NCOR1 and hepatocellular carcinoma: To investigate whether misfolded NCoR was also ubiquitinated in HBX positive HCC cells which exhibited NCoR loss in western blooting assay (Figure 1A), level of ubiquitin conjugated NCoR in HBX positive SKhep1 or Snu423 cells treated with vehicle or MG132 was determined by immunoprecipitation assay.