EXTENSION OF EMPLOYMENT AGREEMENT DATE: June 30, 2004 Parties: Techne Corporation 614 McKinley Place N.E. Minneapolis, MN 55413 Monica Tsang, Ph.D. AGREEMENTS: The parties hereby agree that the termination date of the Employment Agreement between them...

                        EXTENSION OF EMPLOYMENT AGREEMENT


DATE:     June 30, 2004

Parties:   Techne Corporation
           000 XxXxxxxx Xxxxx X.X.
           Xxxxxxxxxxx, XX  00000


           Xxxxxx Xxxxx, Ph.D.


AGREEMENTS:

     The parties hereby agree that the termination date of the
Employment Agreement between them for the period July 1, 1995 through June 30,
1998 and previously extended to June 30, 2004 is extended to June 30, 2007.
All other provisions of such Employment Agreement shall remain in full force
and effect.


                                     Techne Corporation



                                     By /s/  Xxxxxx X. Xxxxx
                                     ------------------------
                                     Xxxxxx X. Xxxxx, President




/s/  Xxxxxx Xxxxx
------------------
Xxxxxx Xxxxx, Ph.D.