(A) HUVECs proliferation and morphology after 1 day of incubation with leachate the vascular grafts and control group obtained by fluorescence microscopy, indicating Cu-releasing vascular grafts stimulated proliferation of HUVECs (scale bar: 200 μm). (B) Vascular grafts' cytocompatibility evaluation. MTT assay measured EC viability after incubation for 1, 3, and 7 days with P:P:Bs vascular grafts and control graft. Data presented as mean ± SD, n = 3, all statistical significance shown in comparison to P:P graft, ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001.