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Primary lymphoid organs are specialized sites where lymphocytes develop and mature, forming the foundation of the adaptive immune system. The two main primary lymphoid organs are the bone marrow and the thymus. Bone marrow serves as the site of origin for all blood cells, including B lymphocytes, T lymphocyte precursors, and __________ __________ _____ _________ ________ __________ ____ ____ _______.
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