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Let-7 inhibits NPC cell proliferation. NPC cells (HK1 and HONE1) were transfected with let-7 (-a, -b, -d, -e, -g, and -i) precursors, and the proliferation rate were measured with MTS assay after 72 h. All tests were performed in triplicate. The data were expressed as mean value with standard deviations. ** P < 0.001, * P < 0.05
