| B | Formyl_trans_N | e4lxtB1 | 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) |
| B | | e4lxtB2 | 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: | ECOD (v294.1) |
| A | preSET_CXC | e4lxtA1 | A: a/b three-layered sandwiches | X: Rossmann-like | H: Rossmann-related | T: Nucleotide-binding domain | F: preSET_CXC | ECOD (v294.1) |