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A
lymph node is a small bean-shaped structure that forms part of the lymphatic
system. Lymph nodes are found throughout the body, particularly in places
where lymph vessels unite.
The lymph nodes have three main functions: (1) to filter out and destroy
foreign substances, such as bacteria and dust; (2) to produce some of the
white blood cells called lymphocytes; and (3) to produce antibodies to help in
the body's immune system.
Specialized lymphoid tissue, similar to lymph nodes, includes the tonsils,
adenoids, appendix, spleen, and areas of the body such as the Peyer's
patches in the wall of the small intestine.
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