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Let-7a is markedly downregulated in A549 and H1299 cells. (A) Let-7a expression in A549, H1299 and control HBE cells was revealed by qRT-PCR, *P<0.001. (B and C) The levels of let-7a were detected after let-7a-mimic and let-7a-inhibitor transfection in A549 and H1299 cells. *P<0.05, vs. the scrambled control group.
