Fig. 2. Neuroblastoma cells (NBP2) were plated in tissue culture dishes (60 mm), and the cells were gamma-irradiated 24 hours after plating. Vitamin E succinate or the solvent (ethanol 0.25% and sodium succinate 5 µg/mL) was added immediately before irradiation. The drugs and medium were changed after 2 days of treatment. The number of cells per dish was determined after 3 days of treatment. Each experiment was repeated at least twice involving three samples per treatment. The average value (172±7x10⁴) of untreated control NB cells was considered 100%, and the growth in treated cultures was expressed as a % of untreated controls. The bar at each point is standard error of the mean [41].