interleukin

interleukin One of several similar protein substances that serve as signaling molecules within the body. Interleukins can be produced by a variety of different cells within the body and can be thought of as chemical messengers that help regulate the actions of the immune system. Abbreviated IL. They may be used in biological therapy to stimulate the growth and activities of certain kinds of white blood cells that are involved in immune response. Numerous different ILs have been identified.