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자기면역의 질병은 면역 체계가 자신의 세포를 공격할 때 발생합니다.jagimyeon-eug-ui jilbyeong-eun myeon-yeok chaegye-ga jasin-ui sepo-reul gong-gyeokhal ttae balsaenghamnida.Autoimmune diseases occur when the immune system attacks its own cells.