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Expression of Cat S in HCC cell lines is positively correlated with metastatic capacity. (A) Results of reverse transcription-polymerase chain reaction assay of Cat S mRNA in 7 HCC cell lines (*P<0.05 compared with L02 normal liver cell line). (B) Expression of Cat S protein was determined by western blot analysis with 40 µg of protein from each sample. β-actin served as a loading control. HCC, hepatocellular carcinoma; Cat S, cathepsin S; mRNA, messenger RNA.
