The influence of PML-RARα fusion protien on the transcriptional activity of the (CACA) 9-lux reporter gene plasmid in NB4 cells. In the first group, with plasmid (CACA) 9-lux (nine Smad3 repeat sequences included). In the second group, with (CACA) 9-lux and empty vector, and in the third group, with (CACA) 9-lux and plasmid PML-RARα. The transcriptional activity of the third group was lower than the other two groups. (p<0.05)