| Homeo domain factors | 1 |
| C2H2 zinc finger factors | 2 |
| Fork head/winged helix factors | 3 |
| Basic leucine zipper factors (bZIP) | 4 |
| Basic helix-loop-helix factors (bHLH) | 5 |
| Tryptophan cluster factors | 6 |
| T-Box factors | 7 |
| High-mobility group (HMG) domain factors | 8 |
| Nuclear receptors with C4 zinc fingers | 9 |
| Paired box factors | 10 |
| MADS box factors | 11 |
| Other C4 zinc finger-type factors | 12 |
| Rel homology region (RHR) factors | 13 |
| ARID | 14 |
| Basic helix-span-helix factors (bHSH) | 15 |
| Heat shock factors | 16 |
| p53 domain factors | 17 |
| Unknown | 18 |
| * | Unvalidated |
