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We investigated the ability of hydrogen peroxide (H2O2) to cause apoptotic cell death in cultured rat forebrain neurons and the potential mechanisms by which oxidative stress triggers delayed neuronal death. H2O2 (25 μM for 5 min) reduced cell viability to 34.5 ± 8.3% of untreated controls 20 h after exposure, and resulted in a significant proportion of neurons which exhibited apoptotic nuclear morphology...