ABL1 and acute myeloid leukemia: Multiple retained introns (n=14) were identified in the 5 primary and PDX AML samples in the following genes: ZCCHC7, ABL1, JAK2, IRF8, TAL1, CEBPG, ETV6, KMT2A, MLLT10, KLF2, and PRDM16 (Supplementary Table 2).