the effects of imidazole-4-acetic acid ( ima , 100 -- 400 mg/kg ) on indole amine metabolism were studied by measurement of the cerebral hemisphere and brain stem contents of tryptophan , 5-hydroxytryptophan ( 5-htp ) , 5-hydroxytryptamine ( 5-ht ) , and 5-hydroxyindoleacetic acid ( 5-hiaa ) .
C0041249
tryptophan
C0000578
5-htp