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Schematic illustration of antimicrobial mechanism in: (a) 3D-printed biocompatible scaffolds based on calcium-deficient hydroxyapatite (CDHA) with gold nanoparticles. Reprinted with permission from Ref. [204]. Copyright 2019 Elsevier; (b) gelatin-based and Zn2+-incorporated composite hydrogel (Gel@Zn) for bacterial elimination to promote infected wound healing. Reprinted with permission from Ref. [292]. Copyright 2022 Elsevier.
