Transcription factors (TFs) of Hydra viridissima 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.
| Homeobox(102) | ZBTB(96) | THAP(132) | zf-C2H2(194) | Tub(4) |
| PAX(10) | E2F(8) | HMG(44) | HTH(98) | bHLH(54) |
| zf-LITAF-like(6) | zf-CCCH(30) | SRF(4) | Fork_head(30) | TF_bZIP(52) |
| MYB(44) | zf-GATA(6) | ESR-like(16) | Miscellaneous(14) | RXR-like(14) |
| GCNF-like(18) | ETS(18) | MBD(4) | LRRFIP(2) | zf-NF-X1(4) |
| STAT(2) | zf-BED(120) | ARID(14) | T-box(10) | Pou(6) |
| IRF(10) | Runt(2) | AP-2(2) | MH1(12) | CP2(4) |
| P53(6) | GCFC(4) | COE(2) | DM(8) | CSD(10) |
| NGFIB-like(12) | SF-like(14) | THR-like(10) | HSF(10) | TSC22(2) |
| RFX(10) | CG-1(4) | zf-MIZ(4) | PC4(6) | RHD(4) |
| TEA(4) | CBF(2) | NCU-G1(2) | Nrf1(4) | CUT(2) |
| SAND(2) |
