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Ensslin MA, Shur BD.Ensslin MA, et al.Proc Natl Acad Sci U S A. 2007 Feb 20;104(8):2715-20. doi: 10.1073/pnas.0610296104. Epub 2007 Feb 13.Proc Natl Acad Sci U S A. 2007.PMID: 17299048Free PMC article.