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Al-Hajj M, Becker MW, Wicha M, Weissman I, Clarke MF.Al-Hajj M, et al.Curr Opin Genet Dev. 2004 Feb;14(1):43-7. doi: 10.1016/j.gde.2003.11.007.Curr Opin Genet Dev. 2004.PMID: 15108804Review.