Figure 3.

N-linked and O-linked viral glycoproteins. The viral N-linked glycoproteins include both high mannose and complex types. The high mannose glycoprotein shown above has already lost its three glucose residues and two of its mannose residues. The arrows indicate sites of cleavage by glycosidases: 1: Endoglycosidase H; 2: Endoglycosidase F; 3: Endo-alpha-N-acetylgalactosamidase; 4: Neuraminidase. GlcNAc: N-acetylglucosamine; Man: mannose; Gal: galactose; Sialic: sialic acid; GalNAc: N-acetylgalactosamine