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a) The structure and different components of CEC-OAHA-MMP hydrogels connected through reversible imine bonds and dithiol MMP-sensitive cross-linker; b) combining hydrogel modules stained with gradient blue dye (i) together, at 37°C for 20 min (ii), the resulted a one-piece hydrogel was self-healed without boundaries between the different modules (iii-iv).73 Copyright 2017 Wiley-VCH.
