MAY 4 1973

Yale Univer sity New Haven, Connecticut 06510

DEPARTMENT OF MICROBIOLOGY
310 Cedar Street

Telephone: (203) 436-1770
May 1, 1973

Dear Josh -

We have recently had several requests for some of the
early Yale &nd Wisconsin K-12 mutant strains - pro-
bably as a result of the appearance of the pedigree
paper ~ from people who want to track various anomalies
back to their sources.

Unfortunately, the strains labeled Y10 and Y53 which we
obtained from your lab sometime ago did not check out.

In addition, we now have a demand for the following: 679,
679-680, W904 and W945. For future reference, it might
be good to have: . W480 and W894 as well, as they
occur after a point where the K-12 family tree branches.

I'd be grateful if you would send us the eight strains
mentioned above. We'll check them carefully before

ina t . .
sending them out Sincerely,

“Sarbsore

P.S. I've not been able to get hold of a culture of
CS101 anywhere. Do you have this strain in your
collection? I believe that Skaar made it. Garen
doesn't have it, and Skaar doesn't answer his mail.