Infarction area labeled for mitochondrial activity (triphenyltetrazolium chloride, TTC). ET-1-alone group N = 3, pGSN treatment group, N = 4. *, p-value < 0.05. Four TTC-staining slices from two animals, one for each group, at the area received most of blood from MCA. Off-white color areas show death tissues while red areas indicate vital tissues.