KLF4 and acute lymphoblastic leukemia: Using an miRNASelect pMIR-GFP reporter assay, we confirmed that miR-2909 targeted KLF4 in B-ALL but not in T-ALL by constructing plasmids containing the 3′UTR and the miR-2909 target site from the B-cell (pGFP-KLF4-3′UTR-B) and T-cell lineages (pGFP-KLF4-3′UTR-T).