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Preparation of the rhCol III hydrogel. (A) Schematic diagram of the reaction of the rhCol III hydrogel preparation. (B) TGase crosslinked to the rhCol III hydrogel. (C) Rheological experiments of the rhCol III hydrogel. (D) SEM image of the rhCol III hydrogel. (E) Swelling rate of the rhCol III hydrogel. (F) Degradation rate of the rhCol III hydrogel. (G) Sustained release of EVs in the rhCol III hydrogel. (H) Effect of the rhCol III hydrogel extract on cell proliferation (n = 3).
