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The sentinel lymph node is the first lymph node that the lymph ducts drain into.
http://www.cancernews.com
One of the principal functions of lymph nodes is the production of lymphocytes that are directed to the bloodstream to fight infection.
http://ealthlink.mcw.edu
The sentinel lymph node is the first lymph node ("gland") to receive lymphatic drainage from a tumor. It stands sentinel over the tumor, so to speak.
http://www.medicinenet.com