┬──────────────────────────────────────────────────────────────── Escherichia coli (1-45/418) APEC O1 (2)  
└───────────────────────────────────────────────────────────┬─ fig|1040638.4.peg.4699 O104:H4 str. LB226692   
                                                            └───┬──── Escherichia coli MS 116-1 (1)  
                                                                └─ Escherichia coli 1125A (10)  
  

  
Putrescine ABC transporter putrescine-binding protein PotF (TC 3.A.1.11.2)
 (3)
  
 Others 
(1)