CARNEGIE INSTITUTION OF WASHINGTON
DEPARTMENT OF GENETICS

GOLD SPRING HARBOR, LONG ISLAND, N.Y.

January 2h, 1953

Dr, Joshua Lederberg
Department of Genetics
University of Wisconsin
Madison 6, Wisc. .

Dear Lederberg:

We are looking very closely at
the role of DNA in growth of T2. We haven't
any startling results but are collecting good
solid data and have developed some dandy methods
for confirming other peoplets results. Sooner
or later we will have to look at one of the
DNA-less phages. Can you recommend to me a
UV-resistant phage and sensitive host that are
as much like T2 and B as possible in other
respects?

I haven't seen much of Zinder--
I was away when he was here recently. I look
forward to seeing you both next summer at the
latest.

Sincerely,

Cea,

A. D. Hershey