Prokaryotic cell
Cell outer membrane
The prokaryotic outer cell membrane is the selectively permeablemembrane which separates the prokaryotic periplasm from its cellsurroundings. Traditionally only Gram-negative bacteria were thoughtof as having an outer membrane, but recent work has shown someActinobacteria, including Mycobacterium tuberculosis, as well as atleast 1 archaea (Ignicoccus hospitalis) have a cell outer membrane
- Outside: Extracellular
- Inside: Periplasmic space