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Original Repository. Alan Mason Chesney Medical Archives. Daniel Nathans Collection. 12640. Periodical. Shortle, David, and Daniel Nathans. "Local Mutagenesis: A Method for Generating Viral Mutants with Base Substitutions in Preselected Regions of the Viral Genome." Proceedings of the National Academy of Sciences of the United States of America 75, 5 (May 1978): 2170-2174. Article. 5 Images.. Proceedings of the National Academy of Sciences of the United States of America