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Evaluation of in vivo angiogenesis in the in-situ bioprinted constructs on day 7. (A, C) IHC staining of CD31 and the quantitative results. Scale bar: 50 μm. (B, D) Immunofluorescent staining of CD31 and α-SMA for mature blood vessels. Scale bar: 50 μm. Data are expressed as the mean ± SEM; n = 3; ∗P < 0.05; ∗∗∗P < 0.001; ∗∗∗∗P < 0.0001.
