Figure 3.

Up-regulation of costimulatory molecules on DCs by S. typhimurium. Bone marrow-derived DCs were analyzed before any treatment by flow cytometry (thin line). The cells were then incubated for 3 h in medium alone (dotted line) or with S. typhimurium PhoP^c (bold line), washed, further cultivated for 18 h, and then analyzed. The mean fluorescence obtained after staining with secondary antibodies alone was <10. Results are representative of five different experiments.