American physician and researcher who received the 1943 Nobel Prize in Medicine for his discoveries related to the chemical nature of vitamin K. TLS signed “E. A. Doisy,” one page, 8 x 11, St. Louis School of Medicine letterhead, March 31, 1959. A response to an inquiry. In part: “Theelin was the first pure crystalline steroid hormone to be isolated. It was obtained in this form from the urine of pregnant women in 1929…. Although theelin was not isolated from sow ovaries very definite evidence of its presence was obtained.” In fine condition. R&R COA.
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