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Structures of three categories of N-linked oligosaccharides in IgG1 CH2. Subscripts indicate the absence (0) or presence (1 and X) of corresponding monosaccharide. X represents a number that is equal or greater than 1 of this monosaccharide. Abbreviations: Gal, galactose; GlcNAc, N-acetylglucosamine; Man, mannose; Fuc, fucose; Sia, sialic acid.
