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Autoimmunity is a condition in which the immune system mistakenly identifies the body’s own cells, tissues, or organs as foreign and mounts an immune response against them. Under normal circumstances, the immune system can distinguish between self and non-self through a process called self-tolerance, which involves mechanisms such as clonal deletion of self-reactive lymphocytes and regulatory T cell activity. When ________ __________ __________ ____ ______ ____ ___ ________ __________ ______ ____ _________.
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