Fig. 10. Effect of d--tocopheryl succinate (vitamin E succinate) in combination with sodium butyrate on the growth of neuroblastoma cells in culture. Cells (50,000 cells/60 mm dish) were plated in tissue culture dishes, and vitamin E succinate and sodium butyrate were added one after another 24 hours later. Fresh growth medium and agents were changed at two days after treatment and growth was determined at three days after treatment. Each value represents an average of six samples. The bar at each point is SEM [57].