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ABCB4 and PIN2 are highly selective for IAA− over Cl−, and the selectivity approximately doubles when the two are co‐expressed. The Goldman‐Hodgkin‐Katz model of membrane transport was parameterized with values of Cl− permeability (PCl) relative to Cs+ permeability (PCs) calculated from the results in Figure 2D to determine the permeability of IAA− relative to Cl− (PIAA: PCl) based on the ΔErev values presented in Figure 3D
