rjuniorhigh
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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.

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randylacayo
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.
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.

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