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Original Repository. Alan Mason Chesney Medical Archives. Daniel Nathans Collection. 12640. Periodical. Christy, Barbara A., Laura K. Sanders, Lester F. Lau, Neal G. Copeland, Nancy A. Jenkins, and Daniel Nathans. "An Id-Related Helix-Loop-Helix Protein Encoded By a Growth Factor-Inducible Gene." Proceedings of the National Academy of Sciences of the United States of America 88, 5 (March 1991): 1815-1819. Article. 5 Images.. Proceedings of the National Academy of Sciences of the United States of America