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3D bioprinting of void-forming hydrogels. (A) Schematic diagram of the DLP-based bioprinting approach. (B) Fluorescence microscopy (i, scale bar: 30 μm) and SEM (ii, scale bar: 100 μm) images of 3D-printed hydrogels. (C) Compressive stress-strain curve of 3D-printed hydrogels. (D) Diffusion of the BSA from the hydrogels (scale bar: 200 μm).
