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Baldwin GS, Grego B, Hearn MT, Knesel JA, Morgan FJ, Simpson RJ.Baldwin GS, et al. Among authors: grego b.Proc Natl Acad Sci U S A. 1983 Sep;80(17):5276-80. doi: 10.1073/pnas.80.17.5276.Proc Natl Acad Sci U S A. 1983.PMID: 6604272Free PMC article.