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.
The thymus, a specialized organ of the immune system, is primarily responsible for the T cellâs maturation. There are six types of T-cells, namely: Helper T-cells, Cytotoxic T-cells, Memory T-cells, Regulatory T-cells, Natural Killer T-cells (NKT) and Gamma Delta T-cells. B-cells, on the other hand, play a principal role in humoral immunity (with antibody involvement).