Where do T-cells mature?

Where do T-cells mature?

• A. Bone marrow.
• B. Spleen.
• C. Lymph nodes.
• D. Thymus.

Answer: (D)

T-cell maturation happens in the thymus, a primary lymphoid organ. Progenitors arrive from the bone marrow and then undergo a process that includes T cell receptor gene rearrangement, positive selection for recognizing self-MHC, and negative selection to prevent autoimmunity. Those cells that pass these checks exit as mature, naive T cells ready to migrate to peripheral lymphoid tissues and respond when they encounter their specific antigen. The bone marrow is where lymphoid cells originate and where B cells mature, while the spleen and lymph nodes are sites where mature T cells encounter antigens and mount responses, not where they finish developing.

T-cell maturation happens in the thymus, a primary lymphoid organ. Progenitors arrive from the bone marrow and then undergo a process that includes T cell receptor gene rearrangement, positive selection for recognizing self-MHC, and negative selection to prevent autoimmunity. Those cells that pass these checks exit as mature, naive T cells ready to migrate to peripheral lymphoid tissues and respond when they encounter their specific antigen. The bone marrow is where lymphoid cells originate and where B cells mature, while the spleen and lymph nodes are sites where mature T cells encounter antigens and mount responses, not where they finish developing.