The left panel shows major steps in the biosynthesis, processing, and maturation
of N-linked glycan chains (from ref. 4), and
the right panel shows the selective phosphorylation of N-glycans on lysosomal
enzymes, with mediates their selective targeting to lysosomes, via mannose
6-phosphate receptors (from ref. 7). Man,
mannose; GlcNAc, N-acetylglucosamine; Glc, glucose; Gal,
galactose; Fuc, fucose; Sia, sialic acid.