POLB and chronic myelogenous leukemia, BCR-ABL1 positive: Meanwhile, knockdown of USP47 has no effect on YB-1 or POLB at mRNA level and YB-1 mRNA expression is similar in normal and CML cells (Supplementary Fig. 5c, d), indicating the increased YB-1 protein levels in primary CML cells mainly attributes to the post-transcriptional regulation of YB-1.