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Kitahara R, Akasaka K.Kitahara R, et al.Proc Natl Acad Sci U S A. 2003 Mar 18;100(6):3167-72. doi: 10.1073/pnas.0630309100. Epub 2003 Mar 10.Proc Natl Acad Sci U S A. 2003.PMID: 12629216Free PMC article.