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Habitat pattern of basal AHN in rodents. Estimated numbers of young neurons (DCX+ or PSA-NCAM+) as a percentage of total granule cells (normalized young neurons) relative to tentative age are markedly lower in subterranean mole rats compared with surface-dwelling rodents. Within the surface-dwelling rodents, the South African species from an environmental challenging habitat form their own cluster. (Data from Amrein et al. 2011, 2014; Cavegn et al. 2013.)
