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A glandular sac opening into the cloaca of a bird, producing B cells.
- ‘These drugs prevent development of the bursa of Fabricius and so selectively reduce humoral immunocompetence without influencing macrophages or cell-mediated immunity.’
- ‘Males with large badges have a smaller bursa of Fabricius than do average males.’
- ‘Birds that possessed a bursa of Fabricius were classified as young birds in their second or third calendar year.’
- ‘Measurements of immunological structure include peripheral white blood cell counts and the mass and cellularity of immune organs such as the thymus, spleen, and bursa of Fabricius.’
- ‘In birds, the thymus and bursa of Fabricius are the sites of maturation of T and B lymphocytes, respectively.’
Mid 19th century (in the Latin form bursa Fabricii): from bursa, and a Latinized form of the name of Girolama Fabrici (1533–1619), Italian anatomist.
bursa of Fabricius/ˌbərsə əv fəˈbriSH(ē)əs/
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