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Petrova OE, Sauer K.Petrova OE, et al.Proc Natl Acad Sci U S A. 2012 Oct 9;109(41):16690-5. doi: 10.1073/pnas.1207832109. Epub 2012 Sep 24.Proc Natl Acad Sci U S A. 2012.PMID: 23012421Free PMC article.