┌─ Escherichia coli (14-232/239) 042 (51)  
                                    ┌┴─ Escherichia coli (14-232/239) K12 (80)  
                                 ┌──┴─ Escherichia coli (14-232/239) MS 69-1   
┌────────────────────────────────┴─────────────────────────────────── Escherichia coli (13-232/235) 53638 (1)  
┤                                   ┌─ Escherichia coli (1-253/254) CFT073 (1)  
└───────────────────────────────────┤ ┌─ Escherichia coli (3-255/255) 042 (59)  
                                    └┬┴─ Escherichia coli M718   
                                     └┬─ Escherichia coli (3-255/255) E2348/69   
                                      └┬─ Escherichia coli (1-253/254) MS 21-1   
                                       └┬─ Escherichia coli K12 (64)  
                                        └─ Escherichia coli MS 116-1   
  

  
Uridine phosphorylase (EC 2.4.2.3)
 (7)
  
Purine nucleoside phosphorylase (EC 2.4.2.1)
 (4)