Differential effect of FC101 on cell cycle distribution and apoptosis induction in HaCaT and SRB12-p9 cells. Cells were plated and treated as in described in Figure 3 and harvested for FACS analysis. Y-axis indicates cell number, X-axis indicates intensity of propidium iodide staining. The numbers in boxes indicate the percentages of live cells in each phase of the cell cycle. The percent of total particles counted that are sub-G1 in size are also indicated.