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McClelland AC, Sheffler-Collins SI, Kayser MS, Dalva MB.McClelland AC, et al. Among authors: sheffler collins si.Proc Natl Acad Sci U S A. 2009 Dec 1;106(48):20487-92. doi: 10.1073/pnas.0811862106. Epub 2009 Nov 13.Proc Natl Acad Sci U S A. 2009.PMID: 19915143Free PMC article.