Our blood is made up of a diverse array of different cells, all of which originate from the same source: the ‘hematopoietic’ stem cells in our bone marrow. Dr. Cynthia Dunbar is a clinician working to understand how these stem cells grow, divide, and ultimately produce the cells that carry oxygen around the body and fight disease. Learning to safely transplant and manipulate hematopoietic stem cells could lead to treatments for a wide variety of diseases caused by a lack of properly functioning blood cells, including leukemia and aplastic anemia.