MEIS1 and leukemia: Notably, after treating MV4;11 cells with 100 nM inhibitor for 7 days we observed no discernable effect on the expression of HOXA9 and MEIS1 (Figure 1D and E), despite the emphasis on these genes as the critical mediators of DOT1L’s effects in MLL-r leukemia (Okada et al., 2005; Bernt et al., 2011; Guenther et al., 2008; Daigle et al., 2011; Deshpande et al., 2013).