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Effect of downregulating miR200a expression on the protein expression of ERK in A549 cells. p-ERK protein expression, as assessed using (A) western blot analysis and (B) statistical analysis. **P<0.01 vs. the miR-negative control-transfected A549 cells. miR, microRNA; ERK, extracellular signal-regulated kinase; p-, phosphorylated.
