Figure 2: HAL-PDT-induced apoptosis of the COLO 205 and HCC2998 cells. (A) Fluorescence and corresponding phase-contrast images of the apoptotic COLO 205 and HCC2998 cells at 20 h after HAL-PDT. (B) Electron microscopic images of the apoptotic COLO 205 and HCC2998 cells at 20 h after HAL-PDT (Bars: 10 μm).