The substrate solution used for assaying lipid kinases.

Formulation: Frozen substrate solution containing 0.125 mM of Phosphatidylinositol 4,5-biphosphate [PI(4,5)P2 or PtdIns(4,5)P] and 1 mM of Phosphatidylserine (PS) in 1X lipid dilution buffer

For optimal storage, aliquot diluted product into smaller quantities and store at recommended temperature. For most favorable performance, avoid repeated handling and multiple freeze/thaw cycles.