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Immune response. A response from the body to an antigen that occurs when the antigen is identified as foreign and that induces the production of antibodies and lymphocytes capable of destroying the antigen or making it harmless.
An immune response involves Lymphocytes (B-cells and T-cells) and antigen presenting cells (macrophages, B-cells, and dendritic cells). Clonal selection is the proliferation of B-cell and T-cell clones against a specific antigen. B-cell responses are called Humoral immune responses. T-cell responses are called cell-mediated immune responses. The pathway used to present antigens to the immune system depends on weather the antigen is an exogenous antigen or endogenous antigen.