This text discusses the benefits of the adaptive immune response, primary disease & immunological memory, self recognition, T cell-mediated immune responses, antigens, antigen processing & presentation, professional antigen-presenting cells, T cell development & differentiation, mechanisms of T cell-mediated immune responses, clonal selection & expansion, the cellular basis of immunological memory, T cell types & their functions, helper T cells & their cytokines, cytotoxic T cells, and regulatory T cells.