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Rens W, Grützner F, O'brien PC, Fairclough H, Graves JA, Ferguson-Smith MA.Rens W, et al. Among authors: graves ja.Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16257-61. doi: 10.1073/pnas.0405702101. Epub 2004 Nov 8.Proc Natl Acad Sci U S A. 2004.PMID: 15534209Free PMC article.