The phosphorylation and dephosphorylation of proteins are very important and critical processes in the cells. In the biological pathways, these processes often function as molecular on/off switches for key regulators within the cells such as signal transduction, cell division and apoptosis. For studying the phosphorylation signaling events effectively, endogenous phosphatases must be inactivated to prevent their uncontrolled activity when the cells are lysed. Our Phosphatase Inhibitor Cocktails are optimized to preserve the odification of phosphoproteins by significantly reducing the activities of the endogenous phosphatases. CLS