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Representative graphic of gelatin-based drug delivery systems. Adapted with permission from Hu Y et al. [77]. ASC Nano. Copyright 2022, American Chemical Society; reprinted from Chemical Engineering Journal, 435, Li D et al. [84]. Osteoimmunomodulatory injectable Lithium-Heparin hydrogel with Microspheres/TGF-β1 delivery promotes M2 macrophage polarization and osteogenesis for guided bone regeneration, 134991, copyright (2022), with permission from Elsevier.
