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Mufson EJ, Kordower JH.Mufson EJ, et al.Proc Natl Acad Sci U S A. 1992 Jan 15;89(2):569-73. doi: 10.1073/pnas.89.2.569.Proc Natl Acad Sci U S A. 1992.PMID: 1309947Free PMC article.