SEARCH Articles Figures Tables Absorption membrane penetration Cell membrane penetration Ion-penetrable membrane Membrane cell-penetrating peptides Membrane penetrate Membrane penetrate Membrane penetration theory Membrane polycationic penetration Membranes, natural penetrate Microorganisms, penetration membranes Ocular penetration enhancers membranes Penetration into bilayer lipid membranes Permeability of membranes competition between penetrants Polymer membrane-penetrant system Sorption in membranes competition between penetrants Two Parallel Ion-Penetrable Membranes