FIG 3.

Effector-encoding genes regulated by Fis are expressed at higher levels at stationary phase. The expression levels of effector translational lacZ fusions (the effectors examined are indicated below the bars) were examined in the wild-type strain (JR32) at the exponential phase (white bars) and at the stationary phase (gray bars). β-Galactosidase activity was measured as described in Materials and Methods. Data (expressed in Miller units [M.U.]) are the averages ± standard deviations (error bars) of the results of at least three different experiments. The effector-encoding genes were divided according to their levels of expression.