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Hoffert JD, Pisitkun T, Wang G, Shen RF, Knepper MA.Hoffert JD, et al.Proc Natl Acad Sci U S A. 2006 May 2;103(18):7159-64. doi: 10.1073/pnas.0600895103. Epub 2006 Apr 25.Proc Natl Acad Sci U S A. 2006.PMID: 16641100Free PMC article.