A class of protein-serine-threonine kinases that was originally found as one of the three types of kinases that phosphorylate GLYCOGEN SYNTHASE. Glycogen synthase kinases along with CA(2+)-CALMODULIN DEPENDENT PROTEIN KINASES and CYCLIC AMP-DEPENDENT PROTEIN KINASES regulate glycogen synthase activity.

Synonyms: Glycogen Synthase Kinases, Kinases, Glycogen Synthase, Glycogen Synthase Kinase, Kinase, Glycogen Synthase, EC 2.7.11.-, Synthase Kinase, Glycogen