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(A) Schematic of the type 3 hybrid MNs with a “cake-like” structure fabricated by two-step photopolymerization. (B) Morphology of the type 3 hybrid MNs with “cake-like” structure. (C) SEM image of the type 3 hybrid MNs tip part. Scale bar: 100 μm. (D) SEM image of the type 3 hybrid MNs base layer region. Scale bar: 5 μm.
