This work focuses on the autoimmune processes that have now been proven to underlie a number of serious diseases, including diabetes mellitus, rheumatoid arthritis and multiple sclerosis. Papers explore the rapidly expanding developments in research on immune response and regulation, and their potential in the development of treatments for autoimmune diseases. The wide range of subjects covered here include: the nature of intracellular and cell surface-derived ''self'' antigens; competing theories of the generation of immune tolerance and their implications of current theories for research and treatment; possible links between autoimmunity and genetic complement deficiency; the contributions of interferons and class II HLA antigen expression to autoimmunity; and the potential of monoclonal antibodies and other biotechnological advances in treating human autoimmune conditions.