Figure 2

recA -driven β-glucuronidaseactivity. Levels of β-glucuronidase activity in S. thermophilus strain Sfi39 containing the translational recA::gusA. Samples were harvested from exponentially growing cells, from exponential cells exposed to a sublethal concentration (200 ng/ml) of mitomycin C [10] or to heat-shock or nutrient starvation. Data are the average of three independent experiments.