January 5, 1955

Dear Syd:
The yeast mutants you requested are enclosed herewith. In case the labels
drop off, WY~38 is the shorter ampoule, with a somewhat denser suspension.

The diagnoses are: (both cultures from Raut):
WE-38 = her 108.3N= a thiamin-, melibiose-, galactose-
WY-39 = her 153.4 = alpha adenine” (pink; needs re&aolation) gal- mal-

ow

 

Since your last letter, I noticed her abstract which appeared in the Records
of the Genetics Society of America, 1954. This will be reprinted in the Nov. 1954
issue of Genetics which has yet to appear. As I thought you might be urgently
interested, I have copied it in toto to forward tof you.

 

Evidently, UV acts rajttherlike acriflavine, presumbly quite independently
of its mutagenic action. Bither petite mutants will have to be backcrossed to
wild type in hopes af restoring their cytoplasm, and recovering the mutant genes
in segregants; alternatively, other mutagens will have to be fotnd, in hopes that
some will have less of a cytoplasmic effect.

Yours,

Mth Mi