┌─ Escherichia coli 1044A (23)  
                                                                    ┌─┴─ Escherichia coli O157:H7 EDL933 (1)  
                                                                   ┌┴── Escherichia coli EC4100B   
                                                                  ┌┴┬── Escherichia coli B171 (1)  
                                                                  │ └┬── Escherichia coli ETEC H10407   
                                                                 ┌┤  └── Escherichia coli 2362-75 (2)  
                                                                 │└┬─ Escherichia coli K12 (79)  
                                           ┌─────────────────────┤ └┬── Escherichia coli MS 124-1   
                                           │                     │  └── Escherichia coli O111:H- str. 11128   
                                          ┌┤                     └─── Escherichia coli M605 (1)  
┌─────────────────────────────────────────┤└─ Escherichia coli (2-298/298) MS 116-1   
│                                         └─ Escherichia coli MS 146-1 (3)  
┤                                                              ┌─ Escherichia coli 536 (8)  
│                                                            ┌─┴─ Escherichia coli (2-292/292) SMS-3-5   
│                                                            │      ┌─ Escherichia coli (2-292/292) M605 (1)  
└────────────────────────────────────────────────────────────┤     ┌┴── Escherichia coli (2-292/292) 2362-75   
                                                             │    ┌┴─ Escherichia coli 83972 (15)  
                                                             │ ┌──┴── Escherichia coli SE15   
                                                             └─┤  ┌─ Escherichia coli 1125A (19)  
                                                               └┬─┴─ Escherichia coli (2-292/292) 1044A (5)  
                                                                └┬─ Escherichia coli K12 (46)  
                                                                 └┬─ fig|6666666.5357.peg.2706 TY-2482 (2-292/292) strain (10)  
                                                                  └┬── Escherichia coli MS 115-1   
                                                                   └┬── Escherichia coli 101-1 (4)  
                                                                    └─┬── Escherichia coli (2-292/292) IAI1 (1)  
                                                                      └─ Escherichia coli 042 (5)  
  

  
Formate dehydrogenase O beta subunit (EC 1.2.1.2)
 (22)
  
Formate dehydrogenase N beta subunit (EC 1.2.1.2)
 (3)
  
 Others 
(1)