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Representative microscopic images showing the blood vessels immunostained by vWF in the explanted scaffolds after subcutaneous implantation for 2 (a–d) and 4 (e–h) weeks (n = 3): PCL (a and e); VEGF loaded PCL (b and f); VEGF loaded Hep-PCL/Gel-1 (c and g); VEGF loaded Hep-PCL/Gel-2 (d and h) (scale bars = 50μm). Quantitative analysis on the density of blood vessel (i). * P < 0.05, # P < 0.001.
