Fate of tritiated noradrenaline at the sympathetic nerve endings.

Using electron microscopy and tritiated norepinephrine, the authors discovered the area in the nerve endings in which the catecholamines were concentrated, and also observed enhanced radioactive catecholamine release following nerve stimulation specifically from sympathetic nerve endings.

Order of authorship in the original publication: Hertting, Axelrod.

(Thanks to Juan Weiss for this reference and its interpretation.)