(Supplementary Table 1). For eQTL discovery, we grouped these links based on brain region and ancestry, in which we required at least 30 samples spanning at least two cohorts. We next removed sample mix-ups and duplicate samples (Supplementary Note), resulting in the following final eQTL discovery datasets: Basal ganglia-EUR (n = 208), Cerebellum-EUR (n = 492), Cortex-EUR (n = 2,683), Cortex-AFR (n = 319), Hippocampus-EUR (n = 208) and Spinal cord-EUR (n = 108; Fig. 2c and Supplementary Table 1).
