糖胺聚糖

Also known as GAGs, glycosaminoglycans

class=skin-invert-image|thumb|240px|right|The repeating disaccharide unit (GlcUA(1β→3)GalNAc(1β→4))n of chondroitin sulfate. For polysaccharide nomenclature see here. R1, R2, R3 may have different values. Glycosaminoglycans (GAGs) or mucopolysaccharides are long, linear polysaccharides consisting of repeating disaccharide units (i.e., two-sugar units). The repeating two-sugar unit consists of a uronic sugar and an amino sugar, except in the case of the sulfated glycosaminoglycan keratan, where, in place of the uronic sugar there is a galactose unit. GAGs are found in vertebrates, invertebrates