Fig. 3From: Pulmonary endothelium-derived PD-L1 induced by the H9N2 avian influenza virus inhibits the immune response of T cellsThe levels of IFN-γ and TNF-α in the RPMECs. The RPMECs were infected with the live H9N2 virus at an MOI of 1 or 5, and then the supernatants were collected at 12 h and 24 h postinfection. The levels of IFN-γ and TNF-α were detected using ELISA kits according to the instructions of the ELISA kits. The values represent the means of three independent experiments plus the standard deviations. a IFN-γ levels in the RPMECs. b TNF-α levels in the RPMECs. * Statistical analysis among the H9N2 virus group(MOI=1), the H9N2 virus group (MOI=5) and the control group (*P < 0.05, ***P < 0.001, ANOVA)Back to article page