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In vitro biocompatibility of HUVECs on EF and EF-sponge scaffolds. a Images of HUVECs cultured on EF and EF-sponge, characterized by HE staining, fluorescence staining and SEM; b Proliferation of HUVECs cultured on EF or EF-sponge for 1, 4 and 7d (**p < 0.01); c Western blotting and d semi-quantification of protein levels of VEGF and HIF-1α (**p < 0.01)
