| Gene | Description | Domains |
|---|---|---|
| Spis25129_1 | hydroxymethylbilane synthase | Porphobil_deam |
| Spis_XP_022778485_1 | hydroxymethylbilane synthase | Porphobil_deam, Porphobil_deamC |
| Spis_XP_022790351_1 | hydroxymethylbilane synthase | Porphobil_deam, Porphobil_deamC |
| Spis_XP_022807713_1 | hydroxymethylbilane synthase | Porphobil_deam |