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Effects of Nar on the ROS levels (a, b), Ca2+ levels (c, d) and cell apoptosis (e, f) caused by LPS in HUVECs. I: Control; II: Model; III: Nar (0.2 μg/mL); IV: Nar (0.4 μg/mL); V: Nar (0.6 μg/mL). *p < 0.05 and **p < 0.01, compared with model group
