The expression was individually normalized to their basal expression in cells supplemented with tryptophan, and only ERRFI1 expression increased significantly in PLC8024, HepG2, and SMMC-7721, three sensitive HCC cells, but not in MHCC-97H, MHCC-97L, and Huh7, three resistant cells (Fig. 2C), which was in line with the RNA-sequencing data. Here, ERRFI1 is linked to hepatocellular carcinoma.