“ Metoprolol (350 mg/kg/day for …, orally) significantly reduced the 5-hydroxytryptophan (5-HTP) accumulation when measured 30 min after inhibition of L-amino acid decarboxylase by NSD 1015 (100 mg/… IP) in the limbic forebrain, the corpus striatum, the cerebral cortex, the brain stem, and in the cerebellum.”