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Gnanapragasam MN, Scarsdale JN, Amaya ML, Webb HD, Desai MA, Walavalkar NM, Wang SZ, Zu Zhu S, Ginder GD, Williams DC Jr.Gnanapragasam MN, et al. Among authors: scarsdale jn.Proc Natl Acad Sci U S A. 2011 May 3;108(18):7487-92. doi: 10.1073/pnas.1015341108. Epub 2011 Apr 13.Proc Natl Acad Sci U S A. 2011.PMID: 21490301Free PMC article.