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Periodical. Hayashi, M., M. N. Hayashi, and Sol Spiegelman. "DNA Circularity and the Mechanism of Strand Selection in the Generation of Genetic Messages." Proceedings of the National Academy of Sciences of the United States of America 51, 2 (February 1964): 351-359. Article. 9 Images.. Proceedings of the National Academy of Sciences of the United States of America