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Q57H substitution in AMT1;1 enhanced its permeability for ammonium. Changes in magnitude and Er of the inward currents activated by increasing concentrations of ammonium in water injected (H2O), AMT1;1 (wild type), and AMT1;1-Q57H (Q57H). Currents induced by the application of voltage ramps from −200 to 30 mV. Representative recordings were from 4–10 oocytes.
