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What is the difference between an antigen and an antibody?

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Antigens are substances that provoke an immune response (they're the ultimate target for the immune system). Antibodies are simply proteins that are secreted as a result of the antigen provoked immune response. In short, antigens cause the disease and antibodies cure it.
First answer by Scoffron. Last edit by Nikiani17. Contributor trust: 3 [recommend contributor recommended]. Question popularity: 36 [recommend question].