SLC6A4 and Parkinson disease: Additionally, a recent meta-analysis of studies in PD patients revealed a loss of thalamic and hypothalamic SERT measured with 11C-3-amino-4-(2-dimethylaminomethylphenylsulfanyl)-benzonitrile (11C-DASB), a SERT-selective PET tracer (Pagano et al., 2017).