The effects of combinations of IL-4, GM-CSF, and IFN-γ on the IL-12 production by mouse splenic DCs. Mouse splenic DCs were cultured with a mix of stimuli as used in in the presence or the absence of IL-4, IFN-γ, or GM-CSF, for 23 h. The supernatants were analyzed for IL-12 p70 and p40 by ELISA (A and B) and Western blotting (C). The result is typical of more than five similar experiments with ELISA readouts and Western blotting.