Antibodies including anti-mouse CD5, CD11b, CD45R (B220), Ly-6G (Gr-1), and TER-119 can be used to efficiently tag bone marrow-derived cells committed to major hematopoietic lineages, including T lymphocytes, B lymphocytes, monocytes/macrophages, granulocytes, and erythrocytes. These antibodies can be used in conjunction with magnetic particle separation systems or flow cytometric cell sorting to deplete lineage-committed cells and enrich for uncommitted hematopoietic progenitors.