EOG8WM78F GO:0009055 37/125 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] EOG8WM78F GO:0005506 37/125 iron ion binding molecular_function "Interacting selectively and non-covalently with iron (Fe) ions." [GOC:ai] EOG8WM78F GO:0020037 37/125 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] EOG8WM78F GO:0005811 1/125 lipid particle cellular_component "An intracellular non-membrane-bounded organelle comprising a matrix of coalesced lipids surrounded by a phospholipid monolayer. May include associated proteins." [GOC:mah, GOC:tb]