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a) Pictures of histological analysis of wound regeneration on day 3, 7 and 14 of control group (Tegaderm™ film dressing), OSD/CMC hydrogel group, OSD/CMC/Fe/PA3 hydrogel group and OSD/CMC/Fe/PA3 hydrogel + NIR group; b) Statistical graph of angiogenesis on day 7; c) Statistical graph of hair follicles in different groups on 14th day, *P < 0.05, **P < 0.01, ***P < 0.001.
