Figure 3: Caspase-3 positive cells in brain slices of five groups at 24 h and 72 h. Data are presented as . , versus sham-operated group. There were significant differences in IR, P1, P2, P3 groups than that in sham-operated group; , versus IR group. There were significant differences in P1, P2, P3 groups than that in IR group; P1 group. There were significant apoptosis in P2, P3 groups. But, in 72 h, there was no obvious difference between P2 and P3 group.