Node, one of two points where a body's orbit crosses the ecliptic, called the ascending node (when the body is moving northward) and descending node (when the body is moving southward).
Node, the place on a stem where a leaf is attached.
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One job of the lymph nodes is to clean the lymph by trapping foreign cells, such as bacteria or cancer cells, and identifying foreign proteins for antibody response.
Sentinel lymph node mapping is a technique for pinpointing which node is the most likely to receive the primary drainage from the tumor and therefore the most likely to contain cancer, so that it can be surgically removed and examined under the microscope for cancer.
In 2001, sentinel lymph node mapping is being used primarily in cases of melanoma and breast cancer.
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