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Immunodetection of cells (A) or culture supernatants (B) of L. lactis MG1363 (Ll) synthesizing the full-length PrtB or its truncated forms (PrtBδ99, PrtBδ168, PrtBδ247, and PrtBδ806). PrtB and truncated derivatives were revealed by using anti-PrtB serum. Molecular mass markers in kilodaltons are indicated.
