terms that correctly complete the sentences. The PAMP v genes code for the MHC glycoproteins. There are three types; MHC class I are found on (Click to select) , while MHC class ll are found on (Click to select) |cells. Antigens, such as viruses, exist within a host cell and are therefore inaccessible to (Click to select) |. Proteins that are produced by viruses are broken down, and fragments known as (Click to select) | are presented on the surface of the infected host cell in a complex with the (Click to select) | molecules. (Click to select) v bind to this complex, and after receiving activation signals, secrete (Click to select) to effectively kill the infected cell. Other pathogens may exist within the body, but not within a cell. They must be taken into the cell by the process of (Click to select) |so that the epitopes can be displayed on the surface of the (Click to select) | in a complex with the (Click to select) v molecules. (Click to select) v bind to this complex and secrete (Click to select) | that stimulate differentiation into T helper 1 and 2 cells, which in turn stimulate clones of cytotoxic T cells and B cells, respectively