SLC6A3 and Parkinson disease: Previous research in animal models of PD combined radio-isotopic and functional magnetic resonance imaging (fMRI) to investigate the relations between dopaminergic damage (tracked via DAT scan), D2 receptor sensitivity (measured with raclopride, a dopamine agonist), and blood oxygenation level–dependant (BOLD) response after infusion of apomorphine (Nguyen et al. 2000; Zhang et al. 2000, 2001, 2006).