January 28, 1958

Dr. Milton Weiner
University of Pittsburgh
Sohool of Medicine
Departsent of Microblology
Pittsburgh 13, Pennsylvania
Dear Milton:
To yours of the 15th:
We'll help where we can.
(1) Does not exist as far as I know.

(2) Better get this from Hershey — we've done nothing
along that line.

(3) Our putative "Hfr Lac," is also infertile.

We are sending you W-3120-Hfr x” Lac,,,. This carries
the identical Lac)™ marker as th type strein (¥87).

All best wishes,

Joahua Lederberg
Professor of Medical Genetics

JL/ew

WI enon