SCHOOL OF MEDICINE
SAINT LOUIS (10), MO.

 

{ENT OF BACTERIOLOGY AND IMMUNOLOGY
“ZUCLID AVENUE AND KINGSHIGHWAY \ September 21, 1949.

 

Dr. Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Doctor Lederberg:
I would like to obtain a biotinless mutant of Ee colie
Dr. Hershey suggested that I write to youe Could you possibly send
me such a oulture with a brief note on how to cultivate ite ‘

Thenking you very much, I am

Sincerely yours,

' LL 7
SIA /MoK arnt v Y=

Samuel Je Ajl.