Using isoform specific primers, we demonstrated the presence of four out of five OLFM4 mRNA isoforms (OLFM4a–OLFM4d) in CML iCD34+ cells and the entire set of five mRNA isoforms (OLFM4a–OLFM4e) in CML iCD34− cells (Supplementary Fig. S4a). Here, OLFM4 is linked to chronic myelogenous leukemia, BCR-ABL1 positive.