at the end of the experiment the rats were killed , and the concentrations of the brain catecholamines , norepinephrine ( ne ) and dopamine ( da ) , catecholamine metabolites , 3-methoxy-4-hydroxymandelic acid ( vma ) , homovanillic acid ( hva ) , and dihydroxyphenylacetic acid ( dopac ) , and the indoleamine serotonin ( 5-ht ) and its metabolite , 5-hydroxyindoleacetic acid ( 5-hiaa ) , were determined by high-pressure liquid chromatography in five brain regions .
C0007412
catecholamines
C0028351
norepinephrine