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Fig. 1. Allometric relationship between body mass and Na+,
K+-ATPase activity of brain homogenates in mammals and birds.
Values are means ± S.E.M. of Na+,
K+-ATPase measurements at 37°C in mammals and corrected to
37°C in birds (see Materials and methods). Data from Tables
1 and
2. The lines are the best power
fits to the data as described by the inset equations. Pi, inorganic
phosphate.