Glycogen is a polysaccharide that has a chemical formula (C6H10O5)no.
It is formed by the condensation of glucose molecules and has branched structure.
Glycogen is present in the muscles and liver of animals. It is the main animal reserve, capable of being transformed into glucose depending on the body's need.
Generally, glycogen is also found in fungi, in this case being the main reserve substance, and in cyanobacteria, formerly called blue algae.