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DNA recording system reveals how a single cell becomes a body Scientists have recorded how a single fertilized egg becomes a complex body, uncovering hidden patterns of development that could shed light on birth defects and cancer. Date: October 13, 2026 Source: University of Washington School of Medicine/UW Medicine Summary: Scientists have traced the development of a mouse embryo from its first two cells to the formation of organs, using a remarkable DNA recording system that reveals the family history of individual cells. Their findings uncover how different cell types emerge on their own schedules and could help explain what goes wrong in birth defects, genetic disorders, and cancer.