1E2R:
reference: X-ray crystallographic study of cyanide binding provides insights into the structure-function relationship for cytochrome cd1 nitrite reductase from Paracoccus pantotrophus., Jafferji A, Allen JW, Ferguson SJ, Fulop V, J Biol Chem 2000 Aug 18;275(33):25089-94. PMID: 10827177

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).