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Norris EH, Strickland S.Norris EH, et al. Among authors: strickland s.Proc Natl Acad Sci U S A. 2007 Aug 14;104(33):13473-8. doi: 10.1073/pnas.0705848104. Epub 2007 Aug 2.Proc Natl Acad Sci U S A. 2007.PMID: 17673549Free PMC article.