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Potassium dependence of ATPase activity. ATPase activities measured at 100 μM ATP for Ssb (A), 0.25 μM ATP for B-- (B), 100 μM ATP for ABB (C), 1 μM ATP for BAA (D), 0.25 ATP μM for Ssa (E), and 0.50 μM ATP for A-- (F) in the presence of increasing potassium concentrations.
