Are lymphocytes produced in the bone marrow and then migrate to the thymus gland and lymph nodes where they develop? Are some lymphocytes also produced in the lymph nodes?
B and T lymphocytes are produced in Bone marrow which is primary lymphoid organs and they get matured here,
Then they migrate to secondary lymphoid organs like lymph nodes , tonsils , spleen etc where they become functional and proliferate to different parts of the body.
But T cells Get matured in Thymus and then migrate to secondary lymphoid organs for differentiating ( becomes functional )