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Color | TF Class | Number
--- | --- | ---
| C2H2 zinc finger factors | 1
| Homeo domain factors | 2
| Nuclear receptors with C4 zinc fingers | 3
| Basic helix-loop-helix factors (bHLH) | 4
| Basic leucine zipper factors (bZIP) | 5
| Fork head/winged helix factors | 6
| Other C4 zinc finger-type factors | 7
| T-Box factors | 8
| DM-type intertwined zinc finger factors | 9
| Paired box factors | 10
| High-mobility group (HMG) domain factors | 11
| SMAD/NF-1 DNA-binding domain factors | 12
| Tryptophan cluster factors | 13
| C2HC | 14
| CRC domain | 15
| Grainyhead domain factors | 16
| Heat shock factors | 17
| Heteromeric CCAAT-binding factors | 18
| MADS box factors | 19
| STAT domain factors | 20
| Unknown | 21
* | Unvalidated