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Original Repository. Alan Mason Chesney Medical Archives. Daniel Nathans Collection. 12640. Periodical. Peden, Keith W. C., and Daniel Nathans. "Local Mutagenesis within Deletion Loops of DNA Heteroduplexes." Proceedings of the National Academy of Sciences of the United States of America 79, 23 (December 1982): 7214-7217. Article. 4 Images.. Proceedings of the National Academy of Sciences of the United States of America