HAP1 and chronic myelogenous leukemia, BCR-ABL1 positive: We chose to use the Hap1 human haploid fibroblastoid cell line, derived from a chronic myelogenous leukemic line KMB-7 isolated from a 39-year-old man with chronic myeloid leukaemia in blast crisis (Essletzbichler et al., 2014; Kotecki et al., 1999).