FIG. 3.

Comparison of expression levels of SPI2 genes and genes encoding SPI2 effector proteins. The reporter fusions were analyzed in the background of the S. enterica serovar Typhimurium wild type or in ssrB strains. The reporter strains were grown under SPI2-inducing conditions, and the luciferase activity was determined at various time points as described for Fig. 2. The histogram shows the maximal expression levels for representative reporter fusions. The numbers indicate fold SsrB-dependent activation.