┌─────────────────────────────────────────────── Escherichia coli IAI39 (2)  
┤                                       ┌── Escherichia coli K12 (98)  
└─────────────────────────────────────┬─┴──────────────────────────── Escherichia coli ED1a (1)  
                                      └─┬── Escherichia coli MS 78-1   
                                        └──────────────────────────┬── Escherichia coli (1-426/427) O157:H7 EDL933 (1)  
                                                                   └── Escherichia coli (1-426/427) 1044A (25)  
  

  
Citrate synthase (si) (EC 2.3.3.1)
 (6)