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The angiogenic properties of BPPNs in vitro. A-B. Western blots of VEGF and HIF-1α by HUVECs incubated in different preparations for 24 h. C. Representative images of HUVEC migration after treating for 0, 6, 12 h, scale bar: 500 μm. D. Quantify the migration of HUVEC. E. Representative images of HUVEC tubular formation after treating for 4 h, scale bar: 200 μm. F. Quantify the tubular formation of HUVEC. n = 3, *P < 0.05, **P < 0.01, ***P < 0.005, ****P < 0.001
