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Periodical. Chamberlin, Michael, and Paul Berg. "Deoxyribonucleic Acid-Directed Synthesis of Ribonucleic Acid by an Enzyme from Escherichia coli." Proceedings of the National Academy of Sciences of the United States of America 48, (1962): 81-94. Article. 14 Images.. Proceedings of the National Academy of Sciences of the United States of America