Answer :
Final answer:
Autoimmune diseases and transplant rejection are examples of immune system responses that can be harmful.
Explanation:
Autoimmune diseases occur when the immune system mistakenly attacks the body's tissues, leading to various health issues. A classic example is transplant rejection, where the immune system identifies the transplanted organ as foreign and tries to destroy it. This over-reactive response can be harmful and is a result of the immune system failing to recognize 'self' from 'non-self'.
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