YALE UNIVERSITY SCHOOL OF MEDICINE
333 CEDAR STREET - NEW HAVEN : CONNECTICUT
DEPARTMENT OF PHYSIOLOGICAL CHEMISTRY

April 24, 1952

Dr, Joshua Lederberg
Depertment of Genetics
Collere of Arriculture
University of “isconsin

Dear Josh,

T'm plannine to start some experiments on the
bacterial metabolism of serine peptides and am
trvine to collect some serineless mutants of &. coli.
If you have envy in yourg coliection ~- and esnecielly
derivatives of M12 - I'd c¥eatly appreciate it if
you'd send me cultures, AAs you can see from the
letterhead, I'm now ovey at the Medical Gchool and,
for technical reasons,/the undertaine of a mutant
hunt is somewhat diffAcult at the present time,

 
   
   
  
  
 

Incidentally,Wwhat do you think of Adelbergts
modification of your venicillin-detection method?
From the abstract in the Federation Proceedings
it looks like a worthwhile addition to the technique,

Vith best regards to ssther,

Sincercly,
“Ves

Sofia Simmonds

(2[47: sea 1 Bo f Oo7"8