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Periodical. Haruna, I., K. Nozu, Y. Ohtaka, and Sol Spiegelman. "An RNA 'Replicase' Induced by and Selective for a Viral RNA: Isolation and Properties." Proceedings of the National Academy of Sciences of the United States of America 50, 5 (November 1963): 905-911. Article. 4 Images.. Proceedings of the National Academy of Sciences of the United States of America