Human bone marrow mononuclear cells are isolated from whole bone marrow of a single donor. This heterogeneous cell population allows researchers to isolate various cell types of the immune system. Human bone marrow mononuclear cells contain CD34+ stem cells. Human bone marrow mononuclear cells enable researchers to investigate the immune system, stem cells, and regenerative medicine. In addition, they may be used for developmental studies. Duchenne Muscular Dystrophy is a recessive X-linked form of muscular dystrophy characterized by rapid progression of muscle degeneration.