EOG83N9XP	GO:0009055	1/2	electron carrier activity	molecular_function	"Any molecular entity that serves as an electron acceptor and electron donor in an electron transport chain. An electron transport chain is a process in which a series of electron carriers operate together to transfer electrons from donors to any of several different terminal electron acceptors to generate a transmembrane electrochemical gradient." [ISBN:0198506732]
EOG83N9XP	GO:0020037	1/2	heme binding	molecular_function	"Interacting selectively and non-covalently with heme, any compound of iron complexed in a porphyrin (tetrapyrrole) ring." [CHEBI:30413, GOC:ai]
EOG83N9XP	GO:0005506	1/2	iron ion binding	molecular_function	"Interacting selectively and non-covalently with iron (Fe) ions." [GOC:ai]