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Comparison of autolysis of L. lactis strains MG1363 (▴), MG1363 acmAΔ1 (▵), IL1403 (▪), and IL1403 acmA::ISS1 (□). Cells were grown in GM17 broth, and cellular lysis was subsequently followed by measuring PepX activity (in arbitrary units[AU]) (see the Materials and Methods section) released into the culture medium in time.
