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Sodium dependence of d-[3H]aspartate uptake in HeLa cells expressing wild-type (▪) or Y403F-GLT-1 (•) transporters. Transport was measured by using influx solutions containing the indicated NaCl concentrations that were supplemented with choline chloride to a final concentration of 150 mM. Values are the averages ± SEM of triplicate determinations.
