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Bley CJ, Qi X, Rand DP, Borges CR, Nelson RW, Chen JJ.Bley CJ, et al. Among authors: borges cr.Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20333-8. doi: 10.1073/pnas.1100270108. Epub 2011 Nov 28.Proc Natl Acad Sci U S A. 2011.PMID: 22123986Free PMC article.