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| O Antigens O-Specific Polysaccharides | O Antigen | O Antigen, Bacterial | O-Antigens | O-Specific Polysaccharide | Antigen, Bacterial O | Antigen, O | Antigens, O | Bacterial O Antigen | O Specific Polysaccharide | O Specific Polysaccharides The lipopolysaccharide-protein somatic antigens, usually from gram-negative bacteria, important in the serological classification of enteric bacilli. The O-specific chains determine the specificity of the O antigens of a given serotype. O antigens are the immunodominant part of the lipopolysaccharide molecule in the intact bacterial cell. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed) |