Fig. 4

Viability of HUVECs under CPO conditions. (A) Line graph showing the cell viability in the 48 h CCK-8 assay. (B) Line graph showing the relative multiplication of HUVEC viability in the HypCPO group compared with that in the Hyp group. The error bars represent the ± SDs. *: P < 0.05, **: P < 0.01. HUVEC: human umbilical vein endothelial cell; Nor: normoxia; Hyp: hypoxia; CPO: copper overload; SD: standard deviation