┌────────────────── Escherichia coli ETEC H10407   
                                         ┌┴────────────────── Escherichia coli MS 116-1   
                                        ┌┴─ Escherichia coli K12 (61)  
                                       ┌┴─ Escherichia coli (4-104/104) MS 21-1   
┬──────────────────────────────────────┴─ Escherichia coli 042 (41)  
└────────────────────────────────┬─ Escherichia coli APEC O1 (2)  
                                 └┬─ Escherichia coli (4-104/104) 83972 (4)  
                                  └────────┬─ Escherichia coli 2362-75 (16)  
                                           └────────────────────────── Escherichia coli CFT073   
  

  
Cytochrome O ubiquinol oxidase subunit IV (EC 1.10.3.-)
 (9)