Symbolic representation of different N-linked glycans. High mannose, complex and hybrid are three major N-linked glycan types; all derived from the common precursor Glc3Man9GlcNAc2. These glycans are made of N-acetyl glucosamine (GlcNAc), mannose (Man), glucose (Glc), Galactose (Gal), N-acetyl neuraminic acid (Neu5Ac), and fucose (Fuc).