Effect of melilotus extract on the expression of CB2 mRNA in mononuclear cells from peripheral blood, NF-κβ mRNA and IκB mRNA from lung tissue. A): Representative RT-PCR showing the level of CB2 mRNA, NF-κβ mRNA and Iκβ mRNA expression in rats at 24 h after tubed administration of melilotus extract. 1: mark; 2: normal control group; 3: sham operation group; 4: control group; 5: treatment group. B): Statistical summary of the densitometric analysis of CB2 mRNA, NF-κβ mRNA and Iκβ mRNA expression in rats. Each value represents the mean ± SD as determined from three independent experiments. *P < 0.05, **P < 0.01, vs the normal control group and sham operation group; #P < 0.05, ##P < 0.01, vs the control group.