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Periodical. Yankofsky, S. A., and Sol Spiegelman. "The Identification of the Ribosomal RNA Cistron by Sequence Complementarity, I. Specificity of Complex Formation." Proceedings of the National Academy of Sciences of the United States of America 48, (1962): 1069-1078. Article. 10 Images.. Proceedings of the National Academy of Sciences of the United States of America