Our paper on the origins of stem cell variation is out now in Nature Communications. Using fluctuating methylation clocks as barcodes to measure blood stem cell clonal composition in twins… we show that the variation in the hematopoietic stem cell pool that (in most of us) leads to clonal hematopoiesis in later life is likely present before birth. Led by postdoc Jesse in collaboration with Jazlyn Mooney (QCB) and Darryl Shibata (USC Keck).