┌─ Escherichia coli K12 (21)  
                                                                   ┌┴─ fig|6666666.5357.peg.2410 TY-2482 strain   
                                                                  ┌┴─ fig|1040638.4.peg.2594 O104:H4 str. LB226692 (94)  
                                                                 ┌┴─ Escherichia coli SMS-3-5   
┌────────────────────────────────────────────────────────────────┴─ Escherichia coli 536 (14)  
┤                                                                ┌─ Escherichia coli (19-131/131) O157:H7 str. EC4486 (25)  
└────────────────────────────────────────────────────────────────┤ ┌─ Escherichia coli K12 (53)  
                                                                 └┬┴─ Escherichia coli FVEC1302 (3)  
                                                                  └┬─ Escherichia coli M605   
                                                                   └┬─ Escherichia coli 83972 (1)  
                                                                    └─ Escherichia coli (19-131/131) O127:H6 str. E2348/69 (44)  
  

  
[NiFe] hydrogenase nickel incorporation protein HybF
 (6)
  
[NiFe] hydrogenase nickel incorporation protein HypA
 (3)
  
 Others 
(2)