Heteropolysaccharide is a kind of polysaccharide. Heteropolysaccharides containing the repeating units of amino sugars and uronic acid are known as mucopolysaccharides or GAGs. Glycoproteins or mucoproteins are proteins with carbohydrate units made up of a short (2–10 sugar residues) chain. Proteoglycans is a heteropolysaccharide connected to a polypeptide. Glycolipids are lipids containing a carbohydrate group.