title: An electron and light microscope study on the caecal tonsil: the basic unit of the caecal tonsil.
mesh_terms: D000818:Animals; D002432:Cecum / Q000648:ultrastructure*; D002645:Chickens; D008214:Lymphocytes / Q000648:ultrastructure; D008221:Lymphoid Tissue / Q000648:ultrastructure; D014066:Palatine Tonsil / Q000648:ultrastructure*