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PRRSV induced the apoptosis of the PTR2 cells. Apoptosis ratio analysis of the PTR2 cells with different treatments. The 5 μM carbonyl cyanide m-chlorophenyl hydrazine (CCCP) for 30 min was used as the positive control and untreated cells were used as the negative control. The experimental group was infected with different doses of PRRSV (A). Bars show the ratio of normal cells, early apoptotic cells, and late apoptotic cells in each group (B). ** p < 0.01 and *** p < 0.001.
