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IP3R1 (inositol 1,4,5-triphosphate receptor type 1) is an intracellular calcium release channel that mediates calcium release from the endoplasmic reticulum. There are 3 mammalian InsP3R receptors: Insp3R1, Insp3R2, and Insp3R3. Defects in the gene which encodes InsP3R1, ITPR1, are the cause of spinocerebellar ataxia type 15 (SCA15).