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Xu J, Pope SD, Jazirehi AR, Attema JL, Papathanasiou P, Watts JA, Zaret KS, Weissman IL, Smale ST.Xu J, et al. Among authors: zaret ks.Proc Natl Acad Sci U S A. 2007 Jul 24;104(30):12377-82. doi: 10.1073/pnas.0704579104. Epub 2007 Jul 18.Proc Natl Acad Sci U S A. 2007.PMID: 17640912Free PMC article.