The term bone marrow-derived mononuclear cells (BM-MNCs) is used to collectively denominate bone marrow cells whose nuclei are unilobulated or rounded and which lack granules in the cytoplasm. These characteristics differ from those of myeloid cells and red cell progenitor cells, thereby facilitating separation of BM-MNCs by physical means. This cell population includes hematopoietic progenitor cells, lymphoid cells (lymphocytes, plasma cells), monocytes, and macrophages.