Flow cytometry confirmed comparable levels of CD81 and SR-BI expression in the transduced cells compared to endogenous protein in primary human hepatocytes (PHH) and Huh-7.5 hepatoma cells (mean fluorescent intensity of CD81 on PHH – 103, HepG2-CD81 – 94, Huh-7.5 – 99 and SR-BI on PHH – 89, HepG2-CD81 – 99, Huh-7.5 – 104). Here, CD81 is linked to hepatocellular carcinoma.