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The Thymus is a ductless two-lobed gland lying behind the breast bone and composed mainly of lymphoid cells. It plays a part in setting up the body's immunity system. After puberty, it declines in size.

Autoimmune difficulties are thought to be caused by an improperly functioning thymus. A type of cancer called Lymphoma can arise from the thymus gland


The New American Desk Encyclopedia, Penguin Group, 1989