Stages in the development of the ovine immune system.
D000818:Animals; D000831:Animals, Newborn; D006413:Hematopoietic System / Q000033:anatomy & histology / Q000196:embryology / Q000276:immunology; D008208:Lymphatic System / Q000033:anatomy & histology / Q000196:embryology* / Q000276:immunology; D012756:Sheep / Q000033:anatomy & histology* / Q000276:immunology