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Regions of interest (ROI) used to derive time-activity curves from the cerebellum (Ce), temporal cortex (Te), pons (Po). caudate head (Ca), putamen (Pu), thalamus (Th), occipital cortex (Oc), frontal cortex (Fr), cingulate gyrus (Ci), and parietal cortex (Pa). Additional regions were placed over the hypothalamus and midbrain (not shown).
