SLC18A3 and Parkinson disease: Lower VAChT binding in GBA-PD compared to the matched non-GBA-PD Group 1 included lower binding in the left and right middle and inferior occipital gyrus (L > R) and left middle and superior frontal gyrus, and left and right lentiform nucleus, precuneus and parahippocampal gyrus (Fig. 2B, P < 0.05, uncorrected).