EOG81C99Z GO:0019867 23/93 outer membrane cellular_component "The external membrane of Gram-negative bacteria or certain organelles such as mitochondria and chloroplasts; freely permeable to most ions and metabolites." [GOC:go_curators] EOG81C99Z GO:0005741 1/93 mitochondrial outer membrane cellular_component "The outer, i.e. cytoplasm-facing, lipid bilayer of the mitochondrial envelope." [GOC:ai] EOG81C99Z GO:0016021 1/93 integral component of membrane cellular_component "The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane." [GOC:dos, GOC:go_curators]