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Biosynthetic steps in N-glycosylation. (A) shows the core glycosylation steps catalyzed by three BPA glycosyltransferases in initiation of N-glycosylation. (B) shows the reaction catalyzed by the chain capping sialyltransferase ST3GAL4 in N-glycan biosynthesis. Enzymes catalyzing core glycosylation are boxed in black, while that catalyzing chain capping is boxed in violet.
