┌─ Escherichia coli WV_060327   
                                       ┌────────────┴───────────── Escherichia coli SE15   
                          ┌────────────┴┬───────────── Escherichia coli 536 (4)  
             ┌────────────┤             └───────────── Escherichia coli M605   
            ┌┤            └─ Escherichia coli 83972 (6)  
            │└────────────────────────┬───────────── Escherichia coli 2362-75   
           ┌┤                         └─ Escherichia coli E2348/69 (1)  
           │└────────────┬─ Escherichia coli NC101   
┌──────────┤             └───────────── Escherichia coli APEC O1 (7)  
┤          └───────────── Escherichia coli TA206   
│             ┌───────────── Escherichia coli 042 (5)  
└─────────────┤ ┌───────────── Escherichia coli 101-1 (11)  
              │┌┴───────────── Escherichia coli B088 (3)  
              └┤┌─ Escherichia coli B354 (8)  
               └┤┌───────────── Escherichia coli B185   
                └┤                        ┌─ Escherichia coli O55:H7 str. CB9615   
                 └────────────┬───────────┴───────────── Escherichia coli 1044A (24)  
                              └┬─ Escherichia coli K12 (16)  
                               └────────────┬───────────── Escherichia coli MS 124-1 (1)  
                                            └┬─ fig|1040638.4.peg.4702 O104:H4 str. LB226692 (20)  
                                             └┬───────────── Escherichia coli 53638 (2)  
                                              └────────────┬───────────── fig|6666666.5357.peg.3839 TY-2482 (1-312/318) strain   
                                                           └─ Escherichia coli (1-312/318) 55989 (1)  
  

  
Putrescine transport system permease protein PotH (TC 3.A.1.11.2)
 (21)
  
 Others 
(2)