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Kinase

(Science: enzyme molecular biology) Widely used abbreviation for phosphokinase, an enzyme catalysing transfer of phosphate from atp to a second substrate usually specified in less abbreviated name, for example creatine phosphokinase (creatine kinase), protein kinase. Serine / threonine kinases phosphorylate on serine or threonine residues, tyrosine kinases on tyrosines.