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The DUC switch. (A) Genetic organization. (B) Atc dose–response. Relative luminescence units (RLU) of strains in which luciferase was repressed either by SspB (red), T38 (blue), or SspB and T38 (purple) grown with different atc concentrations. Black squares represent Msm strains expressing luxAB-DAS constitutively without any regulatory components. Data are means ± SEM of six replicates. The gray area indicates autoluminescence of Msm that does not express luciferase.
