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Protein Kinases. Enzymes that catalyse phosphorylation reactions on protein substrates500-2000 estimated protein kinases in a cellProtein kinases are present in the cytoplasmProtein kinase receptors - dual role as receptor and enzymeOverexpression can result in cancerTyrosine kinases, serine-threonine kinases and histidine kinasesATP used as enzyme cofactor - phosphorylating agent.
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