Most notable among these was the Slc15A2 gene encoding an oligo-/dipeptide transporter, which quantitative real-time RT–PCR analyses confirmed was highly expressed in LT-CML stem cells compared with not only CML-KLS− progenitors but also normal LT-HSCs (Fig. 2a; Supplementary Data 2). The gene discussed is SLC15A2; the disease is chronic myelogenous leukemia, BCR-ABL1 positive.