| P00165 | DB03317 | 6rqf | HEC | A | 303 | e6rqfA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| P00165 | DB03317 | 6rqf | HEC | I | 303 | e6rqfI1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| P00165 | DB03317 | 7qrm | HEC | A | 303 | e7qrmA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| P00165 | DB03317 | 7qrm | HEC | I | 2004 | e7qrmI1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| P00165 | DB03317 | 7zyv | HEC | A | 303 | e7zyvA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| P00165 | DB03317 | 7zyv | HEC | I | 303 | e7zyvI1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |