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Immunohistochemistry analysis of VEGF expression in four skin transplantation groups. (A) On day 7, more VEGF was expressed in the three adipose-derived stem cell (ADSC) experimental groups than in the control group. (B) On day 21, in the experimental groups, there was still more VEGF expressed than in the control group (× 200). (C) Quantification of the expression of VEGF in the four groups (**: P < 0.0001).
