OXIDOREDUCTASE, COPPER, ELECTRON TRANSPORT, FORMYLATION, HEME, IRON, MEMBRANE, MITOCHONDRION, MITOCHONDRION INNER MEMBRANE, RESPIRATORY CHAIN, TRANSMEMBRANE, TRANSPORT, ACETYLATION, TRANSIT PEPTIDE, ZINC, ISOPEPTIDE BOND, UBL CONJUGATION 3AG4 BOVINE HEART CYTOCHROME C OXIDASE IN THE CYANIDE ION-BOUND FULLY REDUCED STATE AT 100 K