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What does the immune system remind you of? What is it similar to when you think about the world around you? -- Explain your reasoning, defend your answer.

User Adaleni
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The immune system recognizes and destroys, or tries to destroy, substances that contain antigens. Your body's cells have proteins that are antigens. These include a group of antigens called HLA antigens. Your immune system learns to see these antigens as normal and usually does not react against them.
User Alessandro Annini
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The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins.
User Econ
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