┌───── Escherichia coli K12 (96)  
┌───────────────────────────────────────────────────────────┴─ Escherichia coli ATCC 8739   
┤                                                    ┌───── Escherichia coli (32-88/88) CFT073 (13)  
└──────────────────────────────────────────────────┬─┴─ Escherichia coli H299   
                                                   └───────────┬───── Escherichia coli (2-58/58) K12 (30)  
                                                               └─ Escherichia coli (2-58/58) E110019 (2)  
  

  
GnsB protein
 (4)
  
GnsA protein
 (2)