The dual immunity systems and resistance to infection.
D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D002462:Cell Membrane / Q000276:immunology; D003165:Complement System Proteins; D006649:Histocompatibility Antigens; D006801:Humans; D007111:Immunity, Cellular; D007136:Immunoglobulins; D007239:Infections / Q000276:immunology*; D051379:Mice; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
D006649:Histocompatibility Antigens; D007136:Immunoglobulins; D003165:Complement System Proteins