The protein encoded by this gene is a member of the interleukin 1 cytokine family. This cytokine was shown to specifically inhibit the activation of NF-kappaB induced by interleukin 1 family, member 6 (IL1F6). This gene and eight other interleukin 1 family genes form a cytokine gene cluster on chromosome 2. Synonyms: Polyclonal IL1F5 antibody, Anti-IL1F5 antibody, interleukin 1 family, member 5, delta antibody, FIL1 antibody, FIL1(DELTA) antibody, FIL1D antibody, IL1HY1 antibody, IL1L1 antibody, IL1RP3 antibody, MGC29840 antibody.