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LaMunyon CW, Ward S.LaMunyon CW, et al.Proc Natl Acad Sci U S A. 1997 Jan 7;94(1):185-9. doi: 10.1073/pnas.94.1.185.Proc Natl Acad Sci U S A. 1997.PMID: 8990183Free PMC article.