Barely Significant

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For species for which information is available, the number of levels across species indeed follows an increasing trend as a function of the effective population size, ranging from n =5 in humans with relatively small effective population size of ∼10 4 and correspondingly less efficient selection, n =8 in macaque with intermediate effective population size of the order of 10 5 , and n =10 in mice with the largest effective population size of ∼5 × 10 5 (refs 48 , 49 ).
However, the lower but still clearly significant decrease in cortical tissue stiffness at greater distances from the injury site (that is, 500–1,000 μm, corresponding to regions A′, C′ and D′ in Fig. 2 ), particularly in those regions containing myelinated fibres of the cingulum (regions medial to the scar, Fig. 3 and Supplementary Table 4 ), was mostly accompanied by an upregulation of glial intermediate filaments ( Fig. 5b, c and Supplementary Fig. 4b, c ).