┌─ Escherichia coli B354 (7)  
                                           ┌┴──────────────────────── Escherichia coli (51-420/420) 042 (1)  
                                          ┌┴──────────── Escherichia coli M718   
                              ┌───────────┴──────────── Escherichia coli IAI39 (3)  
                  ┌───────────┴─ Escherichia coli MS 69-1   
      ┌───────────┴─ Escherichia coli H299   
┌─────┴┬─ Escherichia coli 101-1 (12)  
│      └┬──────────── Escherichia coli 1044A (25)  
│       └──────────── Escherichia coli E24377A (6)  
┤                              ┌─ Escherichia coli 2362-75 (24)  
│                  ┌───────────┴──────────── Escherichia coli 83972 (5)  
│      ┌───────────┴─ Escherichia coli IAI1 (2)  
└──────┤┌─ Escherichia coli K12 (21)  
       └┤┌──────────── Escherichia coli SE11   
        └┤ ┌──────────────────────── Escherichia coli MS 196-1   
         │┌┴──────────── Escherichia coli 53638 (2)  
         └┤            ┌─ Escherichia coli (26-395/395) B171 (1)  
          └┬───────────┴──────────── Escherichia coli (26-395/395) E22 (2)  
           └───────────┬─ Escherichia coli (26-395/395) B7A (2)  
                       └───────────┬─ Escherichia coli MS 124-1 (1)  
                                   └───────────┬──────────── Escherichia coli O111:H- str. 11128   
                                               └─ Escherichia coli O26:H11 str. 11368   
  

  
Putrescine ABC transporter putrescine-binding protein PotF (TC 3.A.1.11.2)
 (22)