isBiomarkerOfAging disease interleukin interleukin 18 (Homo sapiens) Interleukin-18 (IL18, also known as interferon-gamma inducing factor) is a protein which in humans is encoded by the IL18 gene.[1][2] The protein encoded by this gene is a proinflammatory cytokine. interleukin 18 Helen Parkinson IL-18 http://www.uniprot.org/uniprot/Q14116 http://en.wikipedia.org/wiki/Interleukin_18