SEARCH Articles Figures Tables Gram negative Gram-negative bacteria cell membrane Gram-negative bacteria cytoplasmic membrane Gram-negative bacteria inner membrane Gram-negative bacteria outer membrane Grams Major outer membrane proteins Gram-negative bacteria Membrane double, of gram-negative bacteria Membrane, Gram-negative bacteria Outer membrane (in Gram-negative Outer membrane of Gram-negative Outer membrane of Gram-negative bacteria Outer membrane proteins Gram-negative bacteria