Figure 6. Effects of DTMUV infection on the caspase family. (A) mRNA expression levels of caspase-3, caspase-7, caspase-8 and caspase-9. (B) Activities of caspase-3, caspase-7, caspase-8 and caspase-9. The data are presented as the means ± SD of three independent experiments. * p<0.05, ** p<0.01 and *** p<0.0001, compared with the control group.