<unk> s <unk> s) or mucopolysaccharides are long unbranched polysaccharides consisting of a repeating disaccharide unit. The repeating unit (except for keratan) consists of an amino sugar (N-acetylglucosamine or N-acetylgalactosamine) along with a uronic sugar (glucuronic acid or iduronic acid) or galactose.<unk> s are highly polar and attract water.  They are therefore useful to the body as a lubricant or as a shock absorber.
Glycosaminoglycan
Sarcoglycan
Glycoprotein
Phospholipid
Muconic acid
Glycerophospholipid
Lecithin
Heparan sulfate