Cell viability of PC12-GFP and PC12-SH2B1β cells treated with H
. PC12-GFP or PC12-SH2B1β cells were treated with the indicated concentrations of H2O2 for 24 h. Cell viability was measured by MTT assays as described in "Materials and Methods". Values are expressed as % of control (untreated samples) for each experiment, with the values obtained for untreated cells taken as 100%. Values are expressed as mean ± S.E. from three independent experiments. The asterisks represent significant differences compared with control cells (*, p < 0.05).