| E | HTH_3 | e3hkcE1 | A: alpha bundles | X: HTH | H: HTH | T: tetra-helical, lambda repressor-like | F: HTH_3 | ECOD (develop294) |
| D | HTH_3 | e3hkcD1 | A: alpha bundles | X: HTH | H: HTH | T: tetra-helical, lambda repressor-like | F: HTH_3 | ECOD (develop294) |
| B | HTH_3 | e3hkcB1 | A: alpha bundles | X: HTH | H: HTH | T: tetra-helical, lambda repressor-like | F: HTH_3 | ECOD (develop294) |
| C | | e3hkcC3 | A: alpha bundles | X: DEATH domain | H: Ten stranded beta/alpha barrel | T: Ten stranded beta/alpha barrel | F: | ECOD (develop294) |
| A | | e3hkcA3 | A: alpha bundles | X: DEATH domain | H: Ten stranded beta/alpha barrel | T: Ten stranded beta/alpha barrel | F: | ECOD (develop294) |