PKC (Protein Kinase-C) is a cyclic nucleotide-independent enzyme that phosphorylates serine and threonine residues in many target proteins. PKC plays a pivotal role in mediating cellular responses to extracellular stimuli involved in proliferation, differentiation, apoptosis, and exocytotic release in a number of non-neuronal systems such as Islet cells, Chromaffin cells and Paramecium. PKC has also been implicated in phosphorylation of several neuronal proteins, which are thought to regulate neurotransmitter release and establi...