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Distribution of the tryptophan hydroxylase (TPH) family in the selected vertebrate genomes.
| Class | Species Number | tph1 (tph1a) | tph1b | tph2 |
|---|---|---|---|---|
| Mammals | 11 | 11 | 0 | 11 |
| Birds | 18 | 18 | 0 | 18 |
| Reptiles | 9 | 9 | 0 | 9 |
| Amphibians | 3 | 4 | 0 | 4 |
| Actinopterygii | 29 | 37 | 26 | 37 |
| Total | 70 | 79 | 26 | 79 |
