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Answer the question briefly in one two s...

Answer the question briefly in one two sentence:
What is an antigen?

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**Step-by-Step Solution:** 1. **Definition of Antigen**: An antigen is a chemical substance that can stimulate an immune response in the body. 2. **Role in Immune Response**: This immune response typically involves the production of antibodies, which are molecules that help to neutralize or eliminate the antigen. 3. **Nature of Antigens**: Antigens can be proteins, toxins, or other harmful substances that are recognized as foreign by the immune system. ...
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