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PP1 plays a crucial role in the regulation of blood-glucose levels in the liver and glycogen metabolism. PP1 is important to the reciprocal regulation of glycogen metabolism by ensuring the opposite regulation of glycogen breakdown and glycogen synthesis. Phosphorylase a serves as a glucose sensor in liver cells. PP1 comprises a catalytic subunit, PPP1CA, PPP1CB or PPP1CC, which is folded into its native form by inhibitor 2 and glycogen synthetase kinase 3, and then complexed to one or several targeting or regulatory subunits. PPP1R12A, PPP1R12B and PPP1R12C mediate binding to myosin.<br /><br />Myosin phosphatase target subunit 1 (MYPT1) can regulate the contraction and relaxation of vascular smooth muscle and maintains blood pressure.