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Patent Pending Cytokines (Greek:Cyto from Greek "κύτταρο" kyttaro "cell" + Kines from Greek "κίνηση" kinisi "movement") are a broad and loose category of small proteins (~5–20 kDa) that are important in cell signaling. They are released by cells and affect the behavior of other cells. Cytokines can also be involved in autocrine signaling.