FIG. 3.

Bile-mediated repression of sirC transcription is dependent upon SirA. Cultures were grown to log phase (OD₆₀₀ = 0.6) in LB broth or in LB broth with the addition of 3% bile, washed, and examined for firefly luciferase activity. The data correspond to a single experiment of three independent assays that gave similar results.