KMT2D and myeloid leukemia: Kerimogulo et al. [21] have recently reported that KMT2B/MLL2 belongs to myeloid leukemia gene family, which mediates hippocampal histone 3 lysine 4 di- and trimethylation in memory formation, thus their data supports the KMT2B/MLL4 involvement along with KMT2B/MLL2 in cognition [22].