title: Anatomy of the immune system.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology; D001853:Bone Marrow / Q000033:anatomy & histology; D002060:Bursa of Fabricius / Q000033:anatomy & histology; D002450:Cell Communication; D002454:Cell Differentiation; D002465:Cell Movement; D004064:Digestive System / Q000033:anatomy & histology; D006801:Humans; D008198:Lymph Nodes / Q000033:anatomy & histology; D008214:Lymphocytes / Q000166:cytology / Q000648:ultrastructure; D008221:Lymphoid Tissue / Q000033:anatomy & histology* / Q000276:immunology; D008264:Macrophages / Q000166:cytology; D009000:Monocytes / Q000166:cytology; D010586:Phagocytes / Q000166:cytology; D010950:Plasma Cells / Q000166:cytology; D012137:Respiratory System / Q000033:anatomy & histology; D013154:Spleen / Q000033:anatomy & histology; D013601:T-Lymphocytes / Q000166:cytology; D013950:Thymus Gland / Q000033:anatomy & histology