Figure 1.

HS‐Aging neuropathological characteristics on hematoxylin‐eosin‐staining. A. Hippocampal formation without significant pathological findings. Hippocampal subfields are marked. B. A hippocampus with HS‐Aging shows severe atrophy and complete neuron loss, and gliosis in the whole CA1 area and subiculum (arrowheads). Other hippocampal areas appear intact. C. Microglia and pale eosinophilic astrocytes populate the CA1 region in HS‐Aging. Magnifications: (A, B): 2.5x; scale bar (C): 50 μm. DG = Dentate Gyrus, Sub = Subiculum.