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Luciferase activity recorded as relative light units (RLU) of L. lactis subsp. lactis LAC182 cells induced for 3 h with different amounts of nisin diluted in 0.1% Tween 80 (●) or milk (○) with or without 0.1% Tween 80. The nisin concentrations are given as final assay concentrations. The result shown is the mean and standard deviation from five experiments.
