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Overexpression of miR-99a inhibited proliferation of MCF-7 cells. (A) qRT-PCR of miR-99a in MCF-7 cells transfected with miR-99a or the scramble control sequence. (B) Cell viability was determined by CCK8 assay in MCF-7 cells. (C,D) Cell viability was determined by colony formation assay in MCF-7 cells. Means of three independent experiments ± SEM were shown (*P < 0.05 and **P < 0.01).
