[18F] N-(3-fluoropropyl)-2β-carboxymethoxy-3β-(4-iodophenyl)nortropane (FP-CIT) has recently been demonstrated to have utility in dopamine transporter imaging in PD and related syndromes, with comparable image quality to [11C]-PE2I (Hong et al., 2018). Here, SLC6A3 is linked to Parkinson disease.