Science. 1966 Jul 15;153(3733):308-10. doi: 10.1126/science.153.3733.308.
Tritiated norepinephrine was injected into the lateral ventricles of rats, and its localization in the hypothalamus was determined by light and electron-microscopic autoradiography. Eighty percent of the autoradiographic grains were located over nerve endings and unmyelinated axons. Large, dense synaptic vesicles were present in most of the endings and axons with activity. Grains were rarely seen over myelinated axons, glia, or blood vessels.
氚标记去甲肾上腺素被注入大鼠侧脑室，并用光镜和电镜放射自显影术确定其在下丘脑的定位。80%的放射自显影颗粒位于神经末梢和无髓轴突上。大多数有活性的神经末梢和轴突中都存在大而致密的突触小泡。颗粒很少出现在有髓轴突、神经胶质或血管上。
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