┌───────────────────── Escherichia coli E110019 (1)  
┤         ┌─ Escherichia coli K12 (90)  
└────────┬┴─ Escherichia coli MS 198-1   
         └─────────────────────────────┬────────────────────────────── Escherichia coli 536 (5)  
                                       └─ Escherichia coli 042 (32)  
  

  
Oligopeptide transport system permease protein OppC (TC 3.A.1.5.1)
 (4)
  
putative peptide transport system integral membrane protein
 (1)