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(a) The GelMA-HAMA hydrogel is cured in 10s under 365 nm UV light. (b) Various kinds of shapes of the NdFeB-hybrid GelMA-HAMA hydrogel. (c) The wings of the dragonfly-like-hydrogel can flap when exposed to a magnetic field. (d) The SEM image of the pure hydrogel and the NdFeB-hybrid hydrogel. Scale bar, 50 μm.
