- Classes: Membrane and cell surface proteins and peptides
 - Folds: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)
 - Superfamilies: a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase)
 
Families:
- 42
 - 10
 
* Number of SCOP families of each Family
