ARRB1 and breast cancer: PCR and subsequent agarose gel electrophoresis (AGE) results showed that AEP/tDDX3X-C enhanced the ES of PRDM2 exon 2, ARRB1 exon 13, and NCOR2 exon 21 in both glioma and breast cancer cells (Figure 5H and Supplemental Figure 7D).