Inhibition of CD10 expression by treatment with VAD-FMK. H9 T cells were cultured with CD95 MoAb in the presence or absence of VAD-FMK (10 μmol/L, final concentration) for 24 or 48 hours. Control suspensions were cultured with medium alone. At the end of the culture period, the cells were obtained and stained with CD10 MoAb and Annexin-V-FITC or an irrelevant MoAb and Annexin-V-FITC.