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SEM image of porous structure of the scaffold ((a) scale bar = 3 mm) and the gradual porous structure of cartilage phase ((b) scale bar = 300 μm), interface layer ((c) scale bar = 400 μm), and bone phase ((d) scale bar = 1 mm). Pore size distribution of cartilage phase (e), interface layer (f), and bone phase (g) under nanomeasure.
