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Interleukin 1 receptor, type I (IL1R1), also known as CD121a (Cluster of Differentiation 121a, is a master regulator of inflammation and innate immunity. When triggered by IL-1beta, IL-1RI aggregates with IL-1R-associated protein (IL-1RAcP) and forms a membrane proximal signalosome that potently activates downstream signaling cascades.1 IL1R1 is expressed predominantly by T cells, fibroblasts, and endothelial cells.