blk_256187719Level 4

Haematopoietic system

**Definition:** Lymphocytes include natural killer cells (which function in cell-mediated, cytotoxic innate immunity), T cells (for cell-mediated, cytotoxic adaptive immunity), and B cells (for humoral, antibody-driven adaptive immunity).

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XA5869Haematopoietic stem cells

XA8EC5Blood

XA9XK1Bone marrow

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