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Zandy NL, Playford M, Pendergast AM.Zandy NL, et al.Proc Natl Acad Sci U S A. 2007 Nov 6;104(45):17686-91. doi: 10.1073/pnas.0703077104. Epub 2007 Oct 26.Proc Natl Acad Sci U S A. 2007.PMID: 17965237Free PMC article.