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Schematic light-induced shape-memory transitions between the triangle-shaped, high-stiffness polyacrylamide-based hydrogel crosslinked by glucosamine–boronate ester bridges and trans-azobenzene stabilized duplex crosslinkers and the low-stiffness hydrogel crosslinked by the glucosamine–boronate esters only. Adapted from [435] Open Access, Copyright 2020, Royal Society of Chemistry.
