The aim of this publication is to present the up-to-date views of the many eminent immunologists who contributed to the scientific program of the 5th European Immunology Meeting held in Istanbul in June 1982. Recent Advances in Immunology is intended for immunol ogists both in the basic sciences and in clinical medicine. It provides under one cover an assemblage of information about funda mental problems in immunology and clinical applications. The book opens with Prof. E. A. Kabat's review of the problems in understanding the structural basis of antibody complementarity. The succeeding four papers deal with the role of macrophages in the various stages of immune phenomena. The first of the two articles on T cells reports a product necessary for suppressor activity and the second describes an analysis of precursors of cytotoxic T lym phocytes. The articles dealing with immunogenetics start with the description of new loci in HLA by Prof. J. J. van Rood and co-workers followed by a paper describing the molecular cloning of H-2 class I genes. Prof. P. J. Lachmann begins the discussion on the genetics of the complement system. There are three stimulating articles on the chemistry and genetics of the complement components and their asso ciations with disease. After a review of artificial antigens and synthetic vaccines, papers on immunomodulation describe strategies for improving immunogenicity, immunomodulation in tumor systems and by xenobiotics.