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We previously demonstrated that tryptophan hydroxylase (TPH), the rate-limiting enzyme of serotonin (5-HT) synthesis, was commonly present in the brains of some insects. The current study was aimed at determining the number of serotonergic neurons in the brain and suboesophageal ganglion of adult Drosophila melanogaster and to investigate further the differences in immunoreactivity between 5-HT and...
Immediately following the discovery of tryptophan hydroxylase in Drosophila, we demonstrated the presence of tryptophan hydroxylase in the brain of the beetle Harmonia axyridis (Coleoptera: Coccinellidae). However, whether tryptophan hydroxylase is present in the brains of other insects is still a matter of discussion. In the current study, sheep anti-tryptophan hydroxylase polyclonal antibody has...
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