┌─ Escherichia coli 536 (6)  
                                              ┌──────────┴─────────── Escherichia coli TA206   
┬─────────────────────────────────────────────┴─ Escherichia coli 2362-75 (19)  
└──────────────────────────────────┬─ Escherichia coli 53638 (1)  
                                   └──────────┬─────────── Escherichia coli 042 (33)  
                                              └─ Escherichia coli K12 (65)  
  

  
Putative cytochrome oxidase subunit
 (6)