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3D porous hydrogel constructs with different layer numbers. (A-C) Macroscopical and microscopical images of the constructs with 3, 5, and 10 layers. (D) SEM images of the constructs with 5 layers after freeze-drying. (E-G) The 3D confocal profiles of the constructs. (H) Quantification of the thickness of the constructs.
