What are cytokines? | Live Science

Cytokines are molecules that allow your cells to talk to each other, and are crucial for healthy immune system function. Too many cytokines, however, can have a negative effect and result in what’s known as a “cytokine storm.”

These small signaling molecules are produced by many different immune cells, such as neutrophils (some of the first cells to travel to an infection site), mast cells (responsible for allergic reactions), macrophages, B-cells and T-cells, according to a 2014 review published in the journal Frontiers in Immunology

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