| Unkown |
| High-mobility group (HMG) domain factors |
| C2H2 zinc finger factors |
| MADS box factors |
| C6 zinc cluster factors |
| Basic leucine zipper factors (bZIP) |
| Other C4 zinc finger-type factors |
| Tryptophan cluster factors |
| Basic helix-loop-helix factors (bHLH) |
| Copper-fist DNA-binding domain |
| Homeo domain factors |
| Fork head / winged helix factors |
| Heteromeric CCAAT-binding factors |
| Heat shock factors |
| APSES-type DNA-binding domain |
| RING-type zinc finger |
| NDT80 domain factors |
| TATA-binding proteins |
| A.T hook factors |
| TEA domain factors |
| * | Non-validated |