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(A) Wound closure after different treatments visually presenting that chitin nanofiber-based hydrogel encapsulating bone marrow mesenchymal cells provide the best outcomes [92]. (B) Silk fibroin with additives of ethylene glycol and triethylene glycol to release insulin over 4 days [87]. Reproduced with permissions: (A) is from John Wiley and Sons, 2017; (B) is from American Chemical Society, 2020.
