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Original Repository. Alan Mason Chesney Medical Archives. Daniel Nathans Collection. 12640. Periodical. Danna, Kathleen J., and Daniel Nathans. "Bidirectional Replication of Simian Virus 40 DNA." Proceedings of the National Academy of Sciences of the United States of America 69, 11 (November 1972): 3097-3100. Article. 4 Images.. Proceedings of the National Academy of Sciences of the United States of America