'Contralateral tissue was used as control. bIncubation time, 15 min. CDetermined from the graphic plot. norephinephrine (28.5 nCi/ml, 10 ng/ml for 30 min) except the experimental tissue was incubated for 15 min with the inhibitor of the neuronal uptake prior to the addition of (-)-H3-norephinephrine. The extraneuronal radioactivity was cleared by washing the tissues for 5 min in two volumes of the Kreb's solution. The tissue was blotted and ...