Chapter 20, Problem 17CYU

Class II MHC proteins display what kind of antigens? What class of T cell recognizes antigens bound to class II MHC? What types of cells display these proteins?

Figure 20.20 Simplified summary of the primary immune response.

Co-stimulation usually requires direct cell-cell interactions; cytokines enhance these and many other events. Although complement, NK cells, and phagocytes are innate defenses, they are enlisted in the fight by cytokines. (For simplicity, only B cell receptors are illustrated.)