AbstractThe capacity of thallium to substitute for K+in activation of (Na+, K+)‐ATPase of liver plasma membranes was studied. Our results indicate that Tl+can replace K+in the activation of the (Na+, K+)‐ATPase of liver plasma membranes. In the presence of Na+, similar activation is obtained with Tl+concentrations only 1/10 of those of K+. In all other aspects, the (Na+, K+)‐ and (Na+, Tl+)‐ATPases were found to be id
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