Where are B-and T-lymphocytes formed and mature in human body ? Also mention the site of formation of R.B.Cs in the foetus and after birth.

Explanation

B-lymphocytes and T-lymphocytes are produced in the bone marrow and thymus respectively , and mature in spleen and lymph nodes.
R.B.Cs formation occurs in the liver and spleen in the foetus and in the red bone marrow after birth .