- Classes: Alpha and beta proteins (a/b)
 - Folds: Fe-only hydrogenase
 - Superfamilies: Fe-only hydrogenase
 - Families: Fe-only hydrogenase
 
Protein Domains:
- Fe-only hydrogenase larger subunit, C-domain
- [AB]
 
 - Fe-only hydrogenase, catalytic domain
- [A]
 
 - automated matches
- [A]
 
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
