| Q660S3 | SYC_BORBP | Borreliella bavariensis (strain ATCC BAA-2496 / DSM 23469 / PBi) (Borrelia bavariensis) | cysS BG0612 | Detail |
| A6VX53 | SYC_MARMS | Marinomonas sp. (strain MWYL1) | cysS Mmwyl1_2110 | Detail |
| Q23SI8 | TTLL1_TETTS | Tetrahymena thermophila (strain SB210) | Ttll1 TTHERM_00136210 | Detail |
| Q5UP36 | SYC_MIMIV | Acanthamoeba polyphaga mimivirus (APMV) | CARS MIMI_L164 | Detail |
| P38756 | TCD1_YEAST | Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast) | TCD1 YHR003C | Detail |
| Q9ZKW6 | SYC_HELPJ | Helicobacter pylori (strain J99 / ATCC 700824) (Campylobacter pylori J99) | cysS jhp_0818 | Detail |
| Q9ER72 | SYCC_MOUSE | Mus musculus (Mouse) | Cars | Detail |
| B7N980 | SYC_ECOLU | Escherichia coli O17:K52:H18 (strain UMN026 / ExPEC) | cysS ECUMN_0566 | Detail |
| B8DKL0 | SYC_DESVM | Desulfovibrio vulgaris (strain Miyazaki F / DSM 19637) | cysS DvMF_0482 | Detail |
| B8E391 | SYC_DICTD | Dictyoglomus turgidum (strain Z-1310 / DSM 6724) | cysS Dtur_1693 | Detail |