The expression of differentiation-associated surface antigens was used to identify subsets of human acute myelomonocytic leukemia cells. The leukemic colony-forming cells expressed antigens characteristic of very immature myeloid cells (Ia, MY7), while the majority of leukemic cells also expressed an antigen (MY4) characteristic of later myeloid cells. The highly proliferative MY4 negative colony-forming cells may serve as progenitor cells for the less proliferative MY4 + leukemic cells.

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