Fig. 6. (  Left ) Propidium iodide fluorescence on CA1 hippocampal areas (×20 magnification). (  Right ) Propidium iodide fluorescence in physiologic (normal cerebrospinal fluid superfusion during all the procedure) or ischemia (3 h normal cerebrospinal fluid superfusion, 30 min oxygen- and glucose-free cerebrospinal fluid superfusion, and 1 h normal cerebrospinal fluid superfusion) experiments in presence or absence of dexmedetomidine preconditioning. *  P < 0.001.