Immunoreactive positive fibers with brown linear structures were observed on the anterior cerebral artery(ACA), middle cerebral artery(MCA) and posterior cerebral artery(PCA) in control rats.

• 正常组大鼠脑底血管大脑前动脉、大脑中动脉和大脑后动脉均可见棕褐色的 NPY能免疫反应阳性纤维 ,呈细线状 ,攀附于血管壁上。