THE INSTITUTE FOR CANCER RESEARCH 
7701 BUSEOLME AVENUE 
FOX CHASE • PHILADELPHIA, PENNSYLVANIA 10111 
(215) 342-1000' CABLE AD DR E S s: CANS BAR C H 
Dec. 14, 1979 
Dr. Donald S. Freder ickson 
Director 
National Institutes of Health 
Betheada, Md 20014 
Dear Dr. Frederickson : 
I fully support your position that all recombinant DNA research performed 
with coli strain K12 should be classified Pl/EKl. In my considered opinion 
the potential risks of such research have been carefully evaluated by well- 
informed specialists and that his classification is a proper one. 
Yours truly, 
Dr . Martin Nemer 
[ 490 ] 
THE FOX CHASE CANCER CENTER 
