The lymphatic system is one of the body's natural defences against infection. Lymph nodes are found all over the body. The ones that you are most likely to notice are in the neck, armpit and groin. Circulating through the lymphatic vessels is a colourless fluid called lymph, which contains lymphocytes. These are a type of white blood cell and are an essential part of the body's defence against infection and disease.
All lymphocytes originate in the bone marrow as immature cells called stem cells.
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