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Chan F, Bradley A, Wensel TG, Wilson JH.Chan F, et al.Proc Natl Acad Sci U S A. 2004 Jun 15;101(24):9109-14. doi: 10.1073/pnas.0403149101. Epub 2004 Jun 7.Proc Natl Acad Sci U S A. 2004.PMID: 15184660Free PMC article.