Bone marrow is the soft, fatty center of some bones in the body. It contains stem cells that become various blood and immune cells, including red blood cells, white blood cells, and platelets. Each of ...

Chronic lymphocytic leukemia (CLL) is a form of cancer that leads to an atypically high level of lymphocytes within the bone marrow. Tests, such as a bone marrow biopsy, can determine how advanced CLL ...