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Cell viability/proliferation behavior on different scaffolds at 1, 3, 7, and 14 days after cell seeding. The significance levels were set at ** p < 0.01, and *** p < 0.001 compared with control (PCL), # p < 0.05, ## p < 0.01, and ### p < 0.001 compared among all graphene-loaded (G and N-G) scaffold.
