FIG. 5.
Synergistic induction of IFN-γ-responsive gene promoter. RAW cells were transfected with a luciferase reporter gene driven by the pIRE. Cell extracts were prepared and assayed for luciferase activity as described earlier (19). The data are means ± the standard errors of the means of triplicate measurements. Bars: 1, no treatment; 2, LPS (100 ng/ml); 3, IFN-γ (50 U/ml); 4, IFN-γ plus LPS.