Question:

Name the chemical messenger that activates Natural Killer T-cells and macrophages.

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Interferons represent a "cytokine barrier" in innate immunity.
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Solution and Explanation

Step 1: Understanding the Concept:
Cells of the immune system communicate through chemical signals.

Step 2: Detailed Explanation:
Interferons are a class of cytokines released by virus-infected cells.
They act as chemical messengers that activate other immune cells like Natural Killer (NK) cells and Macrophages to destroy infected cells and pathogens.

Step 3: Final Answer:
The messengers are Cytokines, specifically Interferons.
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