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Ohi MD, Ren L, Wall JS, Gould KL, Walz T.Ohi MD, et al. Among authors: ren l.Proc Natl Acad Sci U S A. 2007 Feb 27;104(9):3195-200. doi: 10.1073/pnas.0611591104. Epub 2007 Feb 20.Proc Natl Acad Sci U S A. 2007.PMID: 17360628Free PMC article.