KMT2A and leukemia: The presence of distinct epigenetic landscape in LSCs from MLL (KMT2A)‐rearranged (MLLr) leukaemias, for example, aberrant H3K4me2/3 patterns and/or EP300 associated pervasive enhancer malfunction, separate LSC from non‐self‐renewing progeny of leukaemia cells.