UNIVERSITY oF MINNESOTA

Tue Mepicau ScHoo.t
MINNEAPOLIS 14

DEPARTMENT OF PHYSIOLOGICAL CHEMISTRY Ss ep t emb: er 2 1 ; 1 9 5 6

pals 7H

Professor Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison, Wisconsin

Dear Professor Lederberg:

We are interested in doing some experimental studies with
E. coli using the K12S strain such as has been used by Drs.
Cohen and Rickenberg. Dr. Monod tells me that this strain is
the same as the \sensitive K12 strain which I understand you
have in stock as cultures. If it would be convenient for you
to send us a culture of same, would you kindly do so.

I have not met you personally and hesitate to make this
request except that the necessary strain does not appear to
be available from the American Type Culture Collection. We
do have a good mutual friend in Dr. Lardy at the University
of Wisconsin, and we are both indebted to you for suggestions
relative to the forthcoming: edition of The Enzymes.

Please accept my thanks in advance for your kind attention
to this matter.

Very truly yours,

Ebi

P. D. Boyer
Professor
PDB: ejb

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