SEARCH Articles Figures Tables 1,6-bisphosphate Phosphatidylinositol Phosphatidylinositol bisphosphate (PIP Phosphatidylinositol bisphosphate , second messenger system Phosphatidylinositol bisphosphate, hydrolysis Phosphatidylinositol-4,5-bisphosphate 3-kinase pathway Products of phosphatidylinositol 4,5-bisphosphate hydrolysis and their roles as second messengers in the cell