| C6 zinc cluster factors | 1 |
| C2H2 zinc finger factors | 2 |
| Basic leucine zipper factors (bZIP) | 3 |
| Basic helix-loop-helix factors (bHLH) | 4 |
| Other C4 zinc finger-type factors | 5 |
| Tryptophan cluster factors | 6 |
| Homeo domain factors | 7 |
| Fork head/winged helix factors | 8 |
| APSES-type DNA-binding domain | 9 |
| Heat shock factors | 10 |
| High-mobility group (HMG) domain factors | 11 |
| Heteromeric CCAAT-binding factors | 12 |
| MADS box factors | 13 |
| A.T hook factors | 14 |
| Copper-fist DNA-binding domain | 15 |
| NDT80 domain factors | 16 |
| RING-type zinc finger | 17 |
| TATA-binding proteins | 18 |
| TEA domain factors | 19 |
| Unknown | 20 |
| * | Non-validated |
