Expression of miR-199a-5p and DDR1 in human HCC cell lines. Expression levels of miR-199a-5p (A) and DDR1 (B) were determined by qRT-PCR analysis for 5 HCC cell lines (Hep3B, HepG2, HuH7, SK-Hep-1 and SNU-182) and primary human hepatocytes (HH). The expression levels were normalized to reference genes, RNU44 and HMBS (A) and HMBS and GAPDH (B). Quantitative values representing the mean and SD from experiments performed in triplicate are presented. *p < 0.001 vs. primary human hepatocytes.