an account of the relationships between different neuronal systems , the possibility of simultaneously assaying serotonin ( 5ht ) dopamine ( da ) and noradrenaline ( na ) and their metabolites dihydroxy-phenylacetic acid ( dopac ) , homovanillic acid ( hva ) and 5-hydroxy-indolacetic acid ( 5hiaa ) in the same brain area is sometime important for understanding the drugs ' effects of mechanisms of action on monoaminergic systems ( ponzio et al. , 1981 ; holmes and rutledge , 1976 ) .
C0006104
brain
C0162340
understanding