| A | Formyl_trans_N | e4hu8A1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| A | Cobalamin_bind | e4hu8A2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| B | POTRA | e4hu8B2 | A: a/b three-layered sandwiches | X: CCHHC domain | H: CCHHC domain | T: CCHHC domain | F: POTRA | ECOD (v294.1) |
| B | Formyl_trans_N | e4hu8B3 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| C | Formyl_trans_N | e4hu8C1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| C | Cobalamin_bind | e4hu8C2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| D | Formyl_trans_N | e4hu8D1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| D | Cobalamin_bind | e4hu8D2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| E | Formyl_trans_N | e4hu8E1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| E | Cobalamin_bind | e4hu8E2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| F | Formyl_trans_N | e4hu8F1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| F | Cobalamin_bind | e4hu8F2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| G | Formyl_trans_N | e4hu8G1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| G | Cobalamin_bind | e4hu8G2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |
| H | Formyl_trans_N | e4hu8H1 | A: a/b three-layered sandwiches | X: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | H: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | T: Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | F: Formyl_trans_N | ECOD (v294.1) |
| H | Cobalamin_bind | e4hu8H2 | A: a/b three-layered sandwiches | X: RuvA-C | H: post-HMGL domain-like | T: post-HMGL domain-like | F: Cobalamin_bind | ECOD (v294.1) |