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Plot of the TQF/DQF ratio RTQF/DQF vs the measured concentration [Na]i in the perfused mouse heart at baseline (filled square, n = 6) and following a 20 min intervention to elevate [Na]i; 50 μM ouabain (filled triangle, n = 6); 0 mM K+ (open diamond, n = 3), 0 mM K+/0 mM Ca2 + (filled circle, n = 3) and 0 mM K+/0 mM Ca2 +/0 mM Mg2 + (open circle, n = 3). Mean data are shown for each group ± S.E.
