┌──────────────── Escherichia coli SE11   
┤                ┌─ Escherichia coli 83972 (18)  
└┬───────────────┴──────────────── Escherichia coli 536 (4)  
 └┬─ Escherichia coli K12 (79)  
  └┬──────────────── Escherichia coli TA206   
   └───────────────┬─ Escherichia coli str. K-12 substr. DH10B   
                   └───────────────┬─ Escherichia coli O157:H7 str. EC4486   
                                   └───────────────┬──────────────── Escherichia coli O157:H7 str. EC508   
                                                   └┬─ Escherichia coli O157:H7 EDL933   
                                                    └─ Escherichia coli 1044A (20)  
  

  
Biotin synthase (EC 2.8.1.6)
 (10)