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Effect of ATRA on wound vascularity. A, Representative images of histological sections of wounds in rat treated with PBS, untreated MSCs and ATRA‐treated MSCs are shown after 9 days. Arrows signify blood vessels. B, Comparison between angiogenic scores in groups after 9 days. Data are represented as mean±SEM. (n=3); *P<.05, **P<.01 vs control and # P<.05 vs untreated MSCs
