SLC18A2 and Parkinson disease: Evaluation of the dopaminergic and noradrenergic systems was done in 6 minipigs using (+)-α-[11C]-dihydrotetrabenazine ([11C]-DTBZ), a marker of vesicular monoamine transporter 2 (VMAT2) availability, routinely used in PD studies23, and [11C]-yohimbine, a marker of α2-adrenoceptors.