The Genotype-Tissue Expression (GTEx) project is an ongoing effort to build a comprehensive public resource to study tissue-specific gene expression and regulation. Samples were collected from 53 non-diseased tissue sites across nearly 1000 individuals, primarily for molecular assays including WGS, WES and RNA-seq. Remaining samples are stored in the GTEx Biobank. The GTEx Portal provides open access to data including gene expression, QTLs, and histology images.