sentence1: We then sought to reassess the regulation of miR-223 in the exactly same experimental system adopted in the previous work
sentence2: Importantly, our reassessment revealed that this conserved promoter is probably active in the induction of miR-223 during All-trans retinoic acid (ATRA)-induced differentiation of the APL cell line, NB4 cells, which is the main experimental system adopted in the previous study