┌──── Escherichia coli (4-83/83) MS 69-1 (1)  
                                                   ┌┴─ Escherichia coli (6-85/85) K12 (19)  
┌──────────────────────────────────────────────────┴─ Escherichia coli (6-85/85) O157:H7 (3)  
│                                              ┌─ Escherichia coli (1-63/85) B171 (8)  
┤                                             ┌┴─ Escherichia coli (4-50/72) MS 145-7 (3)  
│       ┌─────────────────────────────────────┴─┬──────────────────── Escherichia coli (1-74/85) O83:H1 str. NRG 857C   
└───────┤                                       └─ Escherichia coli (1-63/85) B7A   
        └───────────────────────────────────────────┬─ Escherichia coli IAI39 (1)  
                                                    └─┬─ Escherichia coli M718   
                                                      └┬─ Escherichia coli ETEC H10407   
                                                       └┬─ Escherichia coli ED1a (1)  
                                                        └─ Escherichia coli K12 (95)  
  

  
Programmed cell death antitoxin MazE
 (5)
  
Programmed cell death antitoxin PemI
 (4)
  
Programmed cell death antitoxin ChpS
 (3)