miRNA modulations in ATRA-treated HL-60 and arsenic-treated NB4 cells. (A) miRNAs and RARB mRNA modulations in HL-60 cells treated with 1 μM ATRA for 16 hours. (B) miRNAs and RARB mRNA modulations in NB4 cells treated with 1 μM arsenic trioxide (As2O3) for 16 hours. RT-qPCR was performed as in Figure 1.