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Fig. 3. Allometric relationship between body mass and sodium pump molecular activity in the brain of mammals and birds. Values are means ± S.E.M. Molecular activity values were calculated by dividing maximal Na+, K+-ATPase activity at 37°C by the sodium pump density for the same animal. Data from Tables 1 and 2. The lines are best power fits to the data as described by the inset equations.