Extended Data Table 1 Species information

From: Allometric rules for mammalian cortical layer 5 neuron biophysics

  1. Mouse, rat, guinea pig, rabbit, marmoset, macaque and human data points were taken directly from Table 1 in a previous study10. Gerbil data were not available. Ferret data were taken from Table 1 in a previous study34. For Etruscan shrews, the cortical volume was found to be 5.3 ± 1.4 mm3 per hemisphere18. The volume was doubled for total cortical volume and converted to mass (0.01098 g) using the brain specific density (1.036 g cm−3) (ref. 33). Using cortex size and number of cortical neurons3, we calculated neuronal density (191,229 N mg−1).
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