Fig. 4From: PD-1/PD-L1 axis induced host immunosuppression via PI3K/Akt/mTOR signalling pathway in piglets infected by Glaesserella ParasuisDetermination of the CD3 (A), CD4 (B), CD8 (C) expression at mRNA level by RT-PCR. ** p < 0.01*; *** p < 0.001Back to article page