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Polysaccharides are large macromolecules made up of multiple monosaccharides joined together by covalent bonds called glysidic linkages. Glycogen is the primary polysaccharide demonstrated in animal/human tissue samples via histology staining technique.

The histochemical assessment of glycogen in tissue samples is often used to diagnose glycogen storage diseases characterized by an abnormal accumulation of glycogen in the liver or skeletal and cardiac muscles.