March __, 1998
                         SPECIAL MEETING OF STOCKHOLDERS
                  OF CORTECH, INC. ("Cortech" or "the Company")

            ASSET VALUE FUND LIMITED PARTNERSHIP ("Asset Value (1)")
                        (a Delaware limited partnership)


     This Proxy  Statement  and the enclosed  white proxy card are being sent by
Asset Value on or about March *, 1998 in  connection  with its  solicitation  of
proxies at the Special Meeting being held by Cortech at ****Denver  time,  April
__, 1998 at ***************** ( the "Meeting"). At the Meeting, Cortech proposes
(1) to merge with  BioStar,  Inc.  ("BioStar"),  a company  located in  Boulder,
Colorado,  which is losing  money and has an  accumulated  deficit  of more than
($25,000,000)  (the  "Merger")  and (2) to reverse split  Cortech's  outstanding
shares of common stock ("Cortech Shares") * for * (the "Reverse Stock Split").

     Asset Value,  Cortech's largest  stockholder,  opposes the Merger but is in
favor of the Reverse Stock Split. Also at the Meeting, Asset Value proposes that
Cortech's  By-laws be amended to eliminate  the poison pill now in effect and to
prevent the  establishment  of another poison pill absent approval by a majority
of Cortech Shares.

     In  reliance  upon Rule  14a-5(c) of the  Securities  and  Exchange  Act of
1934(2),  reference is made to the proxy  statement dated March *, 1998 which is
being  sent  to you by  the  Company  for a  full  description  of  management's
proposals,  as well as information with respect to the number of shares eligible
to vote at the Meeting, the quorum, the record date, the securities ownership of
the Company,  information about the Company's officers and directors,  including
compensation  and the  same  information  about  BioStar  and its  officers  and
directors.


- ----------------
     (1) Asset Value is a Delaware limited  partnership which is wholly-owned by
Kent Financial  Services,  Inc., a Delaware  corporation  ("Kent") the shares of
which  are  publicly  traded  on  NASDAQ  under  the  symbol  KENT.   Additional
information about Asset Value and its management and about Kent and the names of
its  officers,  directors  and  controlling  stockholders  and  their  ownership
interests is presented on Schedule 1 of this Proxy Statement.

     (2) Rule  14a-5(c)  provides that "any  information  contained in any other
proxy  soliciting  material which has been furnished to each person solicited in
connection with the same meeting or subject matter may be omitted from the proxy
statement,  if a clear reference is made to the particular  document  containing
such information."





                  PLEASE READ THE FOLLOWING MATERIAL AS WELL AS
                  ---------------------------------------------
                     MANAGEMENT'S PROXY STATEMENT WITH CARE.
                     ---------------------------------------


                                   PROPOSAL 1

                            OPPOSITION TO THE MERGER


     In this Proxy  Statement we propose that  Cortech's  Merger with BioStar be
rejected because in our view:

         (1) the terms of the Merger do not maximize Cortech's value and in fact
the terms are unfair to Cortech's public stockholders and

         (2) the Board  misstates that  liquidation  is the only  alternative to
the Merger when in fact, if the poison pill were not in place, we  believe  that
Cortech would have had and could still have numerous  suitors better able to use
Cortech's cash and tax operating loss carryforwards ("NOLs").

     To  encourage  potential  suitors  besides  BioStar,  Asset  Value  is also
proposing  that  Cortech's  By-laws be  amended  to remove the poison  pill (See
Proposal 2 - Removal  of the Poison  Pill).  If the poison  pill is  eliminated,
Asset  Value or any other  investor  could buy up to 100% of Cortech  Shares and
could then effect a change in control of Cortech.  Asset Value has  declared its
current intention to seek the election of its nominees to Cortech's Board at the
upcoming annual meeting.

     A majority  of Cortech  Shares  voting at the Meeting is required to reject
the Merger or to amend the By-laws to eliminate  the poison pill.  (See Required
Vote and Manner of Voting).  Asset Value is also favoring  management's proposal
to amend the  Certificate  of  Incorporation  to effect the Reverse  Stock Split
which will  require  the  favorable  vote of a majority of  outstanding  Cortech
Shares.


           Mirror, Mirror on the Wall, Who's the Fairest of Them All?
           ---------------------------------------------------------- 

     Kenneth  Lynn,  CEO of  Cortech,  and his  hand-picked  Board would have us
believe that once they  determined  in April 1997 that Cortech could not succeed
as a stand-alone entity, they scoured the land for a merger partner and the only
prospective  suitor was BioStar,  a company  which lost almost  ($2,000,000)  in
fiscal  1997 and by the end of 1997 had a  negative  net worth of  ($5,600,000).
BioStar is so poor that  without  Cortech or another cash source it has only six
months to live.  On  December  31,  1997,  BioStar  had cash of  $1,281  and had
negative  working  capital  of  ($3,100,000).   According  to  Cowen  &  Company
("Cowen"), Cortech's financial advisor. BioStar's earning prospects are so scant
that one of Cortech's principal assets, approximately $77.2 million in NOLs, are
of little value to BioStar which has its own significant NOLs.  Because of this,
we believe that Cortech's NOLs were not a significant  factor in determining the
two  companies'  relative  valuation,  which we think worked to the detriment of
Cortech and to the benefit of BioStar. The result, in our view, is a Merger that
does not maximize Cortech's  stockholder value. So what is it about BioStar that
impressed Mr. Lynn  sufficiently to merge it with Cortech when, in our view, the
Cortech stockholders do not gain from the Merger?





                                     WARNING

     In our  opinion,  several  individuals  and  entities,  other then  Cortech
stockholders reap the benefits of the merger. We believe that Mr. Lynn stands to
benefit from the Merger because it triggers his golden parachute ($1,300,000 for
him and his  management  team) and  enables  him (and other  Board  members  and
executive  officers) to exercise 623,535 options.  Cortech's regular  attorneys,
Cooley  Goodward LLP  ("Cooley"),  stand to gain, in our view,  because they are
representing  BioStar  in the  Merger and will  remain  counsel to the  combined
entity. Cowen,  Cortech's purportedly  independent advisor, will benefit because
its fee of $250,000 soars to $400,000, an increase of 60%, only if the Merger is
consummated.  BioStar's management receives additional  compensation and options
in connection with the Merger and BioStar's Board receives  favorable  treatment
in the vesting and  exercise of its options.  In fact,  it seems to Asset Value,
that  every   participant   will  profit  from  the  Merger  except  the  public
stockholders  of  Cortech,  who will suffer a dilution in book value per Cortech
share  of 64%  (from an  historical  $.83 to a pro  forma  $.30)  while  BioStar
stockholders will enjoy an improvement in book value from an historical negative
($2.86) to a positive $.17 per share.

     We have read  carefully  the Joint Proxy  Statement/Prospectus  provided by
Cortech and BioStar,  including Cowen's so called fairness  opinion.  We ask the
Cortech Board:

           "PLEASE DISCLOSE WHAT YOU SEE IN THE HISTORY AND FINANCIAL
       STATEMENTS OF BIOSTAR THAT CHANGES IT FROM WHAT IS (IN OUR VIEW) AN
                      UGLY DUCKLING INTO A BEAUTIFUL SWAN"

 
                       BIOSTAR: RISING STAR OR BLACK HOLE
                       ----------------------------------

     It is not that we object to the Merger  because we think that  Cortech  has
been a glittering star. On the contrary,  Cortech's management,  in our opinion,
exercised poor judgment in not  aggressively  downsizing to preserve cash as the
failure to commercialize  Cortech's  technology became evident. But look at what
we see as the dark side of BioStar  (and this list does not purport by any means
to be complete):

     . BioStar lost almost ($2  million) in fiscal 1997,  has never had earnings
       in any year and projects no earnings for the immediate future.

     . BioStar has an  accumulated  deficit of over ($25 million) and a negative
       net worth of more than ($5.6 million).

     . BioStar has short and long term debt totaling over $9.4 million.

     . BioStar's  cash flow has been  almost  totally  dependent  on third party
       funding,  and  even  with  Cortech's  cash,  BioStar has no more than two
       years to live without additional funding.




                                                  
 

                                RUSH TO JUDGMENT

     The Cortech Board states that after  spending most of 1997  evaluating  the
merits of potential strategic transactions,  the Board concluded that BioStar is
the best  Cortech  can do and that  Cortech's  only  alternative  to  BioStar is
liquidation.  In  reality,  we  believe  that the  Board  has no  basis  for its
conclusion  that Cortech is such a wallflower.  In our opinion,  the Board never
took even one step that could have seriously exposed Cortech to the marketplace.
It did not eliminate  the poison pill;  it did not engage an investment  banker;
and it did not  advertise  that  Cortech  was up for bid.  Here are other  facts
which, in our view, make the Board's contentions not credible:

     1. Cortech's management failed to elect Asset Value's representative to the
Board so that he could  participate  in the process of ferreting  other possible
deals, even though Lynn conceded that he knew that Asset Value's  representative
was a "shrewd investor."

     2. Cortech only engaged an investment  banker after the terms of the Merger
had been set.

     3. The Cortech  Board did not request that Cowen  solicit other parties who
might be interested in a deal for Cortech,  and actually  discouraged Cowen from
considering other potential  suitors by making a significant  portion of Cowen's
fee dependent upon the success of this Merger.

     In evaluating  the  truthfulness  of the purported  reasons for the Board's
support of the Merger, we ask that you consider these facts:

     . Cortech says that it was  aggressively  pursuing  strategic  alternatives
       during  most of  1997. BioStar says that it had been seeking a deal since
       February of 1997.  BioStar  operates  within  miles of  Cortech  and both
       companies are represented by the same law firm.  IT IS NOT CREDIBLE TO US
       THAT CORTECH WAS UNAWARE OF BIOSTAR UNTIL OCTOBER OF 1997.
                                                             
     . What made the money losing BioStar suddenly appear attractive to Cortech,
       one of  whose  principal  assets were  significant  NOLs? In our view the
       answer  is  simple and  obvious.  Paul  Koether  of Asset  Value met with
       Lynn on October 22, 1997, and on October 23, 1997, Lynn was  "introduced"
       to the CEO of BioStar by Cooley, their mutual regular counsel.


                           THE FOX IN THE CHICKEN COOP
 
     Lynn proceeded to negotiate the terms of the Merger without  benefit of the
presence of its special counsel, a non-management  Board member or an investment
banker, although  he  purportedly kept them informed.  Meanwhile we believe that
BioStar  benefitted  in  the  negotiations  by  the  presence of  its investment
banker, Lehman Brothers, Inc., and its counsel, Cooley, which as we have already
noted was the  regular  counsel of Cortech  and  presumably  continued  to be an
attorney trusted by Lynn.



     In our view,  given the  benefits  they will  receive,  none of the Cortech
officers and  directors are  independent  in this  transaction;  of all of them,
however,  we believe that the least independent and the most conflicted is Lynn,
the very individual who was entrusted by the Board to negotiate the terms of the
Merger.
 
                WOULD THE GODS GIVE US THE GIFT TO SEE OURSELVES
                ------------------------------------------------
                              AS OTHERS SEE US(3)
                              ------------------

     Lynn has described  himself in this transaction as a "fiduciary".  Far from
it in our view.  Prior to the Merger,  Lynn owned Cortech Shares worth less than
$2,000 in the  marketplace.  As a result of the Merger,  Lynn and his management
team will  receive:  (1)  payments of  $1,300,000;  (2) payment of premiums  for
health benefits for eighteen  months;  and (3) the immediate  vesting of 623,535
options. Mr. Lynn will also continue as a director of the successor  corporation
after the Merger.

     We believe that Mr. Lynn  negotiated  the terms of the Merger with apparent
disregard for stockholders' interests much like, in our view, he has ignored the
growing  disparity  over the past several  years  between his  interests and the
public stockholders'  interests. The chart below reflects the difference between
Mr. Lynn's  increasing  compensation  between 1993 and 1997 and the  concomitant
decline of the market value of Cortech Shares.





                 GRAPH OF CORTECH'S HIGH STOCK PRICE AND LYNN'S
                                  COMPENSATION.

                                       1993        1994       1995       1996        1997
                                      ------      ------     ------     ------      ------
                                                                     
Cortech's High Stock Price            $18.25      $14.25     $3.65625    $3.8125    $2.03125 
Lynn's Compensation                   $140,000    $181,744   $305,499    $330,006   $330,513






                              NOT A PRETTY PICTURE!

 ------------------
     (3) An  anglicized  version  of a  quotation  from the poem "To a Louse" by
Scottish poet Robert Burns.
                                                        





     But the rejection of the Merger alone will not get Lynn out of the picture.
That is why we are proposing  amendments  to Cortech's  By-laws to eliminate the
poison pill so that potential  investors or strategic partners may be encouraged
to purchase  additional Cortech Shares and eventuate a change in control.  Asset
Value has stated and restates  here that it has no potential  merger  partner in
mind and will not merge  Cortech  with an Asset  Value  affiliate.  Asset  Value
believes  it stands  to gain from any  future  acquisition  or Merger  involving
Cortech only to the extent all stockholders benefit. We ask you to join us and


                             VOTE NO TO THE MERGER!

      If You Have Supported Management, Now Is the Time To Change Your Mind
      ---------------------------------------------------------------------
 
    Even if you have  executed  management's  ***** proxy card,  you can change
your vote by signing,  dating and returning the enclosed white proxy card in the
postage paid envelope provided. Any proxy, including one we hold, can be revoked
(see "Revocation of Proxies").


                                   PROPOSAL 2

                           REMOVAL OF THE POISON PILL

     Whatever the  purported  justification  for  establishing  a poison pill in
general,  in this case we believe it has served only to prevent  competition for
the control of Cortech.  Once the Board determined to transfer  control,  in our
opinion,  the  Board  should  have  removed  the pill and  permitted  unfettered
purchases of Cortech  Shares.  In fact,  Asset Value asked the Cortech  Board to
remove  the pill so that  Asset  Value or any  other  potential  investor  could
purchase more than 15% of the outstanding Cortech Shares. Such a step might have
induced  another  suitor or enabled  the Company to secure  better  terms in the
Merger by increasing the market value of Cortech Shares. Instead, we believe the
Board has used the pill to  insulate  the Company  from any  suitors  other than
BioStar in a Merger which we believe serves  management's  interests rather than
the maximization of stockholder values.
 
         "WHO CARES WHAT OWNERS THINK? Who owns American companies? The
    management, of course. Shareholders are tolerated, but managers rule.(4)"
 
     

- -----------------
     (4) Market Watch, New York Times, 3/8/98, Floyd Norris. This quote has been
made without the permission of the New York Times or Mr. Norris.
                                                        



     Not once has a director or officer of Cortech  sought the advice or opinion
of Asset Value, Cortech's largest stockholder,  about the Merger. Not once did a
Cortech  director or officer seek the cooperation of Asset Value to avoid,  what
in our view, is the senseless costs of this ill-fated merger proposal even after
Asset Value expressed its opposition in a letter to Mr. Lynn.

     There  can  be  no  justification  for  the  expenditure  of  approximately
$3,000,000  (20% of  Cortech's  net worth) on what we believe is a  self-serving
merger,  without  consulting  Asset  Value,  who,  in our view,  represents  the
position of the public stockholders.  Unfortunately, no matter what the outcome,
we the  stockholders  will pay the costs of what we consider the sheer arrogance
of Cortech's management and directors.


              THIS BOARD ACTS LIKE THEIR VOICE IS THE ONLY CHOICE.

     But we  stockholders  can  demonstrate  that they are wrong. We urge you to
join us in voting against the Merger and for the removal of the poison pill.


                                   PROPOSAL 3

                             THE REVERSE STOCK SPLIT

     Asset Value favors the Reverse Stock Split because it may enable Cortech to
retain its NASDAQ  listing.  In fact,  Asset Value believes that Cortech's Board
was negligent in not taking this step sooner.


                              VOTE NO TO THE MERGER


                       VOTE YES TO REMOVE THE POISON PILL


                       VOTE YES TO THE REVERSE STOCK SPLIT




                       REQUIRED VOTE AND MANNER OF VOTING
                       ----------------------------------

     If more than a  majority  of Cortech  Shares  present by proxy or in person
vote against the Merger and in favor of amending  the By-laws to  eliminate  the
Poison Pill, the Merger will be rejected and the Poison Pill will be eliminated.
If more than a majority of outstanding Cortech Shares vote for the Reverse Stock
Split, this proposal will be approved. Valid proxies will be voted as instructed
therein,  but absent instructions on the white proxy card, will be voted AGAINST
the Merger and FOR the removal of Poison  Pill and FOR the  Reverse  Stock Split
and in the  discretion  of the proxies on any other matter that comes before the
Meeting  which was not known a reasonable  time before the Meeting.  Abstentions
and broker  non-votes (where a nominee holding shares for a beneficial owner has
not  received  voting  instructions  from the  beneficial  owner on a particular
matter  and the  nominee  does not  vote  the  shares)  will be  counted  in the
determination  of a quorum but will not be counted for or against any  proposal.
We urge you to sign,  date and  return  the  white  proxy  card in the  enclosed
envelope. No postage is required if mailed in the United States.


                              SHARES IN STREET NAME

     If you hold your  Cortech  Shares in the name of a brokerage  firm or bank,
your broker or banker cannot vote the Shares until the broker or banker receives
specific  instructions  from you. Please contact the party at the brokerage firm
or bank  responsible  for your account to make sure that a proxy is executed for
your Cortech Shares on the white proxy card.


                              REVOCATION OF PROXIES

     If you have executed  management's  **** proxy card before  receiving  this
Proxy Statement, you have every right to change your vote by signing, dating and
returning the enclosed white proxy card in the postage-paid  envelope  provided.
Only your latest dated proxy will count at the Meeting. Any proxy, including the
proxy  solicited  hereby,  may be revoked at any time  before it is voted by (i)
submitting a duly  executed  proxy  bearing a later date to the Secretary of the
Company or to Asset  Value,  (ii)  filing  with the  Secretary  of the Company a
written revocation or (iii) attending and voting at the Meeting in person.


                              SOLICITATION EXPENSE

     Asset Value,  Mark W. Jaindl and  Frederick J. Jaindl (see Schedule 1) will
bear the cost of preparing,  assembling  and mailing the enclosed form of proxy,
this proxy  statement and other  material which may be sent to  stockholders  in
connection with this solicitation. Officers and regular employees of Asset Value
or its affiliates may solicit proxies by mail, telephone, telegraph and personal
interview, for which no additional compensation will be paid. In addition, Asset
Value has retained Beacon Hill Partners,  Inc. to solicit proxies on its behalf.
It is  anticipated  that  the  cost to  Asset  Value  in  connection  with  this
solicitation  will be approximately  $50,000,  including  approximately  $15,000
payable to Beacon Hill Partners, Inc.


                                         Very truly yours,



                                         /s/ Paul O. Koether
                                         --------------------------
                                         Paul O. Koether
                                         Asset Value Fund Limited Partnership

                                                       




                                    IMPORTANT

     If your shares are held in "Street  Name" only your bank or broker can vote
your shares, and only upon receipt of your specific instructions. Please contact
the person  responsible  for your account and  instruct  them to execute a white
proxy card as soon as possible.

     If you have any questions or need further assistance in voting, please call
John W. Galuchie,  Jr., of Asset Value Fund Limited Partnership collect at (908)
234-1881, or our proxy solicitor:


                           BEACON HILL PARTNERS, INC.
                                 90 BROAD STREET
                            NEW YORK, NEW YORK 10004
                                 (800) 253-3814






                                             
                                                                  SCHEDULE 1



              ADDITIONAL INFORMATION ABOUT ASSET VALUE FUND LIMITED
               PARTNERSHIP, MARK W. JAINDL AND FREDERICK J. JAINDL

 
     Asset  Value  Fund  Limited  Partnership  ("Asset  Value")  is  engaged  in
investing in securities.  The sole general partner of Asset Value is Asset Value
Management,  Inc.  ("Asset  Value  Management").  Asset  Value  Management  is a
wholly-owned  subsidiary  of  Kent  Financial  Services,  Inc.  ("Kent"),  whose
principal business is the operation of T.R. Winston & Company, Inc. ("TRW"), its
wholly-owned  subsidiary.  TRW is a securities broker-dealer registered with the
National  Association  of  Securities  Dealers,  Inc.  Asset Value,  Asset Value
Management,  Kent and TRW maintain offices at 376 Main Street,  Bedminster,  New
Jersey  07921.

     Mark W. Jaindl ("Mark Jaindl") is the President and Chief Executive Officer
of the American Bank of the Lehigh  Valley,  a commercial  bank whose  principal
business  address is 4029 West Tilghman Street,  Allentown,  PA 18104 ("American
Bank"). Mark Jaindl is a director of Pure World, Inc., which may be an affiliate
of Asset Value by virtue of the common  stock  ownership of Kent and Pure World,
Inc.  by Paul O.  Koether.  Frederick  J.  Jaindl  ("Fred  Jaindl")  is the sole
proprietor of Jaindl Farms (turkey farming), whose principal business address is
3150 Coffeetown Road,  Orefield,  PA 18069.  Fred Jaindl is Chairman of American
Bank. Mark and Fred Jaindl are the principal stockholders of American Bank. Mark
Jaindl is the son of Fred Jaindl.

     As of March  23,  1998  Asset  Value  holds  2,000,000  Cortech  Shares  or
approximately 10.80% of the total Cortech Shares outstanding.  Mark Jaindl holds
250,000 Cortech  Shares,  or  approximately  1.35% and Fred Jaindl holds 520,000
Cortech Shares or approximately  2.80%. Asset Value, Mark Jaindl and Fred Jaindl
disclaim the beneficial ownership of each other's Cortech Shares.  Purchases and
sales of Cortech  Shares by Asset Value,  Mark Jaindl and Fred Jaindl are listed
on Schedule 2.

     During the past ten years, none of Asset Value,  Mark Jaindl,  Fred Jaindl,
Asset Value  Management,  Kent, TRW, or the Directors and Executive  Officers of
Kent has been convicted in a criminal proceeding.









                            DIRECTORS AND EXECUTIVE OFFICERS
                            OF KENT FINANCIAL SERVICES, INC.

                                                                 Percent of Direct or
                                                                  Indirect Ownership
 Name and Address                 Position and Office          of Voting Securities of
of Beneficial Owner               Currently Held            Kent Financial Services, Inc.
- -------------------               -------------------       -----------------------------
                                                               
Paul O. Koether                   Chairman, Director                 44.90%
 211 Pennbrook Road                and President
 Far Hills, NJ 07931

John W. Galuchie, Jr.             Vice President and
  376 Main Street                  Treasurer                          2.32%
 Bedminster, NJ 07921

Mark Koscinski                    Vice President                         *
  376 Main Street
  Bedminster, NJ 07921

M. Michael Witte                  Director                            1.15%
 1120 Granville Avenue
 Suite 102
 Los Angeles, CA 90049

Casey K. Tjang                    Director                               *
 56 Hall Drive
 Clark, NJ 07066

Mathew E. Hoffman                 Director                               *
 62 Rosehill Avenue
 New Rochelle, NY 10804
_________________________________________
*Less than 1 percent
 













                                                                      SCHEDULE 2


                               PURCHASES AND SALES OF CORTECH SHARES

ASSET VALUE<F1>

Dates purchased     Number of shares purchased     Price per share<F2>         Total
- ---------------     --------------------------     ------------------     -------------
                                                                  
07/25/97                     20,000                   $ .61375            $   12,275.00
07/31/97                      6,700                     .625                   4,321.50
08/06/97                      9,100                     .6875                  6,256.25
08/07/97                      2,600                     .6875                  1,787.50
08/08/97                      3,100                     .6875                  2,131.25
08/12/97                    458,500                     .6875                315,218.75
08/15/97                      5,100                     .6875                  3,506.25
08/18/97                      5,200                     .6689                  3,478.28
08/19/97                      3,200                     .65625                 2,100.00
08/20/97                      9,000                     .65625                 5,906.25
08/21/97                      8,500                     .6875                  5,843.75
08/27/97                    146,800                     .6875                103,861.00
09/08/97                     22,000                     .6875                 15,125.00
09/11/97                     20,000                     .703125               14,062.50
09/15/97                     26,000                     .703125               18,281.25
09/16/97                      7,700                     .703125                5,414.06
09/17/97                      4,000                     .703125                2,812.50
09/24/97                     31,425                     .703125               22,095.70
09/30/97                     89,600                     .703125               63,000.00
10/01/97                     56,000                     .703125               39,375.00
10/02/97                      1,475                     .703125                1,037.11
10/06/97                     25,000                     .6875                 17,187.50
10/07/97                      2,000                     .6875                  1,375.00
10/07/97                      6,500                     .71875                 4,671.88
10/07/97                    336,000                     .703125              236,250.00
10/08/97                  1,556,757                     .65                1,011,892.05
10/08/97                      5,000                     .75                    3,750.00
10/08/97                     20,000                     .71875                14,375.00
10/09/97                      2,000                     .71875                 1,437.50
10/09/97                      5,000                     .765625                3,828.13
10/09/97                     18,500                     .75                   13,875.00
10/10/97                      4,500                     .78125                 3,515.63
10/14/97                      1,000                     .78125                   781.25
10/14/97                      6,000                     .8125                  4,875.00
10/28/97                     15,000                     .6875                 10,312.50
10/30/97                     13,000                     .6875                  8,937.50
10/30/97                     12,000                     .65625                 7,875.00
11/03/97                      3,700                     .6875                  2,543.75
11/04/97                      4,900                     .65625                 3,215.63
11/05/97                     12,000                     .6875                  8,250.00
11/05/97                      2,500                     .65625                 1,640.63
11/07/97                     11,300                     .65625                 7,415.63
11/10/97                     58,343                     .65625                38,287.59
11/11/97                     10,500                     .65625                 6,890.63


                                                         (table continued on next page)
 

   

(table continued from previous page)


Dates purchased     Number of shares purchased     Price per share<F2>         Total   
- ---------------     --------------------------     ------------------     -------------
11/14/97                      4,000                     .65625                 2,625.00 
11/14/97                      8,500                     .6875                  5,843.75
11/17/97                      9,700                     .65625                 6,365.63
11/18/97                     11,300                     .65625                 7,415.63
11/24/97                      5,000                     .640625                3,203.13
                          ---------                                       ------------- 
                          3,106,000                                       $2,086,524.84
                          ---------                                       -------------



Dates sold          Number of shares sold          Price per share<F2>         Total   
- ----------          ---------------------          ------------------     -------------
08/13/97                      3,000                   $ .6875             $    2,062.43
08/29/97                      3,000                     .71875                 2,156.17
09/17/97                      2,000                     .71875                 1,437.45
09/30/97                      3,000                     .71875                 2,156.17
10/07/97                    325,000                     .65                  211,242.95
02/10/98                    770,000                     .6705                516,285.00
                          ---------                                       -------------
                          1,106,000                                          735,340.17<F3>
                          ---------                                       -------------
                          2,000,000                                       $1,319,425.00
                          =========                                       =============


 
MARK W. JAINDL
- --------------

Dates purchased     Number of shares purchased     Price per share<F2>         Total
- ---------------     --------------------------     ------------------     -------------   
02/10/98                    250,000                     .6705             $  167,625.00
                         ==========                                       ============= 





FREDERICK J. JAINDL
- -------------------

Dates purchased     Number of shares purchased     Price per share<F2>         Total
- ---------------     --------------------------     ------------------     -------------   
02/10/98                    520,000                     .6705             $  348,660.00
                         ==========                                       =============



<FN>



<F1>    Excludes  the  purchase for an aggregate amount of $11,251.52 on October
8, 1997 of warrants  to purchase  562,576  shares of Cortech  stock,  which were
contributed  back to the capital of Cortech on October 18, 1997.  No shares were
purchased with or are being held with borrowed funds.

<F2>    Price excludes brokerage commissions, if any.

<F3>    Reflects loss on sale of $31,759.67.


                                                            
</FN>




PRELIMINARY PROXY CARD

                                  Cortech, Inc.
                   Special Meeting To Be Held On [date], 1998

                     This Proxy Is Being Solicited On Behalf
             Of Asset Value Fund Limited Partnership ("Asset Value")

     The undersigned hereby appoints Paul O. Koether, Mark W. Jaindl and John W.
Galuchie, Jr. or either of them, the undersigned's proxies, each with full power
of  substitution,  to vote all  Shares of Common  Stock of  Cortech,  Inc.  (the
"Company") which the undersigned would be entitled to vote if personally present
at the Special Meeting of Stockholders of the Company to be held on [date], 1998
at **A.M. at  **************************************  (the "Meeting") and at any
adjournments or  postponements  thereof and,  without limiting the generality of
the power hereby conferred,  the proxy nominees named above and each of them are
specifically directed to vote as indicated below.

     WHERE A CHOICE IS INDICATED,  THE SHARES  REPRESENTED BY THIS PROXY WILL BE
VOTED AS SPECIFIED.  IF NO CHOICE IS INDICATED,  THE SHARES  REPRESENTED BY THIS
PROXY WILL BE VOTED  AGAINST THE MERGER,  FOR THE  PROPOSAL TO REMOVE THE POISON
PILL AND FOR THE PROPOSAL TO APPROVE THE REVERSE STOCK SPLIT.
 
     If there are  amendments  or  variations  to the  matters  proposed  at the
Meeting  or at any  adjournments  or  postponements  thereof,  or if  any  other
business  properly  comes before the Meeting,  this proxy confers  discretionary
authority  on the proxy  nominees  named herein and each of them to vote on such
amendments, variations or other business.

ASSET VALUE RECOMMENDS A VOTE AGAINST THE MERGER
1.   To approve the merger of Cortech, Inc. and BioStar, Inc.

           _____FOR              _____AGAINST              _____ABSTAIN

ASSET VALUE RECOMMENDS A VOTE FOR THE REMOVAL OF THE POISON PILL
2.    To amend the Company's By-laws to remove the poison pill.

           _____FOR              _____AGAINST              _____ABSTAIN

ASSET VALUE RECOMMENDS A VOTE FOR THE REVERSE STOCK SPLIT
3.    To  approve  the  Reverse  Stock  Split  by  amending  the  Certificate of
      Incorporation.

           _____FOR              _____AGAINST              _____ABSTAIN

4.    In their discretion, on such other matters as may properly come before the
      special meeting or any postponements or adjournments thereof.

     The undersigned  acknowledges  receipt of the accompanying Notice of Annual
Meeting of  Stockholders  and Proxy  Statement for the  _________________,  1998
meeting.


                                Dated: _________________________________, 1998

                                ______________________________________________ 
                                Signature of Stockholder

                                                             

                                ______________________________________________
                                Signature of Stockholder if Shares held  in more
                                than one name  (Please sign  exactly  as name or
                                names appear hereon.   Full title of one signing
                                in  representative  capacity  should  be clearly
                                designated after  signature.   If a corporation,
                                please sign in  full corporate name by President
                                or other authorized officer(s).  If  a  partner-
                                ship,   please   sign  in  partnership  name  by
                                authorized  person.   If stock is in the name of
                                two or more  persons, each  should  sign.  Joint
                                owners  should  each  sign.  Names  of all joint
                                holders should be written even if signed by only
                                one.)


  ASSET VALUE RECOMMENDS A VOTE AGAINST PROPOSAL 1 AND FOR PROPOSALS 2 AND 3.


  PLEASE  PROMPTLY COMPLETE,  DATE, SIGN AND MAIL THIS PROXY IN THE ENCLOSED
  POSTAGE-PAID ENVELOPE.