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Schmer MR, Vogel KP, Mitchell RB, Perrin RK.Schmer MR, et al. Among authors: vogel kp.Proc Natl Acad Sci U S A. 2008 Jan 15;105(2):464-9. doi: 10.1073/pnas.0704767105. Epub 2008 Jan 7.Proc Natl Acad Sci U S A. 2008.PMID: 18180449Free PMC article.