Med-Pathway.com MCAT Test Prep Immune system. Nice comprehensive and fairly short review of basic immunology. Dr. Phil goes over the AAMC Content Outline for Immunology including adaptive vs innate, self vs non-self, primary and secondary immune organs, Antibody Structure/Function, ELISA, Western blots, B and T cells, clonal selection, antigen presenting cells and major histocompatibility complex (MHC), Toll like receptors and pattern recognition of lipopolysaccharide (LPS) and flagella, chemotaxis, V(D)J and isotype switching.