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Surface morphology of the silk fibroin/soy protein isolate (SF/SPI)-based composite scaffolds ((A): SF; (B): SF/SPI; (C): SF/SPI/graphene oxide (GO); (D): SF/SPI/β-tricalcium phosphate (β-TCP); (E): SF/SPI/GO/β-TCP). Enlarged views of the pore structures are on the top right corner of each figures.
