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A
Cytokine barriers
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B
Physical barriers
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C
Cellular barriers
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D
Physiological barriers
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A
Answer:
A
Interferons are a type of cytokine, a protein produced and released by host cells in response to the presence of pathogens such as viruses, bacteria, parasites, or tumor cells. They are part of the body's natural defense system, and are produced by cells in response to the presence of pathogens. Interferons help to regulate the immune system by stimulating the production of other cytokines, which in turn activate the immune system to fight off the invading pathogen.
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Lymphatic system
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