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Letter from Max Zelle to Joshua Lederberg

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NEW YORK !Sl”A’I’E COLLEGE OF AGRICULTURE -., CORNELL UNIVERSITY ITHACA. NEW YORK LABORATORY OF BACTERIOLOGY July 5, 1949 Dr. Joshua Lederberf: Genetics !%partment University of YJisconsin !&&son 6, W isconsin ilear Josh: Refrigerators are wonderful things! 'Xhile digging out some ph@;e stocks to take to Oak Ridge I stumbled across some old mannitol ad zylose plates of H168. Frcm these I will be able to isolate a xylose seSrezating Hlf33. I have smt 16 isolates as indicated on the enclosed diagram. Since I am leaving for Oak Ridge in a half-hour I will not have time to prove the cultures but I think scme of them at least should be OK. maddress at Oak Ridge will be: c/o Dr. Alexander Hollamder Biology Department Oak Ridge National LaboratoSg Oak Ridge, Tennessee I hope the qylose segregating cultures will help solve the puzzle a bit and renove any doubts from your mind as to the behavior of theoriqinal HI.68 culture. Very truly yours, M .’ R. Zelle

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