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Abstract
The transforming growth factor–β (TGF-β) pathway mediates critical events in cell behavior that contribute to development and disease. The mitotic checkpoint guarantees faithful chromosomal segregation during cell division. In the 6 January 2015 issue of Science Signaling, Nyati et al. reported that the mitotic checkpoint kinase BUB1 promotes the activity of TGF-β receptors, which adds new molecular links between these fundamental biological processes.