T cells that react against the body's own antigens instead of foreign antigens:

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Most T cells that react against the body's own antigens are eliminated from the body during the involution of the thymus gland that occurs in early childhood. Those that remain are hypothesized to be a cause of autoimmune illnesses, such as systemic lupus erythematosis, myasthenia gravis, or type 1 diabetes mellitus. Immunoglobulins are made by B lymphocytes or plasma cells, not T cells. The cause of the acquired immunodeficiency syndrome is the human immunodeficiency virus, a virus that attacks T helper cells, a type of T cell that helps stimulate cell-mediated immune responses.

T Cells That React Against the Body's Own Antigens Instead