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[Free Registration/Login may be required to access all resource tools.] The immune system usually protects you from pathogens and other causes of disease. When the immune system is working properly, it keeps you from getting sick. But the immune system is like any other system of the body. It can break down or develop diseases. Learn more about autoimmune diseases in this learning module produced by CK-12.
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- Knovation Readability Score: 2 (1 low difficulty, 5 high difficulty)