Representative images of AβO immunoreactivity (detected using anti-oligomer monoclonal antibody NU4) in the hypothalamus of control, sham-operated adult cynomolgus macaques (Sh; n = 3) or macaques that received i.c.v. injections of AβOs (n = 3; see Materials and Methods). Nuclear staining (DAPI) is shown in blue. Insets show optical zoom images of the areas indicated by white dashed rectangles in the main panels. Scale bars = 100 and 20 μm for main panels and insets, respectively. 