Endogenous protein levels of A20 in HCC cells and non-tumor cells were showed in Figure 1A, 1B, lower level of A20 expression was detected in three HCC cell lines, HepG2, MHCC-97H and MHCC-97L, comparing to L-02 cells, a non-tumor liver cell line. Here, TNFAIP3 is linked to hepatocellular carcinoma.