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Wound healing ability assessment. (a–c) Photographs of wounds on the 1st, 3rd, 6th, and 12th day after treatment with PBS, SA hydrogel, and SA@MC4 hydrogels; (d–f) histomorphological evaluation of wound regeneration after treatment with PBS, SA hydrogel and SA@MC4 hydrogels on the 6th day (blood vessels: yellow arrows; hair follicles: green arrows).
