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Periodical. Preiss, Jack, Paul Berg, E. J. Ofengand, Fred H. Bergmann, and Marianne Dieckmann. "The Chemical Nature of the RNA-Amino Acid Compound Formed by Amino Acid-Activating Enzymes." Proceedings of the National Academy of Sciences of the United States of America 45, 3 (1959): 319-328. Article. 10 Images.. Proceedings of the National Academy of Sciences of the United States of America