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Western immunoblot of pneumococcal lysates. Panel A was developed with anti-PspC polyclonal serum, and panel B was developed with anti-PspA MAb Xi126. An asterisk indicates PspC proteins, and a circle indicates PspA proteins. Molecular mass markers (in kilodaltons) are indicated on the right. Cross-reaction of the polyclonal serum to PspC was observed with all strains tested, but the polyclonal serum reacted weakly to the PspA molecule from L81905.
