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(A) Core oligosaccharide of C. jejuni 81-176 (serogroups O:23/O:36) and the phosphorylated disaccharide backbone of lipid A (determined for strain CCUG 10936) (23). The structure of 81-176 LOS has been reported to vary between the structure shown in panel A, which mimics GM3 ganglioside (B), and a structure lacking the terminal GalNAc, which mimics GM2 ganglioside (C). This variation is due to slip strand mismatch repair of the cgtA gene, encoding a GalNAc transferase (12).
