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Effect of an ethanol extract of Ulmus davidiana var. japonica (UD) on endothelial cell viability. (A) Representative endothelial cell morphology 24 h after exposure to UD (0.01~1 mg/ml). (B) Cell viability was assessed with propidium iodide staining. Each bar shows the mean±S.E. (n=4). C: untreated control, *p<0.05 versus control.
