┬──────────────────────────────────────────────────────────────────── Escherichia coli 2362-75 (30)  
└───────────────────────────────────┬───── Escherichia coli (7-233/233) OP50   
                                    └───────────────────────────┬───── Escherichia coli (1-238/241) 042 (40)  
                                                                └───── Escherichia coli K12 (52)  
  

  
Phosphate transport system regulatory protein PhoU
 (4)