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Angiogenic activity of ECs cultured on the gradient coating. (a) Fluorescence images of NO of ECs after cultured on the coating surface for 24 h. (b) The quantitative results of the NO. (c) Fluorescence images of CD31 of ECs after cultured on the coating surface for 24 h. (d) The quantitative results of the CD31. n = 3, ∗p < 0.05, ∗∗p < 0.01, and ∗∗∗p < 0.001 using one-way ANOVA with a Tukey post hoc test.
