| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15597905 |
| Locus Tag | PA2709 |
| Description | cysteine synthase A |
| Strain | Pseudomonas putida H8234 |
| GI | 512579069 |
| Locus Tag | L483_24950 |
| Description | cysteine synthase |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83645402 |
| Locus Tag | HCH_02622 |
| Description | cysteine synthase A |