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Inhibition of Na,K-ATPase activity at different pH values by NaF at a constant MgCl2 concentration of 5 mm. The curves are fits using the Hill equation with a shared Hill coefficient nH = - 2.21 ± 0.07 and inhibitor constants, Ki = 1.2 ± 0.1 mm (pH 6.5), 1.6 ± 0.1 mm (pH 7.5), and 6.3 ± 0.1 mm (pH 8.5).
