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Low expression of miR-638 relative to U6 in the hepatocellular carcinoma cell lines SMMC-7721 (P=0.021), HepG2 (P=0.005) and Hep3B (P=0.003) compared with the healthy human hepatic HL-7702 cell line. **P<0.01, *P<0.05, Student's t test. miR, microRNA.
