Thymus Essentials. 1  The thymus gland, located behind your sternum and between your lungs, is only active until puberty. 2  After puberty, the thymus starts to slowly shrink and become replaced by fat. 3  Thymosin is the hormone of the thymus, and it stimulates the development of disease-fighting T cells.
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1 A+ credit converts to 1 Rapid Rewards credit. 16 A+ credits can be used to fly two oneways on Airtran, and 16 Rapid Rewards credits can be used to fly two oneways on Southwest. Joanneâs situation is that she has one Rapid Rewards credit and 55,000 Rapid Rewards points.