| E | Cytochrome_CBB3 | e3n2kE1 | A: a/b three-layered sandwiches | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: Cytochrome_CBB3 | ECOD (v294.1) |
| D | | e3n2kD3 | A: a/b three-layered sandwiches | X: DEATH domain | H: Ten stranded beta/alpha barrel | T: Ten stranded beta/alpha barrel | F: | ECOD (v294.1) |
| B | Cytochrome_CBB3 | e3n2kB1 | A: a/b three-layered sandwiches | X: Lipocalins/Streptavidin | H: Zn-dependent exopeptidases | T: Zn-dependent exopeptidases | F: Cytochrome_CBB3 | ECOD (v294.1) |
| C | | e3n2kC3 | A: a/b three-layered sandwiches | X: DEATH domain | H: Ten stranded beta/alpha barrel | T: Ten stranded beta/alpha barrel | F: | ECOD (v294.1) |
| A | | e3n2kA3 | A: a/b three-layered sandwiches | X: DEATH domain | H: Ten stranded beta/alpha barrel | T: Ten stranded beta/alpha barrel | F: | ECOD (v294.1) |