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Letter from Aaron Novick to Joshua Lederberg

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CHICAGO 37. ILLINOIS anetltute of PabtobtoIoep anb 331opbaeice 6200 Drexel Avenue March 6, 1950 Dr. Joshua Lederberg Department of Genetics College of Agriculture The University of i ' i isconsin Madison 6, ?isconsin Dear Josh, I enclose a circuit diagram for the counting unit we use. I will be pleased tc answer any quest ions if the circuit is not clear. It can, of course, be done more simply. Regarding strains 1288 and 1289, I find the 1283 behaves like K-12 while 1289 be- '. of 1289 seems However, the,!)%liation sensitivity much or 1288. greater than that of K-12, W -1, This I do not understand. In the last experiment samples of 1288, 1289, and.K-12 were prepared concurrently and identically. I will repeat the entire experiment. iYe enjoyed seeing you very much and it makesus happy that you are so at ease in our house. Sincerely, Aaron Novick AN/sds Enclosure

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