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Gilbert CC, Rossie JB.Gilbert CC, et al.Proc Natl Acad Sci U S A. 2007 Jul 17;104(29):11910-4. doi: 10.1073/pnas.0702174104. Epub 2007 Jul 9.Proc Natl Acad Sci U S A. 2007.PMID: 17620604Free PMC article.