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O‐antigen representing the O‐polysaccharide chain of the lipopolysaccharide is the most variable constituent on the cell surface of Gram‐negative bacteria and a player in their pathogenicity. The O‐polysaccharide of Escherichia coli O109 was studied by sugar analysis and nuclear magnetic resonance spectroscopy and found to contain a rarely occurring monosaccharide, 2,3‐diacetamido‐2,3,6‐trideoxy‐l‐mannose...
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