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Arthur Kornberg (March 3, 1918 – October 26, 2007) was an American biochemist who won the Nobel Prize in Physiology or Medicine 1959 for his discovery of "mechanisms in the biological synthesis of ribonucleic acid and deoxyribonucleic acid" (RNA and DNA) together with Spanish biochemist and physician Severo Ochoa of New York University.Photograph credit: NIH History Office; restored by Bammesk