Figure 10.15 Glycosidic bonds between proteins and carbohydrates. A glycosidic bond links a carbohydrate to the side chain of asparagine (N-linked) or to the side chain of serine or threonine (O-linked). The glycosidic bonds are shown in red. abbreviations: GlcNAc, N-acetylglucosamine; GalNac, N-acetylgalactosamine.