SLC6A4 and Parkinson disease: In addition to the differences in striatal 123I-FP-CIT binding, in a preliminary study, Roselli and co-workers reported lower extrastriatal 123I-FP-CIT binding to SERT in the midbrain in DLB (n = 16) than in PD patients (n = 15) (Roselli et al., 2010).