April 27, 1953

Dr. #. R. Hinshaw
VM Division, GmlC Biol. Lab.
Camp Detrick, Frederick, MA,

Dear Dr. Hinshew:

Lately, I havo been studying some strsina of the S. pullcrumgsllinarum
group by means cf genetic tranaduction. Are any cf the mol tose-poaitive
variants of Sbepullorum still avedlable? Tf so, I should be ersteful to
you for two cr three énibebos chich tarnested miatose revidiy upon first
isolation, and one or two which will engendar maltose—pogitive variants
in laboratory culture. 4 reprint cf your 1943 (dg. Inf Dts.) pacer an
the subject “ould be anpraciated alec. 2

‘

i

Yours sincarely,

Joshua. Lederberg
Assoclate Professor of Ganeatics