title: Diffusely infiltrated area of lymphoid cells in the cloacal bursa.
mesh_terms: D000818:Animals; D002060:Bursa of Fabricius / Q000166:cytology / Q000276:immunology* / Q000648:ultrastructure; D002642:Chick Embryo; D002645:Chickens; D002988:Cloaca / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology*