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Phan KL, Sripada CS, Angstadt M, McCabe K.Phan KL, et al.Proc Natl Acad Sci U S A. 2010 Jul 20;107(29):13099-104. doi: 10.1073/pnas.1008137107. Epub 2010 Jul 6.Proc Natl Acad Sci U S A. 2010.PMID: 20615982Free PMC article.