Partial semi-quantitative RT-PCR for 2 genes in 24 paired tissues. A total of 10 µl RT-PCR products were electro-phoresed on 2% agarose gel containing ethidium bromide. GAPDH was used as an internal control. (RT-PCR, reverse tran-scription polymerase chain reaction; N, adjacent normal liver tissue; C, human hepatocellular carcinoma tissue; GAPDH, glyceraldehyde-s-phosphate dehydrogenase; M, pUC Mix Maker).