the activity of glutamic acid decarboxylase ( gad ) and choline acetyltransferase ( chat ) as presynaptic markers of gamma-aminobutyric acid ( gaba ) - and acetylcholine ( ach ) -containing neurons , and the binding of [ 3h ] muscimol and [ 3h ] quinuclidinyl benzilate ( [ 3h ] qnb ) as postsynaptic ones were measured in autopsied samples of the caudate nucleus , putamen , pallidum , substantia nigra and the cerebral cortex from l-dopa-treated patients with stage v ( terminally bedridden ) patients with parkinson 's disease ( pd ) .
C0023570
l-dopa
C0030567
parkinson 's disease