Does baby brain really exist? Answers from Myra Wick, M.D., Ph.D. There isn't enough information to support the existence of baby brain or pregnancy brain â terms used to describe the idea that pregnancy or early motherhood can harm a woman's memory and ability to think.
What two sites are involved in the production and maturation of T lymphocytes? What hormone is secreted by the thymus and stimulates the maturation of lymphocytes into T cells? Thymosin (THIGH-moh-sin) is secreted by the thymus and effects the  maturation of T-cells.
B-cells, like other white blood cells, are created in the bone marrow from stem cells. After maturation, B-cells are present in your blood and in your lymph nodes. Thre are two main types of lymphocytes, T-cells, and B-cells. When you have a CBC blood test done, the number and percentage of lymphocytes are reported, but there is no differentiation as to which are T-cells and which are B-cells.