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Schematic presentation of N. meningitidis LOS. The α chains of L2, L3, L4, L5, L7, and L9 LOSs contain LNnT structures (14). The alternative α chain of L1 LOS is a trisaccharide, Galα1-Galβ1-Glc. The L6 LOS lacks the terminal Gal in the LNnT structure, and the L8 LOS is a lactosyl disaccharide (20). The terminal Gals of LNnT and the L1 trisaccharide are often partially sialylated. Ac, acetyl residue.
