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Self recognition immunity is when something goes into the body and it has been there before. The body automatically puts a marker specific to only that substance on it so that anytime it is in contact with the body it will recognize it. Non-recognized immunity is when a foreign substance enters the body. In this case the body has defense teams designed to attack and rid the body of the foreign substance. Sometimes the cells that are supposed to recognize the markers fail to and the body attacks it's own recognied substances. When this happens, this is the cause of many autoimmune diseases such as systemic lupus erythematosus, multiple sclerosis. OMG

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