- Classes: Low resolution protein structures
 - Folds: Electron transport chains
 - Superfamilies: Electron transport chains
 - Families: Electron transport chains
 
Protein Domains:
- Cytochrome f-plastocyanin complex
- [AB]
 - [AB]
 
 - Ferredoxin-cytochrome complex
- ---
 
 - [Fe]-hydrogenase/cytochrome c553 complex
- [ABC]
 
 
	* [ ] : Polypeptide  - [AB] : Protein, [ab] : Small peptide
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
* ( ) : Nucleic acid - (AB) : DNA, (ab) : RNA
