levels of tryptophan were significantly reduced in the cortex , hypothalamus , striatum , hippocampus , mesencephalon , diencephalon , pons-oblongata , and cerebellum , whereas serotonin concentrations were lowered in the diencephalon , pons-medulla , and cerebellum in jejunoileal rats compared with control rats .
C0020663
hypothalamus
C0012144
diencephalon