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Colonies of recombinant L. lactis grown on GM17 agar medium containing suspended L. monocytogenes cells. The control strain MG1363(pLC-PL511) shows no lytic effect (A), whereas strain L. lactis MG1363(pSL-PL511ΔC) secreting the C terminally truncated Ply511 enzyme shows clear zones of lysis around the individual colonies (B).
