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Smith TM, Tafforeau P, Reid DJ, Grün R, Eggins S, Boutakiout M, Hublin JJ.Smith TM, et al.Proc Natl Acad Sci U S A. 2007 Apr 10;104(15):6128-33. doi: 10.1073/pnas.0700747104. Epub 2007 Mar 19.Proc Natl Acad Sci U S A. 2007.PMID: 17372199Free PMC article.