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outer membrane (GO:0019867)
The external membrane of Gram-negative bacteria or certain organelles such as mitochondria and chloroplasts; freely permeable to most ions and metabolites.
Specific
cell outer membrane (GO:0009279)
organelle outer membrane (GO:0031968)
outer endospore membrane (GO:0043594)
General
membrane (GO:0016020)
References
gene ontology: GO:0019867