Figure 5
Apoptosis of HDF cells induced by GO: a normal HDF cells, showing normal morphological cells, b morphological changes of HDF cells cultured with 100 μg/mL GO for 1 day, cells appear inner vacuole and apoptotic bodies showing apoptotic characteristics, c morphology of HDF cells cultured with 20 μg/mL GO for 3 days, showing cell have unclear boundary, membrane vesicles and fragmentation, the arrow showing apoptotic cells formed nodular structure encapsulating GO, d morphology of HDF cells cultured with 5 μg/mL GO for 5 days, showing normal cell morphology.