- Classes: Alpha and beta proteins (a+b)
 - Folds: Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain
 - Superfamilies: Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain
 - Families: Succinate dehydrogenase/fumarate reductase flavoprotein, catalytic domain
 
Protein Domains:
- Adenylylsulfate reductase A subunit
- [A2B2]
 
 - Flavocytochrome c3 (respiratory fumarate reductase)
- [A], [A2]
 - [A]
 
 - L-aspartate oxidase
- [A2], [A]
 
 - Succinate dehydogenase
- [AB]
 
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
