Graphic Abstract (IMAGE) Princess Máxima Center for Pediatric Oncology Caption Osorio et al. report lifelong mutation accumulation in human hematopoietic stem and progenitor cells, which is explained by three distinct mutational signatures. Shared somatic mutations between cells of the same donor enable the construction of a developmental lineage tree and quantification of each branch to mature blood cell populations. Credit Osorio et al., <em>Cell Reports</em>, 2018 Usage Restrictions Image may only be used with the appropriate caption and credits. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.