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(A) HBMECs were treated with quercetin (0, 0.1, 0.5, 1, 2, 5, 10 μmol/L) for 24 h, viability was measured using CCK-8 method (B) HBMECs were treated with quercetin (0, 0.1, 0.5, 1, 2, 5, 10 μmol/L) and H/R treatment, viability was measured using CCK-8 method. ### p < 0.001 compared to control group; ** p < 0.01, *** p < 0.001 compared to H/R group. H/R: hypoxia and reoxygenation, n = 3.
