┬──────────────────────────────────────────────────────────────── Escherichia coli (148-459/460) MS 115-1   
└──────────────────────────────────────────────────────────┬─── Escherichia coli (148-460/460) FVEC1302 (3)  
                                                           └┬─ Escherichia coli (148-460/460) 042 (4)  
                                                            └┬─── Escherichia coli (148-460/460) H299   
                                                             └──┬─ Escherichia coli (148-460/460) HS (23)  
                                                                └┬─── Escherichia coli (148-460/460) TA143   
                                                                 └──┬─── Escherichia coli (148-460/460) M718   
                                                                    └┬─ Escherichia coli (148-460/460) K12 (63)  
                                                                     └─── Escherichia coli (148-460/460) MS 124-1 (1)  
  

  
Putative Heme-regulated two-component response regulator
 (9)