| I2WBK2 | DB18267 | 7jz2 | HEM | D | 201 | e7jz2D1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| I2WBK2 | DB18267 | 7jz2 | HEM | G | 201 | e7jz2H1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |
| I2WBK2 | DB18267 | 7jz2 | HEM | K | 201 | e7jz2L1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Fumarate reductase respiratory complex transmembrane subunits | Sdh_cyt |