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Inhibition of miR-200a restored the sensitivity to chemotherapy. a The gemcitabine-resistant MDA-MB-231 cells showed greater resistance to gemcitabine and a lower growth inhibition ratio. b The miR-200a level is increased in gemcitabine-resistant cells. c, d miR-200a inhibitor enhanced the sensitivity of gemcitabine-resistant cells to gemcitabine. Data are presented as mean ± SD from at least three separate experiments. *p < 0.05; **p < 0.01
