ETV6 and leukemia: These included human leukaemic cell line REH as a representative of ETV6‐RUNX1+ leukaemia, where we have down‐regulated WBP1L by a single shRNA specific for human WBP1L and immortalized murine monocyte/macrophage progenitors as a representative of bone marrow progenitors, where we used a different shRNA targeting murine Wbp1l (Figure 4A,B).