Figure 4. NAP1L5 induces cell cycle S phase cell reduction and promotes apoptosis in vitro. (A) The effect of NAP1L5 downregulation on the cell cycle distribution of HepG2 and MHCC97H cells. (B) The effect of NAP1L5 overexpression on the cell cycle distribution of HepG2 and MHCC97H cells. (C) The effect of the downregulation of NAP1L5 on the apoptosis of HepG2 and MHCC97H cells. (D) The effect of NAP1L5 overexpression on HepG2 and MHCC97H cell apoptosis. *p < 0.05; **p < 0.01; ***p < 0.001.