UNIVERSITY OF
Telephone 42080

fror. Lederbers,

Dept. o£ Genetics,
Vollege of Azsriculture,
University or ‘liseonsin,
nadison, 6,

Jisconsin,

U.S.A.

a

Dear Lederberg,

It was very pleasant

EDINBURGH Biochemistry Unit,
Zoology Department,
West Mains Road,

Edinburgh 9.

. tn
April 8°", 1957.

meeting you while you were aashing

through Edinburgh, and I was sorry not to have the chance to talk

in a more leisurely way about our mutual interests which I think may

be broader than you suspected.

You may remember that I tole you we were interested in setting
coli mutants for vermeability work, and I wonder it you would be so
The ones We want are the mutant used

Kind as to send them to us.

by Doudorotf, the number of which he does not quote, that ternents

naltose but not glucose;

also_lit 40 having galactosidase and the

so-called permease, and IiL 5 having cryptic galactosidase.
£ hope you had a pleasant trip back hone.

with kind regards, Yrs.

some

df fevaDs thy

*
Py