Figure 6.

Immunofluorescence staining: cell nuclei were stained with DAPI (a). Cell cytoplasm was stained with antivimentin (b). (c) was composited by (a) and (b). Cells were seeded at the density of 5 × 10⁴ cells mL⁻¹ and cultured for 2, 5, and 10 days (1, 2, and 3), respectively.