Fig. 1.

Schematics showing the mechanism of dynamic biointerface and 3D ECM mimics based on a reversible dougong-structured natural receptor–ligand recognition. (A) The Van–AA molecular recognition on bacterial cell wall in nature. (B) Schematic illustration of the dynamic biointerface based on the reversible Van–AA interaction. Reversible bioligand presentation and controllable cell behaviors could be readily realized through the Van–AA interaction. (C) Schematic illustration of the dynamic hydrogels with remoldable network structure and its application in tissue repair.