The advent of molecular biology and recombinant DNA technology has changed contemporary medicine profoundly. These new scientific tools have made it possible to identify and understand pathological mechanisms at cellular, subcellular and molecular levels which has added previously unimaginable novel dimensions to the diagnosis, therapy and prevention of a rapidly increasing number of diseases of the liver and biliary system. The title of this book expresses this epochal progress in hepatology. A series of acute or chronic diseases of the liver has been chosen whose modern clinical management reflects the impact of the new scientific insight gained from molecular biology. The book, the proceedings of the 87th Falk Symposium (X International Congress of Liver Diseases: Part II of the Basel Liver Week 1995) held in Basel, Switzerland, October 19-21, 1995, first presents an overview of the molecular pathology of the chosen disease, followed by discussions of the clinical inference which this new scientific information entails for diagnosis, management and therapy. This approach is expected to ease the readers' endeavour to connect basic to clinical science and to facilitate appreciation of the enormous progress but also of the inherent limitations and emerging questions which modern molecular biology has brought to clinical medicine.