| P0ABJ9 | n/a | 6rko | HDD | A | 603 | e6rkoA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cyt_bd_oxida_I |
| P0ABJ9 | n/a | 6rko | HDD | A | 603 | e6rkoA2 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cyt_bd_oxida_I |
| P0ABJ9 | n/a | 6rx4 | HDD | A | 603 | e6rx4A1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cyt_bd_oxida_I |
| P0ABJ9 | n/a | 6rx4 | HDD | A | 603 | e6rx4A2 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cyt_bd_oxida_I |