Fig. 3.
(A) Effects of As2O3, RA, or their combination on the NBT-reducing activity of NB4 and NB4-AsR cells. Aliquots of 5 × 105 cells were treated for 3 days as indicated under the plot. (B) Effects of As2O3, RA, or the combination of the two compounds on LAP enzymatic activity. Aliquots of 106 cells were treated with RA, As2O3, or the combination of 10−6 mol/L RA plus As2O3 for 3 days. Each value represents the mean ± SD of three independent measurements.