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Konrad Emil Bloch was a German-American biochemist. He was awarded the Nobel Prize in Physiology or Medicine in 1964, along with Feodor Lynen, for his discovery of the role of cholesterol in the biosynthesis of bile acids and steroid hormones. Bloch emigrated to the United States in 1934 to escape Nazi persecution. He worked at the Rockefeller Institute for Medical Research from 1936 to 1976.