┌─── Escherichia coli (1-74/90) M718   
                                                                 ┌┴─── Escherichia coli (1-74/90) B354   
                                                                ┌┴─ Escherichia coli (1-74/90) K12 (128)  
┬───────────────────────────────────────────────────────────────┴─── Escherichia coli (1-74/90) H591 (2)  
└────────────────────────────────────────────────────────────┬─ Escherichia coli HS (1)  
                                                             └──┬─── Escherichia coli EC4100B   
                                                                └┬─ Escherichia coli K12 (127)  
                                                                 └┬─── Escherichia coli MS 200-1   
                                                                  └─── Escherichia coli MS 21-1   
  

  
[NiFe] hydrogenase metallocenter assembly protein HybG
 (5)
  
[NiFe] hydrogenase metallocenter assembly protein HypC
 (4)