Coexpression of IL-2Rα and myeloid antigen (CD13) on the leukemia cells from a representative case of IL-2Rα+CD4+AML was confirmed by double immunostaining (Fig 4), showing that IL-2Rα was actually expressed on AML cells, but not on T-lymphocytes. This evidence concerns the gene IL2RA and acute myeloid leukemia.