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Fig. 2. Chemical structures of the αCD–VC11(x,y) hydrogels (a), βCD–VC11(x,y) hydrogels (b), and γCD–VC11(x,y) hydrogels (c) as supramolecular host–guest hydrogels. The VC11(0.2,y) hydrogels (d), γCD(x) hydrogels (e), and pAAm hydrogels (f) are covalently cross-linked control hydrogels.