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Konrad Bloch was a German-American biochemist who received the Nobel Prize in Physiology or Medicine in 1964, along with Feodor Lynen, for his discoveries concerning the biological synthesis of cholesterol and other sterols. Bloch's work in the 1940s and 1950s on the metabolism of cholesterol, which is essential for the synthesis of bile acids, hormones, and vitamin D, led to the development of drugs to treat high cholesterol levels.