FIG 3.

Pyocyanin and elastase activity were decreased upon Pf4 phage variant infection. The relative quantifications (± the SEM) of pyocyanin production and elastase activity, determined by absorbance measurement at 520 nm and by elastolytic activity assay, respectively, in H103 (green bars) and Pf4*-T (violet bars) condition are shown. All measures were normalized to the A₅₈₀. Pyocyanin and elastase experiments were assayed four times independently. Statistics were achieved by using a paired (two sample) two-tailed t test (***, P < 0.001).