Autor: Nelson Fausto

Editor: Irwin Arias, MD, National Institutes of Health, Bethesda, Maryland. Professor of Physiology, Emeritus, Tufts UniversitySchool of Medicine, Boston, Mass. Visiting Professor ofMedicine, Albert Einstein College of Medicine, Bronx, NY. Associate editors: James L. Boyer, Yale University School of Medicine, New Haven, CT, USA David Shafritz, Albert Einstein College of Medicine, Bronx, NY, USA Nelson Fausto, Professor and Chair, Department of Pathology, University of Washington, Seattle, WA, USA. Harvey Alter, Department of Transfusion Medicine, NationalInstitutes of Health, Bethesda, Maryland, USA David E. Cohen, .Division of Gastroenterology, Brigham andWomen“s Hospital, Boston, Massachusetts, USA Allan Wolkoff, Albert Einstein College of Medicine, Bronx, NY, USA