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Novel photocrosslinked hydrogels combined with human urine-derived stem cell exosomes have substantial merits in osteogenic repair. (A) Procedures for preparation of composite hydrogels. (B) Novel photocrosslinked hydrogels with instantaneous in situ seamless adhesion adapted to various bone defect morphologies and retaining human urine-derived stem cell exosome function to initiate osteogenesis and angiogenesis for cranial bone regeneration in rats.
