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Layet C, Germain RN.Layet C, et al. Among authors: germain rn.Proc Natl Acad Sci U S A. 1991 Mar 15;88(6):2346-50. doi: 10.1073/pnas.88.6.2346.Proc Natl Acad Sci U S A. 1991.PMID: 1900941Free PMC article.