Immortalized embryonic hepatocytes were cultured in Medium 199 (WelGENE) that was supplemented with 10% fetal bovine serum (WelGENE) and 1% penicillin-streptomycin (WelGENE), as previously described (Back et al., 2009 (link)). AML12 muse normal hepatocytes were obtained from the American Type Culture Collection (ATCC, USA). The cells were cultured in DMEM/F12 (WelGENE) that was supplemented with 10% fetal bovine serum (WelGENE), 100 nM dexamethason (Sigma-Aldrich), 1% insulin-transferrin-selenium-pyruvate supplement (ITSP; WelGENE), and 1% penicillin-streptomycin (WelGENE). The Lenti-X 293T Cell Line (Clontech, USA) was cultured in DMEM (WelGENE) containing 10% fetal bovine serum (WelGENE) and 1% penicillin-streptomycin (WelGENE).