Enables interleukin-1 receptor binding activity. Involved in several processes, including cellular response to norepinephrine stimulus; chronic inflammatory response to antigenic stimulus; and fever generation. Located in extracellular space. Used to study adult respiratory distress syndrome; anti-basement membrane glomerulonephritis; hypertension; silicosis; and transient cerebral ischemia. Biomarker of encephalitis and pneumonia. Human ortholog(s) of this gene implicated in several diseases, including autoimmune disease (multiple); eye disease (multiple); kidney failure (multiple); lung disease (multiple); and vascular disease (multiple). Orthologous to human IL1RN (interleukin 1 receptor antagonist). [provided by Alliance of Genome Resources, Apr 2022]