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The results of the MTT assay for 3D rGO/PPY and 3D rGO/PPY/Sr scaffolds after co-culture with MC3T3-E1 cells at 24 h, 48 h, and 96 h, respectively. (## p < 0.05 3D rGO/PPY vs. control group, && p < 0.05 3D rGO/PPY/Sr vs. 3D rGO/PPY group.).
