<unk> s are proteins that contain oligosaccharide chains <unk> lycans) covalently attached to their polypeptide backbones. Basically,<unk>  is a biomolecule composed of a protein and a carbohydrate (an oligosaccharide). The carbohydrate is attached to the protein in a cotranslational or posttranslational modification.
In proteins that have segments extending extracellularly, the extracellular segments are often<unk> lycosylated.
Glycoprotein
Muconic acid
Glycolipid
Glycosaminoglycan
Phospholipid
Mucin
Diatomic molecule
Lecithin