title: The development of immunological reactivity in fetal lambs.
mesh_terms: D000818:Animals; D006388:Hemagglutinins / Q000032:analysis; D007107:Immune System / Q000196:embryology*; D008198:Lymph Nodes / Q000196:embryology / Q000276:immunology; D008208:Lymphatic System / Q000196:embryology*; D008214:Lymphocytes / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D010581:Peyer's Patches / Q000196:embryology; D012756:Sheep / Q000196:embryology* / Q000276:immunology; D013154:Spleen / Q000196:embryology; D013950:Thymus Gland / Q000196:embryology
chemical_list: D006388:Hemagglutinins