The response of the immune system is first triggered by the presence of:

Name: The response of the immune system is first triggered by the presence of:
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The immune response is triggered by the presence of antigens. Antigens are molecules that are typically foreign to the body, such as from viruses or bacteria, and are recognized by the immune system as a potential threat. This recognition of antigens triggers an immune response, which includes the production of antibodies to neutralize the antigens.

The Response of the Immune System Is First Triggered by the Presence