ColHA hydrogel prepared via HRP-catalyzed crosslinking of collagen and HA modified with phenol groups. Cells can be loaded into the hydrogel for 3D culture, and the hydrogel can be used for wound healing [555]. Reprinted from Materials Science and Engineering: C 101, H. Ying, J. Zhou, M. Wang, D. Su, Q. Ma, G. Lv, and J. Chen, In situ formed collagen-hyaluronic acid hydrogel as biomimetic dressing for promoting spontaneous wound healing, 487–498, copyright (2019), with permission from Elsevier.