Function of cytokines
Cytokines are small molecules. secreted by cells in response to a stimulus. They may have an effect on the cell that produces them and are critical to signaling between cells, with each cytokine often inducing several different biological effects. Many different cells release cytokines, but each cell type releases only certain of these molecules. As a group, cytokines induce growth, differentiation chemotaxis, activation, and/or enhanced cytotoxicity. Moreover, it is not uncommon for some cytokines to have similar activities and for many cytokines, some with poopsing activities, to be released by a particular stimulus. Thus, the resulying biological effect is a factor of the sum of all of these activities.
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