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Methylation studies of Shigella flexneri lipopolysaccharides indicate that the primary side chains of the O‐specific regions of these polymers have saccharide repeating units with the structure N ‐acetylglucosaminyl‐(1 → 2)‐rhamnosyl‐(1 → 2)‐rhamnosyl‐(1 → 3)‐rhamnose or N ‐acetyl‐glucosaminyl‐(1 → 2)‐rhamnosyl‐(1 → 3)‐rhamnosyl‐(1 → 2)‐rhamnose. The repeating units are bound together by (1 → 3)‐linkages.
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Lindberg et al. (1973) studied this question.
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