In addition, the GFAP level was positively correlated with the Braak stage in AD patients and NCs (p = 0.0001, r = 0.4840 in CA1; p = 0.0078, r = 0.3651 in CA2/3; p = 0.0032, r = 0.3780 in the DG; p = 0.0025, r = 0.3958 in the Sub) (Fig. 4c, d, SFig. 4d, e). Here, GFAP is linked to Alzheimer disease.