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Effects of IL-4 and IFN-γ on dendritic cells (DC). Naive DC were incubated in the absence or presence of IL-4 (10 ng/ml) and assayed for 3H-thymidine incorporation (a) and IFN-γ production (b). Naive DC were incubated and detected for nitric oxide (NO) production in response to IFN-γ (100 U/ml) (c). Two independent experiments revealed similar results. *P < 0.05; ***P < 0.001.
