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Matson JS, DiRita VJ.Matson JS, et al.Proc Natl Acad Sci U S A. 2005 Nov 8;102(45):16403-8. doi: 10.1073/pnas.0505818102. Epub 2005 Oct 27.Proc Natl Acad Sci U S A. 2005.PMID: 16254052Free PMC article.