from coronal sections of brains frozen in situ , small ( ca . 2 mg ) amounts of tissue were sampled from neocortex , hippocampus , and thalamus of both cerebral hemispheres of four groups of rats exposed to 30 min cerebral ischemia followed by 0 , 30 , 60 , and 240 min of reperfusion , and from a control group subjected to the same operative procedures , except for the induction of ischemia .
C0006104
brains
C0007785
cerebral ischemia