Figure 1.

Flow cytometric analysis of dead cells in Daudi and Ramos cells. Annexin V/PI in vivo detection with flow cytometry of early apoptotic (Annexin V^pos/PI^neg), late apoptotic (Annexin V^pos/PI^pos) and necrotic cells (Annexin V^neg/PI^pos) at 24 h in (A) Daudi cells and (B) Ramos cells left unirradiated or (C) exposed to different IR doses, as indicated. Bar graph represents the means ± SEM of the cell percentage derived from 4 independent experiments (^*p<0.05, ^**p<0.01 vs. unirradiated control).