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The specific capsular antigen of Actinobacillus pleuropneumoniae serotype 9 was characterized by one-dimensional and two-dimensional high-field nuclear-magnetic-resonance methods, and by chemical analyses, as a teichoic-acid-type polymer of a repeating unit having the structure [formula: see text] The basic polymer structure is identical to capsular antigens of Neisseria meningitidis group H, Escherichia coli K62 (K2ab) and Pasteurella haemolytica serotype T15.
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Beynon et al. (1992) studied this question.
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