A comprehensive study has mapped common and rare eQTLs across 28 immune cell types, identifying over 154,932 eQTLs affecting 17,674 genes, and revealing substantial colocalization with diseases. This research, involving TGen and other collaborators, enhances understanding of gene regulation by integrating advanced tools like scDeepID and PromoterAI, aiming to diversify cohorts and improve regulatory-variant links to health outcomes.