More recently, with the identification of the bile acid pump sodium taurocholate cotrasporting polypeptide (NTCP) as a receptor for both HBV and hepatitis D virus [63], infection models have been set up by ectopic expression of NTCP in hepatocellular carcinoma cells [64] and in transgenic mice [65]. The gene discussed is SLC10A1; the disease is hepatocellular carcinoma.