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Champion HC, Bivalacqua TJ, Takimoto E, Kass DA, Burnett AL.Champion HC, et al.Proc Natl Acad Sci U S A. 2005 Feb 1;102(5):1661-6. doi: 10.1073/pnas.0407183102. Epub 2005 Jan 24.Proc Natl Acad Sci U S A. 2005.PMID: 15668387Free PMC article.