Multipotent self-renewing adherent non-hematopoietic stromal cells harvested from a patient's bone marrow and grown in vitro. When injected back into the patient, autologous expanded mesenchymal stem cells OTI-010 may differentiate into various mesenchyme-derived cell types and, in some instances, may augment bone marrow engraftment after whole-body irradiation. OR In transplantation, refers to a person's own bone marrow. Bone marrow is the soft, sponge-like tissue in the center of most large bones that produces white blood cells, red blood cells, and platelets.