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Aquadro CF, Weaver AL, Schaeffer SW, Anderson WW.Aquadro CF, et al. Among authors: schaeffer sw.Proc Natl Acad Sci U S A. 1991 Jan 1;88(1):305-9. doi: 10.1073/pnas.88.1.305.Proc Natl Acad Sci U S A. 1991.PMID: 1702542Free PMC article.