<prompt> Enzyme regulated by phosphorylationGlucokinaseGlycogen synthetasePyruvate dehydrogenaseIsocitrate  <response>: Glycogen Synthase catalyzes elongation of glycogen chains. Glycogen Synthase catalyzes transfer of the glucose moiety of UDP-glucose to the hydroxyl at C4 of the terminal residue of a glycogen chain to form a 1 4 glycosidic linkage diagrams p. 633:glycogen n residues UDP-glucose glycogen n 1 residues UDPRef: DM Vasudevan, 6th edition, page no: 106 