Nature, Published online: 15 January 2025; doi:10.1038/s41586-024-08244-9The developmental Genotype-Tissue Expression (dGTEx) projects will catalogue and integrate gene expression, regulation and genetics data across 120 human donors from birth to adulthood with developmentally matched non-human primates, including 126 rhesus macaques and 72 common marmosets.