┌─ Escherichia coli E2348/69   
    ┌──────────────────────────────────────────┴─ Escherichia coli K12 (128)  
┌───┴──────────────────────────────────────────────────────────────── Escherichia coli (3-90/99) K12 (132)  
┤                                         ┌─ Escherichia coli MS 145-7   
└───────────────────────────────┬─────────┴─ Escherichia coli MS 182-1   
                                └───────────┬─────── Escherichia coli K12 (130)  
                                            └─────────────────────┬─ Escherichia coli (1-87/90) 042 (1)  
                                                                  └┬─ Escherichia coli (1-87/90) K12 (128)  
                                                                   └─ Escherichia coli (1-87/90) IAI39 (1)  
  

  
DNA-binding protein HU-alpha
 (3)
  
DNA-binding protein HU-beta
 (3)
  
Integration host factor beta subunit
 (2)
  
Integration host factor alpha subunit
 (1)