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Kovar DR, Pollard TD.Kovar DR, et al.Proc Natl Acad Sci U S A. 2004 Oct 12;101(41):14725-30. doi: 10.1073/pnas.0405902101. Epub 2004 Sep 17.Proc Natl Acad Sci U S A. 2004.PMID: 15377785Free PMC article.