FIG. 4.

Hemolysin activities of wild-type P. mirabilis (N2), the ugd knockout mutant (dU2), the Ugd-complemented strain (dU2c), the galU knockout mutant (dG1), and the GalU-complemented strain (dG1c). Hemolysin activity was determined at different time points after seeding the strains on LB agar plates. The value obtained with the wild-type cells at 4 h postseeding was set at 100%, and all other values were expressed relative to this value. The data represent the averages of results of three independent experiments with standard deviations.