<prompt> All of the following are pyrogenic cytokines, Except-Interleuken 18 IL-18Interleuken 6 IL-6Tumor Necrosis Factor TNFInterferon a IFN-a  <response>: Ans. is a i.e., Interleukin 18 IL-18 Interleukin 18 is not a pyrogenic cytokine. 