in the first demonstration of the regional distribution of a neurotransmitter in the brain of conscious normal man , we show here that l-3,4-dihydroxyphenylalanine ( l-dopa ) labelled in the 6-position with the positron-emitting radionuclide fluorine-18 , localizes specifically in the dopaminergic pathways of the human brain where its turnover could be measured atraumatically by positron emission tomography .
C0006104
brain
C0234421
conscious