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Tamir DI, Mitchell JP.Tamir DI, et al.Proc Natl Acad Sci U S A. 2010 Jun 15;107(24):10827-32. doi: 10.1073/pnas.1003242107. Epub 2010 Jun 1.Proc Natl Acad Sci U S A. 2010.PMID: 20534459Free PMC article.