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Motility phenotype of PA45B and isogenic mutants. The relative motility of each strain compared to that of wild-type PA45B was determined by measuring the diameter of the swimming zone after incubation at 37°C for 16 h. **, P = 0.0037; ****, P < 0.0001. Data were obtained from three independent experiments; error bars indicate standard deviations. Statistical analysis was performed using an unpaired, two-tailed t test.
