| Color | TF Class | Number |
|---|---|---|
| Homeo domain factors | 1 | |
| Fork head/winged helix factors | 2 | |
| Basic helix-loop-helix factors (bHLH) | 3 | |
| C2H2 zinc finger factors | 4 | |
| Tryptophan cluster factors | 5 | |
| Basic leucine zipper factors (bZIP) | 6 | |
| T-Box factors | 7 | |
| High-mobility group (HMG) domain factors | 8 | |
| Other C4 zinc finger-type factors | 9 | |
| Rel homology region (RHR) factors | 10 | |
| Heat shock factors | 11 |