IMM250H1 Chapter Notes - Chapter 4: Lymphopoiesis, Hematopoietic Stem Cell, Thymus

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E ector functions/mechanisms for adaptive system - response that results in destroying pathogens: Common lymphoid progenitor cells - where lymphocytes develop: hematopoietic stem cells found in bone marrow di erentiate into common lymphoid progenitor cells. Primary lymphoid organs - site where lymphocytes mature from precursor cells: b cells - mature in bone marrow, t cells - mature in thymus gland. Secondary lymphoid tissue - site where lymphocyte is activated by antigens: lymph nodes, spleen, mucosa-associated and skin-associated lymphoid tissue. Die by apoptosis - unwanted cells broken down + non-in ammatory. Common lymphoid progenitors constantly develop new lymphocyte precursors. Maintains homeostasis of amount of naive lymphocytes in blood. 4. 3 recognition and response by b cells and t cells: a division of labour. 4. 3. 1 antigen recognition by b cells and t cells: antigen receptors. Bcrs and tcrs (t cell and b cell receptors) - transmembrane proteins that send recognition signals when bound to speci c antigen: bcr (immunoglobulin)

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