Figure 2.

Structures of O-linked hexa- and tris-saccharide and N-linked Bi (biantennary) and Tri (triantennary) oligosaccharides attached to regular hCG, hyperglycosylated hCG and hyperglycosylated hCG free β [18-20]. NeuAc is N-acetylneuraminic acid or sialic acid, GalNAc in N-acetylgalactosamine, Gal is galactose, GlcNAc is N-acetylglucosamine, Man is mannose and Fuc is fucose.