Transcription factors (TFs) of Hydra vulgaris are usually classified into different families according to their conserved DBDs, which was based on the rule of AnimalTFDB 4.0 and self-build HMM profiles.
| TF_bZIP(33) | Runt(1) | RHD(4) | bHLH(45) | HMG(40) | |
| zf-C2H2(159) | Homeobox(58) | ETS(11) | MH1(6) | Fork_head(35) | |
| T-box(4) | SRF(4) | THAP(171) | zf-BED(94) | HTH(89) | |
| PAX(37) | RFX(20) | ZBTB(67) | zf-CCCH(29) | E2F(6) | |
| zf-C2HC(4) | ESR-like(16) | Miscellaneous(16) | NGFIB-like(15) | RXR-like(17) | |
| SF-like(14) | THR-like(12) | GCNF-like(13) | MYB(34) | MBD(11) | |
| ARID(21) | NF-YA(1) | GCFC(1) | COE(1) | AP-2(1) | |
| zf-GATA(11) | zf-LITAF-like(3) | IRF(9) | HSF(9) | CSL(3) | |
| zf-GAGA(1) | DM(6) | CSD(3) | P53(7) | TEA(4) | |
| Pou(5) | CP2(3) | STAT(1) | zf-NF-X1(2) | LRRFIP(1) | |
| Tub(3) | SAND(3) | CG-1(1) | zf-MIZ(3) | AF-4(2) | |
| PC4(1) | NCU-G1(1) | Nrf1(7) | CBF(5) |
