T - cells mature in?
Ans is 'c' i.e., Thymus o T cell precursors arise in bone marrow (also in yolk sac & liver before birth) and migrate to the thymus. Maturity of T-cells takes place in the thymus (So, T cells arise in bone marrow and mature in thymus).o B cells originate as well as mature in bone marrow.
Bone marrow
Liver
Thymus
Lymph nodes
Cells and Tissues of Immune System