Definition of cytokine
: any of a class of immunoregulatory proteins (such as interleukin or interferon) that are secreted by cells especially of the immune system Most cytokines are produced primarily in the presence of disease or immunization and contribute to immune responses, inflammation, and endothelial cell activation; others are involved in tissue repair.— Charles A. Dinarello et al. The proinflammatory cytokine interleukin-2 determines the magnitude and duration of the T-cell response immediately after antigen encounter and assists in the maturation of macrophages and the proliferation of B cells and natural killer cells …— Chiea C. Khor et al.
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