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Figure 9. Recovery results of EV delivery hydrogels. (A) Accelerated healing of alveolar bone by dental pulp stem cell-EV chitosan-β-sodium glycerophosphate hydrogels injected within the cavity of periodontitis; (B) reduction of necrotic fibers and inflammatory cells (staining), and improved angiogenesis (live imaging) by MSC-EV-encapsulated amine-aldehyde chitosan hydrogel in hindlimb. Figure 9A adapted with permission^[47], Copyright 2020, the authors, published by KeAi Publishing; 9B adapted with permission^[126], Copyright 2018, American Chemical Society. EV: Extracellular vesicle; MSC: mesenchymal stem cell.