Antagonizing Self-Renewal in Acute Myeloid Leukemia: ID2 Takes the Stage.

E proteins and their functional antagonists, the ID proteins, have significant roles in normal hematopoiesis. In this issue of Cancer Cell, Ghisi et al. show that high ID2 levels antagonize self-renewal and promote differentiation of leukemic stem cells in the MLL-translocated molecular subtype of acute myeloid leukemia.