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Treynor TP, Vizcarra CL, Nedelcu D, Mayo SL.Treynor TP, et al. Among authors: vizcarra cl.Proc Natl Acad Sci U S A. 2007 Jan 2;104(1):48-53. doi: 10.1073/pnas.0609647103. Epub 2006 Dec 19.Proc Natl Acad Sci U S A. 2007.PMID: 17179210Free PMC article.