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Charroux B, Royet J.Charroux B, et al.Proc Natl Acad Sci U S A. 2009 Jun 16;106(24):9797-802. doi: 10.1073/pnas.0903971106. Epub 2009 May 29.Proc Natl Acad Sci U S A. 2009.PMID: 19482944Free PMC article.