in order to investigate possible disturbances of the blood-brain transport mechanisms of monoamine precursors in manic-depressive illness and schizophrenia , we have measured the brain arterio-venous difference of dopa , or 5-htp , or tyrosine and tryptophan in 36 patients , during the infusion of either l-dopa or l-5-htp .
C0013023
dopa
C0023570
l-dopa