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Calderone CT, Bumpus SB, Kelleher NL, Walsh CT, Magarvey NA.Calderone CT, et al. Among authors: bumpus sb.Proc Natl Acad Sci U S A. 2008 Sep 2;105(35):12809-14. doi: 10.1073/pnas.0806305105. Epub 2008 Aug 22.Proc Natl Acad Sci U S A. 2008.PMID: 18723688Free PMC article.