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Axel Hugo Teodor Theorell (born July 6, 1903, Linköping, Sweden—died Aug. 15, 1982, Stockholm) was a Swedish biochemist whose study of enzymes that facilitate oxidation reactions in living cells contributed to the understanding of enzyme action and led to the discovery of the ways in which nutrients are used by organisms in the presence of oxygen to produce usable energy. Theorell won the Nobel Prize for Physiology or Medicine in 1955. While serving as an...