Tags: Protein.
Interleukin 2 (IL-2) is an interleukin a type of cytokine signaling molecule in the immune system. It is a protein that regulates the activities of white blood cells (leukocytes often lymphocytes) that are responsible for immunity. IL-2 is part of the body’s natural response to microbial infection and in discriminating between foreign (non-self) and self. IL-2 mediates its effects by binding to IL-2 receptors which are expressed by lymphocytes.