Fig. 2.
Effects of As2O3 on tRA-induced differentiation in NB4 cells.
(A) Growth inhibition. NB4 cells were treated with 0.5 μM As2O3 with or without tRA at indicated concentrations for 4 days. (B) Differentiation. The NB4 cells were treated with indicated concentrations of tRA with or without 0.5 μM As2O3 for 4 days. NBT reduction was used to measure differentiation.