┌──────────────────── Escherichia coli IAI39 (1)  
┤     ┌── Escherichia coli 55989 (36)  
└─────┤   ┌──────────────────────────── fig|1040638.4.peg.2550 O104:H4 str. LB226692  [2] 
      │ ┌─┴────────────────────────── Escherichia coli (41-482/482) 101-1   
      └─┤ ┌── Escherichia coli (64-505/505) K12 (21)  
        └─┤                             ┌── Escherichia coli (64-505/505) O157:H7 (9)  
          │                           ┌─┴── Escherichia coli 1212A (5)  
          └─┬─────────────────────────┴── Escherichia coli (64-505/505) O157:H7 EDL933   
            └─┬──────────────────────────── Escherichia coli (64-505/505) E110019  [2] 
              └─┬────────────────────────── Escherichia coli (84-525/525) E2348/69 (1)  
                └─────────────────────────┬── Escherichia coli (84-525/525) CFT073 (1)  
                                          └─────────────────────────┬── Escherichia coli M605   
                                                                    └── Escherichia coli (41-482/482) O83:H1 str. NRG 857C   
  

  
Putative permease
 (7)
  
Xanthine permease
 (5)
  
 Others 
(1)