In the present study we therefore used an already established processing method that does not require MRI scans for co-registration (Joling et al., 2017; Vriend et al., 2014; Vriend et al., 2014), to be able to compare DAT and SERT binding in carefully matched PD and DLB patients and healthy controls. The gene discussed is SLC6A4; the disease is Parkinson disease.