outer membrane

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  1. (in eukaryotes) the more external of the two membranes that surround a chloroplast, a mitochondrion, or a nucleus.
  2. (in prokaryotes) the layer of lipopolysaccharide, lipoprotein, and protein that lies external to the peptidoglycan in the cell wall of a Gram-negative bacterium.

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mitoplast (cell and molecular biology)