Answer: Programs T lymphocytes to become regulator or effector T cells.
Explanation:
The thymus gland is found in the upper part of the chest between the lungs and behind the sternum.
Its function is to receive immature T lymphocytes produced by the red bone marrow and program them to become mature regulator or effector T cells which are involved in the immune system's response to foreign cells.
Proteins are the nutritional class which builds and maintains cells and tissues. The type are often called "structural" since they are like the scaffolding of cells and tissues.