Effect of melilotus extract on the expression of CB2 in mononuclear cells in peripheral blood, NF-κβ and Iκβ in lung tissue by western blot. A): Representative western blots show the level of CB2, NF-κβ and Iκβ expression in rats at 24 h after tubed administration of melilotus extract. 1: normal control group; 2: sham operation group; 3: control group; 4: treatment group. B): Statistical summary of the densitometric analysis of CB2, NF-κβ and Iκβ expression in rats. Data represent the mean ± SD of 3 experiments. *P < 0.05, **P < 0.01, vs the sham operation group; ##P < 0.01, #P < 0.01, vs the control group.