| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15597905 |
| Locus Tag | PA2709 |
| Description | cysteine synthase A |
| Strain | Pseudomonas stutzeri ATCC 17588 = LMG 11199 |
| GI | 339494452 |
| Locus Tag | PSTAB_2375 |
| Description | cysteine synthase A |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83645402 |
| Locus Tag | HCH_02622 |
| Description | cysteine synthase A |