EXHIBIT 10(aa)

                        ENZO DIAGNOSTICS, INC. - DAKO A/S
                            DISTRIBUTORSHIP AGREEMENT

THIS AGREEMENT, effective upon acceptance by both parties below by and between
ENZO DIAGNOSTICS, INC. ("ENZO"), a New York corporation having its principal
place of business at 60 Executive Boulevard, Farmingdale, New York 11735, and
DAKO A/S ("DAKO") a private Danish Corporation having its principal place of
business at Produktionsvej 42, DK-2600 Glostrup, Denmark and its American
subsidiary, DAKO CORPORATION a California corporation having its principal place
of business at 6392 Via Real, Carpinteria, California 93013.

     WHEREAS, ENZO owns rights to certain patents and patent applications listed
     in EXHIBIT A ("PATENTS");

     WHEREAS ENZO manufactures and/or sells certain products, including products
     covered by claims of PATENTS ("PRODUCTS") listed in EXHIBIT B and products
     not covered by claims of PATENTS listed in EXHIBIT C;

     WHEREAS DAKO wishes to market and distribute some of said PRODUCTS listed
     in EXHIBIT B and products listed in EXHIBIT C as agreed upon;

     NOW, THEREFORE, in consideration of the good and valuable mutual agreements
     hereinafter set forth, the parties hereto agree as follows:

DEFINITIONS:

DAKO Affiliate means an entity controlled by or under common control with DAKO
     as listed in EXHIBIT D. For purposes of this AGREEMENT, control shall mean
     the ownership of a majority of the voting equity interest.

DAKO Distributor means a local company, outside the countries in which a DAKO
     Affiliate is located, in which DAKO does not sell directly or through a
     DAKO Affiliate. Dako Distributors listed in EXHIBIT D have rights to sell
     only in the country in which they are located.

DAKO means DAKO A/S, including DAKO Affiliates and DAKO Distributors.

1.   Distributor Appointment

     ENZO hereby appoints DAKO to act as its nonexclusive distributor worldwide
     for the distribution and sale of such PRODUCTS (EXHIBIT B) and products
     (EXHIBIT C) as agreed upon, and DAKO agrees to act as such distributor
     under the terms and conditions set forth herein.
    

   
     DAKO hereby agrees:

          a.   not to purchase any PRODUCTS from other suppliers;

          b.   not to manufacture PRODUCTS;

          c.   to rely on ENZO as its sole source of PRODUCTS;

          d.   not to use any PRODUCT to manufacture new or other PRODUCTS;

          e.   that all PRODUCTS distribributed by DAKO are for research use
               only and are not intended for or to be used for diagnostic or
               therapeutic purposes; and

          f.   that except for DISTRIBUTION under the terms and conditions as
               set forth in this AGREEMENT, purchase does not include any right
               or license to exploit these PRODUCTS commercially, including any
               right to sell these PRODUCTS to other distributors who are not
               DAKO Affiliates or DAKO Distributors (EXHIBIT D) and that any
               other commercial use or development of these PRODUCTS without the
               express written authorization of ENZO is strictly prohibited.

2.   Relationship between ENZO and DAKO

     Nothing herein creates or constitutes a partnership or an agreement of
     agency between the parties with respect to any activities whatsoever. The
     relationship between ENZO and DAKO shall be that of seller and buyer, and
     neither party shall conclude any contract or agreement or make any
     commitment, representation or warranty which binds the other party or
     otherwise act in the name of or on behalf of the other party.

     This AGREEMENT may not be assigned or otherwise transferred by DAKO without
     the prior written consent of ENZO. Any attempted assignment or transfer
     without such consent shall be void.

     DAKO certifies that past sales of PRODUCTS as of * were * . A one-time
     payment of * will constitute full consideration for damages of past
     infringement.

     ENZO and DAKO agree that the distribution relationship between them does
     not constitute, nor does it imply, a license of any of ENZO's technology or
     patents, nor does it abrogate any of ENZO's rights under its patents. ENZO
     maintains full rights under its PATENTS. The foregoing statements are
     paramount to this AGREEMENT.

- ----------
*    The information omitted is confidential and has been filed separately with
     the Commission pursuant to Rule 406.
    

                                        2

   
3.   PRODUCTS and Price and Payment

     PRODUCTS covered by this AGREEMENT are listed in EXHIBIT B and EXHIBIT C
     attached hereto. The price to DAKO for each product shall be * times the
     current domestic (i.e. United States) retail price as reflected by the
     prices in ENZO's most recently published price list.

                                  *

     The current domestic retail prices at the time of execution of this
     AGREEMENT are listed in EXHIBIT B and EXHIBIT C. Prices to DAKO may be
     adjusted no more than once during a calendar year. ENZO has the right to
     adjust prices to DAKO after providing DAKO with forty-five (45) days
     written notice. Any price adjustment will affect future purchases, but will
     not affect those already under existing firm purchase order commitment.

     ENZO or DAKO may propose in writing to add, to modify or to delete PRODUCT
     or products in EXHIBIT B or EXHIBIT C. Both ENZO and DAKO must agree in
     writing to such additions, deletions or modifications of PRODUCTS in
     EXHIBITS B or C before such changes are incorporated therein.

4.   Terms of Payment and Audit

     Payment shall be net, thirty (30) days from the end of the month in which
     the PRODUCTS are delivered.

                        *

5.   PRODUCT Shipments

     All PRODUCTS shipped by ENZO to DAKO will be shipped F.O.B. Farmingdale,
     NY.

6.   Forecasts and Purchase Orders

     DAKO shall issue a forecast schedule during the mid-month of each calendar
     quarter covering its estimated requirements for PRODUCTS for the succeeding
     two (2) calendar quarters. Such forecast shall be considered for planning
     purposes only and not a purchase commitment.

     A purchase order will be issued by DAKO at least sixty (60) days in advance
     of the requested delivery of PRODUCT. This purchase order will indicate
     specific delivery and/or shipping requirements. Purchase orders will be
     delivered to ENZO by Federal Express or similar carrier so

- ----------
*    The information omitted is confidential and has been filed separately with
     the Commission pursuant to Rule 406.
    

                                        3


   
     that the receipt can be confirmed. ENZO shall meet such requirements unless
     it advises DAKO within * of the date of such purchase order that it is
     unable to supply PRODUCT as ordered by DAKO whereupon the parties agree to
     discuss a revised schedule for delivery of PRODUCT to DAKO. After ENZO and
     DAKO agree to the provisions of a revised schedule, ENZO will make its best
     efforts to fulfill the provisions of the revised schedule.

     Each purchase order shall be governed by the relevant provisions of this
     AGREEMENT (unless otherwise expressly provided in the individual purchase
     order and confirmed in writing by ENZO) and no term or condition which may
     appear in the printed matter in DAKO's order form or any form from ENZO
     shall be binding on either party or apply to any transaction under this
     AGREEMENT.

7.   PRODUCT Deliveries and Specifications

     Within thirty (30) days after the effective date of this Agreement, ENZO
     shall provide DAKO with PRODUCT specifications and package inserts for
     those PRODUCTS in EXHIBIT B that DAKO intends to distribute.

     When an order is placed by DAKO, ENZO shall ship the PRODUCT in accordance
     with Section 5 above. Failure by DAKO to notify ENZO of rejection of the
     PRODUCT within * of receipt of PRODUCT will constitute acceptance. ENZO
     shall supply, at the time of shipment of the PRODUCT to DAKO, a statement
     that the PRODUCT conforms to the PRODUCT specifications. If after receipt
     of the PRODUCT, DAKO determines that it does not conform to the PRODUCT
     specification provided by ENZO, and that the failure to conform to the
     PRODUCT specifications was not the direct result of shipping and handling,
     DAKO will provide ENZO with documentation of this failure to conform to the
     PRODUCT specifications. If ENZO accepts the documentation provided by DAKO,
     ENZO will ship a replacement order. If ENZO does not accept the
     documentation provided by DAKO, then the differences in the determination
     of the manufacturing specifications for the allegedly nonconforming PRODUCT
     will be settled by representatives of the technical staffs of ENZO and
     DAKO.

     If DAKO receives a notice from a third party asserting that any of the
     PRODUCTS of this AGREEMENT infringe on an issued patent in the country of
     sale, then DAKO shall immediately give written notice to ENZO. Upon notice
     to ENZO or DAKO from a third party asserting that any of the PRODUCTS of
     this AGREEMENT infringe on an issued patent in the country in which such
     PRODUCTS are sold, ENZO has the right to exclude such PRODUCTS from this
     AGREEMENT for that country and can further instruct DAKO to cease all such
     distribution of such PRODUCT in that country. Further distribution of
     PRODUCTS after such instruction from ENZO to DAKO will be at the sole risk
     of DAKO and DAKO shall indemnify and hold harmless ENZO from all
     infringement liability and damages with respect to such PRODUCTS, including
     legal costs and attorneys fees.

     Notwithstanding any third party infringement claims, all provisions of this
     AGREEMENT, including Section 7, shall not be affected but shall remain in
     full force and effect to the fullest extent possible.

- ----------
*    The information omitted is confidential and has been filed separately with
     the Commission pursuant to Rule 406.
    

                                        4


   
8.   Sales Promotions

     DAKO shall exert on its own account, its best efforts in sales promotions
     and advertisement of the PRODUCTS such as individual client contact, direct
     mailings, catalog listings and trade meeting promotions. ENZO will provide
     DAKO with one (1) copy of the literature, technical data, specifications
     and the like describing the PRODUCTS that DAKO is distributing as they are
     currently produced for the assistance of DAKO in the preparation of
     advertising, catalog and other sales and promotional material. DAKO will
     list PRODUCTS in its next available or published product catalog(s) in
     which the PRODUCTS can be listed after the effective date of this
     Agreement. DAKO will modify the listings of PRODUCTS in its product
     catalog(s) as soon as reasonably possible after any corresponding
     modification of the list of such PRODUCTS in EXHIBIT B and EXHIBIT C that
     it intends to distribute.

9.   PRODUCT Warranty

     ENZO warrants that the PRODUCTS manufactured by ENZO for distribution by
     DAKO shall meet the specifications described in ENZO's PRODUCT or package
     inserts. ENZO's sole obligation is to replace the PRODUCTS with similar
     PRODUCTS to the extent of the purchase price. THIS WARRANTY IS EXPRESSLY IN
     LIEU OF ANY OTHER WARRANTIES OR LIABILITIES, EXPRESS OR IMPLIED, INCLUDING
     THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

10.  Storage and Stock Rotation

     ENZO agrees to share with DAKO all necessary storage and stock rotation
     practices which apply to the PRODUCTS.

     DAKO further agrees to take diligent care not to ship PRODUCTS to its
     customers which have expired, been damaged in storage or handling, or
     improperly stored. DAKO will be responsible for damages arising from its
     shipment of expired, damaged, or improperly stored PRODUCTS.

11.  PRODUCT Labels

     All PRODUCTS will be labeled with the ENZO DIAGNOSTICS, INC. label. DAKO
     further agrees to ship all PRODUCTS intact with ENZO's package inserts and
     any notice(s) appearing thereon.

12.  Confidentiality of Information

     DAKO and ENZO agree that they will not disclose any proprietary and
     confidential information made available to them by the other party. Both
     parties further agree that all confidential material will be in writing and
     marked confidential and that they will not make more copies than necessary
     of documents or materials which are provided under this AGREEMENT, nor will
     they distribute such documents or materials, or copies thereof, to any
     third party. Furthermore, both parties agree to return any such documents
     or materials, or copies thereof, which are provided under this AGREEMENT if
     directed or requested to do so.
    

                                        5

   
     The above obligations shall not apply to those portions of ENZO's and
     DAKO's proprietary and confidential information which (1) are or become
     generally publicly available through no act or failure to act by the
     recipient party, (2) were demonstrably known to both parties prior to
     disclosure under this Agreement, or (3) are subsequently disclosed by a
     third party having a legal right to do so and not having a confidential
     relationship with respect thereto.

13.  Force Majeure

     NO LIABILITY shall result to either party from delay in performance or from
     nonperformance under this Agreement caused by circumstances beyond the
     control of the party who has delayed performance or not performed. The
     nonperforming party shall be diligent in attempting to remove any such
     cause and shall promptly notify the other party of its extent and probable
     duration.

14.  Duration and Termination

     This AGREEMENT shall become effective as of the date hereinabove written
     and shall continue for * . Unless terminated, it will continue thereafter
     for successive renewal terms of * . Either party may terminate this
     AGREEMENT without cause at any time by giving the other party notice in
     writing at least * in advance of the effective termination date stated in
     such notice.

     Upon termination of this AGREEMENT all distribution rights to DAKO will be
     deemed immetiately canceled and returned in toto to ENZO.

15.  Indemnification

     Except to the extent the other is negligent or commits an act of wilful
     misconduct or in default of the terms hereof, ach party shall hold the
     other party harmless from responsibility or liability for damages related
     to the PRODUCTS of this AGREEMENT arising from the fault of such party, its
     affiliated companies, or its agents or employees.

16.  Notices

     All notices to be given with respect to this AGREEMENT shall be in writing
     and shall be deemed effectively given:

     when delivered personally;

     seven (7) calendar days after being deposited in the mail, registered or
     certified mail, return receipt requested;

     when telecopied or faxed, receipt acknowledged; or

     when telexed, confirmed;

- ----------
*    The information omitted is confidential and has been filed separately with
     the Commission pursuant to Rule 406.
    

                                        6

   
     addressed as set forth below, or to such other address that either party
     designates by written notice to the other party;

     ENZO:
            Enzo Biochem, Inc.
            575 Fifth Avenue, 18th Floor
            New York, NY  10017
            Attn:  Dr. Barbara E. Thalenfeld
            Vice President, Corporate Development
            Fax No.:  (212) 856-0878

     DAKO:
            DAKO A/S
            Produktionsvej 42
            DK-2600 Glostrup
            Denmark
            Attn: John Place
            Business Development Manager
            Fax No.: 45 42 841822

17.  Governing Law

     This Agreement is made under and shall be governed by the laws of the State
     of New York.

18.  Waiver

     Waiver by ENZO or DAKO of any provision of this AGREEMENT shall not be
     deemed a waiver of future compliance therewith and such provision as well
     as all other provisions hereunder shall remain in full force and effect.

19.  Compliance with Laws

     Each party will comply with all United States laws, ordinances and
     regulations properly applicable to the manufacture, sale and distribution
     of the PRODUCTS described herein. Where applicable, the parties will comply
     with the laws of the country in which the product is being sold.

20.  Headings

     All Headings of the clauses of this AGREEMENT are inserted for convenience
     only and shall not affect any construction or interpretation of this
     AGREEMENT.

21.  Severability

     In the event that any clause of this AGREEMENT shall be found to be void or
     unenforceable, such finding shall not be construed to render any other
     clause of this AGREEMENT either void or unenforceable, and all other
     clauses shall remain in full force and effect unless the clause(s) which
    

                                        7


   
     is/are invalid or unenforceable shall substantially affect the rights or
     obligations granted to or undertaken by either party.

22.  Entirety

     This AGREEMENT together with the EXHIBITS attached hereto embodies the
     entire understanding between DAKO and ENZO, and there are no contracts or
     prior drafts of the AGREEMENT, understandings, conditions, warranties or
     representations, oral or written, express or implied, with reference to the
     subject matter hereof which are not merged herein. Except as otherwise
     specifically stated, no modification here to shall be of any force or
     effect unless (1) reduced to writing and signed by both parties hereto, and
     (2) expressly referred to as being modifications of this AGREEMENT.

     IN WITNESS, WHEREOF, the parties have caused this Agreement to be executed
     by their duly authorized representatives.

ENZO DIAGNOSTICS, INC.                 DAKO A/S



By:                                    By: 
    ------------------------------         -----------------------------------
           Elazar Rabbani

Title: President & CEO                 Title:         President
       ---------------------------            --------------------------------


Date:     Mar 21 1995                  Date:        5 May 1995
    ------------------------------         -----------------------------------


                                  * * * * * * *
    

                                        8


   
                                  EXHIBIT A
                              ENZO BIOCHEM, INC.
               ISSUED PATENTS AND PUBLISHED PATENT APPLICATIONS


US                4,711,955      US               4,889,798

US                5,328,824      EPO              151,492 A2

EPO               063,8799  B1   Canada           1,314,810

Denmark           164,407        US               4,898,325

Canada            1,219,824      US               5,228,609

EPO               329,198  A     EPO              159,719 B1

US                5,241,060      Canada           1,260,372

US                5,260,433      EPO              526,912 A3

EPO               097,373  B1    US               4,987,065

EPO               285,057  A2    EPO              133,473 B1

EPO               302,175  A2    US               4,755,458

EPO               286,898  A2    EPO              173,339 B1

EPO               285,058  A2    Canada           1,260,368

Canada            1,223,831      US               4,746,604

US                4,994,373      Canada           1,268,115

EPO               117,440  B1    EPO              202,688 A2

Canada            1,309,672      Canada           1,295,559

EPO               525,821  A2    EPO              212,546 B1

EPO               128,322  A1    EPO              213,495 A2

EPO               154,788  A2    EPO              224,860 B1

EPO               122,614  B1    Canada           1,315,222 B1

Candad            1,254,525      US               4,687,732

US                4,707,440      EPO              149,654 B1

US                4,843,122      Canada           1,237,369 B1

US                4,943,523      EPO              294,595 A3

US                4,849,208      US               5,082,830

US                4,952,685      EPO              330,221

US                5,002,885      US               5,024,933 A2

US                5,013,831      EPO              343,424  B1

US                5,175,269      EPO              435,150  A2

US                4,849,505      EPO              492,570  A1


     The PRODUCTS listed in Exhibit B are covered by one or more patents of
     Enzo, including the patents listed above.

     This list may be updated quarterly at Enzo's discretion.
    

                                        1


   
                                  EXHIBIT B
                               PRODUCT LISTING

IN SITU HYBRIDIZATION ASSAY SYSTEMS



Cat. No. Product                                                                                   Quantity           Price

BioPap(TM) Kits for Detection of HPV on Cervical Smear Specimens

                                                                                                           
32881    BioPap Human papillomavirus DNA Assay for Cervical Smears                               20 test kit        $ 345.00
32892    BioPap Human papillomavirus DNA Typing Assay for
           Cervical Specimens (Types 6/11, 16/18, 31/33/51                                       10 test kit          305.00
32883    BioPap Human Papillomavirus DNA Typing Assay
           Certival Specimen Transport Kit                                                       for 10 specimen       35.00

PathoGene(R) Kits for Detection of HPV on Formalin-fixed, Paraffin-embedded Tissue Sections

32879    PathoGene in situ Screening Assay for Human Papillomavirus                              20 test kit          425.00
32895    PathoGene in situ Typing Assay for Human Papillomavirus                                                      
           (Types 6/11, 16/18, 31/33/51)                                                         10 test kit          305.00
32877    PathoGene DNA Probe Assay for Identification of Human Papillomavirus                                         
           (Types 6/11, 16/18, 31/33/51                                                          20 test kit          525.00
32878    PathoGene HPV 18 DNA Probe Reagent                                                             1 ml          140.00
                                                                                                                      
PathoGene(R) Kits for Detection of Infectious Agents on Formalin-fixed, Paraffin-embedded Tissue Sections             
                                                                                                                      
                     Peroxidase-AEC Substrate Detection Kits                                                          
                                                                                                                      
32871    PathoGene DNA Probe Assay for Identification of Adenovirus                                                   
32872    PathoGene DNA Probe Assay for Identification of Cytomegalovirus                         20 test kit          235.00
32873    PathoGene DNA Probe Assay for Identification of Epstein-Barr Virus                      20 test kit          260.00
32874    PathoGene DNA Probe Assay for Identification of Hepatitis B Virus                       20 test kit          235.00
32875    PathoGene DNA Probe Assay for Identification of Herpes Simplex Virus                    20 test kit          235.00
32876    PathoGene DNA Probe Assay for Identification of Chlamydia trachomatis                   20 test kit          235.00
                                                                                                                      
                     Peroxidase-DAB Substrate Detection Kits                                                          
                                                                                                                      
32861    PathoGene DNA Probe Assay for identification of                                         20 test kit          235.00
32862    PathoGene DNA Probe Assay for identification of                                         20 test kit          260.00
32863    PathoGene DNA Probe Assay for identification of                                         20 test kit          235.00
32864    PathoGene DNA Probe Assay for identification of                                         20 test kit          235.00
32865    PathoGene DNA Probe Assay for identification of                                         20 test kit          235.00
32866    PathoGene DNA Probe Assay for identification of                                         20 test kit          235.00

    
                                       1

   

              Alkaline Phosphatase-BCIP/NBT Substrate Detection Kit

                                                                                                           
32851    PathoGene DNA Probe Assay for identification of Adenovirus                              20 test kit         $250.00
32852    PathoGene DNA Probe Assay for identification of Cytomegalovirus                         20 test kit          275.00
32853    PathoGene DNA Probe Assay for identification of Epstein-Barr Virus                      20 test kit          250.00
32854    PathoGene DNA Probe Assay for identification of Hepatitus B Virus                       20 test kit          250.00
32855    PathoGene DNA Probe Assay for identification of Herpes Simplex Virus                    20 test kit          250.00
32856    PathoGene DNA Probe Assay for identification of Chlamydia trachomatis                   20 test kit          250.00
                                                                                                                  
IN SITU HYBRIDIZATION ASSAY SYSTEMS                                                                               
                                                                                                                  
Cat. No. Product                                                                                 Quantity             Price
                                                                                                                  
32870    Peroxidase-ABC Detection Kit (ready-to-use)                                             20 test kit           95.00
32860    Peroxidase-ABC Detection Kit (ready-to-use)                                             20 test kit           95.00
32850    Alkaline Phosphate-BCIP/NBT (ready-to-use)                                              20 test kit          105.00
32700    Enhanced in situ Detection Kit, alkaline phosphatase                                    20 test kit          195.00
32600    Enhanced in situ Detection Kit, peroxidase                                              20 test kit          195.00
                                                                                                                  
IN SITU HYBRIDIZATION ASSAY SYSTEMS                                                                               
                                                                                                                  
Cat. No. Product                                                                                 Quantity             Price        
                                                                                                                  
46305    Dot Blot Hybridization and Detection Assay Kit                                            1 kit              750.00
46305C   Dot Blot Hybridization and Detection Assay Kit, Control DNA Pack                          1 kit              170.00
46307    Dot Blot Hybridization and Detection Assay Kit, CMV Control DNA Pack                      1 kit              135.00
46308    Dot Blot Hybridization and Detection Assay Kit, HBV Control DNA Pack                      1 kit              135.00
44300    Dot Blot Manifold                                                                         1 unit             425.00
46330    HIV-1 Microplate Hybridization Assay                                                     96 test kit         625.00
46331    SK 38K/SK 39 Oligonucleotide pair
           complementary to HIV-1 gag region                                                 5 nanomoles each         175.00
46340    MTB Microplate Hybridization Assay                                                       96 test kit         625.00
46341    MTB 10/MTB 11 Oligonucleotide pair complementary to MTB                             5 nanomoles each         175.00
46350    HBV Microplate Hybridization Assay                                                       96 test kit         625.00
46351    HBO1/HBO2 Oligonucleotide pair
           complementary to HBV core region                                                  5 nanomoles each         175.00
46352    HBV Serum Specimen Preparation Kit                                                  for 96 specimens          50.00
46353    HBV Enhanced Microplate Hybridization Assay                                         for 96 specimens         700.00
46354    HBV Serum Specimen Titration Standards                                    for 4 assay determinations          50.00
46360    HIV-2 Microplate Hybridization Assay                                                     96 test kit         625.00
46361    B306/VB310 Oligonucleotide pair complementary to HIV-2                              5 nanomoles each         175.00

    

                                        2

   


BIOPROBE(R) LABELED PROBES

                                                                                                           
Cat. No. Product                                                                                 Quantity             Price

40834    Adenovirus                                                                              80ul                $175.00
40835    Cytomegalovirus                                                                         80ul                 205.00
40836    Epstein-Barr Virus                                                                      80ul                 175.00
40837    Hepatitus B Virus                                                                       80ul                 175.00
40838    Herpes Simplex Virus                                                                    80ul                 175.00
40839    Chlamydia trachomatis                                                                   80ul                 175.00
40840    Lambda                                                                                  80ul                 175.00
40841    pBR322 (negative DNA control)                                                           80ul                  75.00
40842    Hepatitis A Virus                                                                       80ul                 175.00
40843    Mycoplasma pneymoniae                                                                   80ul                 175.00
40845    SV40                                                                                    80ul                 175.00
40846    Campylobacter jejuni                                                                    80ul                 175.00
40847    JC Virus                                                                                80ul                 175.00
40848    BK Virus                                                                                80ul                 175.00
40849    Blur 8 (human alu repeat) (positive DNA control)                                        80ul                  75.00
40714    c-Ha-ras (activated, human)                                                             80ul                 220.00
40717    c-Myc (human)                                                                           80ul                 220.00
40718    N-Myc (human)                                                                           80ul                 220.00

BIOPROBE(R) LABELING SYSTEMS FOR NUCLEIC ACIDS

Cat. No. Product                                                                                 Quantity             Price

42803    Nick Translation System (containing Bio II-dUTP)                                        for 10u DNA          230.00
42804    Nick Translation System (to be used with nucleotide of choice)                          for 10u DNA          105.00
42809    Terminal Labeling Kit                                                                   for 10u DNA          285.00
42810    Random Priming Kit (containing Bio 11-dUTP)                                             for 10u DNA          230.00
42813    BioBridge Labeling System                                                               for  8u DNA          295.00
42814    BioBridge Lebaling Molecule                                                             for  8u DNA          210.00
42807    RNA Labeling System - T3/T7                                              for 20 reactions (1u each)          330.00
42808    RNA Labeling System - SP6                                                for 20 reactions (1u each)          330.00

BIOPROBE(R) LABELING SYSTEMS FOR NUCLEIC ACIDS - BIOTINYLATED NUCLEOTIDES

Cat. No. Product                                                                                 Quantity             Price

42806    Bio-11dUTP (0.3 mM)                                                                  22.5 nanomoles          225.00
42806-50 Bio-11dUTP (1.0 mM)                                                                  50.0 nanomoles          285.00
42811    Bio-16dUTP (0.3 mM)                                                                  22.5 nanomoles          230.00
42811-50 Bio-16dUTP (1.0 mM)                                                                  50.0 nanomoles          285.00
42816    Bio-11dCTP (0.3 mM)                                                                  22.5 nanomoles          225.00
42816-50 Bio-11dCTP (1.0 mM)                                                                  50.0 nanomoles          285.00
42819    Bio-7-dATP (0.3 mM)                                                                  22.5 nanomoles          225.00

    

                                        3


   


                                                                                                           
42819-50 Bio-71dATP (1.0 mM)                                                                  50.0 nanomoles          285.00
42812    Bio-AP3-dCTP (0.3 mM)                                                                22.5 nanomoles         $230.00
42815    Bio-11-CTP (20 mM)                                                                   1u mole                 385.00
42801    Bio-11-CTP (20 mM)                                                                   1u mole                 385.00
42817    Allylamine UTP (20 mM)                                                               400 nanomoles           230.00

DETEK(R) SIGNAL GENERATING SYSTEMS

Cat. No. Product                                                                                 Quantity             Price

43818*   DETEK I-f                                                                            for 200 slides          180.00
43861*   IgG fraction rabbit anti-biotin                                                       0.4 ml                 210.00
43805*   DETEK-fav                                                                               5 ml                 110.00
43820*   DETEK-hrp Kit                                                             00 ml working solution or          150.00
                                                                                 40 membranes (100 cm2 each)
43822*   DETEK-alk Kit                                                            500 ml working solution or          225.00
                                                                                 40 membranes (100 cm2 each)
42823*   DETEK Enhancer Kit                                                                    for 20 slides          135.00

43825    Peroxidase Substrate Kit (AEC)                                              300 ml working solution           90.00
43826    Peroxidase Substrate Kit (DAB)                                              300 ml working solution           90.00
43827    Alkaline Phospharase Substrate Kit (NBT/BCIP)                               400 ml working solution          160.00

43406    ENZOITIN(R)Biotinylating Reagent                                                             100 mg          150.00

GLASS FIBER FILTERS

Cat. No. Product                                                                                 Quantity             Price

44524    Disc (24 min diameter)                                                               400/box                  60.00
44525    Disc (25 min diameter)                                                               400/box                  60.00
44101    Rectangle (10.25 cm x 25.4 cm)                                                       100/box                 120.00


* These PRODUCTS are designated for nucleic acid detection
    

                                        4

   
                                    EXHIBIT C
                                 PRODUCT LISTING



HYBRIDIZATION ACCESSORIES

Cat. No. Product                                                                                 Quantity             Price
                                                                                                           
31871      Adenovirus Control Slide                                                              1 slide             $ 15.00
31872      Cytomegalovirus Control Slide                                                         1 slide               15.00
31873      Epstein-Barr Virus Control Slide                                                      1 slide               15.00
31875      Herpes Simplex Virus Control Slide                                                    1 slide               15.00
31876      Chlamydia trachomatis Control Slide                                                   1 slide               15.00
31802/20   Pretreated slides, teflon coated, single well                                         20-pack               25.00
31802/100  Pretreated slides, teflon coated, single well                                         100-pack              85.00
31500      Heating Block for use with DNA Probe Assays 110V, 50/60HZ                             1 unit               300.00
31508      Heating Block for use with DNA Probe Assays 220V, 50 HZ                               1 unit               300.00
                                                                                                                     
32800      PathoGene Tissue Preparation Kit                                                 for 20 specimens          145.00
                                                                          
43825      Peroxidase Substrate Kit (AEC)                                            300 ml working solution           90.00
43826      Peroxidase Substrate Kit (DAB)                                            300 ml working solution           90.00
43827      Alkaline Phosphatase Suibstrate Kit (NBT/BCIP)                            400 ml working solution          160.00
43406      ENZOITIN Biotinylating Reagent                                                            100 mg           150.00

GLASS FIBER FILTERS

Cat. No. Product                                                                                 Quantity             Price

44524  Disc (24 mm diameter)                                                                     400/box             $ 60.00
44525  Disc (25 mm diameter)                                                                     400/box               60.00
44101  Retangle (10.25 x 25.4 cm)                                                                100/box              120.00

    

                                        1

   
                                    EXHIBIT D
                         DAKO COMPANIES AND DISTRIBUTORS
                                  Distribution



                                                                      
Argentina                               Brazil                              Costa Rica                     
Chemetron Latinoamericana S.A.          Embrabio-Empresa                    Laboratorics Zeiedon S.A.      
Junin 262                               Brasileira de Biotecnologia Ltda.   Apartado Postal 5236-1000      
PB 1 Capital Federal                    rua Apirages 1081                   San Jose                       
1028 Buenos Aires                       BR-05017 Sao Pauio/SP               Tel. 506 235 3959              
Tel/Fax 54 1 953 8918                   Tel. 55 11 262 5511                 Fax 506 235 1275               
Tlx. 9900                               Fax 55 11 263 0272                                                 
                                        Tlx. 1182970                        Cuba                           
Australia                                                                   Lablink SA                     
Bio Scientific Pty. Ltd.                Brunei                              Calle 134. No.138, e/19 y 21A  
P.O. Box 78                             SPD Scientific Pte Ltd.             Cubanacan                      
Gymea N.S.W. 2227                       108 Pasir Panjang Road              La Habana                      
(28 Monroe Ave. Kurawee)                #02-02 Amcol Warehouse              Tel/Fax +537 336 446           
Tel. 612 521 2177                       Singapore 0511                                                     
Toll-free line (outside Sidney Metro):  Singapore                           Cyprus                         
1 800 25 1437                           Tel. 65 4733720                     Meticell Co. Ltd.              
Fax 61 2 542 3037                       Fax 65 4732503                      55A Limissol Ave.              
Fax (technical inquiries):                                                  P.O. Box 8318                  
61 2 542 3100                           Canada                              Nicosta                        
                                        Dimension Laboratories Inc.         Tel. 2-494300                  
Austria                                 12 Falconer Drive, Unit 4           Fax 2-311362                   
Bender & Co. GmbH                       Mississauga, Ontario L5N 3L9                                       
Dr. Boenhringer-Gasse 5-11              Tel. 905 858 8510                   Czech Republic                 
P.O. Box 103                            Fax 905 858 8801                    BioVendor, s.r.o.              
A-1121 Viena                                                                Elasova 27                     
Tel. 1/80105-0                          Chile                               616 00 Bmo                     
Telex 132430                            PROLAB                              Tel. 5 77 21 23                
Fax 1/80105-488                         Vergara 24                          Fax 5 41 21 49 84              
                                        Oficina 908                                                        
Belgium                                 Castilla 3645                       Denmark                        
Prosan b.v.b.a                          Santiago                            DAKO A/S                       
Maums Sabbestraat 61                    Tel. 56 2 698 7215                  Producktionsvei 42             
B-9050 Gentrugge                        Fax 56 2 698 9617                   DK-2600 Giostrup               
Tel. 09 231 37 04                                                           Denmark                        
Fax 09 231 98 98                        China                               Tel. +45 44 92 00 44           
                                        China South Technology Ltd.         Tlx. 35 128                    
                                        Rm. 1303-4, 13/F. Remex Centre      Fax + 45 42 84 18 22           
                                        42 Wong Chuk hang Road                                             
                                        Hong Kong
                                        Tel. 852 552 8339                
                                        Fax 852 552 6883                 

    

                                        1


   

                                                                      

Ecuador                                 Greece                              Iran                                
Proveedores Para Laborationos O.        Ange M. Cailiphronas                Eskan Teb Tech Co.                  
Ltda.                                   4, Eyripidou Street                 6 Business Section, Eskan Buildings 
Edificio Pro-Lab                        GR-10559 Athens                     Minstamad Ave.                      
Luis Urdaneta Y Ave. del Ejercito       Tel. 01 3218 871                    P.O. Box 19395                      
Guayaquil                               Fax 01 3213 272                     1836 Teheran                        
Tel. 593 4 281943                                                           Tel. 21 808 7602                    
Tlx. 42985                              Holland                             Tlx 21 4158                         
Fax 593 4 285953                        ITK diagnostics bv                  Fax 64 3 338 0028                   
                                        Johan Enschadeweg 13                                                    
Egypt                                   NL-1422 DR Uithoom                  Israel                              
Lab Technology                          Tel. 02975 68893                    Tzamal Ltd.                         
4 Leith Ben Saad Street                 Fax 02975 63458                     21, Gonan Street                    
P.O. Box 5959                                                               Kiryat Matalon                      
Heliopolis West 113351                  Hong Kong                           P.O. Box 3064                       
Cairo                                   China South Technology Ltd.         Petach-Tikya 49130                  
Tel. 2-2361785                          Rm. 1303-4, 13/F. Remex Centre      Te. 03 9240 288                     
Fax 2-2428366                           42, Wong Chuk Hang Road             Tlx 38 1542                         
                                        Hong Kong                           Fax 03 9240 259                     
Finland                                 Tel. 852 552 8339                                                       
OY ALGOLAB                              Fax 852 552 6883                    Italy                               
Karapellonite 6                                                             DAKO S.p.A.                         
PL 13                                   Hungary                             Via P. Portaluggi n. 17             
02611 Espco                             Frank Diagnostica Ltd.              1-20138 Milano                      
Tel. 90 50991                           Dereglye Str. 2                     Italy                               
Fax 90 5099258                          1036 Budapest                       Tel. (02) 58 01 12 21               
                                        Tel. 36 1 188 3114                  Tech. Inq. (02) 50 60 311/211       
France                                  Fax 36 1 168 5721                   Fax (02) 50 47 78                   
DAKO S.A.                                                                                                       
2, rue Albert Einstein                  India                               Japan                               
B.P.149                                 J. Mitra & Co. (Pvt.) Ltd.          DAKO Japan Co., Ltd.                
F-78196 TRAPPES Cedex                   A-180, Okhia Industrial Area -      Hiraoka Building                    
France                                  Phase-1                             Nishinocuin-Higashiru, Shijo-dori,  
Tel. (1) 30 50 00 50                    Okhia                               Shimogyo-ku, Kyoto 600              
Telex 695 029                           New Delhi 110 020                   Tel. 81 75 211 3655                 
Fax (1) 30 50 00 11                     Tel. 011-6818 971/972/973           Fax 81 75 211 1755/1928             
                                        Telex 031-75114/031-62789                                               
Germany                                 Fax 011-6818970/0945                Tokyo Office:                       
DAKO Diagnostika GmbH*                                                      Chiyoda Panon Building              
Arn Staotrand 52                        Indonesia                           2-3-16 Kanda-sudacno, Chiyoda-ku,   
22047 Hamburg                           P.T. DW1 Marga Sakti                Tokyo 101                           
Postrach 70 04 07                       JL, Kedoya Azalea Vi,               Tel. 81 3 5256 6436                 
Hamburg 22004                           Block AXi No.7                      Fax 81 3 5256 6431                  
Tel. (040) 69 69 47-0                   Taman Kedaya Baru                                                       
Fax (040) 695 27 41                     Jakarta Barat 11520                                                     
                                        Tel. 62 21 5807-381,382,383,384     
                                        Fax 62 21 5807385                
                                        

    

                                       2

   

                                                                      

Hong Kong Office:                       Malta                               Oman                                 
2802-2804 Admiralty Centre,             Micnete Peresso Ltd.                Mustata & Jawad Trading Co. LLC      
Tower 1, 18 Harcourt Road               Catalunya Buildings                 S&I Dept.                            
Hong Kong                               Psaila Street                       P.O. Box 1918                        
Tel. 852 529 0356                       P.O. Box  30                        112 Ruwi                             
Tlx. 73553                              B'Kara                              Tel. 709955                          
Fax 852 861 3420/865 0790               Tel. 492191/446744                  Tlx 5611                             
                                        Tlx. 1498                           Fax 56 4005                          
Jordan                                  Fax 482593                                                               
Medical Business Center                                                     Panama                               
Sonamiyi Center                         Mexico                              Importadora DMD S.A.                 
P.O. Box 509                            Main Office:                        Apartoda 8556 Calle 31               
Amman                                   DOSTYM, S.A. De C.V.                Este No. 1-95                        
Tel 6 694865                            J.G.P.E. Montenegro No. 2325        Tel. 507 270537/251247               
                                        Col. Arcas Sur. C.P. 44150          Fax 507 271246                       
Korea                                   Guadalajara, Jaiisco                                                     
Fine Chemical Co. Ltd.                  Tel. 52 3 615 3385/3258/3130        Paraguay                             
Garden Tower Bldg. Rm. No. 1703                                             Dr. Ruben A. Sosky                   
98-78, Wun Ni-Dong, Jong Ro-Gu          Tlx. 683226                         Calidad                              
KPO Box 1260                            Fax 52 3 615 3513                   Mexico 923                           
Seoul                                                                       Asuncion                             
Tel. 82 2 744 7859                      Mexico City Office:                 Tel. 595 21 447 680/595 21 210       
Fax 82 2 744 5281                       DCSTYM, S.A. De C.V.                      -  064                         
                                        Reforma 24 No. 39 P.A.                                                   
Kuwait                                  Col. Avante                         Peru                                 
WAREA Medical Supplies Co.              Mexico, D.F.C.P. 04460              Representacciones Atlanta S.A.       
Nakib Building, 4th Floor               Tel/Fax 52 5 689 9843               Av. Republica De Panama No. 465      
Abu Bakir Street, Al Jiblah                                                 Callao 1-Peru                        
P.O. Box 26267                          New Zealand                         Tel. 51 14 65 2421                   
KT-13123 Safat                          Med-Bio Enterprises Ltd.            Fax 51 14 65 4833                    
Tel. 2 426939/2 469949/2 423573         P.O. Box 33-135                                                          
Tlx. 44470                              Barrington                          Philippines                          
Fax 2 429482                            Christchurch                        Levin's International Corporation    
                                        Tel. 643 338 1020/64 9 655 912      3rd Floor R. Syjuco Building         
Malaysia                                Fax 64 3 338 0028                   993 E. Delos Santos Ave.             
General Scientific Co. Sdn. Blvd.                                           Cor. Bansalangin St.                 
No. 7 Jalan 222, Section 51A            Norway                              Diliman, Quezon City                 
Petailing Jaya                          Bio-Test AVS                        Tel. 63 2 97 44 75/76                
Setangor Danul Easan                    Idretsveien 2                       Tlx 65507                            
Tel. (03) 7575 433                      P.O. Box 66                         Fax 63 2 98 4841                     
Tlx. 374431                             N-1580 Rygge                                                             
Fax (03) 7571 768                       Tel. 69 26 17 77                    Poland                               
                                        Fax 69 26 17 60                     ALAB sp. z o.o.                      
                                                                            uL Pasteura 3                        
                                                                            FL-02-093 Warsaw                     
                                                                            Tel. 02-659 8571                     
                                                                            Tel/Fax 02-658 2059                  

    

                                     3

   

                                                                      

Portugal                                Sweden                              United Arab Emirates               
Labormeter LDA                          DAKOPATTS AB                        Al-Zanrawi Medical                 
Rua Duque de Palmera, No. 30,           Box 13                              P. O. Box No. 5973                 
1(degree)-G                             S-125 21 Alvsjo                     Dubai                              
P-1200 Lisbon                           Tel. 08-99 60 00                    Tel. 4-622728                      
Tel. 01 3537284                         Fax 08-99 60 65                     Fax 4-625506                       
Fax 01 3525066                                                                                                 
                                        Switzerland                         United Kingdom                     
Republic of South Africa                DAKO Diagnostics AG                 DAKO Ltd                           
Southern Cross Biotechnology (PTY)      Untermuli 7                         16 Manor Courtyard                 
Ltd.                                    6302 Zug                            Hughenden Avenue                   
P. O. Box 23681                         Tel. 042 32 11 66                   High Wycombe                       
Claremont 7735                          Fax 042 32 11 77                    Bucks, HP13 5RE                    
Cape Town                                                                   Tel. 01494 452016                  
Tel. 021-615166/7                       Syria                               Fax 01494 441846                   
Fax 021-617734                          Medical Business Center                                                
                                        P. O. Box 30589                     DAKO Diagnostics Ltd.              
Saudi Arabia                            Damascus                            Denmark House                      
Medical Business Center, M.B.C.         Tel. (11) 22 46139/424676           Cambridgeshire Business Park       
P. O. Box 189                           Fax (11) 22 46139                   Angel Drove                        
Jeddah 21411                                                                Ey                                 
Tel. 2 6429200                          Taiwan                              Cambridge CB7 4ET                  
Fax 2 6435488                           Hong Jing Co. Ltd                   Tel. 01353 669911                  
                                        6F-3 No. 60, Ai kuo E. Rd.          Fax 01353 668989                   
Singapore                               Taipei                                                                 
SPD Scientific Pte Ltd.                 Tel. 886 2 3930185                  United States of America           
108 Pasir Panjang Road                  Fax 886 2 3923864                   DAKO Corporation*                  
#02-02 Amcol Warehouse                                                      6392 Via Reel                      
Singapore 0511                          Thailand                            Carpinteria                        
Tel. 65 4733720                         Science Tech Co. Ltd                CA 93013                           
Fax 65 4732503                          321/43 Nanglinchee Road             Tel. 805 566 6655                  
                                        Chongnondsee, Yannawa               Fax 805 566 6688                   
Slovenia A-Z Consulting d.o.o.          Bangkok 10120                                                          
Miklosiceva 38                          Tel. 66 2 285 4101-3/4871-2         Uruguay                            
61 000 Liubljana                        Tlx 82731                           Poliuruguay S.R.L                  
Tel. 386 61 133 6322                    Fax 66 2 285 4856                   Avda Uruguay 1771                  
/301 884/325 860                                                            Montevideo 11200                   
Fax 386-61 301 985                      Turkey                              Tel. 59 82 402365/484126           
                                        Hayat Inc.                          Fax 59 82 409017                   
Spain                                   Miller Cad. 75/8                                                       
ATOM S.A.                               34280 Findikzace                    Zimbabwe                           
Passeig D'Amunt, 29                     Istanbul                            National Diagnostics Ltd.          
E-08024 Barcelona                       Tel. 212 632 1341 (4 lines)         P. O. Box 3535                     
Tel. 93 284 79 04                       Fax 212 587 9402                    Harare                             
Fax 93 210 82 55                                                            Tel. 4 791615                      
                                                                            Fax 4 728055                       


                                              * Special DAKO catalogue available
    

                                        3