EOG8FN6XG GO:0005739 1/41 mitochondrion cellular_component "A semiautonomous, self replicating organelle that occurs in varying numbers, shapes, and sizes in the cytoplasm of virtually all eukaryotic cells. It is notably the site of tissue respiration." [GOC:giardia, ISBN:0198506732] EOG8FN6XG GO:0004129 1/41 cytochrome-c oxidase activity molecular_function "Catalysis of the reaction: 4 ferrocytochrome c + O2 + 4 H+ = 4 ferricytochrome c + 2 H2O." [EC:1.9.3.1]