An introduction to the immune system, including innate, adaptive and memory immune responses. The following topics are examined in depth: inflammation, antigens and pattern recognition, complement, immune cell development, antibody and MHC gene structure and expression, antigen processing and presentation, T and B cell effector functions, allergies, transplantation, tolerance and autoimmunity. Prerequisite: BIOL 270, BIOL 270L. Co-requisite: CHEM 311.