Woodchuck hepatocytes remain permissive for hepatitis B virus infection and mouse liver repopulation after cryopreservation: Maura Dandri, Martin R Burda, Heinrich Pette Inst for Exper Virology, Hamburg Germany; Eva Török, Joerg M Pollok, Xavier Rogiers, Dept of Hepatobiliary Surg and Transplantation, Hamburg Germany; David Zuckerman, Heinrich Pette Inst for Exper Virology, Hamburg Germany; Heiner Greten, Dept of Medicine, Hamburg Germany; Hans Will, Heinrich Pette Inst for Exper Virology, Hamburg Germany; Joerg Petersen, Dept of Medicine, Univ Hosp Hamburg-Eppendorf, Hamburg Germany