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All right.
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Here we have an interesting question about the immune system, which is really a beautiful, fascinating complex system, which has some creative methods for dispatching of foreign antigens and our own foreign infected cells, our own infected cells, excuse me, our own cells would not be foreign.
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After they have been recognized by the immune system, described two ways that antigens or infected cells are immobilized or destroyed.
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Okay, well let's start with one example.
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Let's use an antigen that is part of a virus.
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So let me label this virus.
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And the virus will have a part that can be recognized by our body, which would serve as the antigen.
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Say it has these proteins sticking out from its surface.
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And these proteins are what will bind with the cells of the host and allow the virus to actually infect the host cells.
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But the immune system, actually first let me label on the virus, this would be considered the antigen, which would be recognized as foreign or harmful by a molecule of the immune system.
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Let's give it a different shape and label it, antibody.
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So our body produces and the host will produce these antibodies, and the antibody may recognize and bind to the antigen.
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And in doing so, immediately render it harmless...