Glycogen phosphorylase is the primary enzyme of glycogen breakdown. Glycogen synthase is an enzyme that is responsible in glycogen synthesis. Glycogen can be converted into glucose 6-phosphate as well with the help of glycogen phosphorylase. Other means include the degradation of glycogen (glycogenolysis) and fatty acid catabolism. Liver cells store carbohydrates in the form of glycogen. It is also required for muscle phosphorylase activity associated with glycogen metabolism. Glycogenin is an enzyme involved in converting glucose to glycogen. They include molecules such as adenosine triphosphate (ATP), glycogen and creatine phosphate. K leads to crucial metabolic functions such as synthesis of lipids, proteins and glycogen. Cellulose is similar in form to complex carbohydrates like starch and glycogen. Lactate can also be used as an indirect precursor for liver glycogen. Insulin acts on the hepatocytes to stimulate the action of several enzymes, including glycogen synthase. This amplifies the effect of activating glycogen phosphorylase. A has several functions in the cell, including regulation of glycogen, sugar, and lipid metabolism. Periodic acid-Schiff is a histology special stain used to mark carbohydrates (glycogen, glycoprotein, proteoglycans).