part of cell outer membrane external side of cell outer membrane https://github.com/geneontology/go-ontology/issues/31515 The leaflet of the outer membrane that is opposite to the side that faces the periplasm of the cell, including any protein embedded in, attached to, or peripherally associated with it. external side of outer membrane GO:0031240 cellular_component In GO, 'external side' still refers to part of the membrane and does not refer to components beyond (outside of) the membrane. external leaflet of cell outer membrane side of membrane