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Effect of Tan IIA pretreatment on H9c2 cells viability following Nrf2-siRNA transfection. The cell viability was measured by MTT. Data are presented as mean ± standard error of the mean (n=3). **P<0.01 vs. control; ##P<0.01 vs. DOX; &&P<0.01 vs. DOX+Tan IIA. DOX, doxorubicin; Tan IIA, tanshinone IIA; Nrf2, nuclear factor (erythroid-derived 2)-like 2; siRNA, small interfering RNA; NC, siRNA negative control.
