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Virulence-associated phenotypes of pbp mutants in vitro. (A) Pyocyanin production of pbp mutants. (B) Static biofilm formation on pegged lids. Data are presented as the mean ± SE from three independent experiments. Student's t test was performed for determination of the significance of the differences between the wild type and the pbp mutants. **, P < 0.001; ***, P < 0.0001.
