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In situ gelling of chitosan based hydrogels. (A) Lack of gelation prior to UV induced photocrosslinking of chitosan precursor and (B) gelation occurs after exposure to UV radiation for 3 min. (C) Role of photocrosslinker in gelation, top shows gel formation due to photocrosslinker and bottom shows no gelation in the absence of photocrosslinker postexposure to UV radiation, after 3 min.
