Abstract: Foreword: von Weizsacker, F. Roggendorf, M. The Woodchuck: A Model for Immunopathogenesis and Therapy of Hepadnaviral Infection: Roggendorf, M. Lu, M. Pathogenesis of Hepatitis B Virus in Transgenic Mice: Sitia, G. Iannacone, M. Chisari, F.V. Guidotti, L.G. Transfer of HBV Genomes into Mice: Oberwinkler, H. Untergasser, A. Sprinzl, M. Protzer, U. Recent Advances in the Duck Hepatitis B Virus Model: Jilbert, A.R. Determinants of Hepadnaviral Species and Liver Cell Tropism: Funk, A. Lin, L. Mhamdi, M. Will, H. Sirma, H. T-Cell Response to Hepatitis B and C Virus: Lessons from the Chimpanzee Model: Thimme, R. Bukh, J. Spangenberg, H.C. Wieland, S.F. Blum, H.E. Purcell, R.H. Chisari, F.V. The Replicon System as an Efficient Tool to Study HCV RNA Replication: Lohmann, V. Hepatitis B Virus Infection of Primary Tupaia Hepatocytes: Kock, J. Glebe, D. Tupaia belangeri as a Model for Hepatitis C Virus Infection: Baumert, T.F. Barth, H. Zhao, X. Schurmann, P., Tang, Z.-Y. Adah, M.I. Blum, H.E. von Weizsacker, F. Primary Human Hepatocytes as an in vitro Model for Hepatitis B Virus Infection: Boehm, S. Thasler, W.E. Weiss, T.S. Jilg, W. Progress and Perspectives of the uPA/RAG-2 Mouse Model: Liver Repopulation and Viral Infection Studies: Dandri, M. Burda, M.R. Matschl, U. Wursthorn, K. Petersen, J. The Trimera Mouse Model of HBV and HCV Infection: Bocher, W.O. Reisner, Y.