"Here the authors show in vitro and in Drosophila that Protein Phosphatase 1 (PP1) inactivates Mps1 by dephosphorylating its T-loop. PP1-mediated dephosphorylation of Mps1 occurs at kinetochores and in the cytosol and inactivation of both pools of Mps1 during metaphase is essential to ensure prompt and efficient Spindle Assembly Checkpoint silencing."xsd:string