During the pilot, we recruited 237 postmortem donors, collecting an average of 28 tissue samples per donor spanning 54 distinct body sites (fig. S1 and tables S1 and S2). Blood-derived DNA samples were genotyped at approximately 4.3 million sites, with additional variants imputed using the 1000 Genomes phase I, resulting in ~6.8 million single-nucleotide polymorphisms (SNPs) with minor allele frequency (MAF) of ≥5% after quality control (tables S3 to S5) (14).
