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Definitions of O Antigens

  1.   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