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Chajek-Shaul T, Hayek T, Walsh A, Breslow JL.Chajek-Shaul T, et al. Among authors: hayek t.Proc Natl Acad Sci U S A. 1991 Aug 1;88(15):6731-5. doi: 10.1073/pnas.88.15.6731.Proc Natl Acad Sci U S A. 1991.PMID: 1907375Free PMC article.