DRD2 and Alzheimer disease: Interestingly we also detected a loss of D2R positive, post synaptic terminals in PD and AD cases (p ≤ 0.001, n = 6 images analysed per case) compared to controls and in PD cases compared to DLB cases (p ≤ 0.01, n = 6 images analysed per case) (Fig. 2b).