UNIVERSITY of PENNSYLVANIA

PHILADELPHIA 4

The School of Medicine

DEPARTMENT OF BIOCHEMISTRY May 23, 1961

Dr. Joshua Lederberg
Department of Genetics
Stanford University
School of Medicine
Palo Alto, California

Dear Josh:

Thanks for the picture of Esther and
yourself. It will be part of an august
company.

Best regards.

Sincerely yours,

Seymour( 9. Cohen

SSC:db