MLLT3 and leukemia: The inhibition of the (H3K9)‐demethylase JMJD1C, on the other hand, causes only minor defects with respect to blood homeostasis and has a minor influence on the self‐renewal of the hematopoietic stem cells with a simultaneous reduction of LSC frequency in MLL‐AF9‐ and HOXA9‐driven leukemias [9].