Fig. 5

a Cell viability of KB cells was measured by MTT assay. Values represent mean ± SD (n = 3). b Cell viability of HaCaT. c Cell cycle phases of KB cells were analyzed using flow cytometer. d Cell cycle phases of HaCaT cells. A significant decrease compared with the control is denoted by “***” (P < 0.001) and a significant decrease compared with the “without 3-MA group” is denoted by “***#” (P < 0.001)