1- Glycogen Synthase: This enzyme is the primary enzyme in the synthesis of glycogen. Where it stimulates the transfer of glucose units from uridine glucose diphosphate to what is called a glycogen primer, and thus leads to the attachment of the first carbon atom of the transferred glucose to the fourth carbon atom of the last glucose in the primary glycogen chain and linked by its "alpha-4.1 glycoside link ". This process can be repeated more than once, leading to elongation of the primary glycogen until it reaches a minimum of 11 glucose units, and the chain is called the immature glycogen chain, and then comes the role of the branched enzyme.