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Gramicidin channel function. (a) Cation conducting β6.3-helical gramicidin A (gA) channels form by transmembrane dimerization of two non-conducting gA monomer subunits. (b) When amphiphiles (drugs) are added to the aqueous phase and partition into the bilayer, it will alter physical properties and thereby shift the gramicidin monomer ↔ dimer equilibrium, usually toward the dimer.
