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Listeria monocytogenes with lacZ fusions with pprfA, pplcA, pinlA, and phly promoters (from left to right, respectively) diluted 1,000-fold and cast in BHI (upper row) and BHI-AC (lower row). Overfladedesinfektion was added at decreasing concentrations in wells 1 to 6 from right to left. Water was added as control (K) and did not alter the color of the agar. The results presented are representative of two independent experiments.
