordance  with and governed by the internal  laws of the State of
California. The headings in this Warrant are for purposes of reference only, and
shall not limit or otherwise  affect any of the terms hereof.  The invalidity or
unenforceability  of any provision hereof shall in no way affect the validity or
enforceability of any other provision.


<PAGE>


                  IN WITNESS WHEREOF,  the Company has caused this Warrant to be
executed on its behalf by one of its officers thereunto duly authorized.

Dated:  December __, 1999                                 THERMOGENESIS CORP.



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



<PAGE>


                              FORM OF SUBSCRIPTION

                               THERMOGENESIS CORP.

                   (To be signed only on exercise of Warrant)

TO:  American Securities Transfer & Trust, Inc.,  CC: ThermoGenesis Corp.
      as Exercise Agent                               3146 Gold Camp Drive
     12039 West Alameda Parkway                       Rancho Cordova, California
     Suite Z-2                                        95670
     Lakewood, Colorado  80228

         1. The undersigned  Holder of the attached  original,  executed Warrant
hereby elects to exercise its purchase  right under such Warrant with respect to
______________   shares  of  Common  Stock,  as  defined  in  the  Warrant,   of
ThermoGenesis Corp., a Delaware corporation (the "Company").

         2. The undersigned Holder (check one):

     o            (a) elects to pay the aggregate purchase price for such shares
                  of Common Stock (the "Exercise Shares") (i) by lawful money of
                  the United  States or the enclosed  certified or official bank
                  check  payable  in United  States  dollars to the order of the
                  Company  in the  amount  of  $___________,  or  (ii)  by  wire
                  transfer of United  States funds to the account of the Company
                  in the amount of  $____________,  which transfer has been made
                  before or  simultaneously  with the  delivery  of this Form of
                  Subscription pursuant to the instructions of the Company;
         or

     o            (b) elects to receive  shares of Common  Stock  having a value
                  equal to the value of the  Warrant  calculated  in  accordance
                  with Section 1.2 of the Warrant.

         3. Please issue a stock  certificate or certificates  representing  the
appropriate  number of shares of Common Stock in the name of the  undersigned or
in such other name as is specified below:

                  Name:    _________________

                  Address:   _________________

                             _________________

Dated: ____________ ___, _______
                                        ---------------------------------------
                                        (Signature  must  conform to name of
                                         Holder as  specified on the face of the
                                         Warrant)


(Address)




                         REGISTRATION RIGHTS AGREEMENT

               THIS REGISTRATION RIGHTS AGREEMENT, dated as of December 22, 1999
(this  "Agreement"),  is made by and  between  THERMOGENESIS  CORP.,  a Delaware
corporation (the  "Company"),  and the person named on the signature page hereto
(the "Initial Investor").

                                     W I T N E S S E T H:

               WHEREAS, in connection with the Subscription Agreement,  dated as
of  December  22,  1999,  between  the Initial  Investor  and the  Company  (the
"Subscription Agreement"), the Company has agreed, upon the terms and subject to
the conditions of the Subscription  Agreement,  to issue and sell to the Initial
Investor  shares  (the  "Preferred  Shares") of Series B  Convertible  Preferred
Stock,  $.001 par value (the  "Series B  Preferred  Stock"),  of the  Company as
provided in the Subscription  Agreement,  which Preferred Shares are convertible
into shares (the  "Conversion  Shares")  of Common  Stock,  $.001 par value (the
"Common  Stock"),  of the Company,  and to issue common stock purchase  warrants
(the "Warrants") to purchase shares (the "Warrant Shares") of Common Stock; and

               WHEREAS,  to induce the  Initial  Investor to execute and deliver
the  Subscription   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
"1933 Act"), and applicable state securities laws with respect to the Conversion
Shares and the Warrant 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.

               (a) As used in this Agreement, the following terms shall have the
following meanings:

               "Certificate   of   Designations"   means  the   Certificate   of
Designations  of the  Series B  Convertible  Preferred  Stock  establishing  and
designating  the Series B Preferred  Stock and fixing the rights and preferences
of such series as filed by the Company with the  Secretary of State of the State
of Delaware.

               "Computation  Date" means, if a Registration Event occurs, any of
(1) the date which is 30 days  after  such  Registration  Event  occurs,  if any
Registration  Event is continuing  on such date,  (2) each date which is 30 days
after a Computation Date, if any Registration  Event is continuing on such date,
and (3) the date on which all Registration Events cease to continue.

               "Investor"  or  "Investors"  means the Initial  Investor  and any
transferee  or assignee  who agrees to become  bound by the  provisions  of this
Agreement in accordance with Section 9 hereof.

<PAGE>


               "Majority Holders" means those persons who hold a majority of the
shares of Series B Preferred  Stock which are then  outstanding,  including such
shares  originally  issued pursuant to the Subscription  Agreement and the Other
Subscription Agreement.

               "Nasdaq" means the Nasdaq SmallCap Market.

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

               "register,"   "registered,"   and   "registration"   refer  to  a
registration  effected  by  preparing  and filing a  Registration  Statement  or
Statements  in  compliance  with the 1933 Act and pursuant to Rule 415 under the
1933 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 SEC.

               "Registrable Securities" means the Conversion Shares and the
Warrant Shares.

               "Registration Event" shall mean (1) the Company fails to file the
Registration  Statement which is required to be filed by the Company pursuant to
Section  2(a)  with the SEC  within  30 days  after the  Closing  Date,  (2) the
Registration  Statement covering the Registrable Securities which is required to
be filed by the Company pursuant to the first sentence of Section 2(a) hereof is
not effective  within 120 days after the Closing Date,  (3) the Company fails to
submit a request for  acceleration  of the  effective  date of the  Registration
Statement  in  accordance  with Section  3(a),  (4) the  Registration  Statement
required to be filed by the Company  pursuant to Section  2(a) shall cease to be
available for use by any Investor who is named therein as a selling  stockholder
for any reason (including, without limitation, by reason of an SEC stop order, a
material  misstatement  or  omission  in  such  Registration  Statement  or  the
information  contained in such  Registration  Statement having become outdated),
(5) the  Common  Stock  ceases to be listed  for  trading on any of the New York
Stock Exchange, the American Stock Exchange, Inc., the Nasdaq National Market or
the Nasdaq,  or (6) a holder of shares of Series B Preferred Stock having become
unable to convert  any shares of Series B  Preferred  Stock in  accordance  with
Section 10(a) of the  Certificate of  Designations  (other than by reason of the
4.9%  limitation  on  beneficial  ownership set forth therein or a redemption or
repurchase thereof).

               "Registration  Period"  means the period from the Closing Date to
the earliest of (i) the date which is five years after the SEC  Effective  Date,
(ii) the date on which each Investor may sell all Registrable  Securities  owned
by such  Investor  or which  such  Investor  has any  right to  acquire  without
registration  under the 1933 Act pursuant to subsection (k) of Rule 144, without
restriction on the manner of sale or the volume of securities  which may be sold
in any period and  without the  requirement  for the giving of any notice to, or
the making of any filing with, the SEC and (iii) the date on which the Investors
no  longer  beneficially  own or have  any  right  to  acquire  any  Registrable
Securities.

               "Registration  Statement"  means a registration  statement of the
Company under the 1933 Act, including any amendment thereto.

<PAGE>

               "Rule 144" means Rule 144  promulgated  under the 1933 Act or any
other similar rule or regulation of the SEC that may at any time permit a holder
of any  securities  to sell  securities  of the  Company to the  public  without
registration under the 1933 Act.

               "SEC" means the Securities and Exchange Commission.

               "SEC Effective Date" means the date the Registration Statement is
declared effective by the SEC.

               "SEC Filing  Date" means the date the  Registration  Statement is
first filed with the SEC pursuant to Section 2(a).

               (b) Capitalized  terms defined in the  introductory  paragraph or
the  recitals  to this  Agreement  shall have the  respective  meanings  therein
provided.  Capitalized  terms used herein and not otherwise defined herein shall
have the respective meanings set forth in the Subscription Agreement.

               2.     Registration.

               (a) Mandatory Registration. (1) The Company shall prepare, and on
or prior to the date which is 30 days after the Closing Date,  file with the SEC
a Registration  Statement on Form S-3 which, on the date of filing with the SEC,
covers the resale by the Initial  Investor of a number of shares of Common Stock
at least  equal to the sum of (x) a number of shares  of Common  Stock  equal to
175% of the number of shares of Common Stock  issuable  upon  conversion  of the
Preferred Shares, determined as if the Preferred Shares, together with 24 months
of accrued and unpaid  dividends  thereon,  were  converted in full at the Fixed
Conversion  Price (as defined in the  Certificate  of  Designations)  on the SEC
Filing  Date plus (y) the  number of  Warrant  Shares  (in each case  determined
without  regard to the  limitations  on  beneficial  ownership  contained in the
proviso  to  the  second  sentence  of  Section  10(a)  of  the  Certificate  of
Designations  and Section 1.1(b) of the Warrants).  If at any time the number of
shares of Common Stock  included in the  Registration  Statement  required to be
filed  as  provided  in the  first  sentence  of  this  Section  2(a)  shall  be
insufficient  to cover 125% of the number of shares of Common Stock  issuable on
conversion  in full of the  unconverted  Preferred  Shares  plus the  number  of
Warrant  Shares  issuable  upon  exercise  of  the  unexercised  portion  of the
Warrants,  then  promptly,  but in no  event  later  than  20  days  after  such
insufficiency  shall occur,  the Company  shall file with the SEC an  additional
Registration  Statement on Form S-3 (which shall not constitute a post-effective
amendment to the Registration  Statement filed pursuant to the first sentence of
this Section  2(a)),  covering such number of shares of Common Stock as shall be
sufficient  to permit such  conversion  and  exercise.  For all purposes of this
Agreement  such  additional  Registration  Statement  shall be  deemed to be the
Registration  Statement  required to be filed by the Company pursuant to Section
2(a) of this  Agreement,  and the Company and the Investors  shall have the same
rights and obligations with respect to such additional Registration Statement as
they shall have with respect to the initial  Registration  Statement required to
be  filed  by the  Company  pursuant  to this  Section  2(a).  The  Registration
Statement shall not include securities to be sold for the account of any selling
securityholder  other than the Investors and the investors  contemplated  by the
registration rights agreement entered into by the Company in connection with the
Other Subscription Agreement.

<PAGE>

               (2) Prior to the SEC Effective Date or during any time subsequent
to the SEC Effective Date when the Registration  Statement for any reason is not
available  for  use  by any  Investor  for  the  resale  of  any of  Registrable
Securities,  the Company shall not file any other registration  statement or any
amendment thereto with the SEC under the 1933 Act or request the acceleration of
the effectiveness of any other registration  statement previously filed with the
SEC, other than any registration statement on Form S-4 or Form S-8.

               (b) Certain Offerings. If any offering pursuant to a Registration
Statement  pursuant to Section 2(a) hereof  involves an  underwritten  offering,
Investors who hold a majority in interest of the Registrable  Securities subject
to such  underwritten  offering shall have the right to select one legal counsel
and an investment  banker or bankers and manager or managers to  administer  the
offering,  which  investment  banker or bankers or manager or managers  shall be
reasonably  satisfactory to the Company.  The Investors who hold the Registrable
Securities  to be  included  in such  underwriting  shall  pay all  underwriting
discounts and commissions and other fees and expenses of such investment  banker
or bankers and manager or managers so selected in  accordance  with this Section
2(b)  (other than fees and  expenses  relating to  registration  of  Registrable
Securities  under  federal or state  securities  laws,  which are payable by the
Company  pursuant  to  Section  5  hereof)  with  respect  to their  Registrable
Securities  and the fees and  expenses of such legal  counsel so selected by the
Investors.

               (c) Payments by the Company.  If a Registration  Event occurs, on
each  Computation  Date the  Company  shall pay each  Investor an amount in cash
equal to 1.5% of the aggregate  subscription price paid by such Investor for the
Preferred  Shares  pursuant  to the  Subscription  Agreement  (pro rated for any
period of less than 30 days).  Each such payment  shall be made by wire transfer
in immediately available funds on each Computation Date to such account as shall
be  specified  for such purpose by each  Investor.  Any such amount which is not
paid when due shall  bear  interest  at the rate of 14% per annum (or such other
rate as shall be the maximum  rate  allowable by  applicable  law) until paid in
full. With respect to any Preferred  Shares as to which an Investor  exercises a
right to  require  redemption  by the  Company  and  which are  timely  redeemed
thereafter in  accordance  with the  Certificate  of  Designations  (without the
Company  exercising  its  rights  under  Sections  7(a)(5)  or  11(b)(4)  of the
Certificate of  Designations),  no payments  pursuant to this Section 2(c) shall
accrue and be due for the period  commencing on the date such  Investor  gives a
redemption notice in connection with such exercise.

               (d)  Piggy-Back  Registrations.  If at any time the Company shall
determine to prepare and file with the SEC a Registration  Statement relating to
an offering  for its own account or the account of others  under the 1933 Act of
any of its equity  securities,  other than on Form S-4 or Form S-8 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, the Company shall
send to each Investor who is entitled to registration  rights under this Section
2(d)  written  notice of such  determination  and, if within ten (10) days after
receipt of such notice,  such Investor shall so request in writing,  the Company
shall include in such Registration  Statement all or any part of the Registrable
Securities  such  Investor  requests  to  be  registered,  except  that  if,  in
connection with any underwritten public offering for the account of the Company,

<PAGE>

the managing  underwriter(s)  thereof shall impose a limitation on the number of
shares of Common  Stock  which may be  included  in the  Registration  Statement
because,  in such  underwriter(s)'  judgment,  such  limitation  is necessary to
effect an orderly  public  distribution,  then the Company shall be obligated to
include  in  such  Registration  Statement  only  such  limited  portion  of the
Registrable  Securities  with  respect  to which  such  Investor  has  requested
inclusion hereunder.  Any exclusion of Registrable  Securities shall be made pro
rata  among  the  Investors  seeking  to  include  Registrable  Securities,   in
proportion to the number of Registrable Securities sought to be included by such
Investors; provided, however, that the Company shall not exclude any Registrable
Securities unless the Company has first excluded all outstanding  securities the
holders of which are not entitled by right to inclusion  of  securities  in such
Registration Statement; and provided further, however, that, after giving effect
to the immediately  preceding proviso,  any exclusion of Registrable  Securities
shall be made pro rata with  holders  of other  securities  having  the right to
include such securities in the  Registration  Statement,  based on the number of
securities  for which  registration  is requested  except to the extent such pro
rata  exclusion  of such  other  securities  is  prohibited  under  any  written
agreement  entered into by the Company with the holder of such other  securities
prior to the date of this Agreement,  in which case such other  securities shall
be excluded, if at all, in accordance with the terms of such agreement. No right
to  registration  of  Registrable  Securities  under this  Section 2(d) shall be
construed to limit any  registration  required  under  Section 2(a) hereof.  The
obligations  of the Company  under this  Section 2(d) may be waived by Investors
holding a majority in interest of the  Registrable  Securities  and shall expire
after the Company has afforded  the  opportunity  for the  Investors to exercise
registration  rights under this Section  2(d) for two  registrations;  provided,
however,  that  any  Investor  who  shall  have had any  Registrable  Securities
excluded from any  Registration  Statement in accordance  with this Section 2(d)
shall be entitled to include in an additional  Registration  Statement  filed by
the Company the Registrable  Securities so excluded.  Notwithstanding  any other
provision of this Agreement,  if the Registration Statement required to be filed
pursuant to Section 2(a) of this Agreement shall have been ordered  effective by
the SEC  and  the  Company  shall  have  maintained  the  effectiveness  of such
Registration  Statement as required by this  Agreement  and if the Company shall
otherwise have complied in all material respects with its obligations under this
Agreement,  then the Company shall not be obligated to register any  Registrable
Securities on such Registration Statement referred to in this Section 2(d).

               (e) Eligibility for Form S-3. The Company meets the  requirements
for the use of Form  S-3 for  registration  of the  Registrable  Securities  for
resale by the Investors. The Company shall file all reports required to be filed
by  the  Company  with  the  SEC  in a  timely  manner  so as to  maintain  such
eligibility for the use of Form S-3.

               3.   Obligations   of  the  Company.   In  connection   with  the
registration of the Registrable Securities, the Company shall:

               (a)  prepare  promptly,  and file with the SEC not later  than 30
days after the Closing Date, a Registration Statement with respect to the number
of  Registrable  Securities  provided in Section 2(a), and thereafter to use its
best  efforts to cause  each  Registration  Statement  relating  to  Registrable
Securities to become  effective as soon as possible after such filing,  and keep
the Registration  Statement  effective  pursuant to Rule 415 at all times during
the Registration Period; submit to the SEC, within three Business Days after the

<PAGE>

Company learns that no review of the Registration  Statement will be made by the
staff of the SEC or that the  staff of the SEC has no  further  comments  on the
Registration  Statement,  as the case  may be, a  request  for  acceleration  of
effectiveness of the Registration Statement to a time and date not later than 48
hours  after  the  submission  of such  request;  notify  the  Investors  of the
effectiveness  of the  Registration  Statement  on  the  date  the  Registration
Statement is declared effective; and the Company represents and warrants to, and
covenants  and  agrees  with,  the  Investors  that the  Registration  Statement
(including  any  amendments or supplements  thereto and  prospectuses  contained
therein),  at the time it is first filed with the SEC, at the time it is ordered
effective  by the  SEC  and at all  times  during  which  it is  required  to be
effective  hereunder  (and each such  amendment and supplement at the time it is
filed  with the SEC and at all times  during  which it is  available  for use in
connection  with the offer  and sale of the  Registrable  Securities)  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 1933 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) furnish to each Investor  whose  Registrable  Securities  are
included in the Registration Statement and its legal counsel, (1) promptly after
the same is prepared and publicly distributed, filed with the SEC or received by
the Company,  one copy of the Registration  Statement and any amendment thereto,
each  preliminary  prospectus  and  prospectus  and each amendment or supplement
thereto,  each  letter  written by or on behalf of the Company to the SEC or the
staff of the SEC and each  item of  correspondence  from the SEC or the staff of
the SEC relating to such  Registration  Statement (other than any portion of any
thereof which contains information for which the Company has sought confidential
treatment)  and  (2)  such  number  of  copies  of  a  prospectus,  including  a
preliminary  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;

               (d) use  reasonable  efforts  to (i)  register  and  qualify  the
Registrable   Securities  covered  by  the  Registration  Statement  under  such
securities  or blue sky laws of such  jurisdictions  as the Investors who hold a
majority in interest of the  Registrable  Securities  being  offered  reasonably
request, (ii) prepare and file in those jurisdictions such amendments (including
post-effective   amendments)   and   supplements  to  such   registrations   and
qualifications as may be necessary to maintain the effectiveness  thereof at all
times until the end of the Registration Period, (iii) take such other actions as
may be necessary to maintain such  registrations and qualifications in effect at
all times  during  the  Registration  Period  and (iv)  take all  other  actions
reasonably necessary or advisable to qualify the Registrable Securities for sale

<PAGE>

in such jurisdictions; provided, however, that the Company shall not be required
in connection  therewith or as a condition thereto (I) to qualify to do business
in any jurisdiction  where it would not otherwise be required to qualify but for
this  Section  3(d),  (II) to  subject  itself to general  taxation  in any such
jurisdiction,  (III) to file a general consent to service of process in any such
jurisdiction,  (IV) to provide  any  undertakings  that cause more than  nominal
expense or burden to the Company or (V) to make any change in its Certificate of
Incorporation  or  by-laws,  which in each  case the Board of  Directors  of the
Company  determines to be contrary to the best  interests of the Company and its
stockholders;

               (e) in the  event  that  the  Registrable  Securities  are  being
offered in an  underwritten  offering,  enter into and perform  its  obligations
under an underwriting agreement, in usual and customary form, including, without
limitation,  customary  indemnification and contribution  obligations,  with the
underwriters of such offering;

               (f) as promptly as practicable after becoming aware of such event
or circumstance,  notify each Investor of any event or circumstance 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 to correct such
untrue statement or omission,  file such supplement or amendment with the SEC at
such time as shall permit the Investors to sell Registrable  Securities pursuant
to the Registration  Statement as promptly as practicable,  and deliver a number
of copies of such  supplement or amendment to each Investor as such Investor may
reasonably request;

               (g) as  promptly  as  practicable  after  becoming  aware of such
event, 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 any stop order or other  suspension of  effectiveness  of
the Registration Statement at the earliest possible time;

               (h)  permit  a  single  firm of  counsel  designated  as  selling
stockholders'  counsel by the  Investors  who hold a majority in interest of the
Registrable  Securities  being  sold to review and  comment on the  Registration
Statement and all amendments and supplements thereto a reasonable period of time
prior to their filing with the SEC;

               (i) make generally  available to its security  holders as soon as
practical,  but not later  than  ninety  (90) days after the close of the period
covered thereby, an earnings statement (in form complying with the provisions of
Rule 158 under the 1933 Act) covering a twelve-month  period beginning not later
than the first day of the Company's  fiscal quarter next following the effective
date of the Registration Statement;

               (j) in connection with any underwritten  offering, at the request
of the Investors who hold a majority in interest of the  Registrable  Securities
being sold, furnish on the date that Registrable  Securities are delivered to an
underwriter for sale in connection with the Registration Statement (i) a letter,
dated such date, from the Company's  independent certified public accountants in
form and  substance as is  customarily  given by  independent  certified  public

<PAGE>

accountants to underwriters in an underwritten public offering, addressed to the
underwriters;  and (ii) an opinion,  dated such date, from counsel  representing
the Company for purposes of such Registration  Statement,  in form and substance
as is customarily  given in an underwritten  public  offering,  addressed to the
underwriter(s) and the Investors;

               (k)  make   available  for   inspection  by  any  Investor,   any
underwriter  participating  in any  disposition  pursuant  to  the  Registration
Statement,  and any  attorney,  accountant  or other agent  retained by any such
Investor  or  underwriter  (collectively,   the  "Inspectors"),   all  pertinent
financial and other records, pertinent corporate documents and properties of the
Company  (collectively,  the  "Records"),  as shall be  reasonably  necessary to
enable each Investor to exercise its due diligence responsibility, and cause the
Company's officers,  directors and employees to supply all information which any
Inspector may reasonably  request for purposes of such due diligence;  provided,
however,  that each  Inspector  shall hold in confidence  and shall not make any
disclosure  (except to an Investor) of any Record or other information which the
Company determines in good faith to be confidential,  and of which determination
the  Inspectors  are so notified,  unless (i) the  disclosure of such Records is
necessary  to avoid or correct a  misstatement  or omission in any  Registration
Statement, (ii) the release of such Records is ordered pursuant to a subpoena or
other order from a court or government  body of competent  jurisdiction or (iii)
the information in such Records has been made generally  available to the public
other  than by  disclosure  in  violation  of this or any other  agreement.  The
Company shall not be required to disclose any  confidential  information in such
Records to any Inspector until and unless such Inspector shall have entered into
confidentiality  agreements (in form and substance  satisfactory to the Company)
with the Company with respect thereto, substantially in the form of this Section
3(k). Each Investor agrees that it shall,  upon learning that disclosure of such
Records  is  sought  in  or  by  a  court  or  governmental  body  of  competent
jurisdiction or through other means, give prompt notice to the Company and allow
the Company,  at the Company's own expense,  to undertake  appropriate action to
prevent  disclosure of, or to obtain a protective  order for, the Records deemed
confidential.  The  Company  shall  hold in  confidence  and  shall not make any
disclosure  of  information  concerning  an  Investor  provided  to the  Company
pursuant to Section 4(e) hereof  unless (i)  disclosure of such  information  is
necessary to comply with federal or state  securities  laws, (ii) the disclosure
of such  information is necessary to avoid or correct a misstatement or omission
in any Registration Statement,  (iii) the release of such information is ordered
pursuant  to a  subpoena  or other  order from a court or  governmental  body of
competent  jurisdiction  or  (iv)  such  information  has  been  made  generally
available  to the public  other than by  disclosure  in violation of this or any
other agreement. The Company agrees that it shall, upon learning that disclosure
of such  information  concerning  an  Investor  is  sought  in or by a court  or
governmental body of competent  jurisdiction or through other means, give prompt
notice to such Investor and allow such Investor, at such Investor's own expense,
to  undertake  appropriate  action  to  prevent  disclosure  of,  or to obtain a
protective order for, such information;

               (l)  use its  best  efforts  (i) to  cause  all  the  Registrable
Securities  covered by the Registration  Statement to be listed on the Nasdaq or
such other principal  securities market on which securities of the same class or
series  issued by the Company are then listed or traded or (ii) if securities of
the same class or series as the  Registrable  Securities  are not then listed on

<PAGE>

Nasdaq or any such  other  securities  market,  to cause all of the  Registrable
Securities  covered by the  Registration  Statement to be listed on the New York
Stock Exchange, the American Stock Exchange or the Nasdaq National Market;

               (m) 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;

               (n) cooperate with the Investors who hold Registrable  Securities
being  offered  and  the  managing  underwriter  or  underwriters,  if  any,  to
facilitate the timely  preparation and delivery of certificates (not bearing any
restrictive legends) representing  Registrable Securities to be offered pursuant
to the  Registration  Statement  and  enable  such  certificates  to be in  such
denominations  or amounts,  as the case may be, as the managing  underwriter  or
underwriters,  if any, or the Investors may reasonably request and registered in
such names as the managing underwriter or underwriters, if any, or the Investors
may request;  and,  within three  Business Days after a  Registration  Statement
which  includes  Registrable  Securities  is ordered  effective  by the SEC, the
Company shall deliver to the transfer agent for the Registrable Securities (with
copies to the  Investors  whose  Registrable  Securities  are  included  in such
Registration Statement) an instruction substantially in the form attached hereto
as Exhibit 1 and shall cause legal counsel selected by the Company to deliver to
the Investors an opinion of such counsel in the form attached  hereto as Exhibit
2 (with a copy to the Company's transfer agent);

               (o)  during  the  period the  Company  is  required  to  maintain
effectiveness  of the  Registration  Statement  pursuant  to Section  3(a),  the
Company  shall not bid for or purchase any Common Stock or any right to purchase
Common  Stock or attempt to induce any person to purchase  any such  security or
right if such bid,  purchase or attempt  would in any way limit the right of the
Investors to sell Registrable  Securities by reason of the limitations set forth
in Regulation M under the 1934 Act; and

               (p) take all other reasonable  actions  necessary to expedite and
facilitate  disposition by the Investors 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 five 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 any of such  Investor's
Registrable Securities are eligible for inclusion in the Registration Statement.
If at least  one  Business  Day 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 but shall not

<PAGE>

be relieved of its  obligation  to file a  Registration  Statement  with the SEC
relating to the Registrable Securities of such Non-Responsive  Investor promptly
after such Non-Responsive Investor provides the Requested Information;

               (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;

               (c) In the event Investors  holding a majority in interest of the
Registrable  Securities being registered  determine to engage the services of an
underwriter,  each  Investor  agrees to enter into and perform  such  Investor's
obligations  under an  underwriting  agreement,  in usual  and  customary  form,
including,  without  limitation,   customary  indemnification  and  contribution
obligations,  with the managing underwriter of such offering and take such other
actions as are  reasonably  required  in order to  expedite  or  facilitate  the
disposition of the Registrable Securities, 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;

               (d) 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), 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;

               (e) No Investor may participate in any underwritten  registration
hereunder  unless such Investor (i) agrees to sell such  Investor's  Registrable
Securities on the basis provided in any  underwriting  arrangements  approved by
the Investors entitled  hereunder to approve such  arrangements,  (ii) completes
and executes all questionnaires,  powers of attorney, indemnities,  underwriting
agreements  and  other  documents  reasonably  required  under the terms of such
underwriting  arrangements  and (iii)  agrees  to pay its pro rata  share of all
underwriting discounts and commissions and other fees and expenses of investment
bankers and any manager or managers of such  underwriting  and legal expenses of
the underwriters applicable with respect to its Registrable Securities,  in each
case to the extent  not  payable by the  Company  pursuant  to the terms of this
Agreement; and

               (f) Each Investor agrees to take all reasonable actions necessary
to comply with the prospectus  delivery  requirements of the 1933 Act applicable
to its sales of Registrable Securities.

               5. Expenses of Registration.  All reasonable expenses, other than
underwriting discounts and commissions and other fees and expenses of investment

<PAGE>

bankers  and other than  brokerage  commissions,  incurred  in  connection  with
registrations,   filings  or  qualifications  pursuant  to  Sections  2  and  3,
including,  without  limitation,  all registration,  listing and  qualifications
fees, printers and accounting fees and the fees and disbursements of counsel for
the  Company  and the  Investors  (in  addition  to the  payment of the  Initial
Investor's expenses to the extent provided in the Subscription Agreement), shall
be borne by the Company,  provided,  however,  that the Investors shall bear the
fees  and  out-of-pocket  expenses  of the one  legal  counsel  selected  by the
Investors pursuant to Section 2(b) hereof.

               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 1933
Act or the 1934  Act,  any  underwriter  (as  defined  in the 1933  Act) for the
Investors,  the directors, if any, of such underwriter and the officers, if any,
of such underwriter,  and each person, if any, who controls any such underwriter
within  the  meaning  of the 1933 Act or the 1934  Act  (each,  an  "Indemnified
Person"), against any losses, claims, damages, liabilities or expenses (joint or
several)  incurred  (collectively,  "Claims")  to which  any of them may  become
subject  under the 1933 Act, the 1934 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: (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 any
preliminary  prospectus if used prior to the effective date of such Registration
Statement, or 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 1933 Act, the 1934 Act, any state securities law
or any rule or  regulation  under  the  1933  Act,  the  1934  Act or any  state
securities  law (the matters in the  foregoing  clauses (i) through (iii) being,
collectively,  "Violations").  Subject to the  restrictions set forth in Section
6(d) with respect to the number of legal  counsel,  the Company shall  reimburse
the Investors and the other Indemnified  Persons,  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): (I) shall not 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 any
Indemnified  Person or underwriter for such Indemnified Person expressly for use
in connection with the preparation of the Registration Statement, the prospectus
or any such  amendment  thereof or supplement  thereto,  if such  prospectus was
timely made available by the Company pursuant to Section 3(c) hereof;  (II) with
respect to any preliminary prospectus shall not inure to the benefit of any such
person from whom the person  asserting any such Claim  purchased the Registrable
Securities  that  are the  subject  thereof  (or to the  benefit  of any  person
controlling  such person) if the untrue  statement or omission of material  fact

<PAGE>

contained in the preliminary prospectus was corrected in the prospectus, as then
amended or  supplemented,  if such  prospectus  was timely made available by the
Company  pursuant to Section 3(c)  hereof;  and (III) shall not apply to amounts
paid in settlement of any Claim if such settlement is effected without the prior
written  consent  of the  Company,  which  consent  shall  not  be  unreasonably
withheld. 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) In  connection  with any  Registration  Statement in which an
Investor is  participating,  each such  Investor  agrees to  indemnify  and hold
harmless,  to the same extent and in the same manner set forth in Section  6(a),
the  Company,  each  of its  directors,  each  of its  officers  who  signs  the
Registration Statement, each person, if any, who controls the Company within the
meaning  of the  1933  Act or the  1934  Act,  any  underwriter  and  any  other
stockholder selling securities pursuant to the Registration  Statement or any of
its  directors  or  officers  or any person who  controls  such  stockholder  or
underwriter within the meaning of the 1933 Act or the 1934 Act (collectively and
together with an Indemnified Person, an "Indemnified Party"),  against any Claim
to which any of them may  become  subject,  under the 1933 Act,  the 1934 Act or
otherwise,  insofar as such Claim arises out of or is based upon any  Violation,
in each case to the extent (and only to the extent) that such  Violation  occurs
in reliance upon and in  conformity  with written  information  furnished to the
Company by such Investor  expressly for use in connection with such Registration
Statement;  and such  Investor  will  reimburse  any  legal  or  other  expenses
reasonably incurred by any Indemnified Party in connection with investigating or
defending  any such  Claim;  provided,  however,  that the  indemnity  agreement
contained in this Section 6(b) shall not apply to amounts paid in  settlement of
any Claim if such  settlement is effected  without the prior written  consent of
such  Investor,  which consent  shall not be  unreasonably  withheld;  provided,
further,  however, that the Investor shall be liable under this Section 6(b) for
only  that  amount  of a Claim as does not  exceed  the  amount by which the net
proceeds to such Investor from the sale of  Registrable  Securities  pursuant to
such Registration  Statement exceeds the cost of such Registrable  Securities to
such Investor.  Such indemnity shall remain in full force and effect  regardless
of any  investigation  made by or on behalf of such Indemnified  Party and shall
survive the transfer of the Registrable  Securities by the Investors pursuant to
Section 9.  Notwithstanding  anything  to the  contrary  contained  herein,  the
indemnification  agreement  contained  in this  Section 6(b) with respect to any
preliminary  prospectus shall not inure to the benefit of any Indemnified  Party
if  the  untrue  statement  or  omission  of  material  fact  contained  in  the
preliminary  prospectus  was corrected on a timely basis in the  prospectus,  as
then amended or supplemented.

               (c) The Company  shall be entitled  to receive  indemnities  from
underwriters,  selling brokers,  dealer managers and similar securities industry
professionals participating in any distribution,  to the same extent as provided
above,  with  respect to  information  so  furnished  in writing by such persons
expressly for inclusion in the Registration Statement.

               (d)  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

<PAGE>

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 selected by the  indemnifying  party
but reasonably acceptable to the Indemnified Person or the Indemnified Party, as
the case may be; provided,  however,  that an Indemnified  Person or Indemnified
Party shall have the right to retain its own counsel  with the fees and expenses
to be paid by the indemnifying  party, if, in the reasonable  opinion of counsel
retained by the indemnifying  party, the  representation  by such counsel of the
Indemnified  Person or  Indemnified  Party and the  indemnifying  party would be
inappropriate  due to actual  or  potential  differing  interests  between  such
Indemnified  Person or Indemnified Party and any other party represented by such
counsel in such  proceeding.  In such event,  the Company shall pay for only one
separate legal counsel for the  Investors;  such legal counsel shall be selected
by the Investors  holding a majority in interest of the  Registrable  Securities
included in the Registration  Statement to which the Claim relates.  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.

               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 1933 Act)  shall be  entitled  to  contribution  from any seller of
Registrable  Securities who was not guilty of such fraudulent  misrepresentation
and (c) contribution by any seller of Registrable Securities shall be limited in
amount to the amount by which the net amount of proceeds received by such seller
from the sale of such Registrable  Securities exceeds the purchase price paid by
such seller for such Registrable Securities.

               8. Reports under 1934 Act. With a view to making available to the
Investors the benefits of 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 1933 Act and the 1934 Act; and

               (c)  furnish  to each  Investor  so long  as such  Investor  owns
Registrable  Securities,  promptly upon request,  (i) a written statement by the
Company that it has complied with the reporting requirements of Rule 144 and the
1934  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)

<PAGE>

such other information as may be reasonably requested to permit the Investors to
sell such securities pursuant to Rule 144 without registration.

               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 all or any portion
of such  securities (or to any transferee of all or any portion of the Preferred
Shares or the  Warrants  which  transfer  is  permitted  by Section  4(a) of the
Subscription  Agreement)  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 1933 Act and applicable state securities laws,
and  (d)  at or  before  the  time  the  Company  receives  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  applicable  provisions
contained herein and in the Subscription  Agreement. In connection with any such
transfer the Company  shall,  at its sole cost and expense,  promptly after such
assignment  take such actions as shall be  reasonably  acceptable to the Initial
Investor  and such  transferee  to assure that the  Registration  Statement  and
related  prospectus  are available for use by such  transferee  for sales of the
Registrable  Securities in respect of which the rights to registration have been
so assigned. In connection with any such assignment,  each Investor shall assign
to such transferee such Investor's rights and obligations under the Subscription
Agreement.  Upon such assignment of rights under the Subscription Agreement, the
Company  shall be obligated to such  transferee  to perform all of its covenants
under the Subscription  Agreement as if such transferee were the Buyer under the
Subscription Agreement.

               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  Majority  Holders.  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.  If  the  Company  receives  conflicting  instructions,  notices  or
elections  from  two or more  persons  or  entities  with  respect  to the  same
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
in  writing  and  shall be  deemed  to be  sufficiently  given  when  personally
delivered (by hand, by courier,  by telephone line facsimile  transmission (with
answer back  confirmation)  or other means) (i) if to the Company,  at 3146 Gold
Camp  Drive,  Rancho  Cordova,  California  95670,  Attention:  Chief  Executive
Officer, telephone line facsimile transmission number (916) 858-8728, (ii) if to

<PAGE>

the Initial  Investor at 4111 East 37th Street  North,  Wichita,  Kansas  67220,
Attention:  Josh Taylor,  telephone  line  facsimile  transmission  number (316)
828-7947 and (iii) 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),  and
shall be effective upon receipt.

               (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 enforced,  governed by and construed
in accordance with the laws of the State of California  applicable to agreements
made and to be  performed  entirely  within  such  State.  In the event that any
provision of this  Agreement is invalid or  unenforceable  under any  applicable
statute or rule of law, then such provision  shall be deemed  inoperative to the
extent that it may conflict  therewith  and shall be deemed  modified to conform
with such statute or rule of law. Any  provision  hereof which may prove invalid
or unenforceable  under any law shall not affect the validity or  enforceability
of any other provision hereof.

               (e) 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.

               (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 hereof.

               (i) The Company  acknowledges  that any failure by the Company to
perform its obligations under this Agreement, including, without limitation, the
Company's obligations under Section 3(n), or any delay in such performance could
result in damages to the Investors  and the Company  agrees that, in addition to
any other liability the Company may have by reason of any such failure or delay,
the Company shall be liable for all direct and  consequential  damages caused by
any such failure or delay.

               (j)  Each  party  shall do and  perform,  or cause to be done and
performed,  all such further acts and things,  and shall execute and deliver all
such other  agreements,  certificates,  instruments and documents,  as the other
party may reasonably request in order to carry out the intent and accomplish the
purposes of this Agreement and the consummation of the transactions contemplated
hereby.

<PAGE>

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

               (l) This  Agreement may be executed in two 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.



<PAGE>


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


                                               THERMOGENESIS CORP.



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






                                     By:
                                        -------------------------------





                             SUBSCRIPTION AGREEMENT

                          dated as of December 22, 1999

                                 by and between

                               THERMOGENESIS CORP.
                                       and

                          -----------------------------


                              --------------------



                      SERIES B CONVERTIBLE PREFERRED STOCK
                                       and
                         COMMON STOCK PURCHASE WARRANTS

<PAGE>



                             SUBSCRIPTION AGREEMENT

                      SERIES B CONVERTIBLE PREFERRED STOCK
                                       and
                         COMMON STOCK PURCHASE WARRANTS

                               THERMOGENESIS CORP.

                                TABLE OF CONTENTS

                                                                          Page

1.      AGREEMENT TO
        SUBSCRIBE.............................................................1
        (a)
               Subscription...................................................1
        (b)    Form of Payment................................................1

        (c)    Method of Payment..............................................2
2.      BUYER REPRESENTATIONS, WARRANTIES, ETC................................2
        (a)    Purchase for Investment........................................2
        (b)    Accredited Investor............................................2
        (c)    Reoffers and Resales...........................................2
        (d)    Company Reliance...............................................2
        (e)    Information Provided...........................................2
        (f)    Absence of Approvals...........................................3
        (g)    Subscription Agreement.........................................3

3.      COMPANY REPRESENTATIONS, WARRANTIES,  ETC.............................3
        (a)    Organization and Authority.....................................3
        (b)    Capitalization.................................................3
        (c)    Concerning the Shares and the Common Stock.....................4
        (d)    Subscription Agreement and Other Transaction Documents.........4
        (e)    Non-contravention..............................................4
        (f)    Approvals......................................................5
        (g)    Information Provided...........................................5
        (h)    Absence of Certain Changes.....................................5
        (i)    Absence of Certain Proceedings.................................6
        (j)    Properties.....................................................6
        (k)    Labor Relations................................................7
        (l)    SEC Filings....................................................7
        (m)    Absence of Brokers, Finders,  Etc..............................7
        (n)    No Solicitation................................................7
        (o)    Certain Issuances of Securities................................7
        (p)    Absence of Rights Agreement....................................7

4.      CERTAIN COVENANTS AND ACKNOWLEDGMENTS.................................8
        (a)    Transfer  Restrictions.........................................8
        (b)    Restrictive Legend.............................................8
        (c)    Registration Rights  Agreement.................................9

<PAGE>
        (d)    Form D.........................................................9
        (e)    Authorization for Trading......................................9
        (f)    Use of Proceeds................................................9
        (g)    Blue Sky Laws.................................................10
        (h)    Certain Expenses..............................................10
        (i)    Certain Issuances of Securities...............................10
        (j)    Certain Selling Restrictions..................................11
        (k)    Best Efforts..................................................11

5.      TRANSFER AGENT AGREEMENT.............................................11
        (a)    Transfer Agent Agreement......................................11
        (b)    Conversion Procedure..........................................12

6.      CLOSING DATE.........................................................12

7.      CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL AND ISSUE.............12

8.      CONDITIONS TO THE BUYER'S OBLIGATION TO PURCHASE.....................12

9.      MISCELLANEOUS........................................................13
        (a)    Governing Law.................................................13
        (b)    Counterparts..................................................13
        (c)    Headings, etc.................................................13
        (d)    Severability..................................................14
        (e)    Amendments....................................................14
        (f)    Waivers.......................................................14
        (g)    Notices.......................................................14
        (h)    Assignment....................................................14
        (i)    Survival of Representations and Warranties....................14
        (j)    Entire Agreement..............................................14
        (k)    Termination...................................................14
        (l)    Further Assurances............................................15
        (m)    Public Statements, Press Releases, Etc........................15
        (n)    Construction..................................................15

SCHEDULES

Schedule 3(a)      Subsidiaries
Schedule 3(b)      Antidilution Adjustments
Schedule 3(c)-1    Participation Rights
Schedule 3(c)-2    Nasdaq Matters
Schedule 3(i)      Certain Proceedings
Schedule 3(n)      Sales of Securities


ANNEXES

Annex I               Form of Certificate of Designations
Annex II              Form of Common Stock Purchase Warrant

<PAGE>

Annex III             Joint Escrow Instructions
Annex IV              Form of Registration Rights Agreement
Annex V               Form of Transfer Agent Agreement
Annex VI              Form of Notice of Conversion of Series B Convertible
                      Preferred Stock
Annex VII             Form of Opinion of Counsel to Be Delivered on Closing Date
Annex VIII            Form of Opinion of General  Counsel of the  Company to Be
                      Delivered  on Closing Date


<PAGE>


                             SUBSCRIPTION AGREEMENT

               THIS  SUBSCRIPTION  AGREEMENT,  dated as of December 22, 1999, by
and between  THERMOGENESIS CORP., a Delaware  corporation (the "Company"),  with
headquarters located at 3146 Gold Camp Drive, Rancho Cordova,  California 95670,
and KOCH INVESTMENT GROUP LIMITED, a Delaware corporation (the "Buyer").

                              W I T N E S S E T H:

               WHEREAS, the Buyer wishes to purchase, upon the terms and subject
to the conditions of this Agreement, shares of non-voting, convertible preferred
stock of the Company  which will be  convertible  into  shares of Common  Stock,
$.001 par value (the "Common Stock"), of the Company and in connection therewith
the Company is to issue to the Buyer warrants to purchase shares of Common Stock
as provided in this Agreement; and

               WHEREAS,  the Company and the Buyer are executing and  delivering
this  Agreement in reliance  upon the  exemption  from  securities  registration
afforded by Rule 506 of  Regulation D  ("Regulation  D") as  promulgated  by the
Securities and Exchange Commission (the "SEC") under the Securities Act of 1933,
as amended (the "1933 Act");

               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 parties agree as
follows:

               1.     AGREEMENT TO SUBSCRIBE; PURCHASE PRICE.

               (a)  Subscription.  The Buyer hereby  agrees to purchase from the
Company the number of shares (the  "Preferred  Shares") of Series B  Convertible
Preferred  Stock,  $.001 par value (the "Preferred  Stock"),  of the Company set
forth on the signature page of this  Agreement,  having the terms and conditions
as set forth in the form of the  Certificate  of  Designations  of the  Series B
Convertible  Preferred  Stock attached  hereto as Annex I (the  "Certificate  of
Designations")  at the price per share and for the aggregate  purchase price set
forth  on the  signature  page of this  Agreement  (the  "Purchase  Price").  In
connection with the purchase of the Preferred  Shares by the Buyer,  the Company
shall  issue to the  Buyer,  at the  closing  on the  Closing  Date (as  defined
herein),  Common Stock Purchase Warrants in the form attached hereto as Annex II
(the  "Warrants")  to  purchase a number of shares of Common  Stock equal to the
amount  obtained by  multiplying  (i) the quotient  obtained by dividing (x) the
Purchase  Price by (y) the average  closing bid price of the Common Stock on the
Nasdaq  SmallCap  Market  ("Nasdaq")  for  the  ten  consecutive   trading  days
immediately  prior to the Closing  Date times (ii) 0.25  (subject to  adjustment
after  issuance of the  Warrants as  provided  in the  Warrants).  The shares of
Common Stock  issuable  upon  exercise of the Warrants are referred to herein as
the "Warrant Shares." The Warrant Shares and the shares of Common Stock issuable
upon conversion of the Preferred  Shares are referred to herein  collectively as
the "Common  Shares." The Common Shares and the Preferred Shares are referred to
herein collectively as the "Shares." The Shares and the Warrants are referred to
herein collectively as the "Securities."

               (b) Form of Payment.  The Buyer shall pay the Purchase  Price for
the Preferred  Shares by delivering  good funds in United States  Dollars to the
escrow agent (the "Escrow  Agent")  identified in the Joint Escrow  Instructions
attached hereto as Annex III (the "Joint Escrow Instructions"). Such delivery of

<PAGE>

funds shall be made against  delivery by the Company of the certificates for the
Preferred  Shares and the  Warrants  registered  in the name of the Buyer or its
nominee.  Promptly  following  payment by the Buyer to the  Escrow  Agent of the
Purchase  Price,  but in any event prior to the Closing Date,  the Company shall
deliver  certificates for the Preferred  Shares and the Warrants,  registered in
the name of the Buyer or its nominee,  to the Escrow Agent. The certificates for
the Preferred  Shares shall be delivered by the Company to the Escrow Agent on a
delivery  against payment basis at the closing.  By signing this Agreement,  the
Buyer and the  Company  each agrees to all of the terms and  conditions  of, and
becomes a party to, the Joint  Escrow  Instructions,  all of the  provisions  of
which are incorporated herein by this reference as if set forth in full.

               (c)  Method of  Payment.  Payment of the  Purchase  Price for the
Preferred Shares shall be made by wire transfer of funds to:

               Citibank, N.A.
               153 East 53rd Street
               New York, New York 10043
               ABA#021000089

               For credit to A/C#37179446
               For credit to the account of Brian W. Pusch Attorney Escrow
               Account, Reference:  Koch/ThermoGenesis

Not later than 4:00 p.m.,  New York City time, on the date which is two Business
Days after the Company shall have accepted this  Agreement and returned a signed
counterpart of this Agreement to the Buyer or its legal counsel, the Buyer shall
deposit with the Escrow Agent an amount equal to the Purchase  Price. As used in
this  Agreement,  the term  "Business  Day" means any day other than a Saturday,
Sunday  or  other  day on  which  commercial  banks  in The City of New York are
authorized or required by law to remain closed.

               2.     BUYER REPRESENTATIONS, WARRANTIES, ETC.

               The Buyer  represents  and warrants to, and  covenants and agrees
with, the Company as follows:

               (a)  Purchase  for  Investment.   The  Buyer  is  purchasing  the
Preferred Shares and acquiring the Warrants,  and will acquire the Common Shares
upon conversion of the Preferred Shares or exercise of the Warrants, for its own
account  for  investment  only and not with a view  towards  the public  sale or
distribution thereof;

               (b) Accredited Investor. The Buyer is an "accredited investor" as
that term is defined in Rule 501 of the General Rules and Regulations  under the
1933 Act by reason of Rule 501(a)(3);

               (c) Reoffers and Resales.  All subsequent offers and sales of the
Securities by the Buyer shall be made pursuant to registration of the Securities
being  offered  and sold under the 1933 Act or  pursuant  to an  exemption  from
registration;

               (d) Company  Reliance.  The Buyer  understands that the Preferred
Shares are being offered and sold, the Warrants are being issued, and the Common
Shares are being offered,  in each case to it in reliance on specific exemptions

<PAGE>

from the registration requirements of United States federal and state securities
laws and that the  Company is relying  upon the truth and  accuracy  of, and the
Buyer's   compliance   with,  the   representations,   warranties,   agreements,
acknowledgments  and  understandings  of the Buyer set forth  herein in order to
determine the  availability  of such exemptions and the eligibility of the Buyer
to acquire the Preferred  Shares and the Warrants and to receive an offer of the
Common Shares;

               (e)  Information  Provided.  The Buyer and its advisors,  if any,
have been  furnished with all materials  relating to the business,  finances and
operations  of the Company and  materials  relating to the offer and sale of the
Preferred  Shares and the  issuance of the  Warrants and the offer of the Common
Shares which have been  requested by the Buyer;  the Buyer and its advisors,  if
any, have been afforded the opportunity to ask questions of the Company and have
received  satisfactory  answers  to any such  inquiries;  without  limiting  the
generality of the foregoing,  the Buyer has had the opportunity to obtain and to
review the  Company's  (1) Annual  Report on Form 10-K for the fiscal year ended
June 30,  1999 (the  "1999  10-K"),  (2)  Quarterly  Report on Form 10-Q for the
fiscal quarter ended September 30, 1999, and (3) definitive  proxy statement for
the Company's  1999 Annual  Meeting of  Shareholders  to be held on December 10,
1999, in each case as filed with the SEC (collectively,  the "SEC Reports"); and
the Buyer  understands  that its investment in the Shares involves a high degree
of risk;

               (f) Absence of Approvals.  The Buyer  understands  that no United
States federal or state agency or any other  government or  governmental  agency
has passed on or made any recommendation or endorsement of the Shares; and

               (g)  Subscription  Agreement.  This  Agreement  has been duly and
validly authorized, executed and delivered on behalf of the Buyer and is a valid
and binding  agreement of the Buyer  enforceable  in accordance  with its terms,
subject as to enforceability to general  principles of equity and to bankruptcy,
insolvency,  moratorium  and other  similar laws  affecting the  enforcement  of
creditors' rights generally.

               3.     COMPANY REPRESENTATIONS, WARRANTIES, ETC.

               The Company  represents and warrants to, and covenants and agrees
with, the Buyer that:

               (a) Organization and Authority. The Company is a corporation duly
organized,  validly  existing  and  in  good  standing  under  the  laws  of its
jurisdiction  of  incorporation,  and  has all  requisite  corporate  power  and
authority  to (i) own,  lease and  operate  its  properties  and to carry on its
business as now being  conducted,  and (ii) to execute,  deliver and perform its
obligations under this Agreement, the Certificate of Designations, the Warrants,
the Registration Rights Agreement, the form of which is attached hereto as Annex
IV (the "Registration Rights Agreement"), the Transfer Agent Agreement, the form
of which is attached hereto as Annex V (the "Transfer Agent Agreement"), and the
other  agreements  to be executed  and  delivered  by the Company in  connection
herewith,  and to consummate the transactions  contemplated  hereby and thereby.
The Company is duly qualified to do business as a foreign  corporation and is in
good standing in all jurisdictions  wherein such  qualification is necessary and
where  failure  so to  qualify  could  have a  material  adverse  effect  on the
business,  properties,  operations,  condition (financial or other),  results of
operations or prospects of the Company.  All  subsidiaries  and persons in which
the Company has an equity  investment  are  disclosed  on Schedule  3(a) to this
Agreement and, except as disclosed on Schedule 3(a), have no assets,  operations

<PAGE>

or   liabilities,   including,   without   limitation,   indirect,   contingent,
environmental or litigation-related liabilities.

               (b)  Capitalization.  The authorized capital stock of the Company
consists of (1)  50,000,000  shares of Common Stock of which  21,188,262  shares
were  outstanding  on  December  17,  1999,  all of  which  are  fully  paid and
nonassessable;  and (2) 2,000,000 shares of Preferred Stock, $.001 par value, of
which (A) 1,200,000  shares are  designated  as Series A  Convertible  Preferred
Stock (the "Series A Preferred  Stock"),  of which 770,000 shares are issued and
outstanding,  and (B) 4,080 shares will be  designated  as Series B  Convertible
Preferred  Stock of which 4,000 shares will be issued pursuant to this Agreement
and the other  subscription  agreement  for the  purchase of shares of Preferred
Stock and the  acquisition of common stock purchase  warrants being entered into
in connection herewith (the "Other Subscription Agreement");  and on the Closing
Date there will be (x) no material increase from December 17, 1999 in the number
of shares of Common Stock  outstanding  and (y) no issuances of preferred  stock
except  as  issued  pursuant  to  this  Agreement  and  the  Other  Subscription
Agreement.  As of  December  17,  1999,  the Company  had  outstanding  Series A
Preferred Stock,  options,  warrants and similar rights entitling the holders to
purchase an  aggregate of 9,760,429  shares of Common  Stock.  Other than as set
forth in the  preceding  sentence,  the Company  does not have  outstanding  any
material  amount of securities  (or  obligations  to issue any such  securities)
convertible into, exchangeable for or otherwise entitling the holders thereof to
acquire  shares of Common  Stock,  except as disclosed  in the SEC Reports.  The
Company has duly  reserved  from its  authorized  and unissued  shares of Common
Stock  the  full  number  of  shares  required  for (a) all  options,  warrants,
convertible  securities and other rights to acquire shares of Common Stock which
are  outstanding and (b) all shares of Common Stock and options and other rights
to acquire shares of Common Stock which may be issued or granted under the stock
option  and  similar  plans  which  have  been  adopted  by  the  Company.  Each
outstanding  class or series of securities for which any antidilution or similar
adjustment  arising by reason of the  issuance or  conversion  of the  Preferred
Shares or the issuance or exercise of the Warrants or the issuance or conversion
of the shares of Preferred Stock and the issuance or exercise of the warrants to
be issued pursuant to the Other Subscription  Agreement will occur is identified
on  Schedule  3(b)  to  this  Agreement,   together  with  the  amount  of  such
antidilution  adjustment.  The  outstanding  shares of Common Stock and Series A
Preferred  Stock  and  outstanding   options,   warrants  and  other  securities
convertible into,  exchangeable for or otherwise entitling the holder thereof to
acquire  shares of Common Stock have been duly  authorized  and validly  issued.
None of such  outstanding  shares of Common  Stock,  Series A  Preferred  Stock,
options,  warrants  and other  securities  has been issued in  violation  of the
preemptive rights of any securityholder of the Company.  The offers and sales of
the  outstanding  shares of Common  Stock,  Series A Preferred  Stock,  and such
options,  warrants  and  other  securities  were at all  relevant  times  either
registered  under the 1933 Act and applicable  state  securities  laws or exempt
from such  requirements.  No holder of any of the Company's  securities  has any
rights,  "demand," "piggy-back" or otherwise, to have such securities registered
by reason of the intention to file,  filing or effectiveness of the Registration
Statement (as defined in the Registration Rights Agreement).

               (c) Concerning  the Shares and the Common Stock.  The Shares have
been  duly  authorized.  The  Preferred  Shares,  when  issued  and  paid for in
accordance  with  this  Agreement,  and the  Common  Shares,  when  issued  upon
conversion  of the  Preferred  Shares  in  accordance  with the  Certificate  of
Designations  or upon exercise of the Warrants in  accordance  with the terms of
the Warrants,  as the case may be, will be duly and validly  issued,  fully paid

<PAGE>

and non-assessable and will not subject the holder thereof to personal liability
by reason of being such holder.  Except as disclosed on Schedule  3(c)-1 to this
Agreement,  there are no preemptive or similar rights of any  stockholder of the
Company or any other  person to acquire any of the Shares or the  Warrants.  The
Company has duly reserved 4,236,000 shares of Common Stock for conversion of the
shares of Preferred Stock and exercise of the Warrants and the warrants issuable
in  connection  with the Other  Subscription  Agreement,  and such shares  shall
remain so reserved  (subject to reduction from time to time for shares of Common
Stock issued upon conversion of shares of Preferred Stock or redemption or other
permitted  retirement of shares of Preferred Stock),  and the Company shall from
time to time reserve such additional shares of Common Stock as shall be required
to be  reserved  pursuant to the  Certificate  of  Designations,  as long as the
Preferred  Stock is  convertible,  and pursuant to the Warrants,  as long as the
Warrants are  exercisable.  The Common Stock is listed for trading on Nasdaq and
(1) the Company and the Common Stock meet the criteria for continued listing and
trading on Nasdaq; (2) except as disclosed on Schedule 3(c)-2 to this Agreement,
the Company has not been notified since January 1, 1997 by Nasdaq of any failure
or potential  failure to meet the criteria for continued  listing and trading on
Nasdaq and (3) no  suspension  of trading in the Common Stock is in effect.  The
Company  knows of no reason  that the Common  Shares  will not be  eligible  for
listing on Nasdaq.

               (d) Subscription Agreement and Other Transaction Documents.  This
Agreement,  the Certificate of Designations,  the Registration Rights Agreement,
the Warrants and the  Transfer  Agent  Agreement  and the other  agreements  and
instruments   contemplated  hereby  and  thereby  have  been  duly  and  validly
authorized by the Company,  this  Agreement has been duly executed and delivered
by the Company and this Agreement is, and the Registration Rights Agreement, the
Warrants  and the  Transfer  Agent  Agreement  and such other  agreements,  when
executed and delivered by the Company, will be, valid and binding obligations of
the Company enforceable in accordance with their respective terms, subject as to
enforceability  to general  principles of equity and to bankruptcy,  insolvency,
moratorium and other similar laws affecting the enforcement of creditors' rights
generally.

               (e) Non-contravention.  The execution and delivery by the Company
of this Agreement and the other documents contemplated by this Agreement and the
consummation  by the  Company of the  issuance of the  Preferred  Shares and the
Warrants  as  contemplated  by  this  Agreement,   and  the  other  transactions
contemplated  by  this  Agreement,   the   Certificate  of   Designations,   the
Registration Rights Agreement,  the Warrants and the Transfer Agent Agreement do
not and will not,  with or without the giving of notice or the lapse of time, or
both (i) result in any violation of any terms of the Articles of  Incorporation,
as amended, or By-laws of the Company , (ii) conflict with or result in a breach
by the Company of any of the terms or  provisions  of, or  constitute  a default
under, or result in the modification, amendment, termination or cancellation of,
result in the  acceleration of any obligation of the Company under, or result in
the creation or imposition of any lien, security interest, charge or encumbrance
upon any of the properties or assets of the Company  pursuant to, any indenture,
mortgage, deed of trust or other agreement or instrument to which the Company is
a party or by which the Company or any of its  properties  or assets is bound or
affected,  (iii) violate or contravene any applicable law, rule or regulation or
any applicable decree,  judgment or order of any court, United States federal or
state regulatory body,  administrative  agency or other governmental body having
jurisdiction  over the Company or any of its  properties  or assets or (iv) have
any  material  adverse  effect  on  any  permit,  certification,   registration,
approval,  consent,  license or  franchise  necessary  for the Company to own or
lease and operate any of its properties or to conduct any of its business or the
ability of the Company to make use thereof.

<PAGE>

               (f)  Approvals.  No  authorization,  approval  or consent  of, or
filing with, any court,  governmental body,  regulatory agency,  self-regulatory
organization,  or stock exchange or market or the stockholders of the Company is
required to be obtained or made by the Company for (1) the  execution,  delivery
and  performance  by the  Company of this  Agreement,  the  Registration  Rights
Agreement,  the Warrants,  the Transfer Agent Agreement and the other agreements
and instruments  contemplated hereby and thereby, (2) the execution,  filing and
performance by the Company of the Certificate of Designations,  (3) the issuance
and  sale  of  the  Preferred  Shares  and  the  issuance  of  the  Warrants  as
contemplated  by this  Agreement  and (4)  the  issuance  of  Common  Shares  on
conversion of the Preferred  Shares or upon the exercise of the Warrants,  other
than (u) the filing with the SEC after the Closing  Date of a Current  Report on
Form 8-K with respect to the  transactions  contemplated by this Agreement,  (v)
the filing of the notification for listing of additional  shares with the Nasdaq
pursuant to Section 4(e), (w) the filing of the Certificate of Designations with
the Secretary of State of the State of Delaware,  (x) registration of the resale
of the Common  Shares  under the 1933 Act as  contemplated  by the  Registration
Rights  Agreement,  (y) as may be required under  applicable state securities or
"blue  sky"  laws and (z)  filing  of one or more  Forms D with  respect  to the
Securities as required under Regulation D.

               (g)  Information  Provided.  The  information  provided  by or on
behalf  of  the  Company  to the  Buyer  in  connection  with  the  transactions
contemplated by this Agreement,  including,  without limitation, the information
referred  to in Section  2(e) of this  Agreement,  does not  contain  any untrue
statement  of a material  fact or omit to state any material  fact  necessary in
order to make the statements  therein,  in the light of the circumstances  under
which they are made, not misleading,  it being  understood that, for purposes of
this Section 3(g), any statement  contained in such information  shall be deemed
to be modified or  superseded  for  purposes of this  Section 3(g) to the extent
that a statement in any document included in such information which was prepared
or filed with the SEC on a later  date  modifies  or  replaces  such  statement,
whether or not such later prepared or filed statement so states. The Company has
not filed any reports with the SEC under the Securities Exchange Act of 1934, as
amended (the "1934 Act"), since June 30, 1999 other than the SEC Reports.

               (h) Absence of Certain  Changes.  Since June 30, 1999,  there has
been no material  adverse  change and no  material  adverse  development  in the
business,  properties,  operations,  condition (financial or other),  results of
operations or prospects of the Company,  except as disclosed in the SEC Reports.
Except as and to the extent  disclosed,  reflected  or  reserved  against in the
financial  statements of the Company and the notes  thereto  included in the SEC
Reports,  the  Company  has  no  material  (individually  or in  the  aggregate)
liabilities,  debts or  obligations  whether  accrued,  absolute,  contingent or
otherwise,  and whether due or to become due.  Subsequent to June 30, 1999,  the
Company has not incurred any  liabilities,  debts or  obligations  of any nature
whatsoever which are  individually or in the aggregate  material to the Company,
other than those incurred in the ordinary course of its business or disclosed in
the SEC Reports.

               (i) Absence of Certain  Proceedings.  Except as  disclosed in the
SEC Reports,  there is no action,  suit,  proceeding,  inquiry or  investigation
before or by any court, arbitrator,  public board or body or governmental agency
(collectively,  an  "Action")  pending  or,  to the  knowledge  of the  Company,
threatened  against  the  Company,  in any  such  case  wherein  an  unfavorable
decision,  ruling or finding would have a material  adverse  effect on business,
properties, operations, condition (financial or other), results of operations or

<PAGE>

prospects of the Company or the  transactions  contemplated by this Agreement or
any of the documents  contemplated  hereby or which would  adversely  affect the
validity or  enforceability  of, or the  authority  or ability of the Company to
perform its obligations  under,  this Agreement or any of such other  documents;
except as disclosed on Schedule 3(i) to this Agreement,  neither the Company nor
any  director  or  officer  thereof  is or has been the  subject  of any  Action
involving a claim of violation of or liability under federal or state securities
laws or a claim of breach of  fiduciary  duty;  except as  disclosed on Schedule
3(i) to this  Agreement,  the Company does not have  pending  before the SEC any
request  for  confidential  treatment  of  information  and to the  best  of the
Company's  knowledge no such  request  will be made by the Company  prior to the
time  the  Registration  Statement  relating  to  the  Common  Shares  which  is
contemplated by the Registration  Rights Agreement is first ordered effective by
the SEC;  and  there has not been,  and to the best of the  Company's  knowledge
there is not pending or contemplated, any investigation by the SEC involving the
Company or any current or former director or officer of the Company.

               (j)  Properties.  The  Company  has good  title  to or  leasehold
interests in all property real and personal  (tangible and intangible) and other
assets  owned  by them,  free and  clear  of all  security  interests,  charges,
mortgages,  liens or other  encumbrances,  except with respect to capital  lease
obligations  and protective  filings by lessors and except such as are described
in the SEC Reports or such as do not  materially  interfere with the use of such
property made, or proposed to be made, by the Company.  The leases,  licenses or
other  contracts  or  instruments  under which the Company  leases,  holds or is
entitled  to use any  property,  real or  personal,  are valid,  subsisting  and
enforceable  with only such  exceptions as do not materially  interfere with the
use of such property  made, or proposed to be made, by the Company.  The Company
has not  received  notice  of any  material  violation  of any  applicable  law,
ordinance,  regulation,  order or  requirement  relating  to its owned or leased
properties.  The Company does not have any knowledge of, and the Company has not
given or received any notice of, any pending  conflicts with or  infringement of
the rights of others with respect to any Company  Proprietary Rights (as defined
herein) or with respect to any license of Company Proprietary Rights. No action,
suit, arbitration, or legal, administrative or other proceeding or investigation
is pending, or, to the best knowledge of the Company, threatened, which involves
any Company  Proprietary  Rights.  The  Company is not subject to any  judgment,
order,  writ,  injunction or decree of any court or any federal,  state,  local,
foreign or other governmental department,  commission,  board, bureau, agency or
instrumentality,  domestic or foreign, or any arbitrator, or has entered into or
is a party  to any  contract  which  restricts  or  impairs  the use of any such
Company  Proprietary  Rights in a manner  which  would have a  material  adverse
effect on the use by the Company of any of the Company  Proprietary  Rights.  To
the best knowledge of the Company, no Company Proprietary Rights and no services
or products sold by the Company  conflict with or infringe upon any  proprietary
rights available to any third party. The Company has not received written notice
of any pending conflict with or infringement  upon such third-party  proprietary
rights.  The  Company  has  not  entered  into  any  consent,   indemnification,
forbearance to sue or settlement  agreement with respect to Company  Proprietary
Rights  other  than in the  ordinary  course of  business.  No claims  have been
asserted by any person with respect to the validity of the  Company's  ownership
or right to use the Company Proprietary Rights and, to the best knowledge of the
Company,  there is no reasonable  basis for any such claim to be successful.  To
the best knowledge of the Company,  the Company Proprietary Rights are valid and
enforceable.  No  registration  relating to the Company  Proprietary  Rights has
lapsed,  expired or been abandoned or canceled or is the subject of cancellation
or other adversarial proceedings,  and all applications therefor are pending and
are in  good  standing,  except  for  such  lapses,  expirations,  abandonments,
cancellations,  adversarial proceedings or failures to be in good standing which

<PAGE>

would not,  singly or in the  aggregate,  have a material  adverse effect on the
business,  properties,  operations,  condition (financial or other),  results of
operations  or  prospects  of the  Company.  The  Company has  complied,  in all
material respects,  with its respective contractual  obligations relating to the
protection of the Company  Proprietary Rights used pursuant to licenses.  To the
best  knowledge  of the Company,  no person is  infringing  on or violating  the
Company  Proprietary  Rights.  As used  herein,  the term  "Company  Proprietary
Rights" means all patents, patent applications,  inventions,  trademarks,  trade
names, applications for registration of trademarks,  service marks, service mark
applications,  domain  names,  copyrights,  know-how,  manufacturing  processes,
formulae,  trade  secrets,  licenses  and  rights in any  thereof  and any other
intangible property and assets which are material to the business of the Company
as now conducted, as proposed to be conducted or as described in this Agreement.

               (k) Labor Relations.  Except as disclosed in the SEC Reports,  no
material labor problem  exists or, to the knowledge of the Company,  is imminent
with respect to any of the employees of the Company.

               (l) SEC Filings. The Company has timely filed all required forms,
reports and other  documents  required  to be filed by the Company  with the SEC
under the 1934 Act.  All of such forms,  reports and other  documents  complied,
when filed, in all material  respects,  with all applicable  requirements of the
1933 Act and the 1934 Act.

               (m)  Absence of  Brokers,  Finders,  Etc.  No  broker,  finder or
similar  person is  entitled to any  commission,  fee or other  compensation  by
reason of the  transactions  contemplated  by this Agreement other than Reedland
Capital Partners, a Division of Financial West Group, and the Company shall pay,
and indemnify and hold harmless the Buyer from, any claim made against the Buyer
by such  entity  or any  other  person  for any  such  commission,  fee or other
compensation.

               (n) No Solicitation.  No form of general  solicitation or general
advertising was used by the Company or, to the best of its knowledge,  any other
person acting on behalf of the Company,  in respect of or in connection with the
offer and sale of the  Securities.  Except as disclosed on Schedule 3(n) to this
Agreement,  neither the  Company  nor, to its  knowledge,  any person  acting on
behalf of the Company has,  either  directly or indirectly,  sold or offered for
sale to any person any of the  Preferred  Shares or the Warrants or,  within the
six months prior to the date hereof,  any other similar  security of the Company
except as contemplated by this Agreement and the Other  Subscription  Agreement;
and neither the Company nor any person authorized to act on its behalf will sell
or offer for sale any  shares of  Preferred  Stock or shares of Common  Stock or
Warrants,  or solicit any offers to buy any shares of Preferred  Stock or shares
of Common Stock or Warrants,  so as thereby to cause the issuance or sale of any
of the Shares or the issuance of the Warrants to be in violation of Section 5 of
the 1933 Act.

               (o) Certain  Issuances of Securities.  The Company has not issued
any shares of Common Stock or shares of any series of  preferred  stock or other
securities convertible into,  exchangeable for or otherwise entitling the holder
to acquire  shares of Common Stock which are subject to Rule  4310(c)(25)(H)  of
the  Nasdaq as in  effect  from time to time or any  successor,  replacement  or
similar  provision  thereof or of any other  market on which the Common Stock is
listed  for  trading  (the  "Stockholder  Approval  Rule")  and  which  would be
integrated with the sale of the Preferred Shares to the Buyer or the issuance of

<PAGE>

Common  Shares upon  conversion  thereof or upon  exercise of the  Warrants  for
purposes of the Stockholder Approval Rule.

               (p)  Absence of Rights  Agreement.  The Company has not adopted a
shareholder  rights plan or similar  arrangement  relating to  accumulations  of
beneficial ownership of Common Stock or a change in control of the Company.

               4.     CERTAIN COVENANTS AND ACKNOWLEDGMENTS.

               (a) Transfer Restrictions.  The Company and the Buyer acknowledge
and agree that (1) the  Preferred  Shares and the Warrants have not been and are
not  being  registered  under  the  provisions  of the 1933 Act and,  except  as
provided in the Registration  Rights Agreement with respect to the resale of the
Common Shares,  the Common Shares have not been and are not being registered for
resale under the 1933 Act, and the Securities may not be transferred  unless (A)
subsequently  registered  for  resale  thereunder  or (B) the Buyer  shall  have
delivered to the Company an opinion of counsel, reasonably satisfactory in form,
scope and substance to the Company, to the effect that the Securities to be sold
or  transferred  may be sold or  transferred  pursuant to an exemption from such
registration;  (2) any resale of the  Securities  made in  reliance  on Rule 144
promulgated  under the 1933 Act may be made only in accordance with the terms of
said  Rule and  further,  if said  Rule is not  applicable,  any such  resale of
Securities under  circumstances in which the seller,  or the person through whom
the sale is made,  may be deemed to be an  underwriter,  as that term is used in
the 1933 Act, may require  compliance  with some other  exemption under the 1933
Act or the rules and  regulations  of the SEC  thereunder;  and (3)  neither the
Company nor any other person is under any  obligation to register the Securities
(other than pursuant to the Registration Rights Agreement) under the 1933 Act or
to comply with the terms and conditions of any exemption  thereunder (other than
pursuant  to  Section  4(d)  hereof  and  pursuant  to the  Registration  Rights
Agreement).  Any transfer of the Preferred  Shares or the Warrants shall be made
in compliance with Section 9(h).

               (b) Restrictive  Legend.  (1) The Buyer  acknowledges  and agrees
that the Preferred Shares shall bear a restrictive  legend in substantially  the
following form (and a stop-transfer  order may be placed against transfer of the
Preferred Shares):

        The securities  represented by this certificate have not been registered
        under the Securities Act of 1933, as amended.  The securities  have been
        acquired for investment and may not be sold,  transferred or assigned in
        the absence of an effective  registration  statement for the  securities
        under the Securities  Act of 1933, as amended,  or an opinion of counsel
        that registration is not required under said Act.

        The  number of shares  constituting  the  portion of the  Maximum  Share
        Amount,  as defined in the  Certificate of  Designations of the Series B
        Convertible   Preferred  Stock  (the  "Certificate  of   Designations"),
        allocated to the shares  represented by this certificate for purposes of
        conversion thereof is 1,588,500.

        Section 10(b)(3)(a) of the Certificate of Designations  permits a holder
        of the  securities  represented  by this  certificate  to  convert  such
        securities in accordance with the  Certificate of  Designations  without
        being required to surrender  this  certificate to the Company unless all
        of the  securities  represented  hereby are so converted.  Consequently,
        following  conversion  of any  of the  securities  represented  by  this
        certificate, the number of shares represented by this certificate may be

<PAGE>

        less than the  number of  shares  stated  hereon.  Upon  request  of any
        proposed  transferee  of this  certificate,  the  Company  will  provide
        confirmation of the number of shares evidenced by this certificate.

               (2) The Buyer further  acknowledges  and agrees that the Warrants
shall bear a  restrictive  legend in  substantially  the  following  form (and a
stop-transfer order may be placed against transfer of the Warrants):

        The securities  represented by this certificate have not been registered
        under the Securities Act of 1933, as amended.  The securities  have been
        acquired for investment  and may not be resold,  transferred or assigned
        in the absence of an effective registration statement for the securities
        under the Securities  Act of 1933, as amended,  or an opinion of counsel
        that registration is not required under said Act.

               (3) The Buyer  further  acknowledges  and agrees  that until such
time as the Common Shares have been  registered for resale under the 1933 Act as
contemplated by the  Registration  Rights  Agreement,  the  certificates for the
Common Shares may bear a restrictive  legend in substantially the following form
(and a stop-transfer  order may be placed against  transfer of the  certificates
for the Common Shares):

        The securities  represented by this certificate have not been registered
        under the Securities Act of 1933, as amended.  The securities  have been
        acquired for investment  and may not be resold,  transferred or assigned
        in the absence of an effective registration statement for the securities
        under the Securities  Act of 1933, as amended,  or an opinion of counsel
        that registration is not required under said Act.

               (4) Once the Registration  Statement  required to be filed by the
Company  pursuant to Section 2 of the  Registration  Rights  Agreement  has been
declared  effective,  thereafter  (1) upon request of the Buyer the Company will
substitute  certificates  without  restrictive  legend for  certificates for any
Common Shares issued prior to the date such  Registration  Statement is declared
effective  by the  SEC  which  bear  such  restrictive  legend  and  remove  any
stop-transfer  restriction relating thereto promptly, but in no event later than
three  Trading  Days (as  defined  in the  Certificate  of  Designations)  after
surrender of such  certificates by the Buyer and (2) the Company shall not place
any restrictive legend on certificates for Common Shares issued on conversion of
the   Preferred   Shares  or  upon  exercise  of  the  Warrants  or  impose  any
stop-transfer restriction thereon.

               (c) Registration  Rights  Agreement.  The parties hereto agree to
enter into the  Registration  Rights  Agreement in the form  attached  hereto as
Annex IV on or before the Closing Date.

               (d) Form D. The Company  agrees to file a Form D with  respect to
the Securities as required  under  Regulation D and to provide a copy thereof to
the Buyer  promptly  after such filing.  The Buyer agrees to cooperate  with the
Company in  connection  with such filing and,  upon request of the  Company,  to
provide all  information  relating  to the Buyer  reasonably  required  for such
filing.

               (e) Authorization for Trading; Reporting Status. On or before the
Closing Date,  the Company shall file a  notification  for listing of additional
shares with the Nasdaq relating to the Common Shares and shall provide  evidence

<PAGE>

of such filing to the Buyer. So long as the Buyer  beneficially  owns any of the
Preferred Shares,  the Warrants or the Common Shares, the Company shall file all
reports required to be filed with the SEC pursuant to Section 13 or 15(d) of the
1934 Act and the Company shall not terminate its status as an issuer required to
file  reports  under  the  1934  Act  even  if the  1934  Act or the  rules  and
regulations thereunder would permit such termination.

               (f) Use of Proceeds. The Company does not own or have any present
intention of  acquiring  any "margin  stock" as defined in  Regulation G (12 CFR
Part 207) of the Board of  Governors  of the  Federal  Reserve  System  ("margin
stock").  The proceeds of sale of the Preferred  Shares will be used for general
working capital purposes and in the operation of the Company's business. None of
such  proceeds will be used,  directly or indirectly  (1) to make any loan to or
investment in any other person (other than financing the Company's  subsidiaries
in the  ordinary  course of business or in  connection  with an  acquisition  of
another corporation or business or assets of another corporation or business) or
(2) for the purpose, whether immediate, incidental or ultimate, of purchasing or
carrying  any  margin  stock or for the  purpose  of  maintaining,  reducing  or
retiring any indebtedness which was originally incurred to purchase or carry any
stock that is  currently  a margin  stock or for any other  purpose  which might
constitute the  transactions  contemplated by this Agreement a "purpose  credit"
within the  meaning of such  Regulation  G.  Neither  the  Company nor any agent
acting on its behalf has taken or will take any action  which  might  cause this
Agreement  or the  transactions  contemplated  hereby to violate  Regulation  G,
Regulation  T or any other  regulation  of the Board of Governors of the Federal
Reserve  System or to violate  the 1934 Act, in each case as in effect now or as
the same may hereafter be in effect.

               (g) Blue Sky Laws.  On or before the  Closing  Date,  the Company
shall  take  such  action  as shall be  necessary  to  qualify,  or to obtain an
exemption  for, the Preferred  Shares for sale to the Buyer and the Warrants for
issuance  to the Buyer  pursuant  to this  Agreement  and the Common  Shares for
issuance to the Buyer on conversion of the Preferred  Shares and exercise of the
Warrants  under such of the  securities or "blue sky" laws of  jurisdictions  as
shall be applicable to the sale of the Preferred  Shares and the issuance of the
Warrants  pursuant  to this  Agreement  and the  issuance to the Buyer of Common
Shares on conversion of the Preferred  Shares and exercise of the Warrants.  The
Company shall furnish copies of all filings, applications,  orders and grants or
confirmations of exemptions relating to such securities or "blue sky" laws on or
prior to the Closing Date.

               (h) Certain  Expenses.  At the closing on the Closing  Date,  the
Company shall pay or reimburse the Buyer for all reasonable expenses (including,
without  limitation,  legal  fees and  expenses  of counsel to the Buyer and the
Buyer's due diligence  expenses) not in excess of $25,000  incurred by the Buyer
in connection with this Agreement and the transactions  contemplated  hereby. In
addition,  the Company  shall pay on demand all expenses  incurred by the Buyer,
including  reasonable  attorneys' fees and expenses,  as a consequence of, or in
connection with (1) the negotiation,  preparation or execution of any amendment,
modification or waiver of this Agreement,  the Certificate of Designations,  the
Registration  Rights Agreement,  the Warrants,  the Transfer Agent Agreement and
the other agreements and instruments  contemplated  hereby and thereby requested
by the Company,  (2) any default or breach of any of the  Company's  obligations
set forth in any of such  agreements or instruments  and (3) the  enforcement or
restructuring of any right of, including the collection of any payments due, the
Buyer  under any of such  agreements  or  instruments,  including  any action or
proceeding  relating  to such  enforcement,  or any order,  injunction  or other

<PAGE>

process seeking to restrain the Company from paying any amount due the Buyer, in
which the Buyer prevails.

               (i)  Certain  Issuances  of  Securities.  (1) Unless the  Company
obtains the Stockholder Approval (as defined in the Certificate of Designations)
or a waiver  thereof  from the Nasdaq,  the Company will not issue any shares of
Common  Stock  or  shares  of any  other  series  of  preferred  stock  or other
securities convertible into, exchangeable for, or otherwise entitling the holder
to acquire, shares of Common Stock which would be subject to the requirements of
the Stockholder Approval Rule and which would be integrated with the sale of the
Preferred  Shares and  issuance of the  Warrants to the Buyer or the issuance of
Common Shares upon  conversion  of the Preferred  Shares or upon exercise of the
Warrants for purposes of the Stockholder Approval Rule.

               (2)  During  the period  from the date of this  Agreement  to the
later of (i) the date which is one year after the Closing Date and (ii) the date
on which the  Registration  Statement shall have been effective with the SEC for
270  consecutive  days, the Company shall not offer,  sell,  contract to sell or
issue (or engage any person to assist the Company in taking any such action) (A)
any security  (whether debt or equity) with conversion or exchange terms similar
in nature to the  conversion  rights of the  Preferred  Stock or (B) any  equity
securities  or  securities  convertible  into,  exchangeable  for  or  otherwise
entitling  the holder to acquire,  any Common  Stock at a price below the market
price  of the  Common  Stock  on the  date  of  such  issuance  or the  date  of
conversion, exchange or other exercise thereof (or below an average market price
for a reasonable  period prior to such issuance,  conversion,  exchange or other
exercise) (collectively,  "Equity Securities");  provided, however, that nothing
in this Section  4(i)(2) shall prohibit the Company from issuing  securities (w)
pursuant to compensation plans for employees,  directors,  officers, advisers or
consultants of the Company and in accordance  with the terms of such plans as in
effect  as of the date of this  Agreement,  (x)  upon  exercise  of  conversion,
exchange, purchase or similar rights issued, granted or given by the Company and
outstanding as of the date of this Agreement and disclosed in the SEC Reports or
this  Agreement,  (y)  pursuant  to a  public  offering  underwritten  on a firm
commitment  basis  registered under the 1933 Act or (z) as part of a transaction
involving  a  strategic  alliance,  acquisition  of  stock  or  assets,  merger,
collaboration,  joint venture,  partnership or other similar  arrangement of the
Company with another corporation,  partnership or other business entity which is
engaged in a business  similar to or related to the business of the Company,  so
long as in the case of this clause (z) the Board of Directors by resolution duly
adopted  (and a copy of which shall be  furnished  to the Buyer  promptly  after
adoption) determines that such issuance is fair to the holders of each class and
series of capital stock of the Company and to the Buyer in respect of its equity
interest in the Company  that is  represented  by the  Preferred  Shares and the
Warrants.

               (3) Subject to the  restrictions in Sections 4(i)(1) and 4(i)(2),
during the period from the date of execution  and delivery of this  Agreement to
the date which is one year after the Closing Date,  the Company shall not offer,
sell,  contract  to sell or issue (or engage any person to assist the Company in
taking any such action) any Equity Securities without giving the Buyer the first
right  to  acquire  the  Equity  Securities  on the  same  terms  as the  Equity
Securities are to be offered to other investors;  provided,  however,  that this
Section 4(i)(3) shall not apply to the offer or sale of Equity Securities by the
Company in the transactions, and subject to the conditions, set forth in clauses
(w),  (x), (y) and (z) of the proviso to the first  sentence of Section  4(i)(2)
above.  The Company shall give notice to the Buyer of the detailed  terms of the
Equity  Securities  proposed to be issued and, promptly after being requested by
the Buyer,  such other  information as requested by the Buyer. The Buyer may, by
notice to the Company,  exercise  such right of first  refusal at any time until

<PAGE>

the later of (x) 30  Business  Days after such  notice  from the  Company to the
Buyer and (y) 15  Business  Days  after the  Company  provides  such  additional
information as shall have been requested by the Buyer;  provided,  however, that
if the Company has theretofore  complied in good faith with any such request for
additional  information,  the Buyer must  exercise  such right not later than 45
Business Days after such notice from the Company to the Buyer.

               (j) Certain  Selling  Restrictions.  So long as the Company is in
compliance in all material respects with its obligations to the Buyer under this
Agreement,  the Certificate of  Designations,  the Warrants and the Registration
Rights  Agreement,  during the 20  consecutive  Trading  Days (as defined in the
Certificate of  Designations)  immediately  preceding the Initial Reset Date (as
defined in the  Certificate  of  Designations)  and each Biannual Reset Date (as
defined in the Certificate of Designations),  the Buyer agrees on its behalf and
on behalf of its Affiliates (as defined in the Certificate of Designations) that
it will not sell,  or engage in any short  sales with  respect to, any shares of
Common Stock on Nasdaq or any other securities  market where the Common Stock is
then listed for trading.

               (k) Best Efforts.  Each of the parties shall use its best efforts
timely to satisfy each of the  conditions  to the other party's  obligations  to
sell and purchase the Preferred  Shares set forth in Section 7 or 8, as the case
may be, of this Agreement on or before the Closing Date.

               5.     TRANSFER AGENT AGREEMENT; CONVERSION PROCEDURE.

               (a) Transfer  Agent  Agreement.  Prior to the Closing  Date,  the
Company  will (1) execute and deliver the Transfer  Agent  Agreement in the form
attached hereto as Annex V and thereby irrevocably instruct, American Securities
Transfer & Trust,  Inc., as Transfer Agent and Registrar (the "Transfer Agent"),
to issue certificates for the Common Shares from time to time upon conversion of
the  Preferred  Shares and exercise of the Warrants in such amounts as specified
from time to time to the Transfer Agent in the Notices of Conversion surrendered
in  connection  with such  conversions  and  referred to in Section 5(b) of this
Agreement and the Form of  Subscription in the form attached to the Warrants and
(2) appoint the Transfer Agent the conversion  agent for the Preferred Stock and
the exercise agent for the Warrants.  The certificates for the Common Shares may
bear the restrictive legend specified in Section 4(b) of this Agreement prior to
registration  of the  resale  of the  Common  Shares  under  the 1933  Act.  The
certificates  for the Common Shares shall be registered in the name of the Buyer
or its  designee  and in such  denominations  to be  specified  by the  Buyer in
connection with each conversion of Preferred Shares or exercise of the Warrants.
The  Company  warrants  that no  instruction  other  than (x) such  instructions
referred to in this Section 5, (y) stop transfer  instructions to give effect to
Section 4(a) prior to  registration of the resale of the Common Shares under the
1933 Act and (z) the  instructions  required by Section 3(n) of the Registration
Rights Agreement will be given by the Company to the Transfer Agent and that the
Common Shares shall otherwise be freely transferable on the books and records of
the  Company as and to the extent  provided in this  Agreement.  Nothing in this
Section  5(a) shall limit in any way the Buyer's  obligations  and  agreement to
comply  with the  registration  requirements  of the 1933 Act upon resale of the
Common  Shares.  If the Buyer  provides  the Company with an opinion of counsel,
reasonably  satisfactory  in form,  scope and  substance  to the Company and its
legal  counsel,  that  registration  of a  resale  by  the  Buyer  of any of the
Securities  is not  required  under the 1933 Act,  the Company  shall permit the
transfer of such Securities and, in the case of the Common Shares, in accordance
with clause  (1)(B) of Section  4(a) of this  Agreement,  promptly  instruct the
Transfer  Agent to issue upon  transfer one or more share  certificates  in such

<PAGE>

name and in such  denominations  as specified by the Buyer within three Business
Days after receipt of such opinion. Nothing in this Section 5(a) shall limit the
obligations  of the  Company  under  Section  3(n)  of the  Registration  Rights
Agreement.

               (b)  Conversion  Procedure.  In  connection  with the exercise of
conversion rights relating to the Preferred Shares,  the Buyer or any subsequent
holder of the Preferred Shares shall complete,  sign and furnish to the Transfer
Agent a Notice of Conversion of Series B Convertible Preferred Stock in the form
attached  hereto as Annex VI (a  "Conversion  Notice") and shall  provide a copy
thereof to the Company on the same day, which actions shall be deemed to satisfy
all requirements of the Certificate of Designations.

               6.     CLOSING DATE.

               Subject to the satisfaction or waiver of the conditions set forth
in Sections 7 and 8, the date and time of the issuance and sale of the Preferred
Shares and the  issuance of the  Warrants  (the  "Closing  Date") shall be 12:00
noon,  New York City time,  on or before the date which is three  Business  Days
after the date the Buyer has deposited the Purchase  Price with the Escrow Agent
in  accordance  with Section 1(b), or such other  mutually  agreed to time.  The
closing  shall  occur on the  Closing  Date at the Law Offices of Brian W Pusch,
Penthouse Suite, 29 West 57th Street, New York, New York 10019.

               7.     CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL AND ISSUE.

               The Buyer  understands that the Company's  obligation to sell the
Preferred  Shares and issue the Warrants to the Buyer pursuant to this Agreement
is conditioned upon the satisfaction of the following conditions precedent on or
before the Closing Date (any or all of which may be waived by the Company in its
sole discretion):

               (a) The receipt and  acceptance by the Company of this  Agreement
as evidenced  by  execution of this  Agreement by the Company and delivery of an
executed counterpart of this Agreement to the Buyer or its legal counsel;

               (b)  Delivery  by the Buyer to the Escrow  Agent of good funds as
payment  in full of an amount  equal to the  Purchase  Price  for the  Preferred
Shares in accordance with Section 1(b) hereof; and

               (c) The accuracy on the Closing Date of the  representations  and
warranties  of the Buyer  contained in this  Agreement as if made on the Closing
Date and the  performance  by the Buyer on or  before  the  Closing  Date of all
covenants and  agreements of the Buyer required to be performed on or before the
Closing Date.

               8.     CONDITIONS TO THE BUYER'S OBLIGATION TO PURCHASE.

               The Company  understands that the Buyer's  obligation to purchase
the Preferred Shares and acquire the Warrants on the Closing Date is conditioned
upon the  satisfaction  of the following  conditions  precedent on or before the
Closing  Date  (any or all of  which  may be  waived  by the  Buyer  in its sole
discretion):

<PAGE>

               (a)   Delivery  by  the  Company  to  the  Escrow  Agent  of  the
certificates  for the Preferred  Shares and the Warrants in accordance with this
Agreement;

               (b) The accuracy on the Closing Date of the  representations  and
warranties of the Company  contained in this Agreement as if made on the Closing
Date and the  performance  by the Company on or before the  Closing  Date of all
covenants and  agreements  of the Company  required to be performed on or before
the Closing Date, and receipt by the Buyer of a  certificate,  dated the Closing
Date, of the Chief Executive Officer of the Company  confirming such matters and
such other matters as the Buyer may reasonably request;

               (c) The receipt by the Buyer of  confirmation  of the filing with
the  Secretary  of  State  of  the  State  of  Delaware  of the  Certificate  of
Designations;

               (d) The receipt by the Buyer of a certificate,  dated the Closing
Date,  of the Secretary of the Company  certifying  (1) the Amended and Restated
Certificate  of  Incorporation  and  By-Laws of the  Company as in effect on the
Closing Date and (2) all  resolutions of the Board of Directors (and  committees
thereof)  of the  Company  relating  to  this  Agreement  and  the  transactions
contemplated hereby;

               (e) The  Transfer  Agent shall have  executed and  delivered  the
Transfer Agent Agreement in the form attached hereto as Annex V; and

               (f) Receipt by the Buyer on the Closing Date of (i) an opinion of
Bartel Eng Linn & Schroder,  counsel for the Company, dated the Closing Date, in
form,  scope and substance  reasonably  satisfactory to the Buyer, to the effect
set forth in Annex VII attached  hereto,  and (ii) an opinion of David C. Adams,
Esq., General Counsel of the Company, dated the Closing Date, in form, scope and
substance reasonably satisfactory to the Buyer, to the effect set forth in Annex
VIII attached hereto.

               9.     MISCELLANEOUS.

               (a)    Governing  Law. This Agreement  shall be governed by and
interpreted in accordance with the laws of the State of California.

               (b) Counterparts.  This Agreement may be executed in counterparts
and by the parties hereto on separate counterparts,  all of which together shall
constitute  one  and the  same  instrument.  A  facsimile  transmission  of this
Agreement  bearing a signature  on behalf of a party  hereto  shall be legal and
binding on such party. Although this Agreement is dated as of the date first set
forth above, the actual date of execution and delivery of this Agreement by each
party is the date set forth below such party's  signature on the signature  page
hereof.  Any reference in this Agreement or in any of the documents executed and
delivered  by the  parties  hereto  in  connection  herewith  to (1) the date of
execution  and  delivery  of this  Agreement  by the  Buyer  shall  be  deemed a
reference  to the date set forth below the Buyer's  signature  on the  signature
page  hereof,  (2) the date of execution  and delivery of this  Agreement by the
Company  shall be deemed a reference  to the date set forth below the  Company's
signature  on the  signature  page  hereof  and (3) the  date of  execution  and
delivery  of this  Agreement  or the  date of  execution  and  delivery  of this
Agreement by the Buyer and the Company  shall be deemed a reference to the later
of the dates set forth below the signatures of the parties on the signature page
hereof.

<PAGE>

               (c)  Headings,  etc. The  headings,  captions and footers of this
Agreement are for convenience of reference and shall not form part of, or affect
the interpretation of, this Agreement.

               (d)  Severability.  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.

               (e) Amendments. No amendment,  modification, waiver, discharge or
termination  of any provision of this  Agreement nor consent to any departure by
the Buyer or the Company  therefrom  shall in any event be effective  unless the
same shall be in writing and signed by the party to be charged with enforcement,
and then shall be effective  only in the  specific  instance and for the purpose
for which given.  No course of dealing  between the parties hereto shall operate
as an amendment of this Agreement.

               (f) Waivers. 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, or any course of dealings between the parties, shall not operate as a
waiver thereof or an amendment hereof,  nor shall any single or partial exercise
of any such right or power,  or any  abandonment or  discontinuance  of steps to
enforce such a right or power, preclude any other or further exercise thereof or
exercise of any other right or power.

               (g) Notices.  Any notices required or permitted to be given under
the terms of this Agreement shall be delivered  personally  (which shall include
telephone  line  facsimile  transmission  with answer back  confirmation)  or by
courier  and  shall  be  effective  upon  receipt,  in the  case of the  Company
addressed to the Company at its address shown in the  introductory  paragraph of
this Agreement,  Attention:  Chief Executive  Officer  (telephone line facsimile
transmission  number (916) 858-8728 or, in the case of the Buyer, at its address
or telephone line facsimile  transmission  number shown on the signature page of
this Agreement or such other address or telephone  line  facsimile  transmission
number as a party shall have provided by notice to the other party in accordance
with this provision.  The Buyer hereby  designates as its address for any notice
required or permitted to be given to the Buyer  pursuant to the  Certificate  of
Designations  the address shown on the signature page of this  Agreement,  until
the Buyer shall designate another address for such purpose.

               (h)  Assignment.  Prior to the  Closing  Date,  the Buyer may not
assign its rights and  obligations  under this  Agreement.  Any  transfer of the
Preferred  Shares or the  Warrants by the Buyer after the Closing  Date shall be
made in accordance with Section 4(a) and, in connection with such transfer,  the
Buyer  shall  assign to the  transferee  its rights and  obligations  under this
Agreement  and  the  Registration   Rights  Agreement  by  compliance  with  the
provisions of Section 9 of the Registration Rights Agreement.

               (i) Survival of  Representations  and Warranties.  The respective
representations,  warranties,  covenants  and  agreements  of the  Buyer and the
Company  contained  in  this  Agreement  or  made  by  or  on  behalf  of  them,
respectively,  pursuant to this  Agreement  shall  survive  the  delivery of and
payment  for the  Preferred  Shares  and shall  remain in full  force and effect
regardless  of any  investigation  made by or on  behalf  of them or any  person
controlling or advising any of them.

<PAGE>

               (j)  Entire  Agreement.  This  Agreement  and its  Schedules  and
Annexes set forth the entire  agreement  between the parties hereto with respect
to  the  subject   matter  hereof  and  supersede  all  prior   agreements   and
understandings, whether written or oral, with respect thereto.

               (k) Termination. The Buyer shall have the right to terminate this
Agreement by giving notice to the Company at any time at or prior to the Closing
Date if:

               (1) the Company shall have failed,  refused, or been unable at or
        prior to the date of such  termination  of this Agreement to perform any
        of its obligations hereunder;

               (2) any other condition of the Buyer's  obligations  hereunder is
        not fulfilled; or

               (3) the closing  shall not have  occurred on a Closing Date on or
        before  December  23,  1999,  or such  later date as the  parties  shall
        mutually  agree,  other  than  solely  by  reason  of a  breach  of this
        Agreement by the Buyer.

Any such termination shall be effective upon the giving of notice thereof by the
Buyer. Upon such termination,  the Buyer shall have no further obligation to the
Company  hereunder  and the Company  shall remain  liable for any breach of this
Agreement or the other documents  contemplated hereby which occurred on or prior
to the date of such termination.

               (l) Further Assurances. Each party to this Agreement will perform
any and all acts and  execute  any and all  documents  as may be  necessary  and
proper under the  circumstances  in order to accomplish the intents and purposes
of this Agreement and to carry out its provisions.

               (m) Public Statements,  Press Releases,  Etc. The Company and the
Buyer shall have the right to approve before  issuance any press releases or any
other public  statements with respect to the transactions  contemplated  hereby;
provided,  however,  that the  Company  shall be  entitled,  without  the  prior
approval of the Buyer, to make any press release or other public disclosure with
respect  to  such  transactions  as is  required  by  applicable  law or  Nasdaq
regulation  (although  the Buyer shall be consulted by the Company in connection
with any such press release or other public  disclosure prior to its release and
shall be provided with a copy thereof).

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


<PAGE>


               IN WITNESS WHEREOF,  this Agreement has been duly executed by the
Buyer and the  Company by their  respective  officers  or other  representatives
thereunto duly authorized on the respective dates set forth below.


NUMBER OF SHARES:  ________

PRICE PER SHARE:  $______

AGGREGATE PURCHASE PRICE:  $______

                        -------------------------------------

                                               By:



                                               Date:

                                               Address:  _______________________

                                               Facsimile No.:  _________________


                                               THERMOGENESIS CORP.



                                                    Name:
                                                    Title:

                                               Date:





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