| V0YWY6 | DB18267 | 6wu6 | HEM | C | 201 | e6wu6D1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| V0YWY6 | DB18267 | 6wu6 | HEM | G | 201 | e6wu6H1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| V0YWY6 | DB18267 | 6wu6 | HEM | K | 201 | e6wu6L1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |