Fig. 1. Time course of lipopolysaccharide (LPS) plus interferon γ (IFN-γ)–reduced cell viability. Rat NR8383 macrophages were incubated with or without 100 ng/ml LPS plus 50 U/ml IFN-γ for various times. Cell survival was assessed by trypan blue exclusion test. Results are mean ± SD (n = 4). * P < 0.05 compared with the corresponding cells without the exposure to LPS plus IFN-γ.