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The bacterial cell wall of Gram-negative bacteria consists, in addition to the cytoplasmic membrane, of another permeability barrier, the outer membrane. The lipid distribution between both sides of this membrane is strictly asymmetric. The outer leaflet is made up of glycolipids, usually lipopolysaccharides. In Sphingomonas spp glycosphingolipids were found to substitute for lipopolysaccharides....
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