Fig. 16From: Recent advance in bioactive hydrogels for repairing spinal cord injury: material design, biofunctional regulation, and applicationsNP-functionalized bioactive hydrogels for SCI repair: a CeNP-Gel hydrogel for repairing SCI. Reprinted from Ref. [181], Copyright 2021, Wiley–VCH. b PPy NP-embedded collagen-HAMA hybrid hydrogel for in vivo SCI repair. Reprinted from Ref. [188], Copyright 2021, American Chemical SocietyBack to article page