title: In vitro approach to development of immune reactivity.
mesh_terms: D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology; D002454:Cell Differentiation; D002478:Cells, Cultured; D004622:Embryo, Mammalian / Q000276:immunology; D006410:Hematopoiesis; D006801:Humans; D007108:Immune Tolerance; D007109:Immunity; D007165:Immunosuppression Therapy; D008264:Macrophages / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology