Intracellular peroxide and glutathione content of WI-38 cells. Determination of peroxides and GSH in intact cells (WI-38 control cells or cell treated with CAPE) was accomplished by fluorescence measurement as described in the Materials and Methods section. (a) Intracellular H2O2 levels. (b) intracellular GSH levels. Data are presented as the mean ± SE of three separate experiments. Y axis represents the relative fluorescence, normalized to the fluorescence value of control cells. * P < 0.05, CAPE treated cells verse CAPE- untreated cells.