┌─ Escherichia coli (1-323/327) CFT073 (1)  
                                                                     ┌┴─ Escherichia coli M605   
                                                                    ┌┴─ Escherichia coli K12 (113)  
                                                                   ┌┴─ Escherichia coli IAI39 (1)  
┌──────────────────────────────────────────────────────────────────┴─ Escherichia coli B088 (4)  
┤                                                                ┌─ Escherichia coli (33-320/329) 042 (2)  
│                                                                │┌─ Escherichia coli (7-294/303) B354 (4)  
└────────────────────────────────────────────────────────────────┤│    ┌─ Escherichia coli (7-294/303) APEC O1 (2)  
                                                                 ││   ┌┴─ Escherichia coli (7-294/303) TA206   
                                                                 └┤  ┌┴─ Escherichia coli (7-294/303) 55989 (27)  
                                                                  │ ┌┴┬─ Escherichia coli (7-294/303) H736 (1)  
                                                                  │┌┤ └─ Escherichia coli (7-294/303) K12 (8)  
                                                                  └┤└─ Escherichia coli (7-294/303) IAI39 (1)  
                                                                   │┌─ Escherichia coli (7-294/303) MS 21-1   
                                                                   └┤┌─ Escherichia coli (7-294/303) B185   
                                                                    └┤┌─ Escherichia coli (7-294/303) 101-1 (14)  
                                                                     └┤ ┌─ Escherichia coli (7-294/303) 1044A (23)  
                                                                      └┬┴─ Escherichia coli (7-294/303) M718 (1)  
                                                                       └┬─ Escherichia coli (7-294/303) MS 69-1   
                                                                        └┬─ Escherichia coli (7-294/303) SMS-3-5   
                                                                         └┬─ Escherichia coli (7-296/303) 2362-75 (1)  
                                                                          └─ Escherichia coli (7-294/303) H299   
  
Cysteine synthase B (EC 2.5.1.47) (16)
Cysteine synthase (EC 2.5.1.47) (6)