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. 2015 Jun 1;9:64. doi: 10.3389/fnana.2015.00064

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Copyright © 2015 Herculano-Houzel, Messeder, Fonseca-Azevedo and Pantoja.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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O/N ratio in most CNS structures varies with neuronal density across mouse individuals. Each data point represents one CNS structure in one individual. Values for brain structures refer to right (filled symbols) and left sides (open symbols) separately. Cx, cerebral cortex (gray and white matter combined); cb, cerebellum; ob, olfactory bulb; rob, rest of brain; sc, spinal cord. Power functions plotted are for the combined cerebral cortex, cerebellum and remaining areas (in gray; exponent, −0.818 ± 0.033, r² = 0.866, p < 0.0001) and for the spinal cord (in purple; exponent, −0.826 ± 0.117, r² = 0.745, p < 0.0001).