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Effects of compounds 4c on the tube formation of HUVECs in vitro; (A) Images for the tube-forming inhibitory activities for 4c (0, 2.5, 5, 10 µM) in HUVECs; (C) Statistical analysis for the tube-forming capability. *p < 0.05, **p < 0.01,vs. control; ***p < 0.001 vs. control.
