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Schematic representation of the oligosaccharide structure of mucins. The carbohydrate chain is O-glycosidically linked to the apomucin through N-acetylgalactosamine (GalNAc). Galactose (Gal), N-acetylglucosamine (GlcNAc), sialic acid (Neu5Ac), sulfate (SO32−), and fucose (Fuc) residues are indicated. The structure of 9-O-acetylated sialic acid is shown as a structural formula (constructed from data presented in reference 49).
