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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 other immune cells. It provides a microenvironment rich in stromal cells, growth factors, ________ _____ ____ __________ _________.
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