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Caspase-3 activity of BEL-7402 cells after incubation with MNPs for 24 h. After BEL-7402 cells were treated with MNPs (0.05 and 1 mg/mL) for 24 h, caspase-3 activity was determined using caspase-3/CPP32 Colorimetric Assay Kit. *P < 0.05 vs. control; **P < 0.01 vs. control.
