| Q57KJ0 | CYSN_SALCH | Salmonella choleraesuis (strain SC-B67) | cysN SCH_2866 | Detail |
| Q0T1I2 | CYSN_SHIF8 | Shigella flexneri serotype 5b (strain 8401) | cysN SFV_2747 | Detail |
| A6QB12 | CYSN_SULNB | Sulfurovum sp. (strain NBC37-1) | cysN SUN_1721 | Detail |
| A5E3Q3 | CTU1_LODEL | Lodderomyces elongisporus (strain ATCC 11503 / CBS 2605 / JCM 1781 / NBRC 1676 / NRRL YB-4239) (Yeast) (Saccharomyces elongisporus) | NCS6 CTU1 LELG_04241 | Detail |
| P57499 | CYSD_BUCAI | Buchnera aphidicola subsp. Acyrthosiphon pisum (strain APS) (Acyrthosiphon pisum symbiotic bacterium) | cysD BU424 | Detail |
| Q604B7 | CYSD_METCA | Methylococcus capsulatus (strain ATCC 33009 / NCIMB 11132 / Bath) | cysD MCA2629 | Detail |
| Q9X5U0 | MMCV_STRLA | Streptomyces lavendulae | mmcV | Detail |
| B4KLL0 | CTU1_DROMO | Drosophila mojavensis (Fruit fly) | GI19452 | Detail |
| B1Z7C1 | CYSD_METPB | Methylorubrum populi (strain ATCC BAA-705 / NCIMB 13946 / BJ001) (Methylobacterium populi) | cysD Mpop_2191 | Detail |
| B7UZY2 | CYSD_PSEA8 | Pseudomonas aeruginosa (strain LESB58) | cysD PLES_48221 | Detail |