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Donohoe BS, Kang BH, Staehelin LA.Donohoe BS, et al.Proc Natl Acad Sci U S A. 2007 Jan 2;104(1):163-8. doi: 10.1073/pnas.0609818104. Epub 2006 Dec 21.Proc Natl Acad Sci U S A. 2007.PMID: 17185411Free PMC article.