February 16, 1966

Dr. Manvel V. Ortesa

Centro de Investigacion y de Estudios

_ Avenzedos del Instituto Politecnico
Nacional

Apartedo Postal 14-740

¥

Hexica 14, D. P.
Dear Dre. Ortega:

i'm glad the strains you requested arrived in gocd shape and

hope they are useful. You may of course use them in your own Investi-
gations freely and also distribute then freely. As for your
inquiry about strain S¥1452, it is the same in both reports as far
as I can tell, I would euess that Dr. Mokela'ts data are much
more preliminary and casual. The best way would be for you

to inquire directly of her in Helsinki and alse Sanderson and
Denerec to know for sure. You may be interested to know that

Dr. B. A. D. Stocker who use to he at the Lester Inst. in

London is now continuing his studies of Salm ovella genetics at
the Hicroblelogy Dept. here in the Stanford Medical School.

Sincerely

E. H. Lederberg, Ph.D.
Reaearch Geneticist