Fig. 15From: Recent advance in bioactive hydrogels for repairing spinal cord injury: material design, biofunctional regulation, and applicationsPolymer hydrogels for SCI repair: a 3D bioprinted conductive composite hydrogel for SCI repair. Reprinted from Ref. [169], Copyright 2023, Elsevier. b PLL hydrogel and its potential application in SCI repair. Reprinted from Ref. [174], Copyright 2023, ElsevierBack to article page