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In rodents, ubiquitous α1-Na+, K+-ATPase is inhibited by ouabain and other cardiotonic steroids (CTS) at ~103-fold higher concentrations than those effective in other mammals. To examine the specific roles of the CTS-sensitive α1S- and CTS-resistant α1R-Na+, K+-ATPase isoforms, we compared the effects of ouabain on intracellular Na+ and K+ content, cell survival, and mitogen-activated protein kinases...