┌─ Escherichia coli (331-393/393) K12 (11)  
          ┌┴──────────────────────────────── Escherichia coli (331-393/393) IAI39 (1)  
         ┌┴────────────────────────────── Escherichia coli (331-397/397) MS 124-1 (1)  
┌────────┴──────────────────────────────────────────────────────────┬─ Escherichia coli (331-397/397) B354   
│                                                                   └─ Escherichia coli (331-399/399) M718   
┤                    ┌─ Escherichia coli (331-391/391) HS (1)  
│                    │   ┌─ Escherichia coli (331-415/415) SE11   
└────────────────────┤  ┌┴─ Escherichia coli (331-417/417) TA271   
                     │ ┌┴─ Escherichia coli (331-413/413) EC4100B (1)  
                     └┬┴─ Escherichia coli (331-409/409) 53638 (1)  
                      └┬─ Escherichia coli (290-366/366) B088 (8)  
                       └┬─ Escherichia coli (331-405/405) MS 119-7   
                        └┬─ Escherichia coli (331-403/403) ETEC H10407 (4)  
                         └┬───────────────────────────── fig|1040638.4.peg.1421 O104:H4 str. LB226692   
                          └┬─ Escherichia coli (331-401/401) MS 115-1 (4)  
                           └┬─ Escherichia coli (331-397/397) ATCC 8739 (5)  
                            └─ Escherichia coli (331-399/399) 1827-70 (4)  
  

  
Homolog of E. coli HemX protein
 (15)
  
Uroporphyrinogen-III methyltransferase (EC 2.1.1.107)
 (1)
  
 Others 
(1)