Answer: Thymosin
Notes: The thymus gland produces the hormone thymosin. Thymosin stimulates the development of T cells, which fight disease. The thymus gland is located in the chest, between the lungs and behind the breastbone. It is active until puberty, after which it shrinks and is replaced by fat. The thymus gland also produces thymopoietin and thymulin. Thymopoietin is a polypeptide hormone made up of 49 amino acids.
