| O66459 | DB18267 | 6kls | HEM | B | 502 | e6klsB2 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| O66459 | DB18267 | 6kls | HEM | E | 502 | e6klsE1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| O66459 | DB18267 | 6klv | HEM | B | 502 | e6klvB2 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| O66459 | DB18267 | 6klv | HEM | E | 502 | e6klvE1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |