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Nussinov R, Wolfson HJ.Nussinov R, et al.Proc Natl Acad Sci U S A. 1991 Dec 1;88(23):10495-9. doi: 10.1073/pnas.88.23.10495.Proc Natl Acad Sci U S A. 1991.PMID: 1961713Free PMC article.