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Expression of stem and precursor cell markers in the SEZ remained stable throughout adulthood. Stem cell (GFAPδ) and neuronal precursor (ASCL1) transcripts were assessed by qRT-PCR and normalized to the geometric mean of two housekeeping genes. GFAPδ (A) and ASCL1 mRNAs (B) were reliably detected in all individuals and remained stable during aging. r, Pearson’s product-moment correlation coefficient.
