Apoptosis-shaped pyramidal cellswere initially detected in CAl region at 24 hours after ischemia by TIJNELstaining and reached maximal at 72 hours. Its time schedule was consistentwith DND.

• TUNEL染色发现再灌注后24h，CA1区锥体细胞出现凋亡，72h达高峰，其时程与DND接近。