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(a–h) Self-healing process of N-succinyl chitosan and chondroitin sulfate multiple aldehyde based injectable hydrogel. SEM images of healed hydrogels (i): surface, ×70, scale bar = 200 μm; (j): internal, ×500, scale bar = 50 μm. Reprinted with permission from Injectable and Self-Healing Carbohydrate-Based Hydrogel for Cell Encapsulation [57]. Copyright © (2015), American Chemical Society.
