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The anionic permeabilities relative to chloride from Table 1 were plotted against the Stokes diameters of the ions (determined from the limiting conductances, Robinson & Stokes, 1959). A fit of eqn (3) using the permeabilities of the larger anions (chloride, formate, bicarbonate, and acetate) gave a pore size of 0.61 nm. This is larger than the estimated α1β2γ2L GABAA receptor pore size of 0.56 nm.
