Figure 2. Nuclear condensation of apoptotic human retinoblastoma (Y79) cells was detected with 4,6-diamidino-2-phenylindole (DAPI) labeling. Gossypol-treated Y79 cells containing condensed nuclei were counted under a fluorescence microscope. Panel A shows the percentages of condensed-nucleus (apoptotic) cells. Data are represented as the mean±SEM n=14, and * p<0.05, compared to the control group. The remaining figures showing microimages show apoptotic (arrows) and normal cells in (B) control and in (C) 1 μM, (D) 10 μM, and (E) 20 μM gossypol treatments. Scale bar is 50 μm.