O ANTIGEN
\ˈə͡ʊ ˈantɪd͡ʒˌɛn], \ˈəʊ ˈantɪdʒˌɛn], \ˈəʊ ˈa_n_t_ɪ_dʒ_ˌɛ_n]\
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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)
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