| Tryptophan cluster factors | 1 |
| AP2/EREBP | 2 |
| GCM domain factors | 3 |
| Basic leucine zipper factors (bZIP) | 4 |
| Other C4 zinc finger-type factors | 5 |
| Basic helix-loop-helix factors (bHLH) | 6 |
| C3H(C) | 7 |
| Homeo domain factors | 8 |
| TCP | 9 |
| B3 | 10 |
| MADS box factors | 11 |
| C2H2 zinc finger factors | 12 |
| Heat shock factors | 13 |
| CPP | 14 |
| EIL | 15 |
| HC3 zinc ribbon factors | 16 |
| A.T hook factors | 17 |
| Fork head/winged helix factors | 18 |
| BBR/BPC | 19 |
| C3H zinc finger factors | 20 |
| Basic helix-loop-helix domain factors (bHLH) | 21 |
| LEAFY | 22 |
| Other all-alpha-helical DNA-binding domains | 23 |
| RWP-RK | 24 |
| Unknown | 25 |
