| D | Hfx_Cass5 | e3if4D1 | A: alpha arrays | X: Alpha helical domain of ribonucleotide reductases | H: Alpha helical domain of ribonucleotide reductases | T: Alpha helical domain of ribonucleotide reductases | F: Hfx_Cass5 | ECOD (v295.2) |
| C | DBD_HTH | e3if4C1 | A: alpha arrays | X: triple barrel | H: triple barrel | T: RNA polymerase I subunits A49/A34.5 dimerization domains | F: DBD_HTH | ECOD (v295.2) |
| B | Hfx_Cass5 | e3if4B1 | A: alpha arrays | X: Alpha helical domain of ribonucleotide reductases | H: Alpha helical domain of ribonucleotide reductases | T: Alpha helical domain of ribonucleotide reductases | F: Hfx_Cass5 | ECOD (v295.2) |
| A | DBD_HTH | e3if4A1 | A: alpha arrays | X: triple barrel | H: triple barrel | T: RNA polymerase I subunits A49/A34.5 dimerization domains | F: DBD_HTH | ECOD (v295.2) |