This volume addresses critical issues in xenotransplantation, providing open and non-partisan discussion of related scientific and policy questions. Three areas covered are: 1) international, collaborative, multidisciplinary research in xenotransplantation; 2) the practical applications of such research; and 3) comparative socioeconomic analysis, risk assessment and public policy evaluation of transplantation technologies. The authors include specialiasts on monitoring, economics, ethics, law and policy from a number of countries. It is hoped that this volume will open a new international dialogue of the regulatory aspects of xenotransplantation.