Sean Morrison, Ph.D., from the Children's Medical Center Research Institute at UT Southwestern, investigates how stem cells function, regenerate, and interact with their surrounding environment in the bone marrow. His research reveals how leptin receptor-positive cells—key components of the bone marrow niche—regulate hematopoietic stem cell maintenance and regeneration, influence platelet production, and respond to physiological stress like pregnancy. Morrison uncovers a reciprocal relationship between these niche cells and peripheral nerves, showing that disrupting nerve signals impairs bone marrow recovery after chemotherapy or radiation. His work also links retrotransposon activation during pregnancy to increased red blood cell production, with implications for maternal health and transplant medicine. (#40449)