1. Overview of the Immune System.- 2. Cells, Organs, and Microenvironments of the Immune System.- 3. Recognition and Response.- 4. Innate Immunity.- 5. The Complement System.- 6. The Organization and Expression of Lymphocyte Receptor Genes.- 7. The Major Histocompatibility Complex and Antigen Presentation.- 8. T-Cell Development.- 9. B-Cell Development.- 10. T-Cell Activation, Differentiation, and Memory.- 11. B-Cell Activation, Differentiation, and Memory.- 12. Effector Responses: Cell- and Antibody-Mediated Immunity.- 13. Mucosal Immunity and the Microbiome.- 14. The Immune Response in Time and Space.- 15. Allergy, Hypersensitivities, and Chronic Inflammation.- 16. Tolerance, Autoimmunity, and Transplantation.- 17. Infectious Diseases and Vaccines.- 18. Immunodeficiency Disorders.- 19. Cancer and the Immune System.- 20. Experimental Methods and Systems