┌─ Escherichia coli K12 (79)  
                                     ┌┴─ Escherichia coli (1-238/239) O157:H7 EDL933   
                                    ┌┴─ Escherichia coli 042 (51)  
                                  ┌─┴─ Escherichia coli MS 69-1   
┌─────────────────────────────────┴────────────────────────────────── Escherichia coli (2-233/235) 53638 (1)  
┤                                    ┌─ Escherichia coli (19-248/254) CFT073 (1)  
└────────────────────────────────────┤ ┌─ Escherichia coli (19-248/253) M718   
                                     └┬┴─ Escherichia coli (21-250/255) 042 (59)  
                                      └┬─ Escherichia coli (19-248/254) MS 21-1   
                                       └┬─ Escherichia coli (19-248/253) K12 (64)  
                                        └┬─ Escherichia coli (10-250/255) E2348/69   
                                         └─ Escherichia coli (19-248/253) MS 116-1   
  

  
Uridine phosphorylase (EC 2.4.2.3)
 (7)
  
Purine nucleoside phosphorylase (EC 2.4.2.1)
 (5)