| Module |
| M00176 | Assimilatory sulfate reduction, sulfate => H2S |
| M00595 | Sulfur oxidation, SOX system, thiosulfate => sulfate |
| M00596 | Dissimilatory sulfate reduction, sulfate => H2S |
| M00984 | Sulfur oxidation, tetrathionate intermediate (S4I) pathway, thiosulfate => sulfur + sulfate + thiosulfate |
| M00987 | Assimilatory sulfate reduction, plants, sulfate => H2S |
|