Table 1. Number of HECT genes in selected species.
| SPECIES | Taxonomic group | I | II | III | IV | V | VI | Others | Total |
| Chlamydomonas reinhardtii | Green algae | 1 | 1 | 1 | 3 | 1 | 1 | 1 | 9 |
| Ostreococcus tauri | Green algae | 1 | 1 | 1 | 0 | 1 | 0 | 2 | 6 |
| Micromonas pusilla | Green algae | 1 | 1 | 1 | 2 | 1 | 0 | 2 | 8 |
| Physcomitrella patens | Bryophytes | 2 | 3 | 1 | 1 | 3 | 2 | 0 | 12 |
| Selaginella moellendorffii | Lycophytes | 1 | 1 | 1 | 2 | 3 | 1 | 0 | 9 |
| Picea sitchensis | Gymnosperms | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 5 |
| Hordeum vulgare | Angiosperms, monocots | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 5 |
| Zea mays | Angiosperms, monocots | 4 | 1 | 1 | 0 | 2 | 1 | 0 | 9 |
| Sorghum bicolor | Angiosperms, monocots | 4 | 1 | 1 | 0 | 2 | 1 | 0 | 9 |
| Oryza sativa | Angiosperms, monocots | 3 | 1 | 1 | 1? | 2 | 1 | 0 | 8–9 |
| Solanum tuberosum | Angiosperms, dicots, asterids | 2 | 1 | 1 | 0 | 2 | 6 | 0 | 12 |
| Vitis vinifera | Angiosperms, dicots, rosids | 3 | 1 | 1 | 0 | 2 | 1 | 0 | 8 |
| Glycine max | Angiosperms, dicots, rosids | 6 | 1 | 3 | 0 | 2 | 2 | 0 | 14 |
| Populus trichocarpa | Angiosperms, dicots, rosids | 2 | 1 | 2 | 0 | 3 | 1 | 0 | 9 |
| Arabidopsis thaliana | Angiosperms, dicots, rosids | 2 | 1 | 1 | 0 | 2 | 1 | 0 | 7 |
I-VI refer to the six HECT subfamilies. The column marked as “Others” includes the few sequences shown in Figure 1 that cannot be included in any subfamily. The question mark indicates a gene that is most likely falsely attributed to Oryza sativa (see text).