title: A comparative study on the bursa Fabricii and tonsilla caecalis in birds.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000166:cytology* / Q000276:immunology; D001717:Birds / Q000033:anatomy & histology*; D002060:Bursa of Fabricius / Q000166:cytology*; D002432:Cecum / Q000166:cytology*; D014066:Palatine Tonsil / Q000166:cytology