- a type of small protein, as interferon, secreted by certain cells, especially immune cells, that helps regulate the body’s immune response to inflammation and disease:Cytokines are like the body’s messenger system for mobilizing its response to pathogens. The largest group of cytokines that stimulate immune cell proliferation are the interleukins.
- any of various proteins, secreted by cells, that carry signals to neighbouring cells. Cytokines include interferon
