To this end, we performed chromatin immunoprecipitation with sequencing (ChIP-seq) for three infant ALL-derived cell lines (IRX-type KMT2A-AFF1, HOXA-type KMT2A-AFF1, and HOXA-type KMT2A-MLLT1)28,29. Here, MLLT1 is linked to acute lymphoblastic leukemia.