reprints

Janumgy 29, 1949.
Dear Bernie, ‘\

Dy?

I'm enclosing a bateh of reprint requests that have come in, on
the chance that some of then won't be covered autonatLoelly by having
sent duplicates to you. I hope that I can get acco uple of hundred of
them in tine for my next generci mailing in a fe weeks, when the

Heredity reprints are due.

The USPHS has teld me that 1 can spend their money on reprints,
(with a little red tupe to be gure) so let ae knuw If you're running
into any trouble, and I'll foot the bill.

Zinder has been working up a Salmonella “aromaticless" mtant
that iaay be of some interest. It responds to phenylalanine ani tyrosine,
but also to a variety of phencls; most interestingly to cyclohexanol
plus serine. It locks very likely to me thet the benzene ring is syne
thesized via cyclohexyl derivatives, especial:y as someone has d-monatrated .
that coli had a dehydrogenase for c-hexaneca rbozyliczacid.

Tf you want us to muke uw trial on some of your ore stable mtants
for sexuality, we will be gled to; at any rate, I hope that you and werner
Can get around to it. Right now, I'm beginning to wish that we nad a
darger series of K-12 mitants. Almost ell of them funnsl back through
the two original blotinless and threonineless, and there ig reason to
think that there may be some chromesonal peculisrities in one of these,
Did you say that you were willing to use K-12 in mutant production?

Let me know whther to send you a slant, or perhaps Ryan cai sunply it.

Best regards, and see you in Chicago,
Sincar aly,

Joshua Lederber=