Unlike MV4;11, the MOLM13 cell line harbors an MLL-AF9 translocation and is heterozygous for the FLT3-ITD mutation (Quentmeier et al., 2003), lesions that have been shown to cooperate to reduce the latency of leukemia onset in mice (Stubbs et al., 2008). Here, MLLT3 is linked to leukemia.