| Q57038 | n/a | 7r0w | ECH | A | 304 | e7r0wA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| Q57038 | n/a | 7r0w | ECH | I | 305 | e7r0wI1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| Q57038 | n/a | 7zxy | ECH | A | 301 | e7zxyA1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |
| Q57038 | n/a | 7zxy | ECH | I | 301 | e7zxyI1 | Transmembrane heme-binding four-helical bundle | Transmembrane heme-binding four-helical bundle | Transmembrane di-heme cytochromes | Cytochrome_B |