Inositol phosphates are important signaling molecules involved in numerous cellular functions. Inositol 1 3-bisphosphate (Ins(1 3)P2) is an intermediate in the inositol phosphate pathway being produced by dephosphorylation of Ins (1 3 4)P3 by type II inositol 1 3 4 trisphosphate 4-phosphatase.