Bursa of Fabricius

In birds, the bursa of Fabricius (Latin: Bursa cloacalis or Bursa fabricii) is the site of hematopoiesis, a specialized organ that, as first demonstrated by Bruce Glick and later by Max Cooper and Robert Good, is necessary for B cell (part of the immune system) development in birds. Mammals generally do not have an equivalent organ; the bone marrow is often both the site of hematopoiesis and B cell development. The bursa is present in the cloaca of birds and is named after Hieronymus Fabricius who described it in 1621.

Read more about Bursa Of FabriciusDescription, Origin of The Name 'B Cells', Research History, Diseases

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Bursa Of Fabricius - Diseases
... Typically, the virus attacks the bursa of young birds, preventing development of the immune system ...