CCAR1 and cancer: S17). A strong putative CCAR1-Kpnβ1 interaction was detected in HeLa cells, but not in hTERT-RPE-1 or WHCO5 cells, and only faint levels were detected in KYSE30 cells (see Supplementary fig. S10 for detection using a more sensitive chemiluminescent substrate). FUBP1 was found to interact with Kpnβ1 in all three cancer cell lines, and although it was detected in non-cancer hTERT-RPE-1 cells, it was pulled down to a greater extent in HeLa and KYSE30 cells compared to the non-cancer cells (Fig. 5D, Supplementary fig. S10, and S17).