Fig. 2: Overview of the datasets.
a, Number of samples per included cohort stratified according to the seven major brain regions. b, PCA dimensionality reduction plot of the normalized expression data after covariate correction. Each dot represents an RNA-seq sample and is colored according to the brain region. The figure shows that the samples cluster mainly on the brain region. c, Number of genotypes per cohort stratified according to ancestry. AMR, Admixed Americans; SAS, South Asian. d, Number of individuals per cohort, with each color representing an eQTL dataset. The number of individuals differ from the intersection between the number of RNA-seq samples and number of genotypes because not all samples with genotypes have RNA-seq samples and vice versa, and some individuals with genotypes have multiple RNA-seq measurements.
