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Growth of L. monocytogenes Scott A Nisr (A) and wild-type (B) strains in B-BHI broth at 4°C. Closed symbols indicate results in air; open symbols indicate results in 100% CO2. Squares represent cultures in the absence of nisin, and circles represent cultures in the presence of nisin (2.5 μg/ml). Vertical bars represent the means and standard deviations from two independent experiments.
