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Percent mass (filled circles), cells (filled triangles), and neurons (open circles) contained in the cerebral cortex (a), cerebellum (b), and remaining areas (c) relative to the whole brain in each species, arranged by increasing brain size. Bars indicate SD. Spearman correlation coefficients (ρ) and P values are indicated. mo, mouse; ha, hamster; ra, rat; gp, guinea pig; ag, agouti; ca, capybara.
