IL-21

IL-21 is a protein, specifically a type of signaling molecule called a cytokine, produced mainly by immune cells. It helps coordinate the body's immune response by encouraging certain cells, like T cells and B cells, to grow, mature, and produce antibodies. This enhances the body's ability to fight infections and cancer. IL-21 also influences inflammation and immune regulation. Overall, it plays a key role in maintaining a balanced and effective immune system, helping the body recognize and eliminate threats while avoiding excessive inflammation.