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White blood cells are made in the bone marrow, which is a tissue rather than an organ. Some of the cells mature in the lymph nodes, spleen or thymus.
Wiki User
∙ 8y ago
Wiki User
∙ 14y agoThe bone marrow. That's the reason that patients who get leukaemia (cancer of the blood) need bone marrow transplants when they're finished with chemotherapy.
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