Paul Ehrlich in His Time: A Historian's View.- The Dawn of Immunology: The Era of Paul Ehrlich.- Soluble Lymphocyte Receptors.- Structure and Function of Antigen-Receptor Complexes on Murine B Lymphocytes.- The Biology of Mammary Cancer.- Virus Quasispecies.- Retroviruses: Nature's Genetic Engineers.- Retroviruses and Autoimmunity.- Genetic Control of De Novo Conversion to Infectious Amyloids of Host Precursor Proteins: KuruKuru - CJD - Scrapie.- How Vaccines Work: Different Patterns for Different Diseases.- The Future of Immunological Drugs.- Vaccines in Perspective: Human Hepatitis B Vaccines, the First Subunit and Recombinant Viral Vaccines.- Immunopathogenesis of HIV/SIV Infections: Consequences for the Development of AIDS Vaccines.