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Campbell IG, Grimm KJ, de Bie E, Feinberg I.Campbell IG, et al. Among authors: grimm kj.Proc Natl Acad Sci U S A. 2012 Apr 10;109(15):5740-3. doi: 10.1073/pnas.1120860109. Epub 2012 Mar 26.Proc Natl Acad Sci U S A. 2012.PMID: 22451933Free PMC article.