Immunogen sequence: EEEVKKEADP GETPSEAPSE ARTTPAENGV NHTTTLTPKP PSQALHSQPA PGSVKAPAKT EDLIQSVLTE VEAQTIEELK QQKSFVK. The protein encoded by this gene catalyzes the formation of inositol 1,4,5-trisphosphate and diacylglycerol from phosphatidylinositol 4,5