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Alginate-based hydrogel’s completed recovery. (A) Benzaldehydes based hydrogels to form self-healable hydrogels. (B) Alginate based hydrogels crosslinked with calcium chloride (without self-healing property). (C) Gross appearance of alginate hydrogels and self healing hydrogel. (D) Self-healing hydrogel is able to be extruded by 26 gauge needle. Reproduced from An injectable, self-healing hydrogel to repair the central nervous system [113].
