Fig. 1. Effects of oxygen and glucose deprivation (OGD) on cell death labeled by propidium iodide (PI) fluorescence induced by different periods of times (10, 20, 30, 60, and 90 min) of OGD in the CA1 subfield of mouse organotypic slice cultures. Data (mean ± SD) are expressed as fluorescence intensity increase from control (control: 100%). Analysis of variance for PI fluorescence were F = 147, P < 0.0001. Post hoc  analysis used Bonferroni correction. *P < 0.05, ***P < 0.001 versus  control. NS = nonsignificant.