TMPRSS11F and acute myeloid leukemia: HAT‐L4 was positive in nearly all THP‐1 cells and AML–derived neutrophils and monocytes, but mostly negative in AML–derived lymphocytes and CML–derived neutrophils, monocytes and lymphocytes or NPB cells (Figure 2B), indicating that HAT‐L4 was ectopically expressed on the surface of AML–derived myeloid cells.