proteolysis with trypsin , which digests only the cytoplasmic surface of these membranes ( because the external surface is protected by its attachment to beads ) , revealed that the internal proteins , l , p , np , and m , were present on the cytoplasmic surface of the membrane and that small segments of the viral envelope glycoproteins , hn and f0 , were partially exposed on the cytoplasmic surface .
C0007603
cytoplasmic
C0010834
cytoplasmic