Morphological features. (A) Morphological feature under inverted microscope. The magnification is 400×. HepG2.2.15 cell line grew in multilayer and adherence. HepG2 cell line grew in monolayer and adherence. (B) Ultrastructural characteristic. Bar, 500 nm. (i) HepG2.2.15 cell (×3000). (ii) Virus inclusion in HepG2.2.15 cell (×15 k). Bottom left is further magnification (×30 k). (iii) HepG2 cell (×6000).