an antibody that an organism produces against any of its own tissues, cells, or cell components.
noun (pl) -bodies
an antibody reacting with an antigen that is a part of the organism in which the antibody is formed

autoantibody au·to·an·ti·bod·y (ô’tō-ān’tĭ-bŏd’ē)
An antibody that attacks the cells and tissues of the organism in which it was formed.
An antibody that reacts with the cells, tissues, or native proteins of the individual in which it is produced. Autoimmune diseases are caused by the presence of autoantibodies.


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