SEARCH Articles Figures Tables Covalent Modifications of Enzymes and Cascade Effect Covalent modification Covalent modification of enzyme Covalent modifications to regulate enzyme activity Enzyme regulation by covalent modification Enzyme regulation covalent modification Enzyme regulation reversible covalent modification Enzymes reversible covalent modification Enzymic modification Metabolic regulation covalent enzyme modification Responses to fast-acting hormones by covalent modification of enzyme proteins