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(a) Schematic structure of Salmonella LPS, consisting of a lipid A membrane anchor, a common core of carbohydrates and a varying number of 4 to 30 O-antigenic repeats. (b) Chemical structure of Salmonella O-antigenic repeats of serotypes A (Par, paratose), B (Abe, abequose) and D1 (Tyv, tyvelose) α-(1,3)-linked to Man of the trisaccharide repeat α-Man-(1–4)-α-Rha-(1–3)-α-Gal. Randomly α-(1–4)-linked Glc represents O-antigen 122. The arrow marks the cleavage site.
