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    GlossaryAutoantibodies

    immune proteins mistakenly attacking body's own tissues

    Autoantibodies are immune system proteins that mistakenly target and attack the body's own tissues, rather than foreign invaders like bacteria or viruses. This can lead to autoimmune diseases, where the body's immune response causes damage to its own cells and organs. For example, in alopecia areata, autoantibodies attack hair follicles, leading to hair loss.

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