The catecholaminergic innervation of thyrotropin-releasing hormone (TRH) neurons was examined by use of a combined method of 5-hydroxydopamine (5-OHDA) uptake or autoradiography after intraventricular injection of3H-noradrenaline (3H-NA) and immunocytochemistry for TRH in the same tissue sections at the electron-microscopic level.
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