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Fig. 3. Early apoptosis (EA, revealed by annexin V staining), late apoptosis (LA, revealed by staining with PI), and changes in mitochondrial membrane potential (low {Delta}{psi}) in the cell types studied at different time points. Cells were treated as described in the legend to Fig. 2 ; data represent four to six independent experiments. *, P < 0.05; **, P < 0.01.