OHS cells are more sensitive than II-11b cells to IFN-γ-mediated suppression of cell viability. Cell viability was measured in OHS cells (A) and II-11b cells (B) after treatment with the indicated concentrations of IFN-γ for 24, 48 and 72 hours. In each experiment, untreated control cells were included at all time points, and all values are given as a percentage of corresponding untreated control cells. The results are presented as mean values ± S.D. of at least three independent experiments performed in triplicate. *, p < 0.0001 and **, p < 0.05 as compared to untreated control cells.