┌─ Escherichia coli (1-91/94) K12 (128)  
   ┌──────────────────────────────────────────────────────┴─ Escherichia coli (1-91/94) E2348/69   
┌──┴─────────────────────────────────────────────────────── Escherichia coli (12-91/99) K12 (132)  
┤                                          ┌─ Escherichia coli MS 182-1   
└──────────────────────────────┬───────────┴── Escherichia coli MS 145-7   
                               └───────────┬─────── Escherichia coli K12 (130)  
                                           └───────────────────────┬─ Escherichia coli (1-89/90) 042 (1)  
                                                                   └┬─ Escherichia coli (1-89/90) K12 (128)  
                                                                    └─ Escherichia coli (1-89/90) 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)