levels of tryptophan ( trp ) , 5-hydroxytryptophan ( 5-htp ) , 5-hydroxytryptamine ( 5-ht ) , and 5-hydroxyindoleacetic acid ( 5-hiaa ) in human lumbar and ventricular cerebrospinal fluid ( csf ) were measured by reversed phase liquid chromatography ( hplc ) with electrochemical detection .
C0041249
tryptophan
C0000578
5-htp