Bursa of fabricius as site of origin of germinal centre cells.
D000818:Animals; D000917:Antibody Formation; D002004:Brucella Vaccine; D002060:Bursa of Fabricius / Q000166:cytology / Q000276:immunology*; D002645:Chickens; D007111:Immunity, Cellular / Q000528:radiation effects; D007114:Immunization; D007156:Immunologic Memory; D011830:Radiation Effects; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013950:Thymus Gland / Q000166:cytology / Q000276:immunology; D014316:Tritium
D002004:Brucella Vaccine; D014316:Tritium