American geneticist (1909-1975) who shared the 1958 Nobel Prize in Physiology or Medicine for showing that genes control individual steps in metabolism. Vintage glossy 5 x 7 head-and-shoulders photo of Tatum in a suit and tie, signed in fountain pen, "E. L. Tatum." Reverse bears a Rockefeller Institute credit stamp. In fine condition, with some small surface impressions. Accompanied by an unsigned press photo of Tatum with a microscope.
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