FIG 3.

Promoter activities of leukocidins and regulators. Activities of the lukAB (A), lukSF-pv (pvl) (B), saeP3 (C), and agrP3 (D) promoters in the WT and atl mutant at the exponential (3 h) and early-stationary (4.5 h) phases. The indicated promoters were fused to gfp or yfp genes. The promoter activities were measured as fluorescence and normalized by OD₆₀₀. Data show mean ± SEM from 4 independent experiments. *, P ≤ 0.05; **, P ≤ 0.01; ***, P ≤ 0.00 by two-way ANOVA with Sidak multiple-comparison test.