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Effect of miR-21 on colon cancer SW480 cell proliferation. Proliferation of SW480 cells was determined by MTT assay. The OD values of the two groups of cells increased with time, and the OD values at 6, 24, 48, and 72 h after the miR-21 expression vector transfection (positive group A) were higher than those of cells with blank vector transfection (negative group B) (P<0.05). MTT, methyl thiazolyl tetrazolium.
