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Potassium-[3H]digoxin antagonism. Yeast membranes harboring α2β1, α2β2, or α2β3 Na,K-ATPase were incubated with varying concentrations of KCl, and residual [3H]digoxin binding was measured. The lines represent Hill fits. Data points for α1β1 were taken from Ref. 25. Error bars, S.E. from 3 experiments.
