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Autoimmune diseases arise when the immune system mistakenly targets the body’s own cells, tissues, or organs, leading to chronic inflammation and tissue damage. The causes of autoimmune diseases are multifactorial, involving genetic, environmental, and immunological factors. Genetically, certain human leukocyte ___ ______ ______ ________ ______ ________ ____ ______ _____ _____ ________.
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