Figure 4

Hoechst 33342 stanning for the apoptotic cells infected with the various viruses. Tumor cells or normal cells were infected with AD55, AD55-Apoptin and ONYX-015 at the MOI of 5, respectively. After 48 hours, cells were incubated with Hoechst 33342 for 30 min and observed under a fluorescence microscope (arrows indicated apoptotic cells). (Original magnification: ×200).