Six-month-old mice were treated for 30 days with vehicle (N=7), 0.5 mg/kg (N=6), 5 mg/kg (N=6), or 25 mg/kg (N=7) NOR. Treatment with NOR reduced the number of cells immunoreactive for human α-syn in both A. cortex and B. hippocampus. C & D. Representative sections from the hippocampus show reduced α-syn accumulation (green) in cell bodies and the neuropil without affecting neuronal architecture as judged by NeuN immunostaining (red). White arrows indicate hippocampal pyramidal cell layer; white asterisks indicate hippocampal neuropil. Data represent mean ± SEM. Statistical significance determined by one-way ANOVA with Dunnett’s post hoc test. *p ≤ 0.05, **p ≤0.01, *** p ≤ 0.001.