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SDS-PAGE analysis of beta-casein (ca) hydrolyzed for the times indicated (in minutes) by whole cells of L. lactis MG1363 producing full-length PrtB, PrtBδ99, or PrtBδ806. Beta-casein was also hydrolyzed by culture supernatants of L. lactis MG1363 synthesizing full-length PrtB or PrtBδ99.
