Depletion of Ars2 reduced the level of miR-6734-3p by inhibiting the interaction of Ars2 with either CBC complex or Drosha, leading to p27 up-regulation-mediated G1 cell cycle arrest, and culminating in inhibition of cell proliferation and leukemogenesis in AML (Fig. 8). The gene discussed is CDKN1B; the disease is acute myeloid leukemia.