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Paul Berg died on February 15, 2023, at the age of 91. He was an American molecular biologist and biochemist who won the Nobel Prize in Physiology or Medicine in 1980 for his work on recombinant DNA. Berg was born in Brooklyn, New York, in 1926. He studied chemistry at the University of Pennsylvania and earned his Ph.D. in biochemistry from the California Institute of Technology in 1955.