<P> Glycogen is analogous to starch, a glucose polymer in plants, and is sometimes referred to as animal starch, having a similar structure to amylopectin but more extensively branched and compact than starch . Glycogen is a polymer of α (1 → 4) glycosidic bonds linked, with α (1 → 6) - linked branches . Glycogen is found in the form of granules in the cytosol / cytoplasm in many cell types, and plays an important role in the glucose cycle . Glycogen forms an energy reserve that can be quickly mobilized to meet a sudden need for glucose, but one that is less compact and more immediately available as an energy reserve than triglycerides (lipids). </P> <P> In the liver hepatocytes, glycogen can compose up to eight percent (100--120 g in an adult) of the fresh weight soon after a meal . Only the glycogen stored in the liver can be made accessible to other organs . In the muscles, glycogen is found in a low concentration of one to two percent of the muscle mass . The amount of glycogen stored in the body--especially within the muscles, liver, and red blood cells--varies with physical activity, basal metabolic rate, and eating habits such as intermittent fasting . Small amounts of glycogen are found in the kidneys, and even smaller amounts in certain glial cells in the brain and white blood cells . The uterus also stores glycogen during pregnancy, to nourish the embryo . </P> <P> Glycogen is composed of a branched chain of glucose residues . It is stored in liver and muscles . </P> <Ul> <Li> It is an energy reserve for animals . </Li> <Li> It is the chief form of carbohydrate stored in animal body . </Li> <Li> It is insoluble in water . It turns brown - red when mixed with iodine . </Li> <Li> It also yields glucose on hydrolysis . </Li> </Ul>

Cellulose and starch are examples of which type of biomolecule