By Vinay Kumar, MBBS, MD, FRCPath, Professor and Chairman, Department of Pathology, University of Chicago, Pritzker School of Medicine, Chicago, IL; Abul K. Abbas, MBBS, Professor and Chair, Department of Pathology, University of California San Francisco School of Medicine, San Francisco, CA; Nelson Fausto, MD, Professor and Chair, Department of Pathology, University of Washington, Seattle, WA; and Richard Mitchell, MD, PhD, Associate Professor of Pathology, Harvard Medical School, Boston, MA |