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An autoantibody is an antibody made against substances formed by a person's own body. Autoantibodies can directly destroy cells that have the substances on them or can make it easier for other white blood cells to destroy them. Some autoimmune diseases are caused by autoantibodies.
This answer is based of source information from the National Cancer Institute.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.