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Reduced Cation/Proton Exchange in nhx1 nhx2 Mutants.
(A) K+/H+ and Na+/H+ in tonoplast vesicles from leaves of Col-0 (black circles) and mutant lines L2 (white circles) and L14 (white squares) over a range of substrate cation concentrations.
(B) Average rates of cation exchange at 50 mM were significantly reduced in the mutant line L14 (nhx1 nhx2) relative to Col-0.
