Fig. 2

Cell proliferation and morphology of macrophage. A The optical images of macrophages on different scaffolds from day 1 to day 14. B CCK-8 assay was performed to evaluate cell proliferation of macrophages. C Confocal microscopy images of macrophages cultured on different scaffolds from day 1 to day 14. D Representative SEM images of macrophages on the scaffold and in the pores (red arrow: pancake-like shape, yellow arrow: elongated shape). n = 3. *P < 0.05, **P < 0.01 and ***P < 0.001