this report concerns the effects of tryptophan , 5-htp or dopa on concentrations of 5-ht , da , norepinephrine , and their metabolites in p-chlorophenylalanine- , 5,7-dihydroxytryptamine ( 5,7-dht ) - or non-treated rat brain .
C0041249
tryptophan
C0000578
5-htp