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Sulfur reduction enzymes and their presence in the three sulfur-reducing heterotrophic crenarchaeotes.
| Enzyme | S. marinus | T. pendens | H. butylicus |
| Sulfur/polysulfide reductase (molybdoenzyme) | - | Tpen_1121-1123 | Hbut_0371-0373 |
| Sulfhydrogenase | - | - | - |
| Sulfide dehydrogenase | - | - | - |
| NADPH:sulfur oxidoreductase | - | Tpen_0143 | Hbut_0802 |
| mbh/mbx-related | Smar_0018-0030, Smar_0645-0657, Smar_1057-1071 | - | - |
