By using DAT-specific N-(3-18F-Fluoropropyl)-2β-carbomethoxy-3β-(4-iodophenyl)nortropane (18F-FP-CIT) PET, PD(ICD)+ patients have shown significantly higher DAT density in the dorsal posterior cingulate and insular cortices as compared to PD(ICD)− [56]. Here, SLC6A3 is linked to Parkinson disease.