Cerebral infarct volume was determined by using the 2,3,5-triphenyltetrazolium chloride (TTC) staining method. The rats were anesthetized, the blood samples were obtained from the femoral artery, the brain was removed immediately and cut into five coronal slices averagely, and then the slices were immersed in 2% TTC for 45 min at 37°C in the dark and turned them every 15 min. The results were analyzed by measuring the normal (red) and infarct volume ratio of the brain tissue (white). The cerebral infarction volume ratio was calculated using the following formula: the infarcted volume of the brain/the total volume of the brain × 100%.
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