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Lymphoma. Light micrograph of a section through lung tissue showing numerous lymphocytes (a type of white blood cell, blue nuclei) in lymphoma (cancer of the lymph tissue). The lymphatic system is a network of nodes (glands) and ducts that carry lymph fluid around the body. Lymph nodes produce lymphocytes to help fight infections, but lymphoma causes lymphocyte proliferation, although the cells are not fully functional and the immune system is severely compromised. This leads to susceptibility to opportunistic infections, which may be fatal. Anti-cancer drugs, radiotherapy or bone marrow transplants may prolong life. Magnification unknown.
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