Fig. 7. Fas/FasL apoptotic system was involved in TV-mediated apoptosis. A549 cells were incubated with 0, 5, 10 and 15 μM of TV for 6, 12, 24 and 48 h. (A) The level of Fas receptor in A549cells, (B) the amount of mFasL in A549 cells, (C) the amount of sFasL in A549 cells. Each value is the mean ± S.D .of three inde-pendent experiments. Statistical significance: *p<0.01 vs. control.