It is untrue that B-cell maturation takes place in the thymus gland. The thymus gland is where T-cell development takes place.
During childhood, the thymus gland is most active. T-cell production in your thymus actually begins before birth. By the time you reach adolescence, you have all the T-cells you require since it continues to produce them. Your thymus gland gradually shrinks and is replaced by fat after puberty.
Lymphoid progenitors that originated from hematopoietic stem cells in the bone marrow move to the thymus to finish developing into functional T cells without the need for an antigen. T cells mature in the thymus.
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