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Immunoblot of anti-37-kDa MAb 4E9 to whole-cell antigen preparations of 11 of the 23 capsular serotypes in the licensed pneumococcal polysaccharide vaccine and one additional capsular serotype (serotype 25). The serotypes are indicated above each lane. MAb 4E9 revealed an antigen at 37 kDa in all serotypes tested.
