title: On the evolution of the spleen.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002196:Capillaries; D004920:Erythropoiesis; D006410:Hematopoiesis; D013154:Spleen / Q000033:anatomy & histology* / Q000098:blood supply / Q000196:embryology / Q000502:physiology