what two cells must be activated to form a normal immune response
A. The bodyâs third line of defense, immunity refers to the response mounted by the body against specific, recognized foreign molecules. B. Antigens (p. 392). 1. Before birth, the body makes an inventory of self proteins and other large molecules. 2. Antigens are generally larger molecules that elicit an immune response. a. Sometimes small molecules called haptens combine with larger molecules and become antigenic.