This second edition has been revised and expanded to meet the needs of today's medical students. In keeping with the original edition's ``less-is-more'' philosophy, this comprehensive yet concise text now includes coverage of AIDS immunology, T-Cell receptors, interleukins and other growth regulatory cytokines. Chapters feature clear, succinct introductions as well as sample questions and answers that prepare students for the national board examinations. The references have been updated, and the material now incorporates 10% more illustrations. (view table of contents)