Interleukin 36 beta (IL-36 beta), also known as IL-1F8, FIL-1h and IL-1H2, is a member of the IL-1 family of proteins. IL-36 beta is reported to be actively secreted. Cells expressing IL-36 beta include resting and activated monocytes, and B cells. The receptor for IL-36 beta is thought to be a combination of IL-1 Rrp2 and IL-1 RAcP. Recombinant IL-36 beta activates pathways involving NF-kB and MAPK in an IL-1 Rrp2-dependent manner.