| C2H2 zinc finger factors | 1 |
| Homeo domain factors | 2 |
| Basic helix-loop-helix factors (bHLH) | 3 |
| Basic leucine zipper factors (bZIP) | 4 |
| Nuclear receptors with C4 zinc fingers | 5 |
| Tryptophan cluster factors | 6 |
| Fork head/winged helix factors | 7 |
| High-mobility group (HMG) domain factors | 8 |
| Rel homology region (RHR) factors | 9 |
| T-Box factors | 10 |
| SMAD/NF-1 DNA-binding domain factors | 11 |
| Basic helix-span-helix factors (bHSH) | 12 |
| Paired box factors | 13 |
| Other C4 zinc finger-type factors | 14 |
| STAT domain factors | 15 |
| DM-type intertwined zinc finger factors | 16 |
| MADS box factors | 17 |
| ARID | 18 |
| Grainyhead domain factors | 19 |
| Heat shock factors | 20 |
| TEA domain factors | 21 |
| Heteromeric CCAAT-binding factors | 22 |
| Runt domain factors | 23 |
| SAND domain factors | 24 |
| p53 domain factors | 25 |
| C2CH THAP-type zinc finger factors | 26 |
| C2HC | 27 |
| GCM domain factors | 28 |
| TATA-binding proteins | 29 |
| CRC domain | 30 |
| Helix-Turn-Helix | 31 |
| Uncharacterized | 32 |
| Unknown | 33 |
