Fig. 5From: Antiangiogenic effects of oridoninEffect of oridonin on HUVEC tube formation. HUVECs were treated with various concentrations (25–400 μg/ml) of oridonin. a control group; b 25 μg/ml oridonin group; c 100 μg/ml oridonin group; d 400 μg/ml oridonin group; e tube formation rate comparison. The asterisks indicate statistically significant differences for oridonin groups compared with the control group (**P < 0.01)Back to article page