title: [An anatomical study on the spleen of archaic fish. 2. Brachiopterygii and chondrostei].
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005399:Fishes / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D013154:Spleen / Q000033:anatomy & histology* / Q000648:ultrastructure