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Immunoblot assay of purified LOS of M. catarrhalis strain 87P15B1 (all lanes). Lanes were probed with aliquots of homologous postclearance serum sample 87E16 as follows: a, unadsorbed; b, adsorbed with M. catarrhalis strain 87P15B1; c, adsorbed with E. coli; d, serum fraction eluted from the surface of M. catarrhalis strain 87P15B1. Antibodies were detected with peroxidase-conjugated anti-human IgG. The positions of molecular mass markers (in kilodaltons) are shown on the left.
