simultaneous measurement of 5-hydroxytryptophan ( 5-htp ) , 5-hydroxytryptamine ( 5-ht ) , and 5-hydroxyindoleacetic acid ( 5-hiaa ) levels in the three brain areas revealed that mfmd caused large increases in pineal 5-htp concentrations and substantial decreases in pineal 5-ht and 5-hiaa both in the light and dark phases ;
C0006104
brain
C0086045
concentrations