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TGF-β is long known to require Ras activation to induce EMT. In a recent issue of Nature, Massagué and colleagues (Su et al., 202 identify RAS-responsive element binding protein 1 (RREB1) as a critical integrator of TGF-β and Ras signals during both developmental and cancer EMT programs. Chromosomes containing two centromeres (dicentrics) trigger chromosome instability that is avoided by the enigmatic process of centromere inactivation. In this issue of Developmental Cell, Palladino et al. (202 combine in vivo chromosome engineering