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Lymph nodes are small, bean-shaped structures that are an integral part of the lymphatic system, which plays a critical role in the body’s immune defense. They are distributed throughout the body, commonly found in the neck, armpits, groin, and abdomen, and act as filters for lymph, the fluid that circulates through lymphatic vessels carrying immune cells, waste, and foreign particles. Structurally, a _______ _________ _______ _________ ____ ___ _____ __________ ________ _______.
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