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Rich SM, Xu G.Rich SM, et al. Among authors: xu g.Proc Natl Acad Sci U S A. 2011 Aug 9;108(32):12973-4. doi: 10.1073/pnas.1110141108. Epub 2011 Jul 29.Proc Natl Acad Sci U S A. 2011.PMID: 21804030Free PMC article.No abstract available.