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Respiration rate (blue) and intracellular [K+] (red) before and after addition of 5 mM KCl. Thawed cells (~2 x 109/ml) of the indicated strains were incubated in depletion NH4+-free buffer to which 11.1 mM glucose (Gluc; left panel) or 16.5 mM sodium malate (Mal; right panel) was added at ~500 s followed by 5 mM KCl at the time point indicated by the arrow in each panel.
