FIG 2.

Cytotoxicity of supernatant (circles) and cell-associated (triangles) fractions of overnight cultures of TW08571 grown in the absence or presence of 15 ng/ml Cip. Each wide horizontal bar indicates the median CD₅₀ (log) from five experiments, and error bars represent standard deviations. A significant difference was found between supernatant fractions with no Cip and those with 15 ng/ml Cip (P < 0.0001), while the difference between cell-associated fractions with no Cip and those with 15 ng/ml Cip was not significant, by Tukey’s multiple-comparison test.