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The bursa of Fabricius is a lymphoid organ found in birds that opens into the cloaca. Its primary function is in the production of B cells, which are crucial for the immune system.1

In contrast, bursae in mammals are small sacs located between tendons, muscles, or skin and bony areas. These mammalian bursae act as cushions to reduce friction and stress. They are classified into types such as adventitious, subcutaneous, synovial, and submuscular, and can become inflamed, a condition known as bursitis.2

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  1. bursa of Fabricius
  2. bursa

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