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Methylammonium uptake by AMT mutants. A, methylammonium tolerance was tested by plating DL1 expressing AMT1;1 mutants on YNB with 5 mm methylammonium and 0.1% proline. Empty vector served as a control. B, shown are methylammonium uptake rates mediated by AMT1;1-Q57H. Error bars indicate S.D. of nine replicates.
