2.5.1.16 spermidine synthase raphe nucleus mesencephalic raphe nucelus, highest levels of expression in nucleus accumbens, taenia tecta, cerebellar cortex, cerebral cortical layer I, hippocampus, hypothalamus, mesencephalic raphe nuclei, central and lateral amygdala, and the circumventricular organs 688510 2.6.1.42 branched-chain-amino-acid transaminase raphe nucleus - 673846 4.1.1.28 aromatic-L-amino-acid decarboxylase raphe nucleus - 691888 4.1.1.28 aromatic-L-amino-acid decarboxylase raphe nucleus of 36-h post-fertilization zebrafish embryos 728621