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The first two chapters of this book introduce the nomenclature of immunology and the components of the immune system. In Chapter 1, we describe the types of immune responses and their general properties and introduce the fundamental principles that govern all immune responses. Chapter 2 is devoted to a description of the cells and tissues of the immune system, with an emphasis on their anatomic organization and structure-function relationships. This sets the stage for more thorough discussion of how the immune system recognizes and responds to antigens.