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Ames P, Parkinson JS.Ames P, et al.Proc Natl Acad Sci U S A. 2006 Jun 13;103(24):9292-7. doi: 10.1073/pnas.0602135103. Epub 2006 Jun 2.Proc Natl Acad Sci U S A. 2006.PMID: 16751275Free PMC article.