┌─ Escherichia coli K12 (128)  
                                                                   ┌┴─ Escherichia coli IAI39 (1)  
                                               ┌───────────────────┴─ Escherichia coli 042 (1)  
                                     ┌─────────┴─────── Escherichia coli (6-89/90) K12 (130)  
   ┌─────────────────────────────────┴─────────┬─ Escherichia coli (1-89/90) MS 182-1   
┌──┤                                           └─ Escherichia coli (1-89/90) MS 145-7   
┤  └────────────────────────────────────────┬─ Escherichia coli (1-89/94) K12 (128)  
│                                           └─ Escherichia coli (1-89/94) E2348/69   
└──────────────────────────────────────────────────────┬─ Escherichia coli HS (1)  
                                                       └┬─ Escherichia coli 1827-70   
                                                        └┬─ Escherichia coli (1-98/99) O157:H7 EDL933   
                                                         └─ Escherichia coli K12 (128)  
  

  
Integration host factor alpha subunit
 (4)
  
DNA-binding protein HU-alpha
 (3)
  
DNA-binding protein HU-beta
 (3)
  
Integration host factor beta subunit
 (2)