THE UNIVERSITY OF ROCHESTER

SCHOOL OF MEDICINE AND DENTISTRY
AND

STRONG MEMORIAL HOSPITAL

ROCHESTER, NEW YORK 14642

DEPARTMENT OF MICROBIOLOGY February 28, 1977

Dr. Joshua Lederberg

Professor of Genetics

Stanford University Medical Center
Department of Genetics

Stanford, California 94305

Dear Josh:

Enclosed is a copy of an article that we have developed for
submission to ''Science''’. | have no idea whether it will be
accepted. However, | thought it would be appropriate to send you
a copy at this time. The literature summarized, enables one to
see the extent of genetic exchange that naturally occurs among
prokaryotes. Also, it addresses the concept of species barriers.
| would be greatly interested in learning any remarks or criticism
that you would like to transmit following examination of the
manuscript.

Sincerely,

Prank) ©. i +/
Frank E. Young, W.D., Ph.D.
Professor and Chairman

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