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Question
How do cytokine barriers provide innate immunity in humans?
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Solution
Cytokines are the small proteins that are released by some cells of the immune system, which activate the cellular components of innate and specific immunity, including macrophages, natural killer cells, B and T lymphocytes, mast cells and many more. Some cytokines, like interferons, are also directly involved in protecting the non-infected cells from viral infection.
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