The external membrane of Gram-negative bacteria or certain organelles such as mitochondria and chloroplasts; freely permeable to most ions and metabolites, occurring in a host cell. [ GOC:jl ]
This is just here as a test because I lose it
Term information
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This term covers the outer membrane of the host cell envelope or the outer membrane of a host organelle. For the outer layer of the host cell envelope specifically, see host cell outer membrane ; GO:0039662.