Glycosaminoglycan

**Semantic type:** Biologically Active Substance|Organic Chemical

**Definition:** Linear polysaccharides composed of disaccharide repeating units of glycosamine-glycans, two monosaccharide units (hexosamine and the repeating disaccharide of either hexuronate or galactose) located on the surface of cells or in the extracellular matrix contributing to adhesion, elasticity, and viscosity of extracellular substances.

**Synonyms:** - GAG - Mucopolysaccharide - glycosaminoglycan