the detection limits were 2 micrograms/ml 5-hydroxytryptophan , 1.75 micrograms/ml 5-hydroxyindolyl-3-acetic acid , 1.5 micrograms/ml tryptophan , 0.8 micrograms/ml indolyl-3-acetic acid , 0.9 micrograms/ml indolyl-3-butyric acid , 1.75 micrograms/ml serotonin , and 1.25 micrograms/ml tryptamine .
C0000578
hydroxytryptophan
C0041249
tryptophan