┬────────────── Escherichia coli MS 175-1   
└────────────┬─────────────────────────────────────────────────────── Escherichia coli B354   
             └┬─ Escherichia coli K12 (125)  
              └┬─ Escherichia coli E110019 (3)  
               └─ Escherichia coli (1-68/69) MS 115-1   
  

  
Cytochrome c-type biogenesis protein CcmD, interacts with CcmCE
 (5)