In this study, the authors reported that BM sorted CD26+ LSCs cells were confirmed to be BCR-ABL1+ and in short-term colony assays and in long-term culture-initiating cells, colony cells derived from CD26+ LSCs (obtained from CML patients) contained BCR/ABL1mRNA, whereas cells of colonies derived from CD26− SC (from the same patients) did not contain BCR-ABL1. Here, ABL1 is linked to chronic myelogenous leukemia, BCR-ABL1 positive.