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Variation in total (a), neuronal (b), and nonneuronal (c) cell density in the cerebral cortex, cerebellum, and remaining areas as a function of structure mass. All graphs are fitted with power functions whose exponents are indicated. (a and b) All P < 0.0001. (c) P = 0.0009 (Cx and Cb); P = 0.0611 (Ra).
