Inhibition of human hepatitis B virus DNA polymerase (HBV DNAP) and duck hepatitis B virus DNA polymerase (DHBV DNAP) by triphosphates of thymidine analogs : P.-Z. Tao, B. Löfgren, R. Datema, and B. Oberg, Department of Virology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences, Beijing, P. R. China, Department of Medical Microbiology, University of Lund, Lund, Sweden and Department of Antiviral Therapy, Research & Development, Astra Alab AB, Södertälje, Sweden