Fig. 4

HepG2 cell morphology after 48 h of culture using H&E staining (a) control (b) cultured on graphene oxide nanofilm, c cultured with the addition of chicken embryo liver extract, d cultured on graphene oxide nanofilm with the addition of chicken embryo liver extract. Light optical microscopy. The greater red frames (scale bar: 50 μm) indicate magnified parts of the main pictures (marked by smaller red frames, scale bar: 200 μm)