Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains immature cells, called stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting.
Stem cells are essentially "blanks" that can be used by the body to produce any type of blood cell. As needed, stem cells in the marrow differentiate and then go through a maturation process to become one of five different types of white blood cell, or a red blood cell, or a platelet.
Related Journals of Bone Marrow Disease
Bone Reports & Recommendations, Bone Marrow Research, BMC Blood Disorders, Blood cells.
