title: Immunology: two immune systems capture attention.
mesh_terms: D000375:Aging; D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002060:Bursa of Fabricius / Q000276:immunology; D002645:Chickens; D006801:Humans; D007111:Immunity, Cellular; D007136:Immunoglobulins; D007153:Immunologic Deficiency Syndromes / Q000276:immunology; D051379:Mice; D009369:Neoplasms / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology
chemical_list: D007136:Immunoglobulins