Inhibition of cell death by zVAD-fmk, zFA-fmk, DMSO and NAC. OHS cells were cultivated in the presence or absence of 100 u/ml IFN-γ and the indicated inhibitors for 72 hours, and cell viability was measured as described in "Materials and Methods". All values are given as a percentage of viable cells relative to corresponding cells treated with the indicated inhibitor, but without IFN-γ-treatment. Data are mean values ± S.D. The results represent at least three independent experiments performed in triplicate. *, p < 0.001 and **, p < 0.05 as compared to IFN-γ-treated cells without inhibitor.